DOI: 10.1002/2018JC013787
Scopus记录号: 2-s2.0-85046028756
论文题名: Assessment of Export Efficiency Equations in the Southern Ocean Applied to Satellite-Based Net Primary Production
作者: Arteaga L. ; Haëntjens N. ; Boss E. ; Johnson K.S. ; Sarmiento J.L.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 4 起始页码: 2945
结束页码: 2964
语种: 英语
英文关键词: carbon export
; export efficiency
; Lidar
; productivity
; profiling floats
; Satellites
英文摘要: Carbon export efficiency (e-ratio) is defined as the fraction of organic carbon fixed through net primary production (NPP) that is exported out of the surface productive layer of the ocean. Recent observations for the Southern Ocean suggest a negative e-ratio versus NPP relationship, and a reduced dependency of export efficiency on temperature, different than in the global domain. In this study, we complement information from a passive satellite sensor with novel space-based lidar observations of ocean particulate backscattering to infer NPP over the entire annual cycle, and estimate Southern Ocean export rates from five different empirical models of export efficiency. Inferred Southern Ocean NPP falls within the range of previous studies, with a mean estimate of 15.8 (± 3.9) Pg C yr−1 for the region south of 30° S during the 2005–2016 period. We find that an export efficiency model that accounts for silica(Si)-ballasting, which is constrained by observations with a negative e-ratio versus NPP relationship, shows the best agreement with in situ-based estimates of annual net community production (annual export of 2.7 ± 0.6 Pg C yr−1 south of 30° S). By contrast, models based on the analysis of global observations with a positive e-ratio versus NPP relationship predict annually integrated export rates that are ∼ 33% higher than the Si-dependent model. Our results suggest that accounting for Si-induced ballasting is important for the estimation of carbon export in the Southern Ocean. © 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/114219
Appears in Collections: 气候减缓与适应
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作者单位: Program in Atmospheric and Oceanic Sciences, Princeton University, 300 Forrestal Rd, Princeton, NJ, United States; School of Marine Sciences, University of Maine, Orono, ME, United States; Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States
Recommended Citation:
Arteaga L.,Haëntjens N.,Boss E.,et al. Assessment of Export Efficiency Equations in the Southern Ocean Applied to Satellite-Based Net Primary Production[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(4)