Records |
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; coastal waters; flux; frontal zone; ocean carbon-cycle; oceanography; pacific; sea; sinking; time-series; Zooplankton |
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 |
0967-0637 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1022 |
Permanent link to this record |
|
|
|
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. |
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 |
0967-0637 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ rl18 @ |
Serial |
983 |
Permanent link to this record |
|
|
|
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 |
|
Issue |
|
Pages |
|
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 |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
English |
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0967-0637 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
966 |
Permanent link to this record |
|
|
|
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. |
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 |
0967-0637 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1021 |
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 |
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. |
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 |
0277-3791 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
|
Approved |
$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
971 |
Permanent link to this record |
|
|
|
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 |
Abbreviated Journal |
|
Volume |
4 |
Issue |
|
Pages |
|
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Springer |
Place of Publication |
Dordrecht |
Editor |
Jose, S.; Gordon, A. M. |
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 |
906 |
Permanent link to this record |
|
|
|
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 |
Abbreviated Journal |
|
Volume |
|
Issue |
|
Pages |
|
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Springer |
Place of Publication |
Dordrecht |
Editor |
Schiller A., Brassington G. |
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 |
321 |
Permanent link to this record |
|
|
|
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 |
Abbreviated Journal |
|
Volume |
|
Issue |
|
Pages |
263-293 |
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
Schiller, A; Brassington, GB |
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 |
317 |
Permanent link to this record |
|
|
|
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 |
Abbreviated Journal |
|
Volume |
|
Issue |
|
Pages |
7-32 |
Keywords |
|
Abstract |
|
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Springer |
Place of Publication |
Berlin |
Editor |
Tang, D |
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Funding |
OVWST |
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
322 |
Permanent link to this record |