DOI: 10.1002/2016GB005615
Scopus记录号: 2-s2.0-85019987603
论文题名: Variability in the mechanisms controlling Southern Ocean phytoplankton bloom phenology in an ocean model and satellite observations
作者: Rohr T ; , Long M ; C ; , Kavanaugh M ; T ; , Lindsay K ; , Doney S ; C
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 5 起始页码: 922
结束页码: 940
语种: 英语
英文关键词: bloom phenology
; bottom-up controls
; modeling
; phytoplankton
; Southern Ocean
; top-down controls
Scopus关键词: bottom-up control
; community dynamics
; ocean color
; phenology
; phytoplankton
; remote sensing
; satellite altimetry
; sea ice
; top-down control
; Atlantic Ocean
; Atlantic Ocean (Southwest)
; Pacific Ocean
; Pacific Ocean (Southwest)
英文摘要: A coupled global numerical simulation (conducted with the Community Earth System Model) is used in conjunction with satellite remote sensing observations to examine the role of top-down (grazing pressure) and bottom-up (light, nutrients) controls on marine phytoplankton bloom dynamics in the Southern Ocean. Phytoplankton seasonal phenology is evaluated in the context of the recently proposed “disturbance-recovery” hypothesis relative to more traditional, exclusively “bottom-up” frameworks. All blooms occur when phytoplankton division rates exceed loss rates to permit sustained net population growth; however, the nature of this decoupling period varies regionally in Community Earth System Model. Regional case studies illustrate how unique pathways allow blooms to emerge despite very poor division rates or very strong grazing rates. In the Subantarctic, southeast Pacific small spring blooms initiate early cooccurring with deep mixing and low division rates, consistent with the disturbance-recovery hypothesis. Similar systematics are present in the Subantarctic, southwest Atlantic during the spring but are eclipsed by a subsequent, larger summer bloom that is coincident with shallow mixing and the annual maximum in division rates, consistent with a bottom-up, light limited framework. In the model simulation, increased iron stress prevents a similar summer bloom in the southeast Pacific. In the simulated Antarctic zone (70°S–65°S) seasonal sea ice acts as a dominant phytoplankton-zooplankton decoupling agent, triggering a delayed but substantial bloom as ice recedes. Satellite ocean color remote sensing and ocean physical reanalysis products do not precisely match model-predicted phenology, but observed patterns do indicate regional variability in mechanism across the Atlantic and Pacific. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77735
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Climate and Global Dynamics, National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Rohr T,, Long M,C,et al. Variability in the mechanisms controlling Southern Ocean phytoplankton bloom phenology in an ocean model and satellite observations[J]. Global Biogeochemical Cycles,2017-01-01,31(5)