Records |
Author |
Wang, S.; Kranz, S.A.; Kelly, T.B.; Song, H.; Stukel, M.R.; Cassar, N. |
Title |
Lagrangian Studies of Net Community Production: The Effect of Diel and Multiday Nonsteady State Factors and Vertical Fluxes on O2/Ar in a Dynamic Upwelling Region |
Type |
$loc['typeJournal Article'] |
Year |
2020 |
Publication |
Journal of Geophysical Research: Biogeosciences |
Abbreviated Journal |
J. Geophys. Res. Biogeosci. |
Volume |
125 |
Issue |
6 |
Pages |
e2019JG005569 |
Keywords |
net community production; O2/Ar; California Current Ecosystem; Lagrangian measurements; vertical fluxes; nonsteady state |
Abstract |
The ratio of dissolved oxygen to argon in seawater is frequently employed to estimate rates of net community production (NCP) in the oceanic mixed layer. The in situ O2/Ar‐based method accounts for many physical factors that influence oxygen concentrations, permitting isolation of the biological oxygen signal produced by the balance of photosynthesis and respiration. However, this technique traditionally relies upon several assumptions when calculating the mixed‐layer O2/Ar budget, most notably the absence of vertical fluxes of O2/Ar and the principle that the air‐sea gas exchange of biological oxygen closely approximates net productivity rates. Employing a Lagrangian study design and leveraging data outputs from a regional physical oceanographic model, we conducted in situ measurements of O2/Ar in the California Current Ecosystem in spring 2016 and summer 2017 to evaluate these assumptions within a �worst‐case� field environment. Quantifying vertical fluxes, incorporating nonsteady state changes in O2/Ar, and comparing NCP estimates evaluated over several day versus longer timescales, we find differences in NCP metrics calculated over different time intervals to be considerable, also observing significant potential effects from vertical fluxes, particularly advection. Additionally, we observe strong diel variability in O2/Ar and NCP rates at multiple stations. Our results reemphasize the importance of accounting for vertical fluxes when interpreting O2/Ar‐derived NCP data and the potentially large effect of nonsteady state conditions on NCP evaluated over shorter timescales. In addition, diel cycles in surface O2/Ar can also bias interpretation of NCP data based on local productivity and the time of day when measurements were made. |
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2169-8953 |
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COAPS @ user @ |
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1114 |
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Author |
Bourassa, M. A. |
Title |
Tehuantepec wind and pressure changes associated with tropical cyclones |
Type |
$loc['typeConference Article'] |
Year |
2001 |
Publication |
11th Conference on Interactions of the Sea and Atmosphere, Amer. Meteor. Soc., San Diego, CA, USA |
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27-28 |
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NASA, SEAWINDS, OVWST |
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$loc['no'] |
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COAPS @ mfield @ |
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815 |
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Author |
Subrahmanyam, B.; Manghanai, V.; O'Brien, J. J.; Morrison, J. M.; Xie, L. |
Title |
A study of the Indian Ocean Dipole Mode Dynamics using satellite observations and MICOM simulations |
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$loc['typeConference Article'] |
Year |
2001 |
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San Diego, California, USA |
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$loc['no'] |
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COAPS @ mfield @ |
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823 |
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Author |
Stukel, M.R.; Biard, T.; Krause, J.W.; Ohman, M.D. |
Title |
Large Phaeodaria in the twilight zone: Their role in the carbon cycle |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Association for the Sciences of Limnology and Oceanography |
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Keywords |
Carbon cycle; Ocean; Twilight zone, Rhizarian measurements; Aulosphaeridae |
Abstract |
Advances in in situ imaging allow enumeration of abundant populations of large Rhizarians that compose a substantial proportion of total mesozooplankton biovolume. Using a quasi-Lagrangian sampling scheme, we quantified the abundance, vertical distributions, and sinking‐related mortality of Aulosphaeridae, an abundant family of Phaeodaria in the California Current Ecosystem. Inter‐cruise variability was high, with average concentrations at the depth of maximum abundance ranging from < 10 to > 300 cells m−3, with seasonal and interannual variability associated with temperature‐preferences and regional shoaling of the 10°C isotherm. Vertical profiles showed that these organisms were consistently most abundant at 100�150 m depth. Average turnover times with respect to sinking were 4.7�10.9 d, equating to minimum in situ population growth rates of ~ 0.1�0.2 d−1. Using simultaneous measurements of sinking organic carbon, we find that these organisms could only meet their carbon demand if their carbon : volume ratio were ~ 1 μg C mm−3. This value is substantially lower than previously used in global estimates of rhizarian biomass, but is reasonable for organisms that use large siliceous tests to inflate their cross‐sectional area without a concomitant increase in biomass. We found that Aulosphaeridae alone can intercept > 20% of sinking particles produced in the euphotic zone before these particles reach a depth of 300 m. Our results suggest that the local (and likely global) carbon biomass of Aulosphaeridae, and probably the large Rhizaria overall, needs to be revised downwards, but that these organisms nevertheless play a major role in carbon flux attenuation in the twilight zone. |
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$loc['yes'] |
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COAPS @ user @ |
Serial |
967 |
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Author |
Bruno-Piverger, R.E. |
Title |
Applying Neural Networks to Simulate Visual Inspection of Observational Weather Data |
Type |
$loc['typeJournal Article'] |
Year |
2019 |
Publication |
Florida State University College of Arts and Sciences, Master's Thesis |
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$loc['no'] |
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COAPS @ user @ |
Serial |
1090 |
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Author |
Xu, X.; Chassignet, E.P., Wang, F. |
Title |
On the variability of the Atlantic meridional overturning circulation transports in coupled CMIP5 simulations |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Climate Dynamics |
Abbreviated Journal |
Clim Dyn. |
Volume |
51 |
Issue |
11 |
Pages |
6511-6531 |
Keywords |
NAO-AMOC; CMIP5; NAO index; AMOC index; meridional pressure gradient; magnitude; structure change of the NAO. |
Abstract |
The Atlantic meridional overturning circulation (AMOC) plays a fundamental role in the climate system, and long-term climate simulations are used to understand the AMOC variability and to assess its impact. This study examines the basic characteristics of the AMOC variability in 44 CMIP5 (Phase 5 of the Coupled Model Inter-comparison Project) simulations, using the 18 atmospherically-forced CORE-II (Phase 2 of the Coordinated Ocean-ice Reference Experiment) simulations as a reference. The analysis shows that on interannual and decadal timescales, the AMOC variability in the CMIP5 exhibits a similar magnitude and meridional coherence as in the CORE-II simulations, indicating that the modeled atmospheric variability responsible for AMOC variability in the CMIP5 is in reasonable agreement with the CORE-II forcing. On multidecadal timescales, however, the AMOC variability is weaker by a factor of more than 2 and meridionally less coherent in the CMIP5 than in the CORE-II simulations. The CMIP5 simulations also exhibit a weaker long-term atmospheric variability in the North Atlantic Oscillation (NAO). However, one cannot fully attribute the weaker AMOC variability to the weaker variability in NAO because, unlike the CORE-II simulations, the CMIP5 simulations do not exhibit a robust NAO-AMOC linkage. While the variability of the wintertime heat flux and mixed layer depth in the western subpolar North Atlantic is strongly linked to the AMOC variability, the NAO variability is not. |
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$loc['no'] |
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COAPS @ rl18 @ |
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981 |
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Author |
Misra, V.; Selman, C.; Waite, A. J.; Bastola, S.; Mishra, A. |
Title |
Terrestrial and Ocean Climate of the 20th Century |
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$loc['typeBook Chapter'] |
Year |
2017 |
Publication |
Florida's climate: Changes, variations, & impacts |
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485-509 |
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Seasonal cycle; Diurnal variations; Sea breeze; ENSO; Tropical cyclones; Hurricanes; AWP; AMO; PDO; PIZA |
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Florida Climate Institute |
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Gainesville, FL |
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Chassignet, E. P.; Jones, J. W.; Misra, V.; Obeysekera, J. |
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$loc['no'] |
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COAPS @ mfield @ |
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849 |
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Author |
Kirtman, B. P.; Misra, V.; Burgman, R. J.; Infanti, J.; Obeysekera, J. |
Title |
Florida Climate Variability and Prediction |
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$loc['typeBook Chapter'] |
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2017 |
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Florida's climate: Changes, variations, & impacts |
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511-532 |
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Multi-model ensembles; Regional climate prediction; Dynamical downscaling; Statistical downscaling |
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Florida Climate Institute |
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Gainesville, FL |
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Chassignet, E. P.; Jones, J. W.; Misra, V.; Obeysekera, J. |
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$loc['no'] |
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COAPS @ mfield @ |
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850 |
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Kirtman, B. P.; Misra, V.; Anandhi, A.; Palko, D.; Infanti, J. |
Title |
Future Climate Change Scenarios for Florida |
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$loc['typeBook Chapter'] |
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2017 |
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Florida's climate: Changes, variations, & impacts |
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533-555 |
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Anthropogenically forced climate change; Decadal climate prediction; Climate projection; Climate scenario; Mitigation; Adaptation |
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Florida Climate Institute |
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Gainesville, FL |
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Chassignet, E. P.; Jones, J. W.; Misra, V.; Obeysekera, J. |
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$loc['no'] |
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COAPS @ mfield @ |
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851 |
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Author |
Robinson, W.; Speich, S.; Chassignet, E. |
Title |
Exploring the Interplay Between Ocean Eddies and the Atmosphere |
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$loc['typeJournal Article'] |
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2018 |
Publication |
Eos |
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Eos |
Volume |
99 |
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Mesoscale; Climate; Variability; Atmospheric |
Abstract |
Climate models, for the first time, have sufficient resolution to capture mesoscale ocean eddies and their interactions with the atmosphere.New model results suggest that the atmosphere, at weather scales or larger, responds to cumulative effects of the much smaller ocean eddies. Intriguing new model results presented at the workshop suggested that the atmosphere, at weather scales or larger. |
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2324-9250 |
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$loc['no'] |
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COAPS @ rl18 @ |
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988 |
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