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Constraining Bubble Dynamics And Mixing With Dissolved Gases: Implications For Productivity Measurements By Oxygen Mass Balance, Roberta C. Hamme, Steven R. Emerson
Constraining Bubble Dynamics And Mixing With Dissolved Gases: Implications For Productivity Measurements By Oxygen Mass Balance, Roberta C. Hamme, Steven R. Emerson
Journal of Marine Research
We used a dynamic mixed layer model to determine carbon export by the oxygen mass balance method from a time series of O2/Ar, N2/Ar and Ne measurements collected at station ALOHA near Hawaii from July 2000 to June 2001. The inert gas measurements constrain the flux of oxygen into the mixed layer from small, collapsing bubbles (injection) to be greater than or equal to the flux from larger bubbles (exchange), with mean estimates of the ratio in the range of 1–2. We also show that monthly observations of temperature and inert gases cannot constrain the rate …
Generalized Inversion Of The Gent-Cane Model Of The Tropical Pacific With Tropical Atmosphere-Ocean (Tao) Data, A. F. Bennett, B. S. Chua, H. E. Ngodock, D. E. Harrison, M. J. Mcphaden
Generalized Inversion Of The Gent-Cane Model Of The Tropical Pacific With Tropical Atmosphere-Ocean (Tao) Data, A. F. Bennett, B. S. Chua, H. E. Ngodock, D. E. Harrison, M. J. Mcphaden
Journal of Marine Research
We here describe the results of our latest effort to reanalyze TAO monthly mean surface and subsurface temperature observations constrained by a tropical Pacific ocean model, and simultaneously to evaluate the physical consistency of the observations and the model. Both tasks are executed by weak–constraint, four–dimensional variational assimilation of the observations into the model. In this study our reanalysis employs the reduced–gravity Gent–Cane model, combined with the 'KPP–interior' parameterization of vertical turbulent fluxes. With the limited vertical resolution adopted in previous studies of this model, the 'W4DVAR' or inverse method fails to produce an acceptable reanalysis, as the dynamical residuals …
Understanding The Influence Of Rossby Waves On Surface Chlorophyll Concentrations In The North Atlantic Ocean, G. Charria, I. Dadou, P. Cipollini, M. Drévillon, P. De Mey, V. Garçon
Understanding The Influence Of Rossby Waves On Surface Chlorophyll Concentrations In The North Atlantic Ocean, G. Charria, I. Dadou, P. Cipollini, M. Drévillon, P. De Mey, V. Garçon
Journal of Marine Research
The variability (in space and time) of westward propagating Rossby waves is analyzed with a wavelet method between 10N and 40N in the North Atlantic Ocean using two remotely sensed data sets (Sea Level Anomalies – SLA and surface chlorophyll-a concentrations) in order to better understand the waves' characteristics and their impacts on the chlorophyll distribution. Signals with wavelengths between ∼ 500 km and ∼ 1000 km with ∼ 4- to ∼ 24-month periods were detected and identified as the first baroclinic mode of Rossby waves. The spatial and temporal information has also highlighted a particular situation in 1998 …
Estimation Of Nonlocal Turbulent Mixing Parameters Derived From Microstructure Profiles, Jaume Piera, Ruben Quesada, Jordi Catalan
Estimation Of Nonlocal Turbulent Mixing Parameters Derived From Microstructure Profiles, Jaume Piera, Ruben Quesada, Jordi Catalan
Journal of Marine Research
The present study proposes a new method for estimating nonlocal mixing parameters from microstructure data processing. The method could be particularly useful in studies of biological-physical interactions at small scale because it overcomes some of the limitations of the eddy diffusivity concept when dealing with the complex vertical pattern of biological and chemical tracers. The proposed method obtains empirically the coefficients of the transilient matrix, this being the discrete descriptor used in nonlocal mixing closure. The estimation is based on microstructure data analysis, in particular Thorpe displacement profiles, and includes three main steps: turbulent patch identification within each profile, turbulent …
Shear And Turbulence Production Across Subtidal Channels, David K. Ralston, Mark T. Stacey
Shear And Turbulence Production Across Subtidal Channels, David K. Ralston, Mark T. Stacey
Journal of Marine Research
In intertidal regions with subtidal channels, effects of bathymetry on overlying flow vary greatly with tidal stage. Around low water when mudflats and marsh are exposed, flow is constrained to channels, but when water depths are greater, tidal forcing may not necessarily be aligned with meandering channel axes. Flow across the channel can generate strong shear and turbulence at the elevation of the channel banks and can significantly increase turbulent energy in the middle of the water column. Field observations in a mudflat channel of San Francisco Bay indicate that cross-channel shear regularly occurs there early in ebb tides. With …
Physical-Biological Interactions And Their Effect On Phytoplankton Blooms In Fjords And Near-Coastal Waters, Lars Erik Holmedal, Torbjørn Utnes
Physical-Biological Interactions And Their Effect On Phytoplankton Blooms In Fjords And Near-Coastal Waters, Lars Erik Holmedal, Torbjørn Utnes
Journal of Marine Research
A one-dimensional flow model which accounts for turbulence and stratification in the upper ocean has been applied in conjunction with a one-dimensional production-advection-diffusion model to predict the initial evolution of the phytoplankton biomass concentration under given biological and physical conditions. Here the stratification is caused by the salinity which is modeled by a one-dimensional diffusion equation; the density is related to the salinity by a linear relation (state equation). The resulting one-dimensional model has been applied to investigate how local physical conditions affect the initiation of phytoplankton blooms in nutrition rich waters characterized by wind driven currents and salinity stratification. …
Transfer Of Particulate Matter From The Northwestern Mediterranean Continental Margin: Variability And Controlling Factors, M. Guarracino, B. Barnier, P. Marsaleix, X. Durrieu De Madron, A. Monaco, K. Escoubeyrou, J. C. Marty
Transfer Of Particulate Matter From The Northwestern Mediterranean Continental Margin: Variability And Controlling Factors, M. Guarracino, B. Barnier, P. Marsaleix, X. Durrieu De Madron, A. Monaco, K. Escoubeyrou, J. C. Marty
Journal of Marine Research
Long-term observations of monthly downward particle fluxes and hourly currents and temperature were initiated in 1993 in two canyons of the continental margin of the Gulf of Lion. The goals of this survey were to estimate its contribution to the CO2 global budget and to understand the role of forcing factors in the control of present-day particle exchange across this margin. A previous statistical analysis of the long-term time series suggested that variability in the transfer of particulate matter to the deep ocean could be the result of the effect of the meandering of the Northern Current and by …
Simulation And Energy Partition Of The Flow Through Paso Galvarino, Chile, Michael W. Stacey, Arnoldo Valle-Levinson
Simulation And Energy Partition Of The Flow Through Paso Galvarino, Chile, Michael W. Stacey, Arnoldo Valle-Levinson
Journal of Marine Research
Paso Galvarino is a constriction in Seno Ventisquero, a tidally-energetic Chilean fjord. The pass is about 1500 m long and constricts in width by about 90 % near its sill, which has a depth of about 8 m. A laterally-averaged numerical model is compared to ADCP and backscatter observations of the hydraulic flow near the sill, during maximum flood, the slack tide after the flood, maximum ebb, and the slack tide after the ebb. The model is also used to examine how the energy flux into the fjord is partitioned in the region of the constriction. Energy is removed from …
Quantifying Seasonal Air-Sea Gas Exchange Processes Using Noble Gas Time-Series: A Design Experiment, Rachel H. R. Stanley, William J. Jenkins, Scott C. Doney
Quantifying Seasonal Air-Sea Gas Exchange Processes Using Noble Gas Time-Series: A Design Experiment, Rachel H. R. Stanley, William J. Jenkins, Scott C. Doney
Journal of Marine Research
A multi-year time-series of measurements of five noble gases (He, Ne, Ar, Kr, and Xe) at a subtropical ocean location may allow quantification of air-sea gas exchange parameters with tighter constraints than is currently available by other methods. We have demonstrated this using a one-dimensional upper ocean model forced by 6-hourly NCEP reanalysis winds and heat flux for the Sargasso Sea near Bermuda. We performed ensemble model runs to characterize the response of the modeled noble gas saturation anomalies to a range of air-sea gas exchange parameters. We then used inverse calculations to quantify the sensitivity of the parameters to …
An Estuarine Box Model Of Freshwater Delivery To The Coastal Ocean For Use In Climate Models, Richard W. Garvine, Michael M. Whitney
An Estuarine Box Model Of Freshwater Delivery To The Coastal Ocean For Use In Climate Models, Richard W. Garvine, Michael M. Whitney
Journal of Marine Research
Present day climate models employ a coarse horizontal grid that is unable to fully resolve estuaries or continental shelves. The importation of fresh water from rivers is critical to the state of deep ocean stratification, but currently the processing of that fresh water as it passes from the river through the estuary and adjacent shelf is not represented in the coastal boundary conditions of climate models. An efficient way to represent this input of fresh water to the deep ocean would be to treat the estuary and shelf domains as two coupled box models with river water input to the …
Critical Effects Of A Tall Seamount On A Drifting Vortex, Georgi G. Sutyrin
Critical Effects Of A Tall Seamount On A Drifting Vortex, Georgi G. Sutyrin
Journal of Marine Research
The initial-value problem for the evolution of an isolated vortex encountering a tall seamount during its westward beta-drift is studied within an equivalent-barotropic model, that is generalized to allow for the intersection of the layer interface with a sloping bottom. Given the Rossby radius and linear wave speed in the model, the parabolic shape of a seamount top and initial potential vorticity profile in the vortex core, the outcome is controlled by the vortex sign and a number of parameters: the seamount radius and height of penetration into the active layer, the radius and intensity of the vortex, the initial …
On The Mechanism Of Centennial Thermohaline Oscillations, Florian Sévellec, Thierry Huck, Mahdi Ben Jelloul
On The Mechanism Of Centennial Thermohaline Oscillations, Florian Sévellec, Thierry Huck, Mahdi Ben Jelloul
Journal of Marine Research
Centennial oscillations of the ocean thermohaline circulation are studied in a 2-D latitude-depth model under mixed boundary conditions (i.e. restoring surface temperature and prescribed freshwater flux). The oscillations are revealed through linear stability analysis of a steady state obtained in a single hemisphere configuration. A density variance budget is performed and helps determine the physical processes sustaining these oscillations: the restoring surface temperature appears as a source of density variance – this is a consequence of positively-correlated temperature and salinity anomalies. A minimal model, the Howard-Malkus loop oscillator, enables us to understand physically the oscillatory and growth mechanisms. The centennial …
Analysis Of Instabilities And Mesoscale Motion In A Terrain-Following Coordinate Ocean Model, Ingerid Fossum, Lars Petter Røed
Analysis Of Instabilities And Mesoscale Motion In A Terrain-Following Coordinate Ocean Model, Ingerid Fossum, Lars Petter Røed
Journal of Marine Research
We perform a combined potential vorticity analysis and energy analysis to analyze instabilities and mesoscale motion in a continuously stratified, terrain-following coordinate ocean model. Care is exercised to ensure that the potential vorticity is conserved along isopycnals in the absence of sources and sinks. We also derive expressions for the energy components and the associated conversion terms suitable for a terrain-following coordinate ocean model. To demonstrate the usefulness of the new combined analysis tool for detection of instabilities, we analyze results from a numerical model experiment in which the ocean model is contained in a long, rectangular channel closed at …
Identifiability And Uncertainty Analysis Of Bio-Irrigation Rates, Johan H. Andersson, Jack J. Middelburg, Karline Soetaert
Identifiability And Uncertainty Analysis Of Bio-Irrigation Rates, Johan H. Andersson, Jack J. Middelburg, Karline Soetaert
Journal of Marine Research
Bio-irrigation is often quantified through incubations where an inert tracer is added to the overlying water of a core or a benthic chamber, and subsequently following the tracer distribution in either the overlying water or the porewater. The interpretation is based on fitting data with a model containing several unknown parameters such as the enhancement over molecular diffusion or non-local exchange. In this paper, we test under what conditions the results obtained through this fitting are robust. We first use identifiability analysis to investigate the minimum data requirements for two types of sediments, representative for deep-sea and shallow-water settings. We …
Carbon Flows Through A Benthic Food Web: Integrating Biomass, Isotope And Tracer Data, Dick Van Oevelen, Karline Soetaert, Jack J. Middelburg, Peter M. J. Herman, Leon Moodley, Ilse Hamels, Tom Moens, Carlo H. R. Heip
Carbon Flows Through A Benthic Food Web: Integrating Biomass, Isotope And Tracer Data, Dick Van Oevelen, Karline Soetaert, Jack J. Middelburg, Peter M. J. Herman, Leon Moodley, Ilse Hamels, Tom Moens, Carlo H. R. Heip
Journal of Marine Research
The herbivorous, detrital and microbial pathways are major components of marine food webs. Although it is commonly recognized that these pathways can be linked in several ways, elucidating carbon transfers between or within these pathways remains a challenge. Intertidal flat communities are driven by a wide spectrum of organic matter sources that support these different pathways within the food web. Here we reconstruct carbon pathways using inverse analysis based on mass balancing, stable isotope signatures and tracer data. Data were available on biomass, total carbon production and processing, integrated diet information from stable isotope signatures and the transfer of recently …
Tidal Fronts And Their Role In Air-Sea Gas Exchange, B. Baschek, D. M. Farmer, C. Garrett
Tidal Fronts And Their Role In Air-Sea Gas Exchange, B. Baschek, D. M. Farmer, C. Garrett
Journal of Marine Research
Tidal fronts are a common feature of many coastal environments. They are characterized by a surface convergence zone that enhances wave breaking and the generation of gas bubbles due to wave-current interaction. The associated downwelling currents carry bubbles to depths of up to 160 m and increase the amount of air that dissolves from them.An energetic tidal front is formed at the entrance to the Strait of Georgia, BC, Canada, by a hydraulically controlled sill flow with vertical velocities of up to 0.75 m s−1. Extensive ship-board measurements during two cruises are interpreted with models of wave-current interaction …
Does The Marine Biosphere Mix The Ocean?, W. K. Dewar, R. J. Bingham, R. L. Iverson, D. P. Nowacek, L. C. St. Laurent, P. H. Wiebe
Does The Marine Biosphere Mix The Ocean?, W. K. Dewar, R. J. Bingham, R. L. Iverson, D. P. Nowacek, L. C. St. Laurent, P. H. Wiebe
Journal of Marine Research
Ocean mixing is thought to control the climatically important oceanic overturning circulation. Here we argue the marine biosphere, by a mechanism like the bioturbation occurring in marine sediments, mixes the oceans as effectively as the winds and tides. This statement is derived ultimately from an estimated 62.7 TeraWatts of chemical power provided to the marine environment in net primary production. Various approaches argue something like 1% (.63 TeraWatts) of this power is invested in aphotic ocean mechanical energy, a rate comparable to wind and tidal inputs.
Variation Beneath The Surface: Quantifying Complex Thermal Environments On Coral Reefs In The Caribbean, Bahamas And Florida, James J. Leichter, Brian Helmuth, Andrew M. Fischer
Variation Beneath The Surface: Quantifying Complex Thermal Environments On Coral Reefs In The Caribbean, Bahamas And Florida, James J. Leichter, Brian Helmuth, Andrew M. Fischer
Journal of Marine Research
Analysis of in situ temperature records collected on six coral reefs in the Caribbean, Bahamas, and Florida Keys reveal significant variability across a range of temporal and spatial scales from minutes to seasons, across depths, and among sites. Subsurface variability occurring at daily and faster frequencies is prevalent across the region, likely driven by combinations of diurnal heating and cooling, wind driven advection, and internal waves at tidal and faster frequencies. This high frequency variability is not detected in records of remotely-sensed sea surface temperature alone. Diurnal variability likely caused by diurnal solar heating and cooling and possibly by advection …
A Model Of Methane Concentration Profiles In The Open Ocean, G. C. Nihous, S. M. Masutani
A Model Of Methane Concentration Profiles In The Open Ocean, G. C. Nihous, S. M. Masutani
Journal of Marine Research
Methane-bearing particulate matter formed in the upper ocean layer is allowed to settle and degrade, releasing methane into the water column as a source in one-dimensional advection-diffusion equations. Predicted carbon and methane particulate fluxes are in good agreement with sediment trap data, using parameters of expected magnitude and particulate methane production well within the mixed layer. This suggests a rapid pathway to the atmosphere and reduced effects on methane concentrations below. Vertical advection rates yielding a good fit between methane concentration calculations and data are larger than expected unless methane oxidation is included. This confirms the significance of methane oxidation …
The Evolution Of Density Currents And Nepheloid Bottom Layers In The Ross Sea (Antarctica), Giorgio Budillon, Ettore Salusti, Sergio Tucci
The Evolution Of Density Currents And Nepheloid Bottom Layers In The Ross Sea (Antarctica), Giorgio Budillon, Ettore Salusti, Sergio Tucci
Journal of Marine Research
In this study we have analyzed the thermohaline, light transmission and particulate matter data, obtained in the western sector of the Ross Sea during the X Italian Expedition, for the purpose of investigating the evolution of the High Salinity Shelf Water in this area. In particular CTD data were used to estimate the baroclinic velocity field. Light transmission and total particulate matter data (from Niskin bottles mounted on a Carousel water sampler) were used to analyze the nepheloid layers and the evolution of the suspended sediments. This basin is characterized by a northward flow of very dense High Salinity Shelf …
Cluster Analysis For Physical Oceanographic Data And Oceanographic Surveys In Turkish Seas, Derya Birant, Alp Kut
Cluster Analysis For Physical Oceanographic Data And Oceanographic Surveys In Turkish Seas, Derya Birant, Alp Kut
Journal of Marine Research
Cluster analysis is a useful data mining method to obtain detailed information on the physical state of the ocean. The primary objective of this study is the development of a new spatio-temporal density-based algorithm for clustering physical oceanographic data. This study extends the regular spatial cluster analysis to deal with spatial data at different epochs. It also presents the sensitivity of the new algorithm to different parameter settings. The purpose of the sensitivity analysis presented in this paper is to identify the response of the algorithm to variations in input parameter values and boundary conditions. In order to demonstrate the …
Inferring Mixed-Layer Depth Variability From Argo Observations In The Western Indian Ocean, T. V. S. Udaya Bhaskar, D. Swain, M. Ravichandran
Inferring Mixed-Layer Depth Variability From Argo Observations In The Western Indian Ocean, T. V. S. Udaya Bhaskar, D. Swain, M. Ravichandran
Journal of Marine Research
The seasonal and spatial variability of mixed layer depth (MLD) was examined in the Western Indian Ocean (WIO) (30E – 80E and 10S – 30N) for three consecutive years starting from June 2002 – May 2005 using Argo temperature and salinity (T/S) profiles. These were compared with MLD estimates from World Ocean Atlas 2001 (WOA01) T/S data. Temporal and spatial variability of MLD estimated from Argo T/S profiles were found to correspond well with the MLD obtained from WOA01 T/S data. However, slight deviations in the form of months of occurrence of minima and maxima MLDs were observed. MLD from …
Bio-Irrigation In Permeable Sediments: An Assessment Of Model Complexity, Filip J. R. Meysman, Oleksiy S. Galaktionov, Britta Gribsholt, Jack J. Middelburg
Bio-Irrigation In Permeable Sediments: An Assessment Of Model Complexity, Filip J. R. Meysman, Oleksiy S. Galaktionov, Britta Gribsholt, Jack J. Middelburg
Journal of Marine Research
Burrowing benthic animals ventilate their burrow networks, and this enhances the transport of solutes in the sediment and exchange with the overlying water column, a process referred to as bio-irrigation. Various models have been proposed to model bio-irrigation, with different levels of sophistication related to model dimensionality and parameter numbers. Here we address the issue of model complexity for bio-irrigation in permeable sediments. To this end, we simulated flowline patterns and tracer signals using (1) a full 3D model that explicitly models the J-shaped geometry of the burrow in a suitable microenvironment surrounding the burrow, (2) a simplified 2D axisymmetric …
Acoustic Observations Of Vertical And Horizontal Swimming Velocities Of A Diel Migrator, C. Smyth, A. E. Hay, P. S. Hill, D. Schillinger
Acoustic Observations Of Vertical And Horizontal Swimming Velocities Of A Diel Migrator, C. Smyth, A. E. Hay, P. S. Hill, D. Schillinger
Journal of Marine Research
A strong sound scattering layer which underwent diel vertical migration was observed over 176 days using a bottom-mounted 600 kHz ADCP at a depth of approximately 285 m on the upper continental slope. Average observed descent times of the scatterers were within 12 minutes of sunrise and average ascent times were within 13 minutes of sunset. Average ascent speeds progressively increased away from the bed and approached 6 cm/s. Average descent speeds similarly reached a maximum of ∼6 cm/s. Horizontal velocities of the scatterers during vertical migration were found to be smaller than ambient velocities (by up to 3 cm/s), …
Variability Of The Subantarctic And Polar Fronts In The Drake Passage As Deduced From Altimetry, Nadine Chouaib, Felix Stoehr, Christine Provost
Variability Of The Subantarctic And Polar Fronts In The Drake Passage As Deduced From Altimetry, Nadine Chouaib, Felix Stoehr, Christine Provost
Journal of Marine Research
The magnitude and time variability of the total volume transport of the Antarctic Circumpolar Current through Drake Passage is a key climatic index, yet still uncertain. We processed ten years of TOPEX/Poseïdon data along two adjacent descending tracks in Drake Passage assuming (following Gille, 1994) that the surface current velocity has a profile structure of double Gaussian jets corresponding respectively to the Subantarctic Front (SAF) and the Polar Front (PF). We seek the location, width and intensity of each jet as a function of time. Results from the two tracks are coherent and show that the time evolution of the …
Differential Fates Of Emiliania Huxleyi-Derived Fatty Acids And Alkenones In Coastal Marine Sediments: Effects Of The Benthic Crustacean Palaemonetes Pugio, Haibing Ding, Ming-Yi Sun
Differential Fates Of Emiliania Huxleyi-Derived Fatty Acids And Alkenones In Coastal Marine Sediments: Effects Of The Benthic Crustacean Palaemonetes Pugio, Haibing Ding, Ming-Yi Sun
Journal of Marine Research
In order to examine how benthic crustaceans affect the fates of phytoplankton-derived lipid biomarkers (fatty acids and alkenones) in coastal marine sediments, we incubated Emiliania huxleyi cells in microcosms (pre-sieved sediment cores with and without the grass shrimp Palaemonetes pugio ) over six weeks. Crustacean, transport of surface sediments, and distributions of algal lipids were followed during incubations. Crustacean activities enhanced degradation of algal fatty acids (2–4× faster) but had a small impact on algal alkenone degradation (<1.4×) compared to the controls. During the first few days of incubations, alkenone concentrations were enriched while algal fatty acid concentrations were depleted in suspended particles in the overlying water of cores, indicating that P. pugio selectively grazed algal material from sediments and preferentially assimilated fatty acids over alkenones through digestion. Unlike algal fatty acids, alkenones …
Sandström’S Experiments Revisited, Melissa A. Coman, Ross W. Griffiths, Graham O. Hughes
Sandström’S Experiments Revisited, Melissa A. Coman, Ross W. Griffiths, Graham O. Hughes
Journal of Marine Research
Sandström's (1908, 1916) pioneering experiments led to the conclusion, later referred to as Sandström's 'theorem', that differential heating and cooling cannot drive a sustained circulation when the source of heating is at or above the level of the cooling source. This principle is incorrect on theoretical grounds and is contradicted by modern laboratory results for the particular case of differential heating and cooling along a single horizontal boundary of a box. However, the 'theorem' has remained common currency. In order to explain the contradiction and explore the fundamentally important concepts involved, we re-create the original experiments of a century ago. …
Synoptic Lagrangian Maps: Application To Surface Transport In Monterey Bay, B. L. Lipphardt Jr., D. Small, A. D. Kirwan Jr., S. Wiggins, K. Ide, C. E. Grosch, J. D. Paduan
Synoptic Lagrangian Maps: Application To Surface Transport In Monterey Bay, B. L. Lipphardt Jr., D. Small, A. D. Kirwan Jr., S. Wiggins, K. Ide, C. E. Grosch, J. D. Paduan
Journal of Marine Research
Here we report on an effort to describe in detail the evolution of surface water particles in Monterey Bay from the time they first enter until the time they leave. The data used for this study are objective mappings from hourly surface currents obtained from high frequency (HF) radar measurements in Monterey Bay for the period 2 June through 4 August 1999. The basic concept is simple: compute the origin and fate of a large number of particles for every hour during the analysis period. However, analyzing and displaying the enormous amount of computed trajectory information required a new data …
Estimation Of Mixed-Layer Depth From Surface Parameters, D. Swain, M. M. Ali, R. A. Weller
Estimation Of Mixed-Layer Depth From Surface Parameters, D. Swain, M. M. Ali, R. A. Weller
Journal of Marine Research
Mixed layer depth (MLD) is an important oceanographic parameter. However, the lack of direct observations of MLD hampers both specification and investigation of its spatial and temporal variability. An important alternative to direct observation would be the ability to estimate MLD from surface parameters easily available from satellites. In this study, we demonstrate estimation of MLD using Artificial Neural Network methods and surface meteorology from a surface mooring in the Arabian Sea. The estimated MLD had a root mean square error of 7.36 m and a coefficient of determination (R2) of 0.94. About 67% (91%) of the …
Corrigendum To Diffusivity And Viscosity Dependence In The Linear Thermocline (J. Mar. Res., 62, 743–769), J. H. Lacasce
Corrigendum To Diffusivity And Viscosity Dependence In The Linear Thermocline (J. Mar. Res., 62, 743–769), J. H. Lacasce
Journal of Marine Research
The statement in LaCasce (2004) that the amplitude, A, of the western boundary layer solution (Eq. 25 in the article) is determined by matching at the northern wall to the streamfunction from the northern boundary inner layer solution, ϕin, is incorrect. The correct procedure is to match to the full boundary layer solution at the northern wall, with contributions from both the inner and outer layers. Doing this ensures that the full transport in the northern layer is fed into the western layer...