Records |
Author |
Katsaros, K B; Bentamy, A; Bourassa, M; Ebuchi, N; Gower, J; Liu, WT; Vignudelli, S |
Title |
Climate Data Issues from an Oceanographic Remote Sensing Perspective |
Type |
$loc['typeBook Chapter'] |
Year |
2011 |
Publication |
Remote Sensing of the Changing Oceans |
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Pages |
7-32 |
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Springer |
Place of Publication |
Berlin |
Editor |
Tang, D |
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OVWST |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
322 |
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Author |
Chassignet, EP |
Title |
Isopycnic and Hybrid Ocean Modeling in the Context of GODAE |
Type |
$loc['typeBook Chapter'] |
Year |
2011 |
Publication |
Operational Oceanography in the 21st Century |
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Pages |
263-293 |
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Editor |
Schiller, A; Brassington, GB |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
317 |
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Author |
Hurlburt, HE: Metzger, EJ; Richman, JG; Chassignet, EP; Drillet, Y; Hecht, MW; Le Galloudec, O; Shriver, JF; Xu, X; Zamudio, L |
Title |
Dynamical Evaluation of Ocean Models Using the Gulf Stream as an Example |
Type |
$loc['typeBook Chapter'] |
Year |
2011 |
Publication |
Operational Oceanography in the 21st Century |
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Springer |
Place of Publication |
Dordrecht |
Editor |
Schiller A., Brassington G. |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
321 |
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Author |
Bellow, J. G.; Nair, P. K. R.; Martin, T. A. |
Title |
Tree-Crop Interactions in Fruit Tree-based Agroforestry Systems in the Western Highlands of Guatemala: Component Yields and System Performance |
Type |
$loc['typeBook Chapter'] |
Year |
2008 |
Publication |
Toward Agroforestry Design. Advances in Agroforestry |
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Volume |
4 |
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Springer |
Place of Publication |
Dordrecht |
Editor |
Jose, S.; Gordon, A. M. |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
906 |
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Author |
Deng, J.; Wu, Z.; Zhang, M.; Huang, N.E.; Wang, S.; Qiao, F. |
Title |
Using Holo-Hilbert spectral analysis to quantify the modulation of Dansgaard-Oeschger events by obliquity |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Quaternary Science Reviews |
Abbreviated Journal |
Quaternary Science Reviews |
Volume |
192 |
Issue |
|
Pages |
282-299 |
Keywords |
Pleistocene; Paleoclimatology; Greenland; Antarctica; Data treatment; Data analysis; Dansgaard-oeschger (DO) events; Obliquity forcing; Phase preference; Holo-hilbert spectral analysis; Amplitude modulation; EMPIRICAL MODE DECOMPOSITION; GREENLAND ICE-CORE; NONSTATIONARY TIME-SERIES; ABRUPT CLIMATE-CHANGE; LAST GLACIAL PERIOD; NORTH-ATLANTIC; MILLENNIAL-SCALE; RECORDS; VARIABILITY; CYCLE |
Abstract |
Astronomical forcing (obliquity and precession) has been thought to modulate Dansgaard-Oeschger (DO) events, yet the detailed quantification of such modulations has not been examined. In this study, we apply the novel Holo-Hilbert Spectral Analysis (HHSA) to five polar ice core records, quantifying astronomical forcing's time-varying amplitude modulation of DO events and identifying the preferred obliquity phases for large amplitude modulations. The unique advantages of HHSA over the widely used windowed Fourier spectral analysis for quantifying astronomical forcing's nonlinear modulations of DO events is first demonstrated with a synthetic data that closely resembles DO events recorded in Greenland ice cores (NGRIP, GRIP, and GISP2 cores on GICC05 modelext timescale). The analysis of paleoclimatic proxies show that statistically significantly more frequent DO events, with larger amplitude modulation in the Greenland region, tend to occur in the decreasing phase of obliquity, especially from its mean value to its minimum value. In the eastern Antarctic, although statistically significantly more DO events tend to occur in the decreasing obliquity phase in general, the preferred phase of obliquity for large amplitude modulation on DO events is a segment of the increasing phase near the maximum obliquity, implying that the physical mechanisms of DO events may be different for the two polar regions. Additionally, by using cross-spectrum and magnitude-squared analyses, Greenland DO mode at a timescale of about 1400 years leads the Antarctic DO mode at the same timescale by about 1000 years. (C) 2018 Elsevier Ltd. All rights reserved. |
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ISSN |
0277-3791 |
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$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
971 |
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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 |
$loc['typeJournal Article'] |
Year |
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Publication |
Marine Chemistry |
Abbreviated Journal |
Marine Chemistry |
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Issue |
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Pages |
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ISSN |
0304-4203 |
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$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1037 |
Permanent link to this record |
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Author |
Morrow, R.M.; Ohman, M.D.; Goericke, R.; Kelly, T.B.; Stephens, B.M.; Stukel, M.R. |
Title |
CCE V: Primary production, mesozooplankton grazing, and the biological pump in the California Current Ecosystem: Variability and response to El Niño |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Deep Sea Research Part I: Oceanographic Research Papers |
Abbreviated Journal |
Deep Sea Research Part I: Oceanographic Research Papers |
Volume |
140 |
Issue |
|
Pages |
52-62 |
Keywords |
Carbon export; Fecal pellets; Sinking particles; Interannual variability; Net primary productivity; Eastern boundary upwelling system KeyWords Plus:ZOOPLANKTON FECAL PELLETS; NORTH PACIFIC-OCEAN; CURRENT SYSTEM; SOUTHERN CALIFORNIA; UNDERWATER GLIDERS; CARBON EXPORT; ZONE; CHLOROPHYLL; STABILITY; EQUATIONS |
Abstract |
Predicting marine carbon sequestration in a changing climate requires mechanistic understanding of the processes controlling sinking particle flux under different climatic conditions. The recent occurrence of a warm anomaly (2014-2015) followed by an El Nino (2015-2016) in the southern sector of the California Current System presented an opportunity to analyze changes in the biological carbon pump in response to altered climate forcing. We compare primary production, mesozooplankton grazing, and carbon export from the euphotic zone during quasi-Lagrangian experiments conducted in contrasting conditions: two cruises during warm years – one during the warm anomaly in 2014 and one toward the end of El Nino 2016 – and three cruises during El Ninoneutral years. Results showed no substantial differences in the relationships between vertical carbon export and its presumed drivers (primary production, mesozooplankton grazing) between warm and neutral years. Mesozooplankton fecal pellet enumeration and phaeopigment measurements both showed that fecal pellets were the dominant contributor to export in productive upwelling regions. In more oligotrophic regions, fluxes were dominated by amorphous marine snow with negligible pigment content. We found no evidence for a significant shift in the relationship between mesozooplankton grazing rate and chlorophyll concentration. However, massspecific grazing rates were lower at low-to-moderate chlorophyll concentrations during warm years relative to neutral years. We also detected a significant difference in the relationship between phytoplankton primary production and photosynthetically active radiation between years: at similar irradiance and nutrient concentrations, productivity decreased during the warm events. Whether these changes resulted from species composition changes remains to be determined. Overall, our results suggest that the processes driving export remain similar during different climate conditions, but that species compositional changes or other structural changes require further attention. |
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Place of Publication |
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Original Title |
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Series Editor |
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Edition |
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ISSN |
0967-0637 |
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Approved |
$loc['no'] |
Call Number |
COAPS @ rl18 @ |
Serial |
983 |
Permanent link to this record |
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Author |
Morrow, R.M.; Ohman, M.D.; Goericke, R.; Kelly, T.B.; Stephens, B.M.; Stukel, M.R. |
Title |
CCE V: Primary production, mesozooplankton grazing, and the biological pump in the California Current Ecosystem: Variability and response to El Niño |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Deep Sea Research Part I: Oceanographic Research Papers |
Abbreviated Journal |
Deep Sea Research Part I: Oceanographic Research Papers |
Volume |
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Issue |
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Pages |
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Keywords |
Carbon export; Fecal pellets; Sinking particles; Interannual variability; Net primary productivity; Eastern boundary upwelling system |
Abstract |
Predicting marine carbon sequestration in a changing climate requires mechanistic understanding of the processes controlling sinking particle flux under different climatic conditions. The recent occurrence of a warm anomaly (2014�2015) followed by an El Niño (2015�2016) in the southern sector of the California Current System presented an opportunity to analyze changes in the biological carbon pump in response to altered climate forcing. We compare primary production, mesozooplankton grazing, and carbon export from the euphotic zone during quasi-Lagrangian experiments conducted in contrasting conditions: two cruises during warm years – one during the warm anomaly in 2014 and one toward the end of El Niño 2016 � and three cruises during El Niño-neutral years. Results showed no substantial differences in the relationships between vertical carbon export and its presumed drivers (primary production, mesozooplankton grazing) between warm and neutral years. Mesozooplankton fecal pellet enumeration and phaeopigment measurements both showed that fecal pellets were the dominant contributor to export in productive upwelling regions. In more oligotrophic regions, fluxes were dominated by amorphous marine snow with negligible pigment content. We found no evidence for a significant shift in the relationship between mesozooplankton grazing rate and chlorophyll concentration. However, mass-specific grazing rates were lower at low-to-moderate chlorophyll concentrations during warm years relative to neutral years. We also detected a significant difference in the relationship between phytoplankton primary production and photosynthetically active radiation between years: at similar irradiance and nutrient concentrations, productivity decreased during the warm events. Whether these changes resulted from species composition changes remains to be determined. Overall, our results suggest that the processes driving export remain similar during different climate conditions, but that species compositional changes or other structural changes require further attention |
Address |
Deep-Sea Research Part I |
Corporate Author |
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Editor |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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ISSN |
0967-0637 |
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Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
966 |
Permanent link to this record |
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Author |
Morrow, R.M.; Ohman, M.D.; Goericke, R.; Kelly, T.B.; Stephens, B.M.; Stukel, M.R. |
Title |
CCE V: Primary production, mesozooplankton grazing, and the biological pump in the California Current Ecosystem: Variability and response to El Niño |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Deep Sea Research Part I: Oceanographic Research Papers |
Abbreviated Journal |
Deep Sea Research Part I: Oceanographic Research Papers |
Volume |
140 |
Issue |
|
Pages |
52-62 |
Keywords |
Carbon export; Fecal pellets; Sinking particles; Interannual variability; Net primary productivity; Eastern boundary upwelling system |
Abstract |
Predicting marine carbon sequestration in a changing climate requires mechanistic understanding of the processes controlling sinking particle flux under different climatic conditions. The recent occurrence of a warm anomaly (2014-2015) followed by an El Nino (2015-2016) in the southern sector of the California Current System presented an opportunity to analyze changes in the biological carbon pump in response to altered climate forcing. We compare primary production, mesozooplankton grazing, and carbon export from the euphotic zone during quasi-Lagrangian experiments conducted in contrasting conditions: two cruises during warm years – one during the warm anomaly in 2014 and one toward the end of El Nino 2016 – and three cruises during El Ninoneutral years. Results showed no substantial differences in the relationships between vertical carbon export and its presumed drivers (primary production, mesozooplankton grazing) between warm and neutral years. Mesozooplankton fecal pellet enumeration and phaeopigment measurements both showed that fecal pellets were the dominant contributor to export in productive upwelling regions. In more oligotrophic regions, fluxes were dominated by amorphous marine snow with negligible pigment content. We found no evidence for a significant shift in the relationship between mesozooplankton grazing rate and chlorophyll concentration. However, massspecific grazing rates were lower at low-to-moderate chlorophyll concentrations during warm years relative to neutral years. We also detected a significant difference in the relationship between phytoplankton primary production and photosynthetically active radiation between years: at similar irradiance and nutrient concentrations, productivity decreased during the warm events. Whether these changes resulted from species composition changes remains to be determined. Overall, our results suggest that the processes driving export remain similar during different climate conditions, but that species compositional changes or other structural changes require further attention. |
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0967-0637 |
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$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1021 |
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Author |
Kelly, T.B.; Goericke, R.; Kahru, M.; Song, H.; Stukel, M.R. |
Title |
CCE II: Spatial and interannual variability in export efficiency and the biological pump in an eastern boundary current upwelling system with substantial lateral advection |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Deep Sea Research Part I: Oceanographic Research Papers |
Abbreviated Journal |
Deep Sea Research Part I: Oceanographic Research Papers |
Volume |
140 |
Issue |
|
Pages |
14-25 |
Keywords |
CALIFORNIA CURRENT ECOSYSTEM; OCEAN CARBON-CYCLE; COASTAL WATERS; FRONTAL ZONE; TIME-SERIES; FLUX; SINKING; SEA; PACIFIC; ZOOPLANKTON |
Abstract |
Estimating interannual variability in carbon export is a key goal of many marine biogeochemical studies. However, due to variations in export mechanisms between regions, generalized models used to estimate global patterns in export often fail when used for intra-regional analysis. We present here a region-specific model of export production for the California Current Ecosystem (CCE) parameterized using intensive Lagrangian process studies conducted during El Niño-Southern Oscillation (ENSO) warm and neutral phases by the CCE Long-Term Ecological Research (LTER) program. We find that, contrary to expectations from prominent global algorithms, export efficiency (e-ratio = export / primary productivity) is positively correlated with temperature and negatively correlated with net primary productivity (NPP). We attribute these results to the substantial horizontal advection found within the region, and verify this assumption by using a Lagrangian particle tracking model to estimate water mass age. We further suggest that sinking particles in the CCE are comprised of a recently-produced, rapidly-sinking component (likely mesozooplankton fecal pellets) and a longer-lived, slowly-sinking component that is likely advected long distances prior to export. We determine a new algorithm for estimating particle export in the CCE from NPP (Export = 0.08 · NPP + 72 mg C m-2 d-1). We apply this algorithm to a two-decade long time series of NPP in the CCE to estimate spatial and interannual variability across multiple ENSO phases. Reduced export during the warm anomaly of 2014-2015 and El Niño 2015-2016 resulted primarily from decreased export in the coastal upwelling region of the CCE; the oligotrophic offshore region exhibited comparatively low seasonal and interannual variability in flux. The model resolves intra-regional patterns of in situ export measurements, and provides a valuable contrast to global export models. |
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0967-0637 |
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$loc['no'] |
Call Number |
COAPS @ rl18 @ |
Serial |
984 |
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