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Articoli di riviste sul tema "Oceanic mixing"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 28 luglio 2024

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1

Legg, Sonya. "Mixing by Oceanic Lee Waves." Annual Review of Fluid Mechanics 53, no. 1 (January 5, 2021): 173–201. http://dx.doi.org/10.1146/annurev-fluid-051220-043904.

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Oceanic lee waves are generated in the deep stratified ocean by the flow of ocean currents over sea floor topography, and when they break, they can lead to mixing in the stably stratified ocean interior. While the theory of linear lee waves is well established, the nonlinear mechanisms leading to mixing are still under investigation. Tidally driven lee waves have long been observed in the ocean, along with associated mixing, but observations of lee waves forced by geostrophic eddies are relatively sparse and largely indirect. Parameterizations of the mixing due to ocean lee waves are now being

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2

McWilliams, James C. "Oceanic Frontogenesis." Annual Review of Marine Science 13, no. 1 (January 3, 2021): 227–53. http://dx.doi.org/10.1146/annurev-marine-032320-120725.

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Frontogenesis is the fluid-dynamical processes that rapidly sharpen horizontal density gradients and their associated horizontal velocity shears. It is a positive feedback process where the ageostrophic, overturning secondary circulation in the cross-front plane accelerates the frontal sharpening until an arrest occurs through frontal instability and other forms of turbulent mixing. Several well-known types of oceanic frontal phenomena are surveyed, their impacts on oceanic system functioning are assessed, and future research is envisioned.

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3

Zhu, Yuchao, Rong-Hua Zhang, and Jichang Sun. "North Pacific Upper-Ocean Cold Temperature Biases in CMIP6 Simulations and the Role of Regional Vertical Mixing." Journal of Climate 33, no. 17 (September 1, 2020): 7523–38. http://dx.doi.org/10.1175/jcli-d-19-0654.1.

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AbstractSubstantial model biases are still prominent even in the latest CMIP6 simulations; attributing their causes is defined as one of the three main scientific questions addressed in CMIP6. In this paper, cold temperature biases in the North Pacific subtropics are investigated using simulations from the newly released CMIP6 models, together with other related modeling products. In addition, ocean-only sensitivity experiments are performed to characterize the biases, with a focus on the role of oceanic vertical mixing schemes. Based on the Argo-derived diffusivity, idealized vertical diffusi

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4

Whalen, Caitlin. "Measuring ocean mixing: From observing processes to quantifying impacts." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A151. http://dx.doi.org/10.1121/10.0015854.

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The impacts of ocean mixing are varied, ranging from the local across-isopycnal transport of heat, salt, and nutrients, to the global overturning circulation with implications for climate. A full understanding of turbulent mixing, from driving processes to impacts, spans all oceanic time and length scales. Turbulent mixing in the ocean occur on scales less than centimeters and timescales less than hours, yet the processes that drive this turbulence occurs on meters to 100s of km length scales and the impact of the turbulent mixing spans the full range of oceanic spatiotemporal scales. Here, we

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5

Huang, Rui Xin. "Mixing and Energetics of the Oceanic Thermohaline Circulation*." Journal of Physical Oceanography 29, no. 4 (April 1999): 727–46. http://dx.doi.org/10.1175/1520-0485(1999)029<0727:maeoto>2.0.co;2.

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6

Grant, Alan L. M., and Stephen E. Belcher. "Wind-Driven Mixing below the Oceanic Mixed Layer." Journal of Physical Oceanography 41, no. 8 (August 1, 2011): 1556–75. http://dx.doi.org/10.1175/jpo-d-10-05020.1.

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Abstract This study describes the turbulent processes in the upper ocean boundary layer forced by a constant surface stress in the absence of the Coriolis force using large-eddy simulation. The boundary layer that develops has a two-layer structure, a well-mixed layer above a stratified shear layer. The depth of the mixed layer is approximately constant, whereas the depth of the shear layer increases with time. The turbulent momentum flux varies approximately linearly from the surface to the base of the shear layer. There is a maximum in the production of turbulence through shear at the base o

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7

MONAHAN, ADAM HUGH. "CORRELATION EFFECTS IN A SIMPLE STOCHASTIC MODEL OF THE THERMOHALINE CIRCULATION." Stochastics and Dynamics 02, no. 03 (September 2002): 437–62. http://dx.doi.org/10.1142/s0219493702000510.

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A simple model of the thermohaline circulation of the World Ocean is considered, in which fluctuations in internal oceanic mixing and in freshwater forcing are represented by stochastic processes. The effects on the stationary probability density function of correlations between fluctuations in mixing and freshwater forcing, and of finite autocorrelation time in oceanic mixing, are determined using a mixture of analytical and numerical techniques. The quantitative behaviour of the system is found to depend on the strength and correlation character of the noise processes, quite sensitively so i

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8

Heesterman, Aart. "Restoring or maintaining the vertical mixing of oceanic waters." International Journal of Scientific and Research Publications (IJSRP) 11, no. 6 (June 28, 2021): 787–93. http://dx.doi.org/10.29322/ijsrp.11.06.2021.p114102.

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9

Hsu, S. A., Robert Fett, and Paul E. La Violette. "Variations in atmospheric mixing height across oceanic thermal fronts." Journal of Geophysical Research 90, no. C2 (1985): 3211. http://dx.doi.org/10.1029/jc090ic02p03211.

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10

Gibson, Carl H. "Fossil turbulence and intermittency in sampling oceanic mixing processes." Journal of Geophysical Research 92, no. C5 (1987): 5383. http://dx.doi.org/10.1029/jc092ic05p05383.

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11

Chacón-Rebollo, T., M. Gómez-Mármol, and S. Rubino. "Numerical investigation of algebraic oceanic turbulent mixing-layer models." Nonlinear Processes in Geophysics 20, no. 6 (November 6, 2013): 945–54. http://dx.doi.org/10.5194/npg-20-945-2013.

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Abstract. In this paper we investigate the finite-time and asymptotic behaviour of algebraic turbulent mixing-layer models by numerical simulation. We compare the performances given by three different settings of the eddy viscosity. We consider Richardson number-based vertical eddy viscosity models. Two of these are classical algebraic turbulence models usually used in numerical simulations of global oceanic circulation, i.e. the Pacanowski–Philander and the Gent models, while the other one is a more recent model (Bennis et al., 2010) proposed to prevent numerical instabilities generated by ph

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12

MacKinnon, Jennifer A., Zhongxiang Zhao, Caitlin B. Whalen, Amy F. Waterhouse, David S. Trossman, Oliver M. Sun, Louis C. St. Laurent, et al. "Climate Process Team on Internal Wave–Driven Ocean Mixing." Bulletin of the American Meteorological Society 98, no. 11 (November 1, 2017): 2429–54. http://dx.doi.org/10.1175/bams-d-16-0030.1.

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Abstract Diapycnal mixing plays a primary role in the thermodynamic balance of the ocean and, consequently, in oceanic heat and carbon uptake and storage. Though observed mixing rates are on average consistent with values required by inverse models, recent attention has focused on the dramatic spatial variability, spanning several orders of magnitude, of mixing rates in both the upper and deep ocean. Away from ocean boundaries, the spatiotemporal patterns of mixing are largely driven by the geography of generation, propagation, and dissipation of internal waves, which supply much of the power

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13

Fuhlbrügge, S., B. Quack, S. Tegtmeier, E. Atlas, H. Hepach, Q. Shi, S. Raimund, and K. Krüger. "The contribution of oceanic halocarbons to marine and free troposphere air over the tropical West Pacific." Atmospheric Chemistry and Physics Discussions 15, no. 13 (July 2, 2015): 17887–943. http://dx.doi.org/10.5194/acpd-15-17887-2015.

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Abstract. Emissions of halogenated very short lived substances (VSLS) from the tropical oceans contribute to the atmospheric halogen budget and affect tropospheric and stratospheric ozone. Here we investigate the contribution of natural oceanic VSLS emissions to the Marine Atmospheric Boundary Layer (MABL) and their transport into the Free Troposphere (FT) over the tropical West Pacific. The study concentrates in particular on ship and aircraft measurements of the VSLS bromoform, dibromomethane and methyl iodide and meteorological parameters during the SHIVA (Stratospheric Ozone: Halogen Impac

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14

Li, J., Z. Wang, G. Zhuang, G. Luo, Y. Sun, and Q. Wang. "Mixing of Asian mineral dust with anthropogenic pollutants and its impact on regional atmospheric environmental and oceanic biogeochemical cycles over East Asia: a model case study of a super-duststorm in March 2010." Atmospheric Chemistry and Physics Discussions 12, no. 1 (January 27, 2012): 2743–82. http://dx.doi.org/10.5194/acpd-12-2743-2012.

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Abstract. Mixing of Asian mineral dust with anthropogenic pollutants allows pollutants (e.g. sulfate and nitrate) to be transported over longer distances (e.g. to the northern Pacific, even to North America) along with dust particles. This mixing therefore affects the atmospheric and oceanic environment at local, regional and even continental scales. In this study, we used a three-dimensional regional chemical transport model (NAQPMS) to examine the degree of mixing between Asian mineral dust and anthropogenic pollutants in a super-duststorm event during 19–22 March 2010. Influences of the mix

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15

Li, J., Z. Wang, G. Zhuang, G. Luo, Y. Sun, and Q. Wang. "Mixing of Asian mineral dust with anthropogenic pollutants over East Asia: a model case study of a super-duststorm in March 2010." Atmospheric Chemistry and Physics 12, no. 16 (August 21, 2012): 7591–607. http://dx.doi.org/10.5194/acp-12-7591-2012.

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Abstract. Mixing of Asian mineral dust with anthropogenic pollutants allows pollutants (e.g. sulfate and nitrate) to be transported over longer distances (e.g. to the northern Pacific, even to North America) along with dust particles. This mixing therefore affects the atmospheric and oceanic environment at local, regional and even continental scales. In this study, we used a three-dimensional regional chemical transport model (Nested Air Quality Predicting Modeling System, NAQPMS) to examine the degree of mixing between Asian mineral dust and anthropogenic pollutants in a super-duststorm event

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16

Abarzhi, S. I., and K. R. Sreenivasan. "Turbulent mixing and beyond." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, no. 1916 (April 13, 2010): 1539–46. http://dx.doi.org/10.1098/rsta.2010.0021.

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Turbulence is a supermixer. Turbulent mixing has immense consequences for physical phenomena spanning astrophysical to atomistic scales under both high- and low-energy-density conditions. It influences thermonuclear fusion in inertial and magnetic confinement systems; governs dynamics of supernovae, accretion disks and explosions; dominates stellar convection, planetary interiors and mantle-lithosphere tectonics; affects premixed and non-premixed combustion; controls standard turbulent flows (wall-bounded and free—subsonic, supersonic as well as hypersonic); as well as atmospheric and oceanic

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17

Fu, Hongli, Jinkun Yang, Wei Li, Xinrong Wu, Guijun Han, Yuanfu Xie, Shaoqing Zhang, Xuefeng Zhang, Yingzhi Cao, and Xiaoshuang Zhang. "A Potential Density Gradient Dependent Analysis Scheme for Ocean Multiscale Data Assimilation." Advances in Meteorology 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/9315601.

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This study addresses how to maintain oceanic mixing along potential density surface in ocean data assimilation (ODA). It is well known that the oceanic mixing across the potential density surface is much weaker than that along the potential density surface. However, traditional ODA schemes allow the mixing across the potential density surface and thus may result in extra assimilation errors. Here, a new ODA scheme that uses potential density gradient information of the model background to rescale observational adjustment is designed to improve the quality of assimilation. The new scheme has be

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18

Gao, Yu, Igor Kamenkovich, and Natalie Perlin. "Origins of mesoscale mixed-layer depth variability in the Southern Ocean." Ocean Science 19, no. 3 (May 11, 2023): 615–27. http://dx.doi.org/10.5194/os-19-615-2023.

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Abstract. Mixed-layer depth (MLD) exhibits significant variability, which is important for atmosphere–ocean exchanges of heat and atmospheric gases. The origins of the mesoscale MLD variability in the Southern Ocean are studied here in an idealised regional ocean–atmosphere model (ROAM). The main conclusion from the analysis of the upper-ocean buoyancy budget is that, while the atmospheric forcing and oceanic vertical mixing, on average, induce the mesoscale variability of MLD, the three-dimensional oceanic advection of buoyancy counteracts and partially balances these atmosphere-induced verti

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19

HOLLAND, DAVID M., RODOLFO R. ROSALES, DAN STEFANICA, and ESTEBAN G. TABAK. "Internal hydraulic jumps and mixing in two-layer flows." Journal of Fluid Mechanics 470 (October 31, 2002): 63–83. http://dx.doi.org/10.1017/s002211200200188x.

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Internal hydraulic jumps in two-layer flows are studied, with particular emphasis on their role in entrainment and mixing. For highly entraining internal jumps, a new closure is proposed for the jump conditions. The closure is based on two main assumptions: (i) most of the energy dissipated at the jump goes into turbulence, and (ii) the amount of turbulent energy that a stably stratified flow may contain without immediately mixing further is bounded by a measure of the stratification. As a consequence of this closure, surprising bounds emerge, for example on the amount of entrainment that may

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20

Mcphee, Miles G. "On the Turbulent Mixing Length in the Oceanic Boundary Layer." Journal of Physical Oceanography 24, no. 9 (September 1994): 2014–31. http://dx.doi.org/10.1175/1520-0485(1994)024<2014:ottmli>2.0.co;2.

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21

Odier, Philippe, Jun Chen, and Robert E. Ecke. "Entrainment and mixing in a laboratory model of oceanic overflow." Journal of Fluid Mechanics 746 (April 4, 2014): 498–535. http://dx.doi.org/10.1017/jfm.2014.104.

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AbstractWe present experimental measurements of a wall-bounded gravity current, motivated by characterizing natural gravity currents such as oceanic overflows. We use particle image velocimetry and planar laser-induced fluorescence to simultaneously measure the velocity and density fields as they evolve downstream of the initial injection from a turbulent channel flow onto a plane inclined at$10^\circ $with respect to horizontal. The turbulence level of the input flow is controlled by injecting velocity fluctuations upstream of the output nozzle. The initial Reynolds number based on the Taylor

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22

Nishioka, Jun, Takeshi Nakatsuka, Yutaka W. Watanabe, Ichiro Yasuda, Kenshi Kuma, Hiroshi Ogawa, Naoto Ebuchi, et al. "Intensive mixing along an island chain controls oceanic biogeochemical cycles." Global Biogeochemical Cycles 27, no. 3 (September 2013): 920–29. http://dx.doi.org/10.1002/gbc.20088.

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23

Mamberti, Marc, Henriette Lapierre, Delphine Bosch, Etienne Jaillard, Jean Hernandez, and Mireille Polvé. "The Early Cretaceous San Juan Plutonic Suite, Ecuador: a magma chamber in an oceanic plateau?" Canadian Journal of Earth Sciences 41, no. 10 (October 1, 2004): 1237–58. http://dx.doi.org/10.1139/e04-060.

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Sections through an oceanic plateau are preserved in tectonic slices in the Western Cordillera of Ecuador (South America). The San Juan section is a sequence of maficultramafic cumulates. To establish that these plutonic rocks formed in an oceanic plateau setting, we have developed criteria that discriminate intrusions of oceanic plateaus from those of other tectonic settings. The mineralogy and crystallization sequence of the cumulates are similar to those of intra-plate magmas. Clinopyroxene predominates throughout, and orthopyroxene is only a minor component. Rocks of intermediate composit

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24

Booge, Dennis, Jerry F. Tjiputra, Dirk J. L. Olivié, Birgit Quack, and Kirstin Krüger. "Natural marine bromoform emissions in the fully coupled ocean–atmosphere model NorESM2." Earth System Dynamics 15, no. 3 (June 21, 2024): 801–16. http://dx.doi.org/10.5194/esd-15-801-2024.

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Abstract. Oceanic bromoform (CHBr3) is an important precursor of atmospheric bromine. Although highly relevant for the future halogen burden and ozone layer in the stratosphere, global CHBr3 production in the ocean and its emissions are still poorly constrained in observations and are mostly neglected in climate models. Here, we newly implement marine CHBr3 in the second version of the state-of-the-art Norwegian Earth System Model (NorESM2) with fully coupled interactions of ocean, sea ice, and atmosphere. Our results are validated using oceanic and atmospheric observations from the HalOcAt (H

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25

Kantha, Lakshmi, and Hubert Luce. "Mixing Coefficient in Stably Stratified Flows." Journal of Physical Oceanography 48, no. 11 (November 2018): 2649–65. http://dx.doi.org/10.1175/jpo-d-18-0139.1.

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AbstractTurbulent mixing in the interior of the oceans is not as well understood as mixing in the oceanic boundary layers. Mixing in the generally stably stratified interior is primarily, although not exclusively, due to intermittent shear instabilities. Part of the energy extracted by the Reynolds stresses acting on the mean shear is expended in increasing the potential energy of the fluid column through a buoyancy flux, while most of it is dissipated. The mixing coefficient χm, the ratio of the buoyancy flux to the dissipation rate of turbulence kinetic energy ε, is an important parameter, s

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26

Williams, J. E., G. Le Bras, A. Kukui, H. Ziereis, and C. A. M. Brenninkmeijer. "The impact of the chemical production of methyl nitrate from the NO + CH<sub>3</sub>O<sub>2</sub> reaction on the global distributions of alkyl nitrates, nitrogen oxides and tropospheric ozone: a global modeling study." Atmospheric Chemistry and Physics Discussions 13, no. 8 (August 2, 2013): 20111–63. http://dx.doi.org/10.5194/acpd-13-20111-2013.

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Abstract. The formation, abundance and distribution of organic nitrates are relevant for determining the production efficiency and resident mixing ratios of tropospheric ozone (O3) at both regional and global scales. Here we investigate the effect of applying the recently measured direct chemical production of methyl nitrate (CH3ONO2) during NOx recycling involving the methyl-peroxy radical on the global tropospheric distribution of CH3ONO2 and the perturbations introduced towards tropospheric NOx and O3 using the TM5 global chemistry transport model. By comparing against numerous observations

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Sullivan, Peter P., and James C. McWilliams. "Oceanic Frontal Turbulence." Journal of Physical Oceanography 54, no. 2 (February 2024): 333–58. http://dx.doi.org/10.1175/jpo-d-23-0033.1.

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Abstract Upper-ocean turbulence results from a complex set of interactions between submesoscale turbulence and local boundary layer processes. The interaction between larger-scale currents and turbulent fluctuations is two-way: large-scale shearing motions generate turbulence, and the resulting coherent turbulent fluxes of momentum and buoyancy feed back onto the larger flow. Here we examine the evolution and role of turbulence in the intensification, instability, arrest, and decay (i.e., the life cycle) of a dense filament undergoing frontogenesis in the upper-ocean boundary layer, i.e., cold

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Thomas, Jordan, Darryn Waugh, and Anand Gnanadesikan. "Relationship between Ocean Carbon and Heat Multidecadal Variability." Journal of Climate 31, no. 4 (February 2018): 1467–82. http://dx.doi.org/10.1175/jcli-d-17-0134.1.

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The global ocean serves as a critical sink for anthropogenic carbon and heat. While significant effort has been dedicated to quantifying the oceanic uptake of these quantities, less research has been conducted on the mechanisms underlying decadal-to-centennial variability in oceanic heat and carbon. Therefore, little is understood about how much such variability may have obscured or reinforced anthropogenic change. Here the relationship between oceanic heat and carbon content is examined in a suite of coupled climate model simulations that use different parameterization settings for mesoscale

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Brischoux, François, Cédric Cotté, Harvey B. Lillywhite, Frédéric Bailleul, Maxime Lalire, and Philippe Gaspar. "Oceanic circulation models help to predict global biogeography of pelagic yellow-bellied sea snake." Biology Letters 12, no. 8 (August 2016): 20160436. http://dx.doi.org/10.1098/rsbl.2016.0436.

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It is well recognized that most marine vertebrates, and especially tetrapods, precisely orient and actively move in apparently homogeneous oceanic environments. Here, we investigate the presumptive role of oceanic currents in biogeographic patterns observed in a secondarily marine tetrapod, the yellow-bellied sea snake ( Hydrophis [ Pelamis ] platurus ). State-of-the-art world ocean circulation models show how H. platurus , the only pelagic species of sea snake, can potentially exploit oceanic currents to disperse and maintain population mixing between localities that spread over two-thirds of

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Bennis, Anne-Claire, Tomas Chacón Rebollo, Macarena Gómez Mármol, and Roger Lewandowski. "Numerical modelling of algebraic closure models of oceanic turbulent mixing layers." ESAIM: Mathematical Modelling and Numerical Analysis 44, no. 6 (March 17, 2010): 1255–77. http://dx.doi.org/10.1051/m2an/2010025.

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Chacón Rebollo, T., M. Gómez Mármol, and S. Rubino. "Analysis of numerical stability of algebraic oceanic turbulent mixing layer models." Applied Mathematical Modelling 38, no. 24 (December 2014): 5836–57. http://dx.doi.org/10.1016/j.apm.2014.04.050.

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Gnanadesikan, Anand, Marie‐Aude Pradal, and Ryan Abernathey. "Isopycnal mixing by mesoscale eddies significantly impacts oceanic anthropogenic carbon uptake." Geophysical Research Letters 42, no. 11 (June 2, 2015): 4249–55. http://dx.doi.org/10.1002/2015gl064100.

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Prakash, Kumar Ravi, Tanuja Nigam, and Vimlesh Pant. "Estimation of oceanic subsurface mixing under a severe cyclonic storm using a coupled atmosphere–ocean–wave model." Ocean Science 14, no. 2 (April 3, 2018): 259–72. http://dx.doi.org/10.5194/os-14-259-2018.

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Abstract. A coupled atmosphere–ocean–wave model was used to examine mixing in the upper-oceanic layers under the influence of a very severe cyclonic storm Phailin over the Bay of Bengal (BoB) during 10–14 October 2013. The coupled model was found to improve the sea surface temperature over the uncoupled model. Model simulations highlight the prominent role of cyclone-induced near-inertial oscillations in subsurface mixing up to the thermocline depth. The inertial mixing introduced by the cyclone played a central role in the deepening of the thermocline and mixed layer depth by 40 and 15 m, res

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Löptien, Ulrike, and Heiner Dietze. "Reciprocal bias compensation and ensuing uncertainties in model-based climate projections: pelagic biogeochemistry versus ocean mixing." Biogeosciences 16, no. 9 (May 6, 2019): 1865–81. http://dx.doi.org/10.5194/bg-16-1865-2019.

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Abstract. Anthropogenic emissions of greenhouse gases such as CO2 and N2O impinge on the Earth system, which in turn modulates atmospheric greenhouse gas concentrations. The underlying feedback mechanisms are complex and, at times, counterintuitive. So-called Earth system models have recently matured to standard tools tailored to assess these feedback mechanisms in a warming world. Applications for these models range from being targeted at basic process understanding to the assessment of geo-engineering options. A problem endemic to all these applications is the need to estimate poorly known m

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Fuhlbrügge, Steffen, Birgit Quack, Susann Tegtmeier, Elliot Atlas, Helmke Hepach, Qiang Shi, Stefan Raimund, and Kirstin Krüger. "The contribution of oceanic halocarbons to marine and free tropospheric air over the tropical West Pacific." Atmospheric Chemistry and Physics 16, no. 12 (June 21, 2016): 7569–85. http://dx.doi.org/10.5194/acp-16-7569-2016.

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Abstract. Emissions of halogenated very-short-lived substances (VSLSs) from the oceans contribute to the atmospheric halogen budget and affect tropospheric and stratospheric ozone. Here, we investigate the contribution of natural oceanic VSLS emissions to the marine atmospheric boundary layer (MABL) and their transport into the free troposphere (FT) over the tropical West Pacific. The study concentrates on bromoform, dibromomethane and methyl iodide measured on ship and aircraft during the SHIVA (Stratospheric Ozone: Halogen Impacts in a Varying Atmosphere) campaign in the South China and Sulu

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Károly, György, Rudolf Dániel Prokaj, István Scheuring, and Tamás Tél. "Climate change in a conceptual atmosphere–phytoplankton model." Earth System Dynamics 11, no. 3 (July 16, 2020): 603–15. http://dx.doi.org/10.5194/esd-11-603-2020.

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Abstract. We develop a conceptual coupled atmosphere–phytoplankton model by combining the Lorenz'84 general circulation model and the logistic population growth model under the condition of a climate change due to a linear time dependence of the strength of anthropogenic atmospheric forcing. The following types of couplings are taken into account: (a) the temperature modifies the total biomass of phytoplankton via the carrying capacity; (b) the extraction of carbon dioxide by phytoplankton slows down the speed of climate change; (c) the strength of mixing/turbulence in the oceanic mixing layer

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Byrne, David, Lukas Papritz, Ivy Frenger, Matthias Münnich, and Nicolas Gruber. "Atmospheric Response to Mesoscale Sea Surface Temperature Anomalies: Assessment of Mechanisms and Coupling Strength in a High-Resolution Coupled Model over the South Atlantic*." Journal of the Atmospheric Sciences 72, no. 5 (May 1, 2015): 1872–90. http://dx.doi.org/10.1175/jas-d-14-0195.1.

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Abstract Many aspects of the coupling between the ocean and atmosphere at the mesoscale (on the order of 20–100 km) remain unknown. While recent observations from the Southern Ocean revealed that circular fronts associated with oceanic mesoscale eddies leave a distinct imprint on the overlying wind, cloud coverage, and rain, the mechanisms responsible for explaining these atmospheric changes are not well established. Here the atmospheric response above mesoscale ocean eddies is investigated utilizing a newly developed coupled atmosphere–ocean regional model [Consortium for Small-Scale Modeling

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Pasquero, Claudia, and Eli Tziperman. "Statistical Parameterization of Heterogeneous Oceanic Convection." Journal of Physical Oceanography 37, no. 2 (February 1, 2007): 214–29. http://dx.doi.org/10.1175/jpo3008.1.

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Abstract A statistical convective adjustment scheme is proposed that attempts to account for the effects of mesoscale and submesoscale variability of temperature and salinity typically observed in the oceanic convective regions. Temperature and salinity in each model grid box are defined in terms of their mean, variance, and mutual correlations. Subgrid-scale instabilities lead to partial mixing between different layers in the water column. This allows for a smooth transition between the only two states (convection on and convection off) allowed in standard convective adjustment schemes. The a

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39

Xu, Suqing, Keyhong Park, Yanmin Wang, Liqi Chen, Di Qi, and Bingrui Li. "Variations in the summer oceanic <i>p</i>CO<sub>2</sub> and carbon sink in Prydz Bay using the self-organizing map analysis approach." Biogeosciences 16, no. 3 (February 13, 2019): 797–810. http://dx.doi.org/10.5194/bg-16-797-2019.

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Abstract. This study applies a neural network technique to produce maps of oceanic surface pCO2 in Prydz Bay in the Southern Ocean on a weekly 0.1∘ longitude × 0.1∘ latitude grid based on in situ measurements obtained during the 31st CHINARE cruise from February to early March 2015. This study area was divided into three regions, namely, the “open-ocean” region, “sea-ice” region and “shelf” region. The distribution of oceanic pCO2 was mainly affected by physical processes in the open-ocean region, where mixing and upwelling were the main controls. In the sea-ice region, oceanic pCO2 changed sh

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40

Luo, G., та F. Yu. "A numerical evaluation of global oceanic emissions of α-pinene and isoprene". Atmospheric Chemistry and Physics 10, № 4 (19 лютого 2010): 2007–15. http://dx.doi.org/10.5194/acp-10-2007-2010.

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Abstract. A numerical evaluation of global oceanic emissions of α-pinene and isoprene based on both "bottom-up" and "top-down" methods is presented. We infer that the global "bottom-up" oceanic emissions of α-pinene and isoprene are 0.013 TgC yr−1 and 0.32 TgC yr−1, respectively. By constraining global chemistry model simulations with the shipborne measurement of Organics over the Ocean Modifying Particles in both Hemispheres summer cruise, we derived the global "top-down" oceanic α-pinene source of 29.5 TgC yr−1 and isoprene source of 11.6 TgC yr−1. Both the "bottom-up" and "top-down" values

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41

St. Laurent, Louis, and Harper Simmons. "Estimates of Power Consumed by Mixing in the Ocean Interior." Journal of Climate 19, no. 19 (October 1, 2006): 4877–90. http://dx.doi.org/10.1175/jcli3887.1.

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Abstract (sommario):

Abstract Much attention has focused on the power required for driving mixing processes in the ocean interior, the thermohaline circulation, and the related meridional overturning circulation (MOC). Recent estimates range from roughly 0.5 to 2 TW (1 TW = 1 × 1012 W), based on differing arguments for the closure of the MOC mass budget. While these values are both O(1) TW, the thermodynamic implications of the estimates are significantly different. In addition, these numbers represent an integral constraint on the global circulation, and the apparent discrepancy merits careful examination. Throug

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42

ALDANMAZ, E., M. K. YALINIZ, A. GÜCTEKIN, and M. C. GÖNCÜOĞLU. "Geochemical characteristics of mafic lavas from the Neotethyan ophiolites in western Turkey: implications for heterogeneous source contribution during variable stages of ocean crust generation." Geological Magazine 145, no. 1 (November 30, 2007): 37–54. http://dx.doi.org/10.1017/s0016756807003986.

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AbstractThe Late Triassic to Late Cretaceous age mafic lavas from the Neotethyan suture zone ophiolites in western Turkey exhibit a wide diversity of geochemical signatures, indicating derivation from extremely heterogeneous mantle sources. The rocks as a whole can be divided into three broad subdivisions based on their bulk-rock geochemical characteristics: (1) mid-ocean ridge basalts (MORB) that range in composition from light rare earth element (LREE)-depleted varieties (N-MORB; (La/Sm)N<1) through transitional MORB to LREE enriched types (E-MORB; (La/Sm)N>1); (2) the ocean island bas

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43

Gačić, Miroslav, and Manuel Bensi. "Ocean Exchange and Circulation." Water 12, no. 3 (March 20, 2020): 882. http://dx.doi.org/10.3390/w12030882.

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The great spatial and temporal variability, which characterizes the marine environment, requires a huge effort to be observed and studied properly since changes in circulation and mixing processes directly influence the variability of the physical and biogeochemical properties. A multi-platform approach and a collaborative effort, in addition to optimizing both data collection and quality, is needed to bring the scientific community to more efficient monitoring and predicting of the world ocean processes. This Special Issue consists of nine original scientific articles that address oceanic cir

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44

Sokolov, Andrei P., Chris E. Forest, and Peter H. Stone. "Comparing Oceanic Heat Uptake in AOGCM Transient Climate Change Experiments." Journal of Climate 16, no. 10 (May 15, 2003): 1573–82. http://dx.doi.org/10.1175/1520-0442-16.10.1573.

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Abstract The transient response of both surface air temperature and deep ocean temperature to an increasing external forcing strongly depends on climate sensitivity and the rate of the heat mixing into the deep ocean, estimates for both of which have large uncertainty. In this paper a method for estimating rates of oceanic heat uptake for coupled atmosphere–ocean general circulation models from results of transient climate change simulations is described. For models considered in this study, the estimates vary by a factor of 2½. Nevertheless, values of oceanic heat uptake for all models fall i

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45

Fuhlbrügge, Steffen, Birgit Quack, Elliot Atlas, Alina Fiehn, Helmke Hepach, and Kirstin Krüger. "Meteorological constraints on oceanic halocarbons above the Peruvian upwelling." Atmospheric Chemistry and Physics 16, no. 18 (September 29, 2016): 12205–17. http://dx.doi.org/10.5194/acp-16-12205-2016.

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Abstract. During a cruise of R/V METEOR in December 2012 the oceanic sources and emissions of various halogenated trace gases and their mixing ratios in the marine atmospheric boundary layer (MABL) were investigated above the Peruvian upwelling. This study presents novel observations of the three very short lived substances (VSLSs) – bromoform, dibromomethane and methyl iodide – together with high-resolution meteorological measurements, Lagrangian transport and source–loss calculations. Oceanic emissions of bromoform and dibromomethane were relatively low compared to other upwelling regions, w

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46

Stevens, C. L., C. L. Stewart, N. J. Robinson, M. J. M. Williams, and T. G. Haskell. "Flow and mixing around a glacier tongue." Ocean Science Discussions 7, no. 4 (August 11, 2010): 1439–67. http://dx.doi.org/10.5194/osd-7-1439-2010.

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Abstract. A glacier tongue floating in the coastal ocean presents a significant obstacle to the local flow and influences oceanic mixing and transport processes. Here ocean shear microstructure observations at a glacier tongue side-wall show tidally-induced flow pulses and vortices as well as concomitant mixing. Flow speeds within the pulses reached around three times that of the ambient tidal flow amplitude and generated vertical velocity shear as large as 3×10−3 s−1. During the maximum flow period turbulent energy dissipation rates reached a maximum of 10−5 m2 s−3, around three decades great

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47

Williams, J. E., G. Le Bras, A. Kukui, H. Ziereis, and C. A. M. Brenninkmeijer. "The impact of the chemical production of methyl nitrate from the NO + CH<sub>3</sub>O<sub>2</sub> reaction on the global distributions of alkyl nitrates, nitrogen oxides and tropospheric ozone: a global modelling study." Atmospheric Chemistry and Physics 14, no. 5 (March 7, 2014): 2363–82. http://dx.doi.org/10.5194/acp-14-2363-2014.

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Abstract. The formation, abundance and distribution of organic nitrates are relevant for determining the production efficiency and resident mixing ratios of tropospheric ozone (O3) on both regional and global scales. Here we investigate the effect of applying the recently measured direct chemical production of methyl nitrate (CH3ONO2) during NOx recycling involving the methyl-peroxy radical on the global tropospheric distribution of CH3ONO2 and the perturbations introduced towards tropospheric NOx and O3 using the TM5 global chemistry transport model. By comparisons against numerous observatio

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48

Fiehn, Alina, Birgit Quack, Irene Stemmler, Franziska Ziska, and Kirstin Krüger. "Importance of seasonally resolved oceanic emissions for bromoform delivery from the tropical Indian Ocean and west Pacific to the stratosphere." Atmospheric Chemistry and Physics 18, no. 16 (August 21, 2018): 11973–90. http://dx.doi.org/10.5194/acp-18-11973-2018.

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Abstract (sommario):

Abstract. Oceanic very short-lived substances (VSLSs), such as bromoform (CHBr3), contribute to stratospheric halogen loading and, thus, to ozone depletion. However, the amount, timing, and region of bromine delivery to the stratosphere through one of the main entrance gates, the Indian summer monsoon circulation, are still uncertain. In this study, we created two bromoform emission inventories with monthly resolution for the tropical Indian Ocean and west Pacific based on new in situ bromoform measurements and novel ocean biogeochemistry modeling. The mass transport and atmospheric mixing rat

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49

Zhang, Xiaoqian, David C. Smith, Steven F. DiMarco, and Robert D. Hetland. "A Numerical Study of Sea-Breeze-Driven Ocean Poincare Wave Propagation and Mixing near the Critical Latitude." Journal of Physical Oceanography 40, no. 1 (January 1, 2010): 48–66. http://dx.doi.org/10.1175/2009jpo4216.1.

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Abstract (sommario):

Abstract Near the vicinity of 30° latitude, the coincidence of the period of sea breeze and the inertial period of the ocean leads to a maximum near-inertial ocean response to sea breeze. This produces a propagating inertial internal (Poincare) wave response that transfers energy laterally away from the coast and provides significant vertical mixing. In this paper, the latitudinal dependence of this wave propagation and its associated vertical mixing are investigated primarily using a nonlinear numerical ocean model. Three-dimensional idealized simulations show that the coastal oceanic respons

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50

Ku, Teh-Lung, and Shangde Luo. "New appraisal of radium 226 as a large-scale oceanic mixing tracer." Journal of Geophysical Research 99, no. C5 (1994): 10255. http://dx.doi.org/10.1029/94jc00089.

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