Records |
Author |
Stukel, M.R.; Décima, M.; Landry, M.R.; Selph, K.E. |
Title |
Nitrogen and isotope flows through the Costa Rica Dome upwelling ecosystem: The crucial mesozooplankton role in export flux |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Global Biogeochemical Cycles |
Abbreviated Journal |
Global Biogeochemical Cycles |
Volume |
32 |
Issue |
12 |
Pages |
1815–1832. |
Keywords |
Crustaceans; Diel vertical migration; Nitrogen cycle; Biological carbon pump; Nitrogen isotopes; Linear inverse ecosystem model |
Abstract |
The Costa Rica Dome (CRD) is an open-ocean upwelling ecosystem, with high biomasses of picophytoplankton (especially Synechococcus), mesozooplankton, and higher trophic levels. To elucidate the food web pathways supporting the trophic structure and carbon export in this unique ecosystem, we used Markov Chain Monte Carlo techniques to assimilate data from four independent realizations of δ15N and planktonic rate measurements from the CRD into steady state, multicompartment ecosystem box models (linear inverse models). Model results present well-constrained snapshots of ecosystem nitrogen and stable isotope fluxes. New production is supported by upwelled nitrate, not nitrogen fixation. Protistivory (rather than herbivory) was the most important feeding mode for mesozooplankton, which rely heavily on microzooplankton prey. Mesozooplankton play a central role in vertical nitrogen export, primarily through active transport of nitrogen consumed in the surface layer and excreted at depth, which comprised an average 36-46% of total export. Detritus or aggregate feeding is also an important mode of resource acquisition by mesozooplankton and regeneration of nutrients within the euphotic zone. As a consequence, the ratio of passively sinking particle export to phytoplankton production is very low in the CRD. Comparisons to similar models constrained with data from the nearby equatorial Pacific demonstrate that the dominant role of vertical migrators to the biological pump is a unique feature of the CRD. However, both regions show efficient nitrogen transfer from mesozooplankton to higher trophic levels (as expected for regions with large fish, cetacean, and seabird populations) despite the dominance of protists as major grazers of phytoplankton. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ rl18 @ |
Serial |
978 |
Permanent link to this record |
|
|
|
Author |
Stukel, M.R.; Ducklow, H.W. |
Title |
Stirring Up the Biological Pump: Vertical Mixing and Carbon Export in the Southern Ocean |
Type |
$loc['typeJournal Article'] |
Year |
2017 |
Publication |
Global Biogeochemical Cycles |
Abbreviated Journal |
Global Biogeochem. Cycles |
Volume |
31 |
Issue |
9 |
Pages |
1420-1434 |
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0886-6236 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
361 |
Permanent link to this record |
|
|
|
Author |
Stukel, M.R.; Kahru, M.; Benitez-Nelson, C.R.; Décima, M.; Goericke, R.; Landry, M.R.; Ohman, M.D. |
Title |
Using Lagrangian-based process studies to test satellite algorithms of vertical carbon flux in the eastern North Pacific Ocean |
Type |
$loc['typeJournal Article'] |
Year |
2015 |
Publication |
Journal of Geophysical Research: Oceans |
Abbreviated Journal |
J. Geophys. Res. Oceans |
Volume |
120 |
Issue |
11 |
Pages |
7208-7222 |
Keywords |
satellite-derived export; carbon export; model algorithms; mesozooplankton grazing; sinking particles; gravitational flux |
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
2169-9275 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
113 |
Permanent link to this record |
|
|
|
Author |
Stukel, M.R.; Kelly, T.B. |
Title |
The carbon: (234) Thorium ratios of sinking particles in the California current ecosystem 2: Examination of a thorium sorption, desorption, and particle transport model |
Type |
$loc['typeJournal Article'] |
Year |
2019 |
Publication |
Marine Chemistry |
Abbreviated Journal |
Marine Chemistry |
Volume |
212 |
Issue |
|
Pages |
1-15 |
Keywords |
POC concentration; sinking particles.; depth and relationship with water; phytoplankton |
Abstract |
Thorium-234 (234Th) is a powerful tracer of particle dynamics and the biological pump in the surface ocean; however, variability in carbon: thorium ratios of sinking particles adds substantial uncertainty to estimates of organic carbon export. We coupled a mechanistic thorium sorption and desorption model to a one-dimensional particle sinking model that uses realistic particle settling velocity spectra. The model generates estimates of 238U234Th disequilibrium, particulate organic carbon concentration, and the C:234Th ratio of sinking particles, which are then compared to in situ measurements from quasi-Lagrangian studies conducted on six cruises in the California Current Ecosystem. Broad patterns observed in in situ measurements, including decreasing C:234Th ratios with depth and a strong correlation between sinking C:234Th and the ratio of vertically-integrated particulate organic carbon (POC) to vertically-integrated total water column 234Th, were accurately recovered by models assuming either a power law distribution of sinking speeds or a double log normal distribution of sinking speeds. Simulations suggested that the observed decrease in C:234Th with depth may be driven by preferential remineralization of carbon by particle-attached microbes. However, an alternate model structure featuring complete consumption and/or disaggregation of particles by mesozooplankton (e.g. no preferential remineralization of carbon) was also able to simulate decreasing C:234Th with depth (although the decrease was weaker), driven by 234Th adsorption onto slowly sinking particles. Model results also suggest that during bloom decays C:234Th ratios of sinking particles should be higher than expected (based on contemporaneous water column POC), because high settling velocities minimize carbon remineralization during sinking. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0304-4203 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1002 |
Permanent link to this record |
|
|
|
Author |
Stukel, M.R.; Kelly, T.B. |
Title |
The carbon: 234Thorium ratios of sinking particles in the California current ecosystem 2: Examination of a thorium sorption, desorption, and particle transport model |
Type |
$loc['typeJournal Article'] |
Year |
|
Publication |
Marine Chemistry |
Abbreviated Journal |
Marine Chemistry |
Volume |
|
Issue |
|
Pages |
|
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0304-4203 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1037 |
Permanent link to this record |
|
|
|
Author |
Stukel, M.R.; Ohman, M.D.; Kelly, T.B.; Biard, T. |
Title |
The Roles of Suspension-Feeding and Flux-Feeding Zooplankton as Gatekeepers of Particle Flux Into the Mesopelagic Ocean in the Northeast Pacific |
Type |
$loc['typeJournal Article'] |
Year |
2019 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
Front. Mar. Sci. |
Volume |
6 |
Issue |
|
Pages |
|
Keywords |
biological pump; carbon export; remineralization length scale; mesozooplankton ecology; pteropods; marine biogeochemistry; sinking particles; marine snow |
Abstract |
Zooplankton are important consumers of sinking particles in the ocean's twilight zone. However, the impact of different taxa depends on their feeding mode. In contrast to typical suspension-feeding zooplankton, flux-feeding taxa preferentially consume rapidly sinking particles that would otherwise penetrate into the deep ocean. To quantify the potential impact of two flux-feeding zooplankton taxa [Aulosphaeridae (Rhizaria), and Limacina helicina (euthecosome pteropod)] and the total suspension-feeding zooplankton community, we measured depth-stratified abundances of these organisms during six cruises in the California Current Ecosystem. Using allometric-scaling relationships, we computed the percentage of carbon flux intercepted by flux feeders and suspension feeders. These estimates were compared to direct measurements of carbon flux attenuation (CFA) made using drifting sediment traps and U-238-Th-234 disequilibrium. We found that CFA in the shallow twilight zone typically ranged from 500 to 1000 m mol organic C flux remineralized per 10-m vertical depth bin. This equated to approximately 6-10% of carbon flux remineralized/10 m. The two flux-feeding taxa considered in this study could account for a substantial proportion of this flux near the base of the euphotic zone. The mean flux attenuation attributable to Aulosphaeridae was 0.69%/10 m (median = 0.21%/10 m, interquartile range = 0.04-0.81%) at their depth of maximum abundance (similar to 100 m), which would equate to similar to 10% of total flux attenuation in this depth range. The maximum flux attenuation attributable to Aulosphaeridae reached 4.2%/10 m when these protists were most abundant. L. helicina, meanwhile, could intercept 0.45-1.6% of carbon flux/10 m, which was slightly greater (on average) than the Aulosphaeridae. In contrast, suspension-feeding zooplankton in the mesopelagic (including copepods, euphausiids, appendicularians, and ostracods) had combined clearance rates of 2-81 L m(-3) day(-1) (mean of 19.6 L m(-3) day(-1)). This implies a substantial impact on slowly sinking particles, but a negligible impact on the presumably rapidly sinking fecal pellets that comprised the majority of the material collected in sediment traps. Our results highlight the need for a greater research focus on the many taxa that potentially act as flux feeders in the oceanic twilight zone. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
2296-7745 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1066 |
Permanent link to this record |
|
|
|
Author |
Sturges, W.; Bozec, A. |
Title |
A Puzzling Disagreement between Observations and Numerical Models in the Central Gulf of Mexico |
Type |
$loc['typeJournal Article'] |
Year |
2013 |
Publication |
Journal of Physical Oceanography |
Abbreviated Journal |
J. Phys. Oceanogr. |
Volume |
43 |
Issue |
12 |
Pages |
2673-2681 |
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0022-3670 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
Deep-C |
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
227 |
Permanent link to this record |
|
|
|
Author |
Subrahmanyam, B, J.J. O'Brien, V. Manghanani, L. Xie, and J.M. Morrison |
Title |
Estimation of Heat Transports in the Indian Ocean uisng Altimetry and MICOMi |
Type |
$loc['typeConference Article'] |
Year |
2003 |
Publication |
WMO WORLD Climate Research Programme, CAS/JSC Working Group on Numerical Experimentation, Research Activities in Atmospheric and Oceanic Modelling |
Abbreviated Journal |
|
Volume |
|
Issue |
|
Pages |
|
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
866 |
Permanent link to this record |
|
|
|
Author |
Subrahmanyam, B.; Babu, V.R.; Murty, V.S.N.; Rao, L.V.G. |
Title |
Surface circulation off Somalia and western equatorial Indian Ocean during summer monsoon of 1988 from Geosat altimeter data |
Type |
$loc['typeJournal Article'] |
Year |
1996 |
Publication |
International Journal of Remote Sensing |
Abbreviated Journal |
International Journal of Remote Sensing |
Volume |
17 |
Issue |
4 |
Pages |
761-770 |
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0143-1161 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
713 |
Permanent link to this record |
|
|
|
Author |
Subrahmanyam, B.; Legler, D. M.; Barnier, B.; de Miranda, A. P.; O'Brien, J. J. |
Title |
Sensitivity of the North Atlantic circulation to momentum forcing using SPEM |
Type |
$loc['typeConference Article'] |
Year |
2000 |
Publication |
IGARSS 2000, Honolulu, Hawaii, USA |
Abbreviated Journal |
|
Volume |
|
Issue |
|
Pages |
|
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
797 |
Permanent link to this record |