热带海洋学报 ›› 2016, Vol. 35 ›› Issue (3): 55-64.doi: 10.11978/2015035

• 海洋化学 • 上一篇    下一篇

南海西部秋季海表pCO2分布与海-气CO2通量*

许欣, 于培松, 蔡小霞, 潘建明, 胡佶, 张海峰   

  1. 国家海洋局海洋生态系统与生物地球化学重点实验室, 国家海洋局第二海洋研究所, 浙江 杭州 310012
  • 收稿日期:2015-03-09 出版日期:2016-05-29 发布日期:2016-05-27
  • 通讯作者: 潘建明。E-mail: jmpan@sio.org.cn
  • 作者简介:许欣(1989—),男,浙江省临安市人,硕士研究生,从事海洋环境化学方面研究。E-mail: xuxin0713@hotmail.com
  • 基金资助:
    全球变化与海气相互作用专项(GASI-03-01-02-02、GASI-03-01-03-02、GASI-03-01-06-05); 国家自然科学基金项目(91128212)

Distributions of partial pressure of carbon dioxide and sea-air CO2 flux in the western South China Sea in autumn*

XU Xin, YU Peisong, CAI Xiaoxia, PAN Jianming, HU Ji, ZHANG Haifeng   

  1. Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration; Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
  • Received:2015-03-09 Online:2016-05-29 Published:2016-05-27
  • Contact: PAN Jianming. E-mail: jmpan@sio.org.cn
  • Supported by:
    Global Change and Ocean-Atmosphere Interaction (GASI-03-01-02-02, GASI-03-01-03-02, GASI-03-01-06-05); National Natural Science Foundation of China (91128212)

摘要: 文章综合分析了南海西部2012年秋季海表二氧化碳分压(pCO2)分布及控制因素, 估算并讨论了海-气CO2通量及其区域性差异。结果表明, 秋季南海西部海表pCO2变化范围为37.8~57.1Pa, 均高于大气pCO2, 表现为大气CO2的源。研究海域海表pCO2分布主要受海水碳酸盐热力学的影响, 海表温度(SST)是影响海表pCO2分布的主要因素。但在局部海域, 海表pCO2分布还受到其他因素的控制。其中, 越南东部局部海域表层海水受湄公河冲淡水的影响呈低盐特征, 高pCO2的冲淡水团和离岸水团的混合作用直接影响该海域海表pCO2分布。此外, 珊瑚礁的钙化活动造成南沙群岛弹丸礁西部海域出现表层pCO2极高值。秋季南海西部表层海水CO2释放速率的分布格局主要受风速的控制。北部海域海-气CO2分压差(ΔpCO2)低于中南部海盆, 但其海表风速远高于中南部海盆, 造成北部海域表层海水CO2释放速率(2.9mmolC·m-2·d-1)明显高于中南部海盆(0.9mmolC·m-2·d-1)。海-气CO2通量估算中不能忽视局部海域珊瑚礁代谢作用的影响。

关键词: 南海西部, 二氧化碳分压, 海-气CO2通量

Abstract: Distribution of pCO2 in the surface water of the western South China Sea (SCS) was examined using data for autumn 2012. In this study, the control factors of surface pCO2 were investigated and sea-air CO2 flux in the study area was estimated. The results showed that sea surface pCO2 values of 37.8 to 57.1 Pa were observed in the western SCS. The sea surface pCO2 was always higher than that in the atmosphere, which indicated the western SCS acted as a source of the atmosphere CO2 in autumn. In the study area, sea surface pCO2 was mainly controlled by carbonate thermodynamics, and sea surface temperature (SST) was the predominant factor that controlled pCO2 distribution. However, sea surface pCO2 was also influenced by other factors in some areas. The transport of Mekong River diluted water led to low surface salinity water located in the Vietnamese eastern offshore region. Water mixing between Mekong River diluted water with high pCO2 and offshore water affected the regional surface pCO2 distribution directly. Furthermore, calcification process of coral reef organisms caused extremely high sea surface pCO2 to exist in the western Swallow Reef of the Nansha Islands. The CO2 outgassing rate of the western SCS in autumn was mainly influenced by sea surface wind speed, with average CO2 outgassing rate of 2.9 mmolC·m-2·d-1 in the northern continental shelf and northern basin and of 0.9 mmolC·m-2·d-1 in the central and southern basins. The effect of metabolism of coral reefs in regional areas should not be neglected in CO2 flux estimation.

Key words: the Western South China Sea, partial pressure of carbon dioxide, sea-air CO2 flux

中图分类号: 

  • P734.45