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Qian, C.; Wu, Z.; Fu, C.; Zhou, T. | ||||
| Title | On multi-timescale variability of temperature in China in modulated annual cycle reference frame | Type | $loc['typeJournal Article'] | ||
| Year | 2010 | Publication | Advances in Atmospheric Sciences | Abbreviated Journal | Adv. Atmos. Sci. |
| Volume | 27 | Issue | 5 | Pages | 1169-1182 |
| Keywords | modulated annual cycle; the Ensemble Empirical Mode Decomposition; climate anomaly; climate normal; variability of surface air temperature in China | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0256-1530 | ISBN | Medium | ||
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| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ mfield @ | Serial | 355 | ||
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| Author |
Qian, C.; Yan, Z.; Wu, Z.; Fu, C.; Tu, K. | ||||
| Title | Trends in temperature extremes in association with weather-intraseasonal fluctuations in eastern China | Type | $loc['typeJournal Article'] | ||
| Year | 2011 | Publication | Advances in Atmospheric Sciences | Abbreviated Journal | Adv. Atmos. Sci. |
| Volume | 28 | Issue | 2 | Pages | 297-309 |
| Keywords | climate extremes; EEMD; weather-intraseasonal fluctuations; modulated annual cycle; global warming | ||||
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| ISSN | 0256-1530 | ISBN | Medium | ||
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| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ mfield @ | Serial | 310 | ||
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| Author |
Stukel, M.R.; Aluwihare, L.I.; Barbeau, K.A.; Chekalyuk, A.M.; Goericke, R.; Miller, A.J.; Ohman, M.D.; Ruacho, A.; Song, H.; Stephens, B.M.; Landry, M.R. | ||||
| Title | Mesoscale ocean fronts enhance carbon export due to gravitational sinking and subduction | Type | $loc['typeJournal Article'] | ||
| Year | 2017 | Publication | Proceedings of the National Academy of Sciences of the United States of America | Abbreviated Journal | Proc Natl Acad Sci U S A |
| Volume | 114 | Issue | 6 | Pages | 1252-1257 |
| Keywords | biological carbon pump; carbon cycle; particle flux; particulate organic carbon; plankton | ||||
| Abstract | Enhanced vertical carbon transport (gravitational sinking and subduction) at mesoscale ocean fronts may explain the demonstrated imbalance of new production and sinking particle export in coastal upwelling ecosystems. Based on flux assessments from 238U:234Th disequilibrium and sediment traps, we found 2 to 3 times higher rates of gravitational particle export near a deep-water front (305 mg Cm-2d-1) compared with adjacent water or to mean (nonfrontal) regional conditions. Elevated particle flux at the front was mechanistically linked to Fe-stressed diatoms and high mesozooplankton fecal pellet production. Using a data assimilative regional ocean model fit to measured conditions, we estimate that an additional approximately 225 mg Cm-2d-1 was exported as subduction of particle-rich water at the front, highlighting a transport mechanism that is not captured by sediment traps and is poorly quantified by most models and in situ measurements. Mesoscale fronts may be responsible for over a quarter of total organic carbon sequestration in the California Current and other coastal upwelling ecosystems. | ||||
| Address | Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093 | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0027-8424 | ISBN | Medium | ||
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| Funding | PMID:28115723; PMCID:PMC5307443 | Approved | $loc['no'] | ||
| Call Number | COAPS @ mfield @ | Serial | 67 | ||
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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 | Abbreviated Journal | |
| Volume | Issue | Pages | |||
| 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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| Funding | Approved | $loc['yes'] | |||
| Call Number | COAPS @ user @ | Serial | 967 | ||
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| 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. | ||||
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| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ rl18 @ | Serial | 978 | ||
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