| DOI: | 10.1002/2016GB005554
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| Scopus记录号: | 2-s2.0-85014847508
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| 论文题名: | Upwelling and primary production during the U.S. GEOTRACES East Pacific Zonal Transect |
| 作者: | Kadko D
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| 刊名: | Global Biogeochemical Cycles
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| ISSN: | 8866236
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| 出版年: | 2017
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| 卷: | 31, 期:2 | | 起始页码: | 218
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| 结束页码: | 232
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| 语种: | 英语
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| 英文关键词: | beryllium-7 tracer
; Peruvian coastal upwelling
; primary production
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| Scopus关键词: | advection
; beryllium isotope
; coastal circulation
; diffusivity
; euphotic zone
; gyre
; mixed layer
; net primary production
; nitrate
; one-dimensional modeling
; primary production
; thermocline
; tracer
; transect
; upwelling
; water column
; Pacific Ocean
; Pacific Ocean (East)
; Peru
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| 英文摘要: | The 2013 U.S. GEOTRACES Eastern Pacific Zonal Transect (EPZT) traversed the highly productive Peruvian coastal upwelling (PCU) region. In this work, the flux of nitrate into the euphotic zone is derived for stations within the PCU using a previously developed method whereby dilution of the water column 7Be inventory by upwelled 7Be-free water provides a means to infer upwelling rates. Furthermore, with knowledge of upwelling rates, 7Be profiles are used to constrain vertical diffusivity within the upper thermocline. These transport terms are applied to nitrate profiles to estimate net community production between 79°W and 104°W along the EPZT, which includes the zone of active upwelling to the edge of the oligotrophic gyre. With a simple, one-dimensional model, the calculated upwelling rates were inversely related to mixed layer temperature and ranged from 0 to 3.0 m/d. Results using a depth-dependent upwelling rate with a component of horizontal advection are also described. Vertical diffusivities near the base of the euphotic zone were in the range 1.7–4.5 × 10−4 m2/s. These values are compared to those generated by analysis of temperature profiles. Net community production averaged 15 mmol C/m2/d for stations between 84°W and 104°W and was 134 mmol C/m2/d for the furthest inshore station at 79°W which displayed the lowest SST and greatest rate of upwelling. ©2017. American Geophysical Union. All Rights Reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/77766
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Applied Research Center, Florida International University, Miami, FL, United States
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| Recommended Citation: | |
Kadko D. Upwelling and primary production during the U.S. GEOTRACES East Pacific Zonal Transect[J]. Global Biogeochemical Cycles,2017-01-01,31(2)
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