DOI: 10.1029/2018GB006003
论文题名: Theoretical Considerations on Factors Confounding the Interpretation of the Oceanic Carbon Export Ratio
作者: Li Z. ; Cassar N.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 11 语种: 英语
英文关键词: carbon cycle
; community structure
; ecosystem dynamics
; environmental factor
; euphotic zone
; global ocean
; irradiation
; light attenuation
; metabolism
; mixed layer
; phytoplankton
; primary production
; seasonality
; theoretical study
学科: export production
; net community production
; net primary production
; oceanic carbon export ratio
中文摘要: The fraction of primary production exported out of the surface ocean, known as the export ratio (ef ratio), is often used to assess how various factors, including temperature, primary production, phytoplankton size, and community structure, affect the export efficiency of an ecosystem. To investigate possible causes for reported discrepancies in the dominant factors influencing the export efficiency, we develop a metabolism-based mechanistic model of the ef ratio. Consistent with earlier studies, we find based on theoretical considerations that the ef ratio is a negative function of temperature. We show that the ef ratio depends on the optical depth, defined as the physical depth times the light attenuation coefficient. As a result, varying light attenuation may confound the interpretation of ef ratio when measured at a fixed depth (e.g., 100 m) or at the base of the mixed layer. Finally, we decompose the contribution of individual factors on the seasonality of the ef ratio. Our results show that at high latitudes, the ef ratio at the base of mixed layer is strongly influenced by mixed layer depth and surface irradiation on seasonal time scales. Future studies should report the ef ratio at the base of the euphotic layer or account for the effect of varying light attenuation if measured at a different depth. Overall, our modeling study highlights the large number of factors confounding the interpretation of field observations of the ef ratio. ©2018. 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/160181
Appears in Collections: 气候变化与战略
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作者单位: Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, NC, United States; Now at Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
Li Z.,Cassar N.. Theoretical Considerations on Factors Confounding the Interpretation of the Oceanic Carbon Export Ratio[J]. Global Biogeochemical Cycles,2018-01-01,32(11)