globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015MS000436
Scopus记录号: 2-s2.0-84945474974
论文题名:
Modeling photosynthesis in sea ice-covered waters
作者: Long M; C; , Lindsay K; , Holland M; M
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期:3
起始页码: 1189
结束页码: 1206
语种: 英语
英文关键词: Aquatic ecosystems ; Biogeochemistry ; Climate change ; Ecology ; Ecosystems ; Photosynthesis ; Phytoplankton ; Quantum theory ; Sea ice ; Biogeochemical reactions ; Carbon cycles ; Net primary productivity ; Ocean biogeochemistry ; Polar marine ecosystem ; Primary productivity ; Small-scale heterogeneity ; Subgrid scale variabilities ; Ice ; annual variation ; biogeochemistry ; carbon cycle ; ecosystem modeling ; marine ecosystem ; net primary production ; photosynthesis ; sea ice ; shortwave radiation ; trophic level ; Arctic and Antarctic
英文摘要: The lower trophic levels of marine ecosystems play a critical role in the Earth System mediating fluxes of carbon to the ocean interior. Many of the functional relationships describing biological rate processes, such as primary productivity, in marine ecosystem models are nonlinear functions of environmental state variables. As a result of nonlinearity, rate processes computed from mean fields at coarse resolution will differ from similar computations that incorporate small-scale heterogeneity. Here we examine how subgrid-scale variability in sea ice thickness impacts simulated net primary productivity (NPP) in a 1°×1° configuration of the Community Earth System Model (CESM). CESM simulates a subgrid-scale ice thickness distribution and computes shortwave penetration independently for each ice thickness category. However, the default model formulation uses grid-cell mean irradiance to compute NPP. We demonstrate that accounting for subgrid-scale shortwave heterogeneity by computing light limitation terms under each ice category then averaging the result is a more accurate invocation of the photosynthesis equations. Moreover, this change delays seasonal bloom onset and increases interannual variability in NPP in the sea ice zone in the model. The new treatment reduces annual production by about 32% in the Arctic and 19% in the Antarctic. Our results highlight the importance of considering heterogeneity in physical fields when integrating nonlinear biogeochemical reactions. © 2015. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75977
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: National Center for Atmospheric Research, Boulder, CO, United States

Recommended Citation:
Long M,C,, Lindsay K,et al. Modeling photosynthesis in sea ice-covered waters[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(3)
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