globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005134
Scopus记录号: 2-s2.0-84941875936
论文题名:
Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific
作者: Puigcorbé V; , Benitez-Nelson C; R; , Masqué P; , Verdeny E; , White A; E; , Popp B; N; , Prahl F; G; , Lam P; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期:8
起始页码: 1309
结束页码: 1332
语种: 英语
英文关键词: 234Th ; C/234Th ratios ; carbon export ; diazotrophs ; export efficiency ; particle attenuation
Scopus关键词: biogenic deposit ; carbon cycle ; food web ; nutrient dynamics ; particle motion ; particle size ; phytoplankton ; picoplankton ; sediment trap ; silica ; summer ; thorium isotope ; water column ; Gulf of California ; Pacific Ocean ; Pacific Ocean (North) ; Bacillariophyta
英文摘要: Summertime carbon, nitrogen, and biogenic silica export was examined using 234Th:238U disequilibria combined with free floating sediment traps and fine scale water column sampling with in situ pumps (ISP) within the Eastern Tropical North Pacific and the Gulf of California. Fine scale ISP sampling provides evidence that in this system, particulate carbon (PC) and particulate nitrogen (PN) concentrations were more rapidly attenuated relative to 234Th activities in small particles compared to large particles, converging to 1-5 μmol dpm-1 by 100 m. Comparison of elemental particle composition, coupled with particle size distribution analysis, suggests that small particles are major contributors to particle flux. While absolute PC and PN export rates were dependent on the method used to obtain the element/234Th ratio, regional trends were consistent across measurement techniques. The highest C fixation rates were associated with diatom-dominated surface waters. Yet, the highest export efficiencies occurred in picoplankton-dominated surface waters, where relative concentrations of diazotrophs were also elevated. Our results add to the increasing body of literature that picoplankton- and diazotroph-dominated food webs in subtropical regions can be characterized by enhanced export efficiencies relative to food webs dominated by larger phytoplankton, e.g., diatoms, in low productivity pico/nanoplankton-dominated regions, where small particles are major contributors to particle export. Findings from this region are compared globally and provide insights into the efficiency of downward particle transport of carbon and associated nutrients in a warmer ocean where picoplankton and diazotrophs may dominate. Therefore, we argue the necessity of collecting multiple particle sizes used to convert 234Th fluxes into carbon or other elemental fluxes, including <50 μm, since they can play an important role in vertical fluxes, especially in oligotrophic environments. Our results further underscore the necessity of using multiple techniques to quantify particle flux given the uncertainties associated with each collection method. ©2015. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77945
Appears in Collections:气候变化事实与影响

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作者单位: Institut de Ciència i Tecnologia Ambientals, Departament de Física, Universitat Autònoma de Barcelona, Cerdanyola Del Vallès, Barcelona, Spain; Marine Science Program, Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC, United States; Oceans Institute, School of Physics, University of Western Australia, Crawley, WA, Australia; School of Natural Sciences, Centre for Marine Ecosystems Research, Edith Cowan University, Joondalup, WA, Australia; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Geology and Geophysics, University of Hawaii, Honolulu, HI, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Ocean Sciences Department, University of California Santa Cruz, Santa Cruz, CA, United States

Recommended Citation:
Puigcorbé V,, Benitez-Nelson C,R,et al. Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific[J]. Global Biogeochemical Cycles,2015-01-01,29(8)
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