东海2012年夏季海-气界面碳交换及其区域碳汇强度变化趋势初探

陈鑫; 宋金明; 袁华茂; 李学刚; 李宁; 段丽琴; 曲宝晓

doi:10.3969/j.issn.0253-4193.2014.12.002

东海2012年夏季海-气界面碳交换及其区域碳汇强度变化趋势初探

doi: 10.3969/j.issn.0253-4193.2014.12.002

1.
中国科学院海洋研究所海洋生态与环境科学重点实验室, 山东青岛 266071;中国科学院大学, 北京 100049
2.
中国科学院海洋研究所海洋生态与环境科学重点实验室, 山东青岛 266071

基金项目: 中国科学院先导专项课题(XDA11020102,XDA05030402);国家重点基础研究发展计划项目课题(2010CB951802,2011CB403602)。

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- 收稿日期: 2014-01-07
- 修回日期: 2014-05-02

CO₂ fluxes across the air-sea interface of the East China Sea in summer 2012 and the change tendency of regional carbon sink strength

1.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, China

摘要

摘要: 基于2012年7月对东海的调查,剖析了其水体中各形态碳(pCO₂、DIC、DOC、POC)的区域分布特征,估算了海-气界面CO₂的交换通量(FCO₂),探讨了影响其交换的主要因素,在此基础上,结合历史资料初步分析了近十几年来该海域海-气界面CO₂交换通量的变化趋势。结果表明,2012年7月长江口邻近海域相对南部陆架区具有较低的DIC浓度,而DOC与POC的浓度相对较高。调查区域表层水pCO₂变化范围为96.28~577.7 μatm(1 atm为101 325 Pa),平均值为297.6 μatm,低值区出现在长江冲淡水区(30°~33°N,123°~125°E),高值区主要分布在东海陆架的南部区域。表层水pCO₂主要受控于长江冲淡水的输入和混合(盐度)、台湾暖流以及生物生产等。调查海域2012年7月海-气FCO₂平均为(-6.410±7.486) mmol/(m²·d),表现东海在夏季是大气CO₂的汇区,区域碳汇强度由强到弱依次为:长江冲淡水区(CDW)、黄东海混合水区(YEMW)、陆架咸淡水混合区(SMW)、近岸上升流区(CUW)和台湾暖流区(TWCW),东海夏季每日吸收大气CO₂(以C计)约(18.3±19.8)kt。结合历史资料分析发现,近十几年来东海夏季碳汇强度有增强趋势,CDW区的海-气界面CO₂通量平均年增速为-0.814 mmol/(m²·d),即海水吸收大气二氧化碳每年增加约54.6 kt,是夏季东海碳汇增加的最主要贡献者。
- 海气界面碳通量 /
- 控制因素 /
- 碳汇 /
- 变化趋势 /
- 东海
Abstract: The surface water partial pressure of CO₂(pCO₂),dissolved inorganic carbon(DIC),dissolved organic carbon(DOC) and particulate organic carbon(POC) in the East China Sea(ECS) were investigated during the survey in July 2012. The results showed that the adjacent area of the Changjiang estuary had higher DOC and POC contents and lower DIC than the southern shelf. Surface pCO₂ in the ECS ranged from 96.28 to 577.7 μatm (mean is 297.6 μatm,1 atm is 101 325 Pa). Low pCO₂ levels were found in area (30°-33°N,123°-125°E) of the Changjiang Diluted Water (CDW),whereas high pCO₂ levels occurred in the southern ECS shelf affected by the Taiwan Current Warm. The surface pCO₂ was mainly influenced by the Changjiang freshwater input and mixing,Taiwan warm current water and biological production. The average summer FCO₂ in the ECS was(-6.410±7.486) mmol/(m²·d),indicating that the ECS served as a CO₂ sink which absorbed (1.83±1.98)×10⁴ t carbon every day in the summer. The regional carbon fluxes sorted from high to low as CDW,YEMW,SMW,CUW(Coastal Upwelling Water) and TWCW. Comparing with the historical data,the effect of the ECS as a CO₂ sink was gradually enhancing in the last ten years. The CDW was the biggest contributor to the increased carbon sink in the ECS. And the FCO₂ annual growth rate in the CDW area was -0.814 mmol/(m²·d),meaning that every summer the CDW could take up 5.46×10⁴ t more than last year's.
- air-sea CO₂ flux /
- controlling factor /
- carbon sink /
- change tendency /
- East China Sea

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东海2012年夏季海-气界面碳交换及其区域碳汇强度变化趋势初探

doi: 10.3969/j.issn.0253-4193.2014.12.002

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CO₂ fluxes across the air-sea interface of the East China Sea in summer 2012 and the change tendency of regional carbon sink strength

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东海2012年夏季海-气界面碳交换及其区域碳汇强度变化趋势初探

doi: 10.3969/j.issn.0253-4193.2014.12.002

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CO2 fluxes across the air-sea interface of the East China Sea in summer 2012 and the change tendency of regional carbon sink strength

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CO₂ fluxes across the air-sea interface of the East China Sea in summer 2012 and the change tendency of regional carbon sink strength