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Artykuły w czasopismach na temat „Dissolved oxygen diurnal cycles”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 5 lutego 2022

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1

Briciu, Andrei-Emil, Adrian Graur, Dinu Iulian Oprea, and Constantin Filote. "A Methodology for the Fast Comparison of Streamwater Diurnal Cycles at Two Monitoring Points." Water 11, no. 12 (2019): 2524. http://dx.doi.org/10.3390/w11122524.

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There are numerous streamwater parameters that exhibit a diurnal cycle. However, the shape of this cycle has a huge variation from one parameter to another and from one monitoring point to another on the same river. Important variations also occur at the same point during some events, such as high waters. Water level, specific conductivity, dissolved oxygen, oxidation reduction potential, and pH of the Suceava River were monitored for 365 days (2018–2019, hourly sampling frequency) in order to assess the upstream-downstream changes in the diurnal cycle of these parameters, some of these change

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2

Ribas-Ribas, M., L. I. Carracedo, E. Anfuso, and J. M. Forja. "Tidal and seasonal carbon and nutrients dynamics of the Guadalquivir Estuary and the Bay of Cádiz (SW Iberian Peninsula)." Biogeosciences Discussions 9, no. 10 (2012): 14537–58. http://dx.doi.org/10.5194/bgd-9-14537-2012.

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Abstract. To study the effects of the physical environment on carbon and nutrients cycles dynamics in the north eastern shelf of the Gulf of Cádiz, changes in currents, tides, salinity, temperature, carbon system parameters (fugacity of CO2 (fCO2), dissolved organic carbon, dissolved inorganic carbon and pH) and others related (dissolved oxygen, total dissolved nitrogen, nutrients and suspended particulate matter) were measured in transects across the Guadalquivir Estuary and Bay of Cádiz mouths. Thus, the main objective of this study is to investigate the influence of these inner ecosystems o

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3

Harmon, Russell S., Deborah L. Leslie, W. Berry Lyons, Kathleen A. Welch, and Diane M. McKnight. "Diurnal chemistry of two contrasting stream types, Taylor Valley, McMurdo Dry Valley Region, Antarctica." E3S Web of Conferences 98 (2019): 01020. http://dx.doi.org/10.1051/e3sconf/20199801020.

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Numerous ephemeral streams flow within the McMurdo Dry Valley Region of Antarctica that transport glacial meltwater to perennially ice-covered, closed-basin lakes during the austral summer. The diurnal behavior for two Taylor Valley streams of different character was examined during the summer of 2010-11. Andersen Creek is a short, 1st-order proglacial stream, whereas Von Guerard Stream is a long, high-order stream with an extensive hyporheic zone that has a substantial cyanobacterial algal mat community in its middle reaches. Both streams display strong daily cycles for temperature, electrica

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4

Zanardi-Lamardo, Eliete, Carlos Augusto França Schettini, Amanda Alves Vieira-Campos, Carolina Barbosa Cabral, and Marília S. Silva. "Intratidal variability and transport of petroleum aromatic hydrocarbons in an anthropized tropical estuarine system: the Suape estuary (8.4S 35W)." Brazilian Journal of Oceanography 66, no. 1 (2018): 47–57. http://dx.doi.org/10.1590/s1679-87592018148006601.

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Abstract The Suape Estuary encompasses the Suape Industrial Port Complex (SIPC), a major industrial development in Brazil's Northeast region, which, in order to be implanted, caused drastic environmental changes in this system. This study presents the first physical characterization of the Suape estuarine system, focusing on the local hydrodynamics, material transport and its influence on some specific properties. Physical properties were also associated to dissolved dispersed petroleum hydrocarbons (DDPHs). A study was undertaken during a complete semi-diurnal tidal cycle (13 hr), during whic

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5

Ciwanine, Kasigwa Dieudonné, Lonze Joël Katho, Busanga Alodor Kankonda, and Jean-Claude Micha. "Qualité physico-chimique des eaux littorales de la partie Sud-Ouest du Lac Albert, RD Congo." International Journal of Biological and Chemical Sciences 14, no. 5 (2020): 1831–42. http://dx.doi.org/10.4314/ijbcs.v14i5.26.

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Le lac Albert est moins étudié en ce qui concerne l’évolution de la qualité de ses eaux. L’objectif de cette étude était de contribuer à la connaissance de quelques paramètres physico-chimiques des eaux littorales de la partie Sud-Ouest du lac Albert. Pour y parvenir, nous avons utilisé un kit multi-parameter AZ8603 pour le prélèvement, in situ, du pH, de l’oxygène dissous, de la conductivité électrique et de la température pendant un cycle de 24 heures à intervalle de 3 heures durant une année. Il ressort de cette étude que les moyennes de température, conductivité, oxygène dissous et pH sont

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6

Gordon, Christopher, Katja Fennel, Clark Richards, Lynn K. Shay, and Jodi K. Brewster. "Can ocean community production and respiration be determined by measuring high-frequency oxygen profiles from autonomous floats?" Biogeosciences 17, no. 15 (2020): 4119–34. http://dx.doi.org/10.5194/bg-17-4119-2020.

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Abstract. Oceanic primary production forms the basis of the marine food web and provides a pathway for carbon sequestration. Despite its importance, spatial and temporal variations of primary production are poorly observed, in large part because the traditional measurement techniques are laborious and require the presence of a ship. More efficient methods are emerging that take advantage of miniaturized sensors integrated into autonomous platforms such as gliders and profiling floats. One such method relies on determining the diurnal cycle of dissolved oxygen in the mixed layer and has been ap

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7

Reis, PCJ, and FAR Barbosa. "Diurnal sampling reveals significant variation in CO2 emission from a tropical productive lake." Brazilian Journal of Biology 74, no. 3 suppl 1 (2014): S113—S119. http://dx.doi.org/10.1590/1519-6984.01713.

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It is well accepted in the literature that lakes are generally net heterotrophic and supersaturated with CO2 because they receive allochthonous carbon inputs. However, autotrophy and CO2undersaturation may happen for at least part of the time, especially in productive lakes. Since diurnal scale is particularly important to tropical lakes dynamics, we evaluated diurnal changes in pCO2and CO2 flux across the air-water interface in a tropical productive lake in southeastern Brazil (Lake Carioca) over two consecutive days. Both pCO2 and CO2 flux were significantly different between day (9:00 to 17

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8

Geyman, Emily C., and Adam C. Maloof. "A diurnal carbon engine explains 13C-enriched carbonates without increasing the global production of oxygen." Proceedings of the National Academy of Sciences 116, no. 49 (2019): 24433–39. http://dx.doi.org/10.1073/pnas.1908783116.

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In the past 3 billion years, significant volumes of carbonate with high carbon-isotopic (δ13C) values accumulated on shallow continental shelves. These deposits frequently are interpreted as records of elevated global organic carbon burial. However, through the stoichiometry of primary production, organic carbon burial releases a proportional amount of O2, predicting unrealistic rises in atmospheric pO2 during the 1 to 100 million year-long positive δ13C excursions that punctuate the geological record. This carbon–oxygen paradox assumes that the δ13C of shallow water carbonates reflects the δ1

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9

Carberry, J. B., and C. M. Brunner. "Predictions of Diurnal Fluctuations in an Algal Bacterial Clay Wastewater Treatment System." Water Science and Technology 23, no. 7-9 (1991): 1553–61. http://dx.doi.org/10.2166/wst.1991.0609.

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Carberry's proposed algal bacterial clay treatment (ABCT) process would generate an algal biomass, useful as a food source. This study examined the diurnal fluctuations resulting from alternating light-dark periods and the magnitude of resulting O2, CO2, and pH oscillations. The magnitude of these oscillations was studied under controlled conditions, in order to determine acceptable limits of these fluctuations. The effects of progressive drifts for these parameter values under uncontrolled conditions was also studied in order to determine the rate of decreasing wastewater bacterial biodegrada

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10

Ribas-Ribas, M., E. Anfuso, A. Gómez-Parra, and J. M. Forja. "Tidal and seasonal carbon and nutrient dynamics of the Guadalquivir estuary and the Bay of Cádiz (SW Iberian Peninsula)." Biogeosciences 10, no. 7 (2013): 4481–91. http://dx.doi.org/10.5194/bg-10-4481-2013.

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Abstract. To study the effects of the physical environment on carbon and nutrient cycle dynamics on the north-eastern shelf of the Gulf of Cádiz, changes in currents, tides, salinity, temperature, carbon system parameters (fugacity of CO2 (fCO2), dissolved organic carbon, dissolved inorganic carbon (DIC) and pH) and other related parameters(dissolved oxygen, total dissolved nitrogen (TDN), nutrients and suspended particulate matter) were measured in transects across the Guadalquivir estuary and Bay of Cádiz mouths. The main objective of this study is to investigate the influence of these inner

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11

Passos, R. G., D. F. C. Dias, M. P. Matos, and M. von Sperling. "Sodium chloride as a tracer for hydrodynamic characterization of a shallow maturation pond." Water Practice and Technology 13, no. 1 (2018): 30–38. http://dx.doi.org/10.2166/wpt.2018.009.

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Abstract The results of tests with a sodium chloride tracer in a shallow maturation pond in Brazil are presented. The pond – a full-scale effluent treatment unit for around 250 p.e – was 0.80 m deep with a length/width ratio of 4.3:1, and had accumulated sludge for 12 years to about 40% of the total volume. The pond is subject to daily cycles of thermal stratification/destratification, as shown by vertical profiles of temperature, dissolved oxygen, pH and redox potential, and by Computational Fluid Dynamics simulations. Four tracer tests were undertaken. There was a tendency to complete mixing

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12

Khadija Mokhliss and Mohammed Moncef. "Effects of environmental parameters on the nycthemeral migratory behaviour of copepod species in the Al Massira reservoir, Morocco." GSC Biological and Pharmaceutical Sciences 13, no. 3 (2020): 162–73. http://dx.doi.org/10.30574/gscbps.2020.13.3.381.

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To improve our knowledge of nocturnal and diurnal migratory activity in copepods and in order to assess the effect of abiotic parameters on this activity, we have undertaken at the level of the Al Massira dam reservoir (dam located on the wadi Oum Erbia, in Morocco) the monitoring of the migration of the main species, during a 24-hour nycthemeral cycle. To be done; the measurement and sampling step is carried out every 4 hours; at different depths of the prospected station. The temperature, pH, dissolved oxygen and chlorophyll a measurements are taken. The systematic position of the main speci

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13

Harmon, Russell S., Deborah L. Leslie, W. Berry Lyons, Kathleen A. Welch, and Diane M. McKnight. "Geochemistry of contrasting stream types, Taylor Valley, Antarctica." GSA Bulletin 133, no. 1-2 (2020): 425–48. http://dx.doi.org/10.1130/b35479.1.

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Abstract The McMurdo Dry Valley region is the largest ice-free area of Antarctica. Ephemeral streams flow here during the austral summer, transporting glacial meltwater to perennially ice-covered, closed basin lakes. The chemistry of 24 Taylor Valley streams was examined over the two-decade period of monitoring from 1993 to 2014, and the geochemical behavior of two streams of contrasting physical and biological character was monitored across the seven weeks of the 2010–2011 flow season. Four species dominate stream solute budgets: HCO3–, Ca2+, Na+, and Cl–, with SO42–, Mg2+, and K+ present in

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14

Briciu, Andrei-Emil, Adrian Graur, and Dinu Iulian Oprea. "Water Quality Index of Suceava River in Suceava City Metropolitan Area." Water 12, no. 8 (2020): 2111. http://dx.doi.org/10.3390/w12082111.

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The water quality of rivers worldwide is of persistent interest due to its impact on human life. Five streamwater quality parameters of Suceava River were monitored in 2019 upstream and downstream of Suceava city, Romania: dissolved oxygen, specific conductivity, pH, oxidation-reduction potential, and temperature. Data was recorded at a high temporal frequency, every hour, and produced Water Quality Index (WQI) time series of similar resolution. Our additive WQI has variants with particular advantages. Water quality of Suceava city exhibits a diurnal cycle. Upstream, WQI values indicate a quas

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15

Akbar, Helmy, Andre Wizemann, Ayu Ervinia, et al. "SOME OCEANOGRAPHIC FEATURES OF PELABUHANRATU BAY, WEST JAVA, INDONESIA." JURNAL ENGGANO 4, no. 1 (2019): 26–42. http://dx.doi.org/10.31186/jenggano.4.1.26-42.

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Pelabuhanratu Bay plays a big role for the flow of nutrients from the land to the sea of Sothern-Java. This study was conducted in Pelabuhanratu Bay, Sukabumi, West Java, in March 2012. The aim of this study is to measure the oceanographic parameters (physical and chemical) of Pelabuhanratu Bay i.e. tides, waves, current, temperature, salinity, depth, density, dissolved oxygen (DO), total suspended solids (TSS), turbidity, pH and nutrients. The bay directly faces the Indian Ocean, during the surveyed we found mean angle of wave refraction was about ~4.3° ± 1.5°, with left side wind direction.

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16

Pathak, Janardan, and M. M. Goswami. "Diel dynamics of heleoplankton in relation to some physico-chemical attributes of water in an aquaculture tank in Guwahati, Assam." Journal of Applied and Natural Science 4, no. 1 (2012): 16–22. http://dx.doi.org/10.31018/jans.v4i1.215.

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Diurnal fluctuation of the phytoplankton and zooplankton population (numerical densities) and the physicochemical attributes of water are studied in an aquaculture pond at Guwahati, Assam. In the 24 hour diel cycle, the phytoplankton and zooplankton show significant (t-test, p < 0.01) variation in their numerical density at an interval of 4 hours. The studied physico-chemical parameters of water included Temperature, Total Alkalinity (TA), Total hardness (TH), Dissolved Oxygen (DO), Free Carbon dioxide (FCO2) and pH are analyzed concurrently, which reveals a significant fluctuation (t-test,

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17

Cotovicz Jr., L. C., B. A. Knoppers, N. Brandini, S. J. Costa Santos, and G. Abril. "A strong CO<sub>2</sub> sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)." Biogeosciences 12, no. 20 (2015): 6125–46. http://dx.doi.org/10.5194/bg-12-6125-2015.

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Abstract. In contrast to its small surface area, the coastal zone plays a disproportionate role in the global carbon cycle. Carbon production, transformation, emission and burial rates at the land–ocean interface are significant at the global scale but still poorly known, especially in tropical regions. Surface water pCO2 and ancillary parameters were monitored during nine field campaigns between April 2013 and April 2014 in Guanabara Bay, a tropical eutrophic to hypertrophic semi-enclosed estuarine embayment surrounded by the city of Rio de Janeiro, southeast Brazil. Water pCO2 varied between

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18

Cotovicz, L. C., B. A. Knoppers, N. Brandini, S. J. Costa Santos, and G. Abril. "A large CO<sub>2</sub> sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)." Biogeosciences Discussions 12, no. 6 (2015): 4671–720. http://dx.doi.org/10.5194/bgd-12-4671-2015.

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Abstract. In contrast to its small surface area, the coastal zone plays a disproportionate role in the global carbon cycle. Carbon production, transformation, emission and burial rates at the land–ocean interface are still poorly known, especially in tropical regions. Surface water pCO2 and ancillary parameters were monitored during nine field campaigns between April 2013 and April 2014 in Guanabara Bay, a tropical eutrophic to hypertrophic semi-enclosed estuarine embayment surrounded by the city of Rio de Janeiro, SE-Brazil. Water pCO2 varied between 22 and 3715 ppmv in the Bay showing spatia

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19

Garcés-Rodríguez, Yuliesky, José M. Mazón -Suástegui, Abel Betanzos-Vega, Pascual Rodríguez-Cruzata, and Mercedes Mercedes Isla-Molleda. "EVALUACIÓN DE SITIO PARA CULTIVO DE PECES MARINOS EN BOCA AMBUILA, REGIÓN SUR-CENTRAL DE CUBA." CICIMAR Oceánides 31, no. 2 (2016): 1. http://dx.doi.org/10.37543/oceanides.v31i2.182.

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RESUMEN. La evaluación de sitios marinos constituye una tarea prioritaria en el inventario de zonas marinas con potencial para el cultivo de peces; esta es importante en términos de costos de inversión/operación y rentabilidad derivada del crecimiento y supervivencia de la especie a cultivar. En general, las características oceanográficas del sitio determinan la eficiencia y viabilidad técnica, operativa y económica del cultivo. Se evaluó el potencial de las aguas costeras abiertas adyacentes a la localidad de Boca Ambuila, Cienfuegos, región sur central de Cuba. Esto se hizo a partir de estud

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Kayombo, S., T. S. A. Mbwette, A. W. Mayo, J. H. Y. Katima, and S. E. Jorgensen. "Modelling diurnal variation of dissolved oxygen in waste stabilization ponds." Ecological Modelling 127, no. 1 (2000): 21–31. http://dx.doi.org/10.1016/s0304-3800(99)00196-9.

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Schilling, Keith E., and Peter Jacobson. "Field Observation of Diurnal Dissolved Oxygen Fluctuations in Shallow Groundwater." Groundwater 53, no. 3 (2014): 493–97. http://dx.doi.org/10.1111/gwat.12218.

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22

Soulsby, P. G., M. Mollowney, G. Marsh, and D. Lowthion. "The Role of Phytoplankton in the Dissolved Oxygen Budget of a Stratified Estuary." Water Science and Technology 17, no. 4-5 (1985): 745–56. http://dx.doi.org/10.2166/wst.1985.0176.

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Observations of dissolved oxygen in the Test Estuary, Southern England have shown lowest levels following a mid summer phytoplankton bloom. The bloom was dominated by the ciliate Mesodinium rubrum (Lohmann). A numerical model has been developed to calculate the water circulation, vertical mixing, dissolved oxygen and chlorophyll a. To obtain good agreement between observed and predicted dissolved oxygen and chlorophyll a distributions, it was necessary to simulate a unique characteristic, the diurnal vertical migration of Mesodinium.

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23

Dong, C., W. Zhu, Y. Q. Zhao, and M. Gao. "Diurnal fluctuations in root oxygen release rate and dissolved oxygen budget in wetland mesocosm." Desalination 272, no. 1-3 (2011): 254–58. http://dx.doi.org/10.1016/j.desal.2011.01.030.

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Stratford, C. J., M. P. McCartney, and R. J. Williams. "Seasonal and diurnal hydro-chemical variations in a recreated reed bed." Hydrology and Earth System Sciences 8, no. 2 (2004): 266–75. http://dx.doi.org/10.5194/hess-8-266-2004.

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Abstract. To help stem this decline, wetland areas are now being preserved and where possible created. This study investigated water quality in a recreated reed bed in south-west England designed specifically to provide habitat for birds. Since June 2000, continuous measurements of temperature, pH, electrical conductivity and dissolved oxygen have been logged. These data enable the partial pressure of CO2 to be calculated. This paper looks at the data collected up to November 2001. Despite similar solar radiation and water temperature conditions in both 2000 and 2001, peak summertime values of

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25

Gudjonsson, G., J. Vollertsen, and T. Hvitved-Jacobsen. "Dissolved oxygen in gravity sewers – measurement and simulation." Water Science and Technology 45, no. 3 (2002): 35–44. http://dx.doi.org/10.2166/wst.2002.0049.

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Dissolved oxygen (DO) concentrations were during 2 months continuously measured in an intercepting sewer. Measurements were made upstream and downstream in a 3.6 km gravity sewer. DO showed significant diurnal variations mainly caused by changes in the organic matter composition of the wastewater. At low temperatures the gravity sewer was strictly aerobic. However, towards the end of the measuring campaign, DO concentrations decreased as temperature increased and the sewer became anaerobic part of the day. A conceptual model that takes into account bulk water and biofilm DO uptake as well as r

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Peña, M. A., S. Katsev, T. Oguz, and D. Gilbert. "Modeling dissolved oxygen dynamics and hypoxia." Biogeosciences 7, no. 3 (2010): 933–57. http://dx.doi.org/10.5194/bg-7-933-2010.

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Abstract. Hypoxia conditions are increasing throughout the world, influencing biogeochemical cycles of elements and marine life. Hypoxia results from complex interactions between physical and biogeochemical processes, which can not be understood by observations alone. Models are invaluable tools at studying system dynamics, generalizing discrete observations and predicting future states. They are also useful as management tools for evaluating site-specific responses to management scenarios. Here we review oxygen dynamics models that have significantly contributed to a better understanding of t

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27

Balangoda, Anusha. "Effect of Diurnal Variation of Dissolved Oxygen in a Eutrophic Polymictic Reservoir." American Journal of Environmental Sciences 13, no. 1 (2017): 30–46. http://dx.doi.org/10.3844/ajessp.2017.30.46.

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Broadbent, Andrew, and Graham Jones. "Seasonal and Diurnal Cycles of Dimethylsulfide, Dimethylsulfoniopropionate and Dimethylsulfoxide at One Tree Reef Lagoon." Environmental Chemistry 3, no. 4 (2006): 260. http://dx.doi.org/10.1071/en06011.

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Environmental Context. Coral reefs have now been highlighted as significant sources of dimethylsulfide and other organic sulfur compounds, which may be important for the formation of clouds over the ocean and climate regulation. However, no studies have reported the seasonal and diurnal cycles of these organic sulfur substances in reef waters. This study describes the cycling of dimethylsulfide and related organic substances at One Tree Reef, in the southern part of the Great Barrier Reef, as well as their production from staghorn coral in chamber experiments. The results suggest that coral re

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Rahaman, AKM Fazlur, MA Mansur, and M. Shahidur Rahman. "Monthly and diurnal variations of limnological conditions of two ponds." International Journal of Agricultural Research, Innovation and Technology 7, no. 1 (2017): 14–20. http://dx.doi.org/10.3329/ijarit.v7i1.33316.

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A study on monthly and diurnal changes of limnological conditions of two ponds was conducted in the Bangladesh Agricultural University campus, Mymensingh. The research work was performed by studying the limnological parameters such as transparency, temperature, dissolved oxygen, free carbon dioxide, pH, total alkalinity, nitrate-nitrogen, phosphate-phosphorus and plankton. Diurnal variations of physico-chemical factors were studied fortnightly at 6 hrs intervals at 6 a.m., 12 noon, 6 p.m. and 12 midnight. The amounts of transparency, dissolved oxygen and pH were higher during winter months tha

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Andersen, Mikkel R., Theis Kragh, and Kaj Sand-Jensen. "Extreme diel dissolved oxygen and carbon cycles in shallow vegetated lakes." Proceedings of the Royal Society B: Biological Sciences 284, no. 1862 (2017): 20171427. http://dx.doi.org/10.1098/rspb.2017.1427.

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A common perception in limnology is that shallow lakes are homogeneously mixed owing to their small water volume. However, this perception is largely gained by downscaling knowledge from large lakes to their smaller counterparts. Here we show that shallow vegetated lakes (less than 0.6 m), in fact, undergo recurring daytime stratification and nocturnal mixing accompanied by extreme chemical variations during summer. Dense submerged vegetation effectively attenuates light and turbulence generating separation between warm surface waters and much colder bottom waters. Photosynthesis in surface wa

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Guasch, Helena, Joan Armengol, Eugènia Martı́, and Sergi Sabater. "Diurnal variation in dissolved oxygen and carbon dioxide in two low-order streams." Water Research 32, no. 4 (1998): 1067–74. http://dx.doi.org/10.1016/s0043-1354(97)00330-8.

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Tasnim, Bushra, Jalil A. Jamily, Xing Fang, Yangen Zhou, and Joel S. Hayworth. "Simulating Diurnal Variations of Water Temperature and Dissolved Oxygen in Shallow Minnesota Lakes." Water 13, no. 14 (2021): 1980. http://dx.doi.org/10.3390/w13141980.

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In shallow lakes, water quality is mostly affected by weather conditions and some ecological processes which vary throughout the day. To understand and model diurnal-nocturnal variations, a deterministic, one-dimensional hourly lake water quality model MINLAKE2018 was modified from daily MINLAKE2012, and applied to five shallow lakes in Minnesota to simulate water temperature and dissolved oxygen (DO) over multiple years. A maximum diurnal water temperature variation of 11.40 °C and DO variation of 5.63 mg/L were simulated. The root-mean-square errors (RMSEs) of simulated hourly surface temper

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Rajwa-Kuligiewicz, Agnieszka, Robert J. Bialik, and Paweł M. Rowiński. "Dissolved oxygen and water temperature dynamics in lowland rivers over various timescales." Journal of Hydrology and Hydromechanics 63, no. 4 (2015): 353–63. http://dx.doi.org/10.1515/johh-2015-0041.

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Abstract The impact of floodplain hydrology on the in-stream dissolved oxygen dynamics and the relation between dissolved oxygen and water temperature are investigated. This has been done by examining the time series of dissolved oxygen and water temperature coupled with meteorological and hydrological data obtained from two lowland rivers having contrasting hydrological settings. Spectral analysis of long-term oxygen variations in a vegetated river revealed a distinct scaling regime with slope ‘–1’ indicating a self-similar behaviour. Identical slopes were obtained for water temperature and w

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Branco, Brett F., and Thomas Torgersen. "Diurnal sediment resuspension and settling: impact on the coupled physical and biogeochemical dynamics of dissolved oxygen and carbon in a shallow water body." Marine and Freshwater Research 60, no. 7 (2009): 669. http://dx.doi.org/10.1071/mf08113.

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Small, shallow, inland water bodies are ubiquitous on the landscape and may be significant hotspots for biogeochemical transformations. However, the coupled physical and biogeochemical dynamics of these systems have received little attention compared with larger and deeper systems. Here, we examine the coupling between physical dynamics, sediment dynamics and oxygen–carbon dynamics in Mirror Lake, a small shallow pond in Storrs, CT, USA, using high frequency monitoring data and a simple coupled physical–biogeochemical model. The physical dynamics are characterised by a diurnal pattern of dayti

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Peña, M. A., S. Katsev, T. Oguz, and D. Gilbert. "Modeling dissolved oxygen dynamics and coastal hypoxia: a review." Biogeosciences Discussions 6, no. 5 (2009): 9195–256. http://dx.doi.org/10.5194/bgd-6-9195-2009.

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Abstract. Hypoxia occurs in marine ecosystems throughout the world, influences biogeochemical cycles of elements and may have severe impacts on marine life. Hypoxia results from complex interactions between physical and biogeochemical processes, which can not be addressed by observations alone. In this paper, we review oxygen dynamical models that have been applied in studies of factors controlling coastal hypoxia and in predictions of future states. We also identify scientific issues that need further development and point out some of the major challenges. Over recent decades, substantial pro

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Carlton, Richard G., and Robert G. Wetzel. "Distributions and fates of oxygen in periphyton communities." Canadian Journal of Botany 65, no. 5 (1987): 1031–37. http://dx.doi.org/10.1139/b87-143.

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Direct measurements with oxygen microelectrodes demonstrated that the distribution of dissolved oxygen in periphyton communities varied on a diurnal basis and was markedly different among periphyton types. During illumination, photosynthesis in periphyton resulted in oxygen supersaturation in microzones that were subsaturated or anoxic during darkness. The fate of oxygen produced within periphyton depended on the relative rates of production and consumption, the diffusion characteristics of the periphyton, physical and chemical interactions with the substratum, and the transport rate across th

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Pal, Mihir, Nihar R. Samal, Malabika B. Roy, and Pankaj K. Roy. "Modelling of Diurnal Profile of Surface Air Temperature and Surface Dissolved Oxygen of Lake Water." Current Science 111, no. 5 (2016): 882. http://dx.doi.org/10.18520/cs/v111/i5/882-885.

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Tudor, Mladen. "Diurnal changes of dissolved oxygen in fouling land-based tanks for rearing of sea bass." Aquacultural Engineering 19, no. 4 (1999): 243–58. http://dx.doi.org/10.1016/s0144-8609(98)00053-3.

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Carberry, J. B., and R. W. Greene. "Model of Algal Bacterial Clay Wastewater Treatment System." Water Science and Technology 26, no. 7-8 (1992): 1697–706. http://dx.doi.org/10.2166/wst.1992.0613.

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A computer model is presented for an innovative wastewater treatment process known as the Algae-Bacterial-Clay Treatment (ABCT) system. In this process the photosynthetic production of dissolved oxygen by algae supports the bacterial breakdown of organic matter in wastewater. Clay is added to the plug flow reactor to dampen input BOD variation. The model was developed to gain an improved understanding of transient behavior of dissolved oxygen and pH in the treatment reactor during typical operation. The model consists of five nonlinear ordinary differential equations describing the time rate o

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Mamun, Shamsuddin Mohammed, Ulfert Focken, and Klaus Becker. "A respirometer system to measure critical and recovery oxygen tensions of fish under simulated diurnal fluctuations in dissolved oxygen." Aquaculture International 21, no. 1 (2012): 31–44. http://dx.doi.org/10.1007/s10499-012-9529-1.

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Thompson, R. L., A. C. Manning, E. Gloor, et al. "In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany." Atmospheric Measurement Techniques 2, no. 2 (2009): 573–91. http://dx.doi.org/10.5194/amt-2-573-2009.

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Abstract. We present 2.5 years (from June 2006 to December 2008) of in-situ measurements of CO2, O2, CH4, CO, N2O and SF6 mixing ratios sampled from 23, 90 and 163 m above ground on the Ochsenkopf tower in the Fichtelgebirge range, Germany (50°01'49" N, 11°48'30" E, 1022 m a.s.l.). In addition to the in-situ measurements, flask samples are taken at Ochsenkopf at approximately weekly intervals and are subsequently analysed for the mixing ratios of the same species, as well as H2, and the stable isotopes, δ13C, δ18O in CO2. The in-situ measurements of CO2 and O2 from 23 m show substantial diurna

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Thompson, R. L., A. C. Manning, E. Gloor, et al. "In-situ measurements of oxygen, carbon monoxide and greenhouse gases from Ochsenkopf tall tower in Germany." Atmospheric Measurement Techniques Discussions 2, no. 3 (2009): 1247–91. http://dx.doi.org/10.5194/amtd-2-1247-2009.

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Abstract. We present 2.5 years of in-situ measurements of CO2, O2, CH4, CO, N2O and SF6 mixing ratios sampled from 23, 90 and 163 m above ground on the Ochsenkopf tower in the Fichtelgebirge range, Germany (50°01´49´´ N, 11°48´30´´ E, 1022 m a.s.l.). In addition to the in-situ measurements, flask samples are taken at Ochsenkopf at approximately weekly intervals and are subsequently analysed for the same species, as well as H2, and the stable isotopes, δ13C, δ18O in CO2. The in-situ measurements of CO2 and O2 from 23 m show substantial diurnal variations that are modulated by biospheric fluxes,

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Graly, Joseph, Joel Harrington, and Neil Humphrey. "Combined diurnal variations of discharge and hydrochemistry of the Isunnguata Sermia outlet, Greenland Ice Sheet." Cryosphere 11, no. 3 (2017): 1131–40. http://dx.doi.org/10.5194/tc-11-1131-2017.

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Abstract. In order to examine daily cycles in meltwater routing and storage in the Isunnguata Sermia outlet of the Greenland Ice Sheet, variations in outlet stream discharge and in major element hydrochemistry were assessed over a 6-day period in July 2013. Over 4 days, discharge was assessed from hourly photography of the outlet from multiple vantages, including where midstream naled ice provided a natural gauge. pH, electrical conductivity, suspended sediment, and major element and anion chemistry were measured in samples of stream water collected every 3 h.Photography and stream observation

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Palshin, N. I., T. V. Efremova, G. E. Zdorovennova, et al. "Diurnal dynamics of dissolved oxygen in the small mesotrophic lake during the under-ice heating period." Известия Русского географического общества 151, no. 4 (2019): 27–39. http://dx.doi.org/10.31857/s0869-6071151427-39.

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The article investigates the dynamics of the dissolved oxygen (DO) content, the water temperature, the chlorophyll «a» and the under-ice irradiation in the small mesotrophic lake during the springtime heating period. All data were obtained from long-term observations using high-precision autonomous equipment. In the convectively mixed layer (CML) were recorded the DO oscillations up to 1 mgO2/l with daily frequency. Assumedly, these fluctuations are due to the daytime intensification of the photosynthesis on the background of under-ice irradiation growth (reaching 120 W/m2 when snow melts from

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Banjongproo, P., and B. Wett. "Mass balance of a wastewater loaded canal system: case study of Bangkok." Water Science and Technology 46, no. 11-12 (2002): 451–56. http://dx.doi.org/10.2166/wst.2002.0777.

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A dynamic water quality model was applied in order to investigate self-purification processes in highly loaded canals in the centre of Bangkok, capital city of Thailand. Oxygen production by aquatic plants induces a significant diurnal variation of the dissolved oxygen concentration. The corresponding profiles of heterotrophic growth and BOD5 concentration demonstrate the limiting impact of oxygen shortage during night time. Both self-purification mechanisms - biological degradation and settling - are considered and water-sediment interactions are calculated. Simulation results and measurement

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KAYABA, Yuichi. "Estimation of reaeration coefficient and metabolism in a stream based on diurnal observation of dissolved oxygen." Japanese Journal of Limnology (Rikusuigaku Zasshi) 66, no. 2 (2005): 93–105. http://dx.doi.org/10.3739/rikusui.66.93.

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Irvine-Fynn, T. D. L., and A. J. Hodson. "Biogeochemistry and dissolved oxygen dynamics at a subglacial upwelling, Midtre Lovénbreen, Svalbard." Annals of Glaciology 51, no. 56 (2010): 41–46. http://dx.doi.org/10.3189/172756411795931903.

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AbstractThere is a growing awareness that biological processes affect solute acquisition in glacial meltwaters. An unprecedented, high-resolution record of dissolved oxygen (DO) in emergent subglacial meltwaters at polythermal Midtre Lovénbreen, Svalbard, is discussed in conjunction with the major-ion chemistry of periodic water samples within the catchment. The subglacial outburst increased solutes passing through the proglacial area and was coupled to a seasonal transition in upwelling character from suboxic waters to those with large diurnal fluctuations in the levels of DO saturation, latt

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Tiedemann, John, James Nickels, and Michael Witty. "Real-Time Water Quality Monitoring Shows Diurnal Variation of Dissolved Oxygen That Contributes to Unsolved Fish Kills." Proceedings of the Water Environment Federation 2009, no. 13 (2009): 3282–91. http://dx.doi.org/10.2175/193864709793953133.

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Karakaya, Nusret, Fatih Evrendilek, Kerem Gungor, and Deniz Onal. "Predicting Diel, Diurnal and Nocturnal Dynamics of Dissolved Oxygen and Chlorophyll-aUsing Regression Models and Neural Networks." CLEAN - Soil, Air, Water 41, no. 9 (2013): 872–77. http://dx.doi.org/10.1002/clen.201200683.

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Bingham, Frederick M., and Roger Lukas. "Seasonal cycles of temperature, salinity and dissolved oxygen observed in the Hawaii Ocean Time-series." Deep Sea Research Part II: Topical Studies in Oceanography 43, no. 2-3 (1996): 199–213. http://dx.doi.org/10.1016/0967-0645(95)00090-9.

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