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Author Qian, C.; Wu, Z.; Fu, C.; Zhou, T. url  doi
openurl 
  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  
  Area Expedition Conference  
  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. url  doi
openurl 
  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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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0256-1530 ISBN Medium  
  Area Expedition Conference  
  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. url  doi
openurl 
  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  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0027-8424 ISBN Medium  
  Area Expedition Conference  
  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. url  doi
openurl 
  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&#8208;related mortality of Aulosphaeridae, an abundant family of Phaeodaria in the California Current Ecosystem. Inter&#8208;cruise variability was high, with average concentrations at the depth of maximum abundance ranging from < 10 to > 300 cells m&#8722;3, with seasonal and interannual variability associated with temperature&#8208;preferences and regional shoaling of the 10°C isotherm. Vertical profiles showed that these organisms were consistently most abundant at 100&#65533;150&#8201;m depth. Average turnover times with respect to sinking were 4.7&#65533;10.9 d, equating to minimum in situ population growth rates of ~ 0.1&#65533;0.2 d&#8722;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 &#956;g C mm&#8722;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&#8208;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&#8201;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. url  doi
openurl 
  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 18151832.  
  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 &#948;15N 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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