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Air–sea Co2 Fluxes in the East China Sea Based on Multiple-year Underway Observations : Volume 12, Issue 7 (01/04/2015)

By Guo, X.-h.

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Book Id: WPLBN0003980075
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: Air–sea Co2 Fluxes in the East China Sea Based on Multiple-year Underway Observations : Volume 12, Issue 7 (01/04/2015)  
Author: Guo, X.-h.
Volume: Vol. 12, Issue 7
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Zhai, W., Xu, Y., Zhang, C., Guo, X., Li, Q., Bai, Y.,...Wang, G. (2015). Air–sea Co2 Fluxes in the East China Sea Based on Multiple-year Underway Observations : Volume 12, Issue 7 (01/04/2015). Retrieved from

Description: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China. This study reports thus far a most comprehensive dataset of surface seawater pCO2 (partial pressure of CO2) and the associated air–sea CO2 fluxes in a major ocean margin, the East China Sea (ECS) based on 24 surveys conducted in 2006 to 2011. We showed highly dynamic spatial variability of sea surface pCO2 in the ECS except in winter when it ranged in a narrow band of 330 to 360 μatm. In this context, we categorized the ECS into five different domains featured with different physics and biogeochemistry to better characterize the seasonality of the pCO2 dynamics and to better constrain the CO2 flux. The five domains are (I) the outer Changjiang estuary and Changjiang plume, (II) the Zhejiang–Fujian coast, (III) the northern ECS shelf, (IV) the middle ECS shelf, and (V) the southern ECS shelf. In spring and summer, pCO2 off the Changjiang estuary was as low as < 100 μatm, while it was up to > 400 μatm in fall. pCO2 along the Zhejiang–Fujian coast was low in spring, summer and winter (300 to 350 μatm) but was relatively high in fall (> 350 μatm). In the northern ECS shelf, pCO2 in summer and fall was > 340 μatm in most areas, higher than in winter and spring. In the middle and southern ECS shelf, pCO2 in summer ranged from 380 to 400 μatm, which was higher than in other seasons (< 350 μatm). The area-weighted CO2 flux in the entire ECS shelf was −10.0 ± 2.0 mmol m−2 d−1 in winter, −11.7 ± 3.6 mmol m−2 d−1 in spring, −3.5 ± 4.6 mmol m−2 d−1 in summer and −2.3 ± 3.1 mmol m−2 d−1 in fall. It is important to note that the standard deviations in these flux ranges mostly reflect the spatial variation of pCO2, which differ from the spatial variance nor the bulk uncertainty. Nevertheless, on an annual basis, the average CO2 influx into the entire ECS shelf was −6.9 ± 4.0 mmol m−2 d−1, about twice the global average in ocean margins.

Air–sea CO2 fluxes in the East China Sea based on multiple-year underway observations

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