Log in

Relevant bibliographies by topics / Carbon flux attenuation / Journal articles

To see the other types of publications on this topic, follow the link: Carbon flux attenuation.

Journal articles on the topic 'Carbon flux attenuation'

Author: Grafiati

Published: 31 May 2025

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Carbon flux attenuation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Engel, Anja, Hannes Wagner, Frédéric A. C. Le Moigne, and Samuel T. Wilson. "Particle export fluxes to the oxygen minimum zone of the eastern tropical North Atlantic." Biogeosciences 14, no. 7 (2017): 1825–38. http://dx.doi.org/10.5194/bg-14-1825-2017.

Full text

Abstract:

Abstract. In the ocean, sinking of particulate organic matter (POM) drives carbon export from the euphotic zone and supplies nutrition to mesopelagic communities, the feeding and degradation activities of which in turn lead to export flux attenuation. Oxygen (O2) minimum zones (OMZs) with suboxic water layers (< 5 µmol O2 kg−1) show a lower carbon flux attenuation compared to well-oxygenated waters (> 100 µmol O2 kg−1), supposedly due to reduced heterotrophic activity. This study focuses on sinking particle fluxes through hypoxic mesopelagic waters (< 60 µmol O2 kg−1); these represent

APA, Harvard, Vancouver, ISO, and other styles

2

Estapa, M. L., K. Buesseler, E. Boss, and G. Gerbi. "Autonomous, high-resolution observations of particle flux in the oligotrophic ocean." Biogeosciences 10, no. 8 (2013): 5517–31. http://dx.doi.org/10.5194/bg-10-5517-2013.

Full text

Abstract:

Abstract. Observational gaps limit our understanding of particle flux attenuation through the upper mesopelagic because available measurements (sediment traps and radiochemical tracers) have limited temporal resolution, are labor-intensive, and require ship support. Here, we conceptually evaluate an autonomous, optical proxy-based method for high-resolution observations of particle flux. We present four continuous records of particle flux collected with autonomous profiling floats in the western Sargasso Sea and the subtropical North Pacific, as well as one shorter record of depth-resolved par

APA, Harvard, Vancouver, ISO, and other styles

3

Estapa, M. L., K. Buesseler, E. Boss, and G. Gerbi. "Autonomous, high-resolution observations of particle flux in the oligotrophic ocean." Biogeosciences Discussions 10, no. 1 (2013): 1229–65. http://dx.doi.org/10.5194/bgd-10-1229-2013.

Full text

Abstract:

Abstract. Observational gaps limit our understanding of particle flux attenuation through the upper mesopelagic because available measurements (sediment traps and radiochemical tracers) have limited temporal resolution, are labor-intensive, and require ship support. Here, we conceptually evaluate an autonomous, optical proxy-based method for high-resolution observations of particle flux. We present four continuous records of particle flux collected with autonomous, profiling floats in the western Sargasso Sea and the subtropical North Pacific, as well as one shorter record of depth-resolved pa

APA, Harvard, Vancouver, ISO, and other styles

4

Boese, Sven, Martin Jung, Nuno Carvalhais, Adriaan J. Teuling, and Markus Reichstein. "Carbon–water flux coupling under progressive drought." Biogeosciences 16, no. 13 (2019): 2557–72. http://dx.doi.org/10.5194/bg-16-2557-2019.

Full text

Abstract:

Abstract. Water-use efficiency (WUE), defined as the ratio of carbon assimilation over evapotranspiration (ET), is a key metric to assess ecosystem functioning in response to environmental conditions. It remains unclear which factors control this ratio during periods of extended water limitation. Here, we used dry-down events occurring at eddy-covariance flux tower sites in the FLUXNET database as natural experiments to assess if and how decreasing soil-water availability modifies WUE at ecosystem scale. WUE models were evaluated by their performance to predict ET from both the gross primary p

APA, Harvard, Vancouver, ISO, and other styles

5

Marsay, Chris M., Richard J. Sanders, Stephanie A. Henson, Katsiaryna Pabortsava, Eric P. Achterberg, and Richard S. Lampitt. "Attenuation of sinking particulate organic carbon flux through the mesopelagic ocean." Proceedings of the National Academy of Sciences 112, no. 4 (2015): 1089–94. http://dx.doi.org/10.1073/pnas.1415311112.

Full text

Abstract:

The biological carbon pump, which transports particulate organic carbon (POC) from the surface to the deep ocean, plays an important role in regulating atmospheric carbon dioxide (CO2) concentrations. We know very little about geographical variability in the remineralization depth of this sinking material and less about what controls such variability. Here we present previously unpublished profiles of mesopelagic POC flux derived from neutrally buoyant sediment traps deployed in the North Atlantic, from which we calculate the remineralization length scale for each site. Combining these results

APA, Harvard, Vancouver, ISO, and other styles

6

Jónasdóttir, Sigrún Huld, André W. Visser, Katherine Richardson, and Michael R. Heath. "Seasonal copepod lipid pump promotes carbon sequestration in the deep North Atlantic." Proceedings of the National Academy of Sciences 112, no. 39 (2015): 12122–26. http://dx.doi.org/10.1073/pnas.1512110112.

Full text

Abstract:

Estimates of carbon flux to the deep oceans are essential for our understanding of global carbon budgets. Sinking of detrital material (“biological pump”) is usually thought to be the main biological component of this flux. Here, we identify an additional biological mechanism, the seasonal “lipid pump,” which is highly efficient at sequestering carbon into the deep ocean. It involves the vertical transport and metabolism of carbon rich lipids by overwintering zooplankton. We show that one species, the copepod Calanus finmarchicus overwintering in the North Atlantic, sequesters an amount of car

APA, Harvard, Vancouver, ISO, and other styles

7

Fischer, Gerhard, Oscar E. Romero, Johannes Karstensen, et al. "Seasonal flux patterns and carbon transport from low-oxygen eddies at the Cape Verde Ocean Observatory: lessons learned from a time series sediment trap study (2009–2016)." Biogeosciences 18, no. 24 (2021): 6479–500. http://dx.doi.org/10.5194/bg-18-6479-2021.

Full text

Abstract:

Abstract. Mesoscale eddies are abundant in the eastern tropical North Atlantic and act as oases for phytoplankton growth due to local enrichment of nutrients in otherwise oligotrophic waters. It is not clear whether these eddies can efficiently transfer organic carbon and other flux components to depth and if they are important for the marine carbon budget. Due to their transient and regionally restricted nature, measurements of eddies' contribution to bathypelagic particle flux are difficult to obtain. Rare observations of export flux associated with low-oxygen eddies have suggested efficient

APA, Harvard, Vancouver, ISO, and other styles

8

Belcher, Anna, Morten Iversen, Sarah Giering, et al. "Depth-resolved particle-associated microbial respiration in the northeast Atlantic." Biogeosciences 13, no. 17 (2016): 4927–43. http://dx.doi.org/10.5194/bg-13-4927-2016.

Full text

Abstract:

Abstract. Atmospheric levels of carbon dioxide are tightly linked to the depth at which sinking particulate organic carbon (POC) is remineralised in the ocean. Rapid attenuation of downward POC flux typically occurs in the upper mesopelagic (top few hundred metres of the water column), with much slower loss rates deeper in the ocean. Currently, we lack understanding of the processes that drive POC attenuation, resulting in large uncertainties in the mesopelagic carbon budget. Attempts to balance the POC supply to the mesopelagic with respiration by zooplankton and microbes rarely succeed. Wher

APA, Harvard, Vancouver, ISO, and other styles

9

Roullier, F., L. Berline, L. Guidi, et al. "Particle size distribution and estimated carbon flux across the Arabian Sea oxygen minimum zone." Biogeosciences 11, no. 16 (2014): 4541–57. http://dx.doi.org/10.5194/bg-11-4541-2014.

Full text

Abstract:

Abstract. The goal of the Arabian Sea section of the TARA oceans expedition was to study large particulate matter (LPM > 100 μm) distributions and possible impact of associated midwater biological processes on vertical carbon export through the oxygen minimum zone (OMZ) of this region. We propose that observed spatial patterns in LPM distribution resulted from the timing and location of surface phytoplankton bloom, lateral transport, microbial processes in the core of the OMZ, and enhanced biological processes mediated by bacteria and zooplankton at the lower oxycline. Indeed, satellite-der

APA, Harvard, Vancouver, ISO, and other styles

10

Suessle, Philipp, Jan Taucher, Silvan Urs Goldenberg, et al. "Particle fluxes by subtropical pelagic communities under ocean alkalinity enhancement." Biogeosciences 22, no. 1 (2025): 71–86. https://doi.org/10.5194/bg-22-71-2025.

Full text

Abstract:

Abstract. Ocean alkalinity enhancement (OAE) has been proposed as a carbon dioxide removal technology (CDR), allowing for long-term storage of carbon dioxide in the ocean. By changing the carbonate speciation in seawater, OAE may potentially alter marine ecosystems with implications for the biological carbon pump. Using mesocosms in the subtropical North Atlantic, we provide first empirical insights into impacts of carbonate-based OAE on the vertical flux and attenuation of sinking particles in an oligotrophic plankton community. We enhanced total alkalinity (TA) in increments of 300 µmol kg−1

APA, Harvard, Vancouver, ISO, and other styles

11

Gubarev, V., M. Krivokorytov, J. A. Ramirez Benavides, et al. "InSn plasma penetration through protective single-walled carbon nanotube-based membranes." Applied Physics Letters 121, no. 14 (2022): 141901. http://dx.doi.org/10.1063/5.0097517.

Full text

Abstract:

Laser-produced plasma sources of short-wavelength (1–20-nm) radiation are actively used nowadays in numerous applications, including water-window microscopy and extreme ultra-violet lithography. Suppression of laser-plasma debris (responsible for damaging optics) is crucial for the lifetime prolongation of optical systems operated with the short-wavelength radiation. Here, we examine the capability of single-walled carbon nanotube (SWCNT)-based membranes to decrease an InSn plasma flux containing both ions and atoms. Faraday cup measurements show that 40- and 90-nm-thick SWCNT membranes reduce

APA, Harvard, Vancouver, ISO, and other styles

12

Mouw, Colleen B., Audrey Barnett, Galen A. McKinley, Lucas Gloege, and Darren Pilcher. "Global ocean particulate organic carbon flux merged with satellite parameters." Earth System Science Data 8, no. 2 (2016): 531–41. http://dx.doi.org/10.5194/essd-8-531-2016.

Full text

Abstract:

Abstract. Particulate organic carbon (POC) flux estimated from POC concentration observations from sediment traps and 234Th are compiled across the global ocean. The compilation includes six time series locations: CARIACO, K2, OSP, BATS, OFP, and HOT. Efficiency of the biological pump of carbon to the deep ocean depends largely on biologically mediated export of carbon from the surface ocean and its remineralization with depth; thus biologically related parameters able to be estimated from satellite observations were merged at the POC observation sites. Satellite parameters include net primary

APA, Harvard, Vancouver, ISO, and other styles

13

Rembauville, M., I. Salter, N. Leblond, A. Gueneugues, and S. Blain. "Export fluxes in a naturally fertilized area of the Southern Ocean, the Kerguelen Plateau: seasonal dynamic reveals long lags and strong attenuation of particulate organic carbon flux (Part 1)." Biogeosciences Discussions 11, no. 12 (2014): 17043–87. http://dx.doi.org/10.5194/bgd-11-17043-2014.

Full text

Abstract:

Abstract. A sediment trap moored in the naturally iron-fertilized Kerguelen plateau in the Southern Ocean provided an annual record of particulate organic carbon and nitrogen fluxes at 289 m. At the trap deployment depth current speeds were low (∼10 cm s−1) and primarily tidal-driven (M2 tidal component) providing favorable hydrodynamic conditions for the collection of flux. Particulate organic carbon (POC) flux was generally low (<0.5 mmol m−2 d−1) although two episodic export events (<14 days) of 1.5 mmol m−2 d−1 were recorded. These increases in flux occurred with a 1 month time lag f

APA, Harvard, Vancouver, ISO, and other styles

14

Jiao, N., Y. Zhang, K. Zhou, et al. "Why productive upwelling areas are often sources rather than sinks of CO<sub>2</sub>? – a comparative study on eddy upwellings in the South China Sea." Biogeosciences Discussions 10, no. 8 (2013): 13399–426. http://dx.doi.org/10.5194/bgd-10-13399-2013.

Full text

Abstract:

Abstract. Marine upwelling regions are known to be productive in carbon fixation and thus thought to be sinks of CO2, whereas many upwelling areas in the ocean are actually sources rather than sinks of CO2. To address this paradox, multiple biogeochemical parameters were investigated at two cyclonic-eddy-induced upwelling sites CE1 and CE2 in the western South China Sea. The results showed that upwelling can exert significant influences on biological activities in the euphotic zone and can either increase or decrease particulate organic carbon (POC) export flux depending on upwelling condition

APA, Harvard, Vancouver, ISO, and other styles

15

Jiao, N., Y. Zhang, K. Zhou, et al. "Revisiting the CO<sub>2</sub> "source" problem in upwelling areas – a comparative study on eddy upwellings in the South China Sea." Biogeosciences 11, no. 9 (2014): 2465–75. http://dx.doi.org/10.5194/bg-11-2465-2014.

Full text

Abstract:

Abstract. The causes for a productive upwelling region to be a source of CO2 are usually referred to the excess CO2 supplied via upwelling of high dissolved inorganic carbon (DIC) from deep water. Furthermore, we hypothesize that microbial activity plays a significant role on top of that. To test this hypothesis, multiple biogeochemical parameters were investigated at two cyclonic-eddy-induced upwelling sites, CE1 and CE2, in the western South China Sea. The data showed that upwelling can exert significant influences on biological activities in the euphotic zone and can also impact on particul

APA, Harvard, Vancouver, ISO, and other styles

16

Roullier, F., L. Berline, L. Guidi, et al. "Particles size distribution and carbon flux across the Arabian Sea Oxygen Minimum Zone." Biogeosciences Discussions 10, no. 12 (2013): 19271–309. http://dx.doi.org/10.5194/bgd-10-19271-2013.

Full text

Abstract:

Abstract. The goal of the Arabian Sea section of the TARA oceans expedition was to study Large Particulate Matter (LPM > 100 μm) distributions and possible impact of associated midwater biological processes on vertical carbon export through the Oxygen Minimum Zone (OMZ) of this region. We found that spatial patterns in LPM distribution resulted from the timing and location of surface phytoplankton bloom, lateral transport, microbial processes in the core of the OMZ, and zooplankton activity at the lower oxycline. Indeed, satellite-derived net primary production maps showed that the northern

APA, Harvard, Vancouver, ISO, and other styles

17

Mogildea, Marian, George Mogildea, Sorin I. Zgura, et al. "A New Method for Tungsten Oxide Nanopowder Deposition on Carbon-Fiber-Reinforced Polymer Composites for X-ray Attenuation." Nanomaterials 13, no. 23 (2023): 3071. http://dx.doi.org/10.3390/nano13233071.

Full text

Abstract:

A new method for the synthesis and deposition of tungsten oxide nanopowders directly on the surface of a carbon-fiber-reinforced polymer composite (CFRP) is presented. The CFRP was chosen because this material has very good thermal and mechanical properties and chemical resistance. Also, CFRPs have low melting points and are transparent under ionized radiation. The synthesis is based on the direct interaction between high-power-density microwaves and metallic wires to generate a high-temperature plasma in an oxygen-containing atmosphere, which afterward condenses as metallic oxide nanoparticle

APA, Harvard, Vancouver, ISO, and other styles

18

Berry, Karin A. T., and David L. Burton. "Natural attenuation of diesel fuel in heavy clay soil." Canadian Journal of Soil Science 77, no. 3 (1997): 469–77. http://dx.doi.org/10.4141/s95-061.

Full text

Abstract:

Petroleum hydrocarbons in the extractable fraction decreased rapidly in a heavy clay soil contaminated with diesel fuel at 5000 mg kg−1 demonstrating natural attenuation. Natural attenuation rates for untilled soil were estimated using two distinct extraction and analysis methods, the Oil & Grease Content (O&G) (US EPA 418.1; ASTM D 95) and extractable organics (EO) (EPA 3520B; EPA 8000A). The time to 50% decrease (t1/2) in the fraction varied with extraction method, Oil & Grease Content (11 d) and Extractable Organics (26 d). Complete attenuation appeared to have occurred after 74

APA, Harvard, Vancouver, ISO, and other styles

19

Frigstad, H., S. A. Henson, S. E. Hartman, et al. "Links between surface productivity and deep ocean particle flux at the Porcupine Abyssal Plain (PAP) sustained observatory." Biogeosciences Discussions 12, no. 7 (2015): 5169–99. http://dx.doi.org/10.5194/bgd-12-5169-2015.

Full text

Abstract:

Abstract. In this study we present hydrography, biogeochemistry and sediment trap observations between 2003 and 2012 at Porcupine Abyssal Plain (PAP) sustained observatory in the northeast Atlantic. The time series is valuable as it allows for investigation of the link between surface productivity and deep ocean carbon flux. The region is a perennial sink for CO2, with an average uptake of around 1.5 mmol m−2 d−1. The average monthly drawdowns of inorganic carbon and nitrogen were used to quantify the net community production (NCP) and new production, respectively. Seasonal NCP and new product

APA, Harvard, Vancouver, ISO, and other styles

20

Frigstad, H., S. A. Henson, S. E. Hartman, et al. "Links between surface productivity and deep ocean particle flux at the Porcupine Abyssal Plain sustained observatory." Biogeosciences 12, no. 19 (2015): 5885–97. http://dx.doi.org/10.5194/bg-12-5885-2015.

Full text

Abstract:

Abstract. In this study we present hydrography, biogeochemistry and sediment trap observations between 2003 and 2012 at Porcupine Abyssal Plain (PAP) sustained observatory in the Northeast Atlantic. The time series is valuable as it allows for investigation of the link between surface productivity and deep ocean carbon flux. The region is a perennial sink for CO2, with an average uptake of around 1.5 mmol m−2 day−1. The average monthly drawdowns of inorganic carbon and nitrogen were used to quantify the net community production (NCP) and new production. Seasonal NCP and new production were fou

APA, Harvard, Vancouver, ISO, and other styles

21

Rembauville, Mathieu, Stéphane Blain, Clara Manno, et al. "The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean." Biogeosciences 15, no. 10 (2018): 3071–84. http://dx.doi.org/10.5194/bg-15-3071-2018.

Full text

Abstract:

Abstract. Natural iron fertilization downstream of Southern Ocean island plateaus supports large phytoplankton blooms and promotes carbon export from the mixed layer. In addition to sequestering atmospheric CO2, the biological carbon pump also supplies organic matter (OM) to deep-ocean ecosystems. Although the total flux of OM arriving at the seafloor sets the energy input to the system, the chemical nature of OM is also of significance. However, a quantitative framework linking ecological flux vectors to OM composition is currently lacking. In the present study we report the lipid composition

APA, Harvard, Vancouver, ISO, and other styles

22

Frigstad, H., S. A. Henson, S. E. Hartman, et al. "Links between surface productivity and deep ocean particle flux at the Porcupine Abyssal Plain sustained observatory." Biogeosciences 12 (October 15, 2015): 5885–97. https://doi.org/10.5194/bg-12-5885-2015.

Full text

Abstract:

In this study we present hydrography, biogeochemistry and sediment trap observations between 2003 and 2012 at Porcupine Abyssal Plain (PAP) sustained observatory in the Northeast Atlantic. The time series is valuable as it allows for investigation of the link between surface productivity and deep ocean carbon flux. The region is a perennial sink for CO<sub>2</sub>, with an average uptake of around 1.5 mmol m<sup>−2</sup> day<sup>−1</sup>. The average monthly drawdowns of inorganic carbon and nitrogen were used to quantify the net community production (NCP) and new production. Seaso

APA, Harvard, Vancouver, ISO, and other styles

23

Meiritz, Luisa Chiara, Tim Rixen, Anja Karin van der Plas, Tarron Lamont, and Niko Lahajnar. "The influence of zooplankton and oxygen on the particulate organic carbon flux in the Benguela Upwelling System." Biogeosciences 21, no. 22 (2024): 5261–76. http://dx.doi.org/10.5194/bg-21-5261-2024.

Full text

Abstract:

Abstract. We conducted sediment trap experiments in the Benguela Upwelling System (BUS) in the southeastern Atlantic Ocean to study the influence of zooplankton on the flux of particulate organic carbon (POC) through the water column and its sedimentation. A total of 2 long-term moored and 16 short-term free-floating sediment trap systems (drifter systems) were deployed. The mooring experiments were conducted over more than a decade (2009–2022), and the 16 drifters were deployed on three different research cruises between 2019 and 2021. Zooplankton was separated from the trapped material and d

APA, Harvard, Vancouver, ISO, and other styles

24

Gaches, Brandt A. L., Thomas G. Bisbas, and Shmuel Bialy. "The impact of cosmic-ray attenuation on the carbon cycle emission in molecular clouds." Astronomy & Astrophysics 658 (February 2022): A151. http://dx.doi.org/10.1051/0004-6361/202142411.

Full text

Abstract:

Context. Observations of the emission of the carbon cycle species (C, C+, CO) are commonly used to diagnose gas properties in the interstellar medium, but they are significantly sensitive to the cosmic-ray ionization rate. The carbon-cycle chemistry is known to be quite sensitive to the cosmic-ray ionization rate, ζ, controlled by the flux of low-energy cosmic rays which get attenuated through molecular clouds. However, astrochemical models commonly assume a constant cosmic-ray ionization rate in the clouds. Aims. We investigate the effect of cosmic-ray attenuation on the emission of carbon cy

APA, Harvard, Vancouver, ISO, and other styles

25

Helmke, Peer, Susanne Neuer, Michael W. Lomas, Maureen Conte, and Tim Freudenthal. "Cross-basin differences in particulate organic carbon export and flux attenuation in the subtropical North Atlantic gyre." Deep Sea Research Part I: Oceanographic Research Papers 57, no. 2 (2010): 213–27. http://dx.doi.org/10.1016/j.dsr.2009.11.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Rosengard, S. Z., P. J. Lam, W. M. Balch, et al. "Carbon export and transfer to depth across the Southern Ocean Great Calcite Belt." Biogeosciences 12, no. 13 (2015): 3953–71. http://dx.doi.org/10.5194/bg-12-3953-2015.

Full text

Abstract:

Abstract. Sequestration of carbon by the marine biological pump depends on the processes that alter, remineralize, and preserve particulate organic carbon (POC) during transit to the deep ocean. Here, we present data collected from the Great Calcite Belt, a calcite-rich band across the Southern Ocean surface, to compare the transformation of POC in the euphotic and mesopelagic zones of the water column. The 234Th-derived export fluxes and size-fractionated concentrations of POC, particulate inorganic carbon (PIC), and biogenic silica (BSi) were measured from the upper 1000 m of 27 stations acr

APA, Harvard, Vancouver, ISO, and other styles

27

Rosengard, S. Z., P. J. Lam, W. M. Balch, et al. "Carbon export and transfer to depth across the Southern Ocean Great Calcite Belt." Biogeosciences Discussions 12, no. 3 (2015): 2843–96. http://dx.doi.org/10.5194/bgd-12-2843-2015.

Full text

Abstract:

Abstract. Sequestration of carbon by the marine biological pump depends on the processes that alter, remineralize and preserve particulate organic carbon (POC) during transit to the deep ocean. Here, we present data collected from the Great Calcite Belt, a calcite-rich band across the Southern Ocean surface, to compare the transformation of POC in the euphotic and mesopelagic zones of the water column. The 234Th-derived export fluxes and size-fractionated concentrations of POC, particulate inorganic carbon (PIC), and biogenic silica (BSi) were measured from the upper 1000 m of 27 stations acro

APA, Harvard, Vancouver, ISO, and other styles

28

Lomas, M. W., D. K. Steinberg, T. Dickey, et al. "Increased ocean carbon export in the Sargasso Sea is countered by its enhanced mesopelagic attenuation." Biogeosciences Discussions 6, no. 5 (2009): 9547–82. http://dx.doi.org/10.5194/bgd-6-9547-2009.

Full text

Abstract:

Abstract. Photosynthetic CO2 uptake by oceanic phytoplankton and subsequent export of particulate organic carbon (POC) to the ocean interior comprises a globally significant biological carbon pump, controlled in part by the composition of the planktonic community. The strength and efficiency of this pump depends upon the balance of particle production in the euphotic zone and remineralization of those particles in the mesopelagic (defined here as depths between 150 and 300 m), but how these processes respond to climate-driven changes in the physical environment is not completely understood. In

APA, Harvard, Vancouver, ISO, and other styles

29

Lomas, M. W., D. K. Steinberg, T. Dickey, et al. "Increased ocean carbon export in the Sargasso Sea linked to climate variability is countered by its enhanced mesopelagic attenuation." Biogeosciences 7, no. 1 (2010): 57–70. http://dx.doi.org/10.5194/bg-7-57-2010.

Full text

Abstract:

Abstract. Photosynthetic CO2 uptake by oceanic phytoplankton and subsequent export of particulate organic carbon (POC) to the ocean interior comprises a globally significant biological carbon pump, controlled in part by the composition of the planktonic community. The strength and efficiency of this pump depends upon the balance of particle production in the euphotic zone and remineralization of those particles in the mesopelagic (defined here as depths between 150 and 300 m), but how these processes respond to climate-driven changes in the physical environment is not completely understood. In

APA, Harvard, Vancouver, ISO, and other styles

30

Packard, T. T., N. Osma, I. Fernández-Urruzola, L. A. Codispoti, J. P. Christensen, and M. Gómez. "Peru upwelling plankton respiration: calculations of carbon flux, nutrient retention efficiency and heterotrophic energy production." Biogeosciences Discussions 11, no. 11 (2014): 16177–206. http://dx.doi.org/10.5194/bgd-11-16177-2014.

Full text

Abstract:

Abstract. Oceanic depth profiles of plankton respiration are described by a power function, RCO2 = (RCO2)0(z/z0)b similar to the vertical carbon flux profile. Furthermore, because both ocean processes are closely related, conceptually and mathematically, each can be calculated from the other. The exponent (b), always negative, defines the maximum curvature of the respiration depth-profile and controls the carbon flux. When b is large, the C flux (FC) from the epipelagic ocean is low and the nutrient retention efficiency (NRE) is high allowing these waters to maintain high productivity. The opp

APA, Harvard, Vancouver, ISO, and other styles

31

Cavan, E. L., F. A. C. Le Moigne, A. J. Poulton, et al. "Attenuation of particulate organic carbon flux in the Scotia Sea, Southern Ocean, is controlled by zooplankton fecal pellets." Geophysical Research Letters 42, no. 3 (2015): 821–30. http://dx.doi.org/10.1002/2014gl062744.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Packard, T. T., N. Osma, I. Fernández-Urruzola, L. A. Codispoti, J. P. Christensen, and M. Gómez. "Peruvian upwelling plankton respiration: calculations of carbon flux, nutrient retention efficiency, and heterotrophic energy production." Biogeosciences 12, no. 9 (2015): 2641–54. http://dx.doi.org/10.5194/bg-12-2641-2015.

Full text

Abstract:

Abstract. Oceanic depth profiles of plankton respiration are described by a power function, RCO2 = (RCO2)0 (z/z0)b, similar to the vertical carbon flux profile. Furthermore, because both ocean processes are closely related, conceptually and mathematically, each can be calculated from the other. The exponent b, always negative, defines the maximum curvature of the respiration–depth profile and controls the carbon flux. When |b| is large, the carbon flux (FC) from the epipelagic ocean is low and the nutrient retention efficiency (NRE) is high, allowing these waters to maintain high productivity.

APA, Harvard, Vancouver, ISO, and other styles

33

Keil, Richard G., Jacquelyn A. Neibauer, Christina Biladeau, Kelsey van der Elst, and Allan H. Devol. "A multiproxy approach to understanding the "enhanced" flux of organic matter through the oxygen-deficient waters of the Arabian Sea." Biogeosciences 13, no. 7 (2016): 2077–92. http://dx.doi.org/10.5194/bg-13-2077-2016.

Full text

Abstract:

Abstract. Free-drifting sediment net traps were deployed 14 times at depths between 80 and 500 m for 1–3 days each during the late monsoon–intermonsoon transition in the central Arabian Sea. Two locations (19.5 and 15.5° N) were within the permanently oxygen-deficient zone (ODZ), and a third (11° N) had a shallow and thin oxygen minimum. The secondary nitrite maximum, which serves as a tracer of the ODZ, thinned from ∼ 250 m thick at stations 19.5 and 15.5° N to ∼ 50 m thick at station 11° N. Overall, organic carbon fluxes ranged from 13.2 g m2 yr−1 at 80 m to a minimum of 1.1 g m2 yr−1 at 500

APA, Harvard, Vancouver, ISO, and other styles

34

Keil, R. G., J. Neibauer, C. Biladeau, K. van der Elst, and A. H. Devol. "A multiproxy approach to understanding the "enhanced" flux of organic matter through the oxygen deficient waters of the Arabian Sea." Biogeosciences Discussions 12, no. 20 (2015): 17051–92. http://dx.doi.org/10.5194/bgd-12-17051-2015.

Full text

Abstract:

Abstract. Free-drifting sediment net traps were deployed 14 times at depths between 80 and 500 m for 1–3 days each during the late monsoon/intermonsoon transition in the central Arabian Sea. Two locations (19.5 and 15.5° N) were within the permanently oxygen deficient zone, and a third (11° N) had a shallow and thin oxygen minimum. The secondary nitrite maximum, which serves as a tracer of the oxygen deficient zone (ODZ) zone, thinned from ∼ 250 m thick at stations 19.5 and 15.5° N to ∼ 50 m thick at station 11° N. Overall, organic carbon fluxes ranged from 13.2 g m2 yr−1 at 80 m to a minimum

APA, Harvard, Vancouver, ISO, and other styles

35

van Ramshorst, Justus G. V., Alexander Knohl, José Ángel Callejas-Rodelas, et al. "Lower-cost eddy covariance for CO₂ and H₂O fluxes over grassland and agroforestry." Atmospheric Measurement Techniques 17, no. 20 (2024): 6047–71. http://dx.doi.org/10.5194/amt-17-6047-2024.

Full text

Abstract:

Abstract. Eddy covariance (EC) measurements can provide direct and non-invasive ecosystem measurements of the exchange of energy, water (H2O) and carbon dioxide (CO2). However, conventional eddy covariance (CON-EC) setups (ultrasonic anemometer and infrared gas analyser) can be expensive, which recently led to the development of lower-cost eddy covariance (LC-EC) setups (University of Exeter). In the current study, we tested the performance of an LC-EC setup for CO2 and H2O flux measurements at an agroforestry and adjacent grassland site in a temperate ecosystem in northern Germany. The closed

APA, Harvard, Vancouver, ISO, and other styles

36

Cooper, Matthew G., Laurence C. Smith, Asa K. Rennermalm, et al. "Spectral attenuation coefficients from measurements of light transmission in bare ice on the Greenland Ice Sheet." Cryosphere 15, no. 4 (2021): 1931–53. http://dx.doi.org/10.5194/tc-15-1931-2021.

Full text

Abstract:

Abstract. Light transmission into bare glacial ice affects surface energy balance, biophotochemistry, and light detection and ranging (lidar) laser elevation measurements but has not previously been reported for the Greenland Ice Sheet. We present measurements of spectral transmittance at 350–900 nm in bare glacial ice collected at a field site in the western Greenland ablation zone (67.15∘ N, 50.02∘ W). Empirical irradiance attenuation coefficients at 350–750 nm are ∼ 0.9–8.0 m−1 for ice at 12–124 cm depth. The absorption minimum is at ∼ 390–397 nm, in agreement with snow transmission measure

APA, Harvard, Vancouver, ISO, and other styles

37

Ding, Yi, Zhansheng Guo, Xinan Dong, et al. "Preparation and Characterization of MWCNTs/PVDF Conductive Membrane with Cross-Linked Polymer PVA and Study on Its Anti-Fouling Performance." Membranes 11, no. 9 (2021): 703. http://dx.doi.org/10.3390/membranes11090703.

Full text

Abstract:

Based on carboxylated multi-walled carbon nanotubes (MWCNTs-COOH), a MWCNTs/PVDF conductive membrane was prepared by a vacuum filtration cross-linking method. The surface compositions and morphology of conductive membranes were studied by X-ray photoelectron spectroscopy and high-resolution field emission scanning electron microscopy, respectively. The effects of cross-linked polymeric polyvinyl alcohol (PVA) on the conductive membrane properties such as the porosity, pore size distribution, pure water flux, conductivity, hydrophilicity, stability and antifouling properties were investigated.

APA, Harvard, Vancouver, ISO, and other styles

38

Mammarella, Ivan, Samuli Launiainen, Tiia Gronholm, et al. "Relative Humidity Effect on the High-Frequency Attenuation of Water Vapor Flux Measured by a Closed-Path Eddy Covariance System." Journal of Atmospheric and Oceanic Technology 26, no. 9 (2009): 1856–66. http://dx.doi.org/10.1175/2009jtecha1179.1.

Full text

Abstract:

Abstract In this study the high-frequency loss of carbon dioxide (CO2) and water vapor (H2O) fluxes, measured by a closed-path eddy covariance system, were studied, and the related correction factors through the cospectral transfer function method were calculated. As already reported by other studies, it was found that the age of the sampling tube is a relevant factor to consider when estimating the spectral correction of water vapor fluxes. Moreover, a time-dependent relationship between the characteristic time constant (or response time) for water vapor and the ambient relative humidity was

APA, Harvard, Vancouver, ISO, and other styles

39

Jokulsdottir, Tinna, and David Archer. "A stochastic, Lagrangian model of sinking biogenic aggregates in the ocean (SLAMS 1.0): model formulation, validation and sensitivity." Geoscientific Model Development 9, no. 4 (2016): 1455–76. http://dx.doi.org/10.5194/gmd-9-1455-2016.

Full text

Abstract:

Abstract. We present a new mechanistic model, stochastic, Lagrangian aggregate model of sinking particles (SLAMS) for the biological pump in the ocean, which tracks the evolution of individual particles as they aggregate, disaggregate, sink, and are altered by chemical and biological processes. SLAMS considers the impacts of ballasting by mineral phases, binding of aggregates by transparent exopolymer particles (TEP), zooplankton grazing and the fractal geometry (porosity) of the aggregates. Parameterizations for age-dependent organic carbon (orgC) degradation kinetics, and disaggregation driv

APA, Harvard, Vancouver, ISO, and other styles

40

Jokulsdottir, T., and D. Archer. "A Stochastic, Lagrangian Model of Sinking biogenic aggregates in the ocean (SLAMS 1.0): model formulation, validation and sensitivity." Geoscientific Model Development Discussions 8, no. 7 (2015): 5931–82. http://dx.doi.org/10.5194/gmdd-8-5931-2015.

Full text

Abstract:

Abstract. We present a new mechanistic model, Stochastic Lagrangian Aggregate Model of Sinking particles (SLAMS) for the biological pump in the ocean, which tracks the evolution of individual particles as they aggregate, disaggregate, sink, and are altered by chemical and biological processes. SLAMS considers the impacts of ballasting by mineral phases, binding of aggregates by transparent exopolymer particles (TEP), zooplankton grazing, and the fractal geometry (porosity) of the aggregates. Parameterizations for age-dependent organic carbon (orgC) degradation kinetics, and disaggregation driv

APA, Harvard, Vancouver, ISO, and other styles

41

Yang, Mingxi, John Prytherch, Elena Kozlova, Margaret J. Yelland, Deepulal Parenkat Mony, and Thomas G. Bell. "Comparison of two closed-path cavity-based spectrometers for measuring air–water CO<sub>2</sub> and CH<sub>4</sub> fluxes by eddy covariance." Atmospheric Measurement Techniques 9, no. 11 (2016): 5509–22. http://dx.doi.org/10.5194/amt-9-5509-2016.

Full text

Abstract:

Abstract. In recent years several commercialised closed-path cavity-based spectroscopic instruments designed for eddy covariance flux measurements of carbon dioxide (CO2), methane (CH4), and water vapour (H2O) have become available. Here we compare the performance of two leading models – the Picarro G2311-f and the Los Gatos Research (LGR) Fast Greenhouse Gas Analyzer (FGGA) at a coastal site. Both instruments can compute dry mixing ratios of CO2 and CH4 based on concurrently measured H2O, temperature, and pressure. Additionally, we used a high throughput Nafion dryer to physically remove H2O

APA, Harvard, Vancouver, ISO, and other styles

42

Honkanen, Martti, Juha-Pekka Tuovinen, Tuomas Laurila, et al. "Measuring turbulent CO<sub>2</sub> fluxes with a closed-path gas analyzer in a marine environment." Atmospheric Measurement Techniques 11, no. 9 (2018): 5335–50. http://dx.doi.org/10.5194/amt-11-5335-2018.

Full text

Abstract:

Abstract. In this study, we introduce new observations of sea–air fluxes of carbon dioxide using the eddy covariance method. The measurements took place at the Utö Atmospheric and Marine Research Station on the island of Utö in the Baltic Sea in July–October 2017. The flux measurement system is based on a closed-path infrared gas analyzer (LI-7000, LI-COR) requiring only occasional maintenance, making the station capable of continuous monitoring. However, such infrared gas analyzers are prone to significant water vapor interference in a marine environment, where CO2 fluxes are small. Two LI-70

APA, Harvard, Vancouver, ISO, and other styles

43

Loginova, Alexandra N., Sören Thomsen, Marcus Dengler, Jan Lüdke, and Anja Engel. "Diapycnal dissolved organic matter supply into the upper Peruvian oxycline." Biogeosciences 16, no. 9 (2019): 2033–47. http://dx.doi.org/10.5194/bg-16-2033-2019.

Full text

Abstract:

Abstract. The eastern tropical South Pacific (ETSP) hosts the Peruvian upwelling system, which represents one of the most productive areas in the world ocean. High primary production followed by rapid heterotrophic utilization of organic matter supports the formation of one of the most intense oxygen minimum zones (OMZs) in the world ocean, where dissolved oxygen (O2) concentrations reach less than 1 µmol kg−1. The high productivity leads to an accumulation of dissolved organic matter (DOM) in the surface layers that may serve as a substrate for heterotrophic respiration. However, the importan

APA, Harvard, Vancouver, ISO, and other styles

44

Wintjen, Pascal, Christof Ammann, Frederik Schrader, and Christian Brümmer. "Correcting high-frequency losses of reactive nitrogen flux measurements." Atmospheric Measurement Techniques 13, no. 6 (2020): 2923–48. http://dx.doi.org/10.5194/amt-13-2923-2020.

Full text

Abstract:

Abstract. Flux measurements of reactive nitrogen compounds are of increasing importance to assess the impact of unintended emissions on sensitive ecosystems and to evaluate the efficiency of mitigation strategies. Therefore, it is necessary to determine the exchange of reactive nitrogen gases with the highest possible accuracy. This study gives insight into the performance of flux correction methods and their usability for reactive nitrogen gases. The eddy-covariance (EC) technique is today widely used in experimental field studies to measure land surface–atmosphere exchange of a variety of tr

APA, Harvard, Vancouver, ISO, and other styles

45

Lombard, Fabien, Marja Koski, and Thomas Kiørboe. "Copepods use chemical trails to find sinking marine snow aggregates." Limnology and oceanography 58, no. 1 (2012): 185–92. https://doi.org/10.4319/lo.2013.58.1.0185.

Full text

Abstract:

Copepods are major consumers of sinking marine particles and hence reduce the efficiency of the biological carbon pump. Their high abundance on marine snow suggests that they can detect sinking particles remotely. By means of laboratory observations, we show that the copepod Temora longicornis can detect chemical trails originating from sinking marine snow particles (appendicularian houses). The chemical cue was detected by copepods from a distance of .25 particle radii, with the probability of detection decreasing with distance. The behavior of T. longicornis following the trail resembled the

APA, Harvard, Vancouver, ISO, and other styles

46

Wu, Lingxiao, Tianlu Chen, Nima Ciren, et al. "Development of a Machine Learning Forecast Model for Global Horizontal Irradiation Adapted to Tibet Based on Visible All-Sky Imaging." Remote Sensing 15, no. 9 (2023): 2340. http://dx.doi.org/10.3390/rs15092340.

Full text

Abstract:

The Qinghai-Tibet Plateau is rich in renewable solar energy resources. Under the background of China’s “dual-carbon” strategy, it is of great significance to develop a global horizontal irradiation (GHI) prediction model suitable for Tibet. In the radiation balance budget process of the Earth-atmosphere system, clouds, aerosols, air molecules, water vapor, ozone, CO2 and other components have a direct influence on the solar radiation flux received at the surface. For the descending solar shortwave radiation flux in Tibet, the attenuation effect of clouds is the key variable of the first order.

APA, Harvard, Vancouver, ISO, and other styles

47

Archer, D. "A model of the methane cycle, permafrost, and hydrology of the Siberian continental margin." Biogeosciences Discussions 11, no. 6 (2014): 7853–900. http://dx.doi.org/10.5194/bgd-11-7853-2014.

Full text

Abstract:

Abstract. A two-dimensional model of a passive continental margin was adapted to the simulation of the methane cycle on Siberian continental shelf and slope, attempting to account for the impacts of glacial/interglacial cycles in sea level, alternately exposing the continental shelf to freezing conditions with deep permafrost formation during glacial times, and immersion in the ocean in interglacial times. The model is used to gauge the impact of the glacial cycles, and potential anthropogenic warming in the deep future, on the atmospheric methane emission flux, and the sensitivities of that f

APA, Harvard, Vancouver, ISO, and other styles

48

Weston, William C., Karen H. Hales, and Dale B. Hales. "Flaxseed Reduces Cancer Risk by Altering Bioenergetic Pathways in Liver: Connecting SAM Biosynthesis to Cellular Energy." Metabolites 13, no. 8 (2023): 945. http://dx.doi.org/10.3390/metabo13080945.

Full text

Abstract:

This article illustrates how dietary flaxseed can be used to reduce cancer risk, specifically by attenuating obesity, type 2 diabetes, and non-alcoholic fatty liver disease (NAFLD). We utilize a targeted metabolomics dataset in combination with a reanalysis of past work to investigate the “metabo-bioenergetic” adaptations that occur in White Leghorn laying hens while consuming dietary flaxseed. Recently, we revealed how the anti-vitamin B6 effects of flaxseed augment one-carbon metabolism in a manner that accelerates S-adenosylmethionine (SAM) biosynthesis. Researchers recently showed that acc

APA, Harvard, Vancouver, ISO, and other styles

49

Freeman, Matthew J., Noah J. Eral, and John-Demian Sauer. "Listeria monocytogenes requires phosphotransferase systems to facilitate intracellular growth and virulence." PLOS Pathogens 21, no. 4 (2025): e1012492. https://doi.org/10.1371/journal.ppat.1012492.

Full text

Abstract:

The metabolism of bacterial pathogens is exquisitely evolved to support virulence in the nutrient-limiting host. Many bacterial pathogens utilize bipartite metabolism to support intracellular growth by splitting carbon utilization between two carbon sources and dividing flux to distinct metabolic needs. For example, previous studies suggest that the professional cytosolic pathogen Listeria monocytogenes (L. monocytogenes) utilizes glycerol and hexose phosphates (e.g., Glucose-6-Phosphate) as catabolic and anabolic carbon sources in the host cytosol, respectively. However, the role of this puta

APA, Harvard, Vancouver, ISO, and other styles

50

McNair, HM, and S. Menden-Deuer. "Protist grazing contributes to microbial food web at the upper boundary of the twilight zone in the subarctic Pacific." Marine Ecology Progress Series 636 (February 20, 2020): 235–41. http://dx.doi.org/10.3354/meps13246.

Full text

Abstract:

Grazing by herbivorous protists (microzooplankton) is a major loss pathway of primary production in the surface ocean, yet its impact below the well-lit surface ocean is largely unknown. The upper boundary of the twilight zone is critically important to understanding carbon cycling and is often the depth of highest attenuation of particulate carbon flux. Available measurements of primary production and grazing below the well-lit surface ocean suggest that the upper boundary of the twilight zone may harbor active but poorly constrained food web processes. Previous grazing rates from the base of

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!