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Enhanced sea-air CO2 exchange influenced by a tropical depression in the South China Sea

  • [设施]:实验1
  • [期刊/会议名称]:JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
  • [摘要]:Ship measurements made 2 days after the passage of a tropical depression (TD) in the South China Sea (SCS, April 2011) showed two contrasted responses of the partial pressure of CO2 at sea surface (pCO(2,sw)). In low sea-surface salinity (SSS) water, pCO(2,sw) was low (3497 atm), and the area was a carbon sink (-4.71.8 mmol CO2 m(-2) d(-1)), whereas in water with high SSS and chlorophyll a and low dissolved oxygen and sea surface temperature, pCO(2,sw) was higher than for normal SCS water (3768 versus 3624 atm) and the area was a carbon source (1.2 +/- 3.1 mmol CO2 m(-2) d(-1)). Satellite data showed two large areas of low SSS before the TD, which were likely influenced by rainfall, and these areas were considered to have low pCO(2,sw) because of their low SSS. The high pCO(2,sw) after the TD is explained by the uplifting to the surface of deeper and CO2-rich water, due to winds accompanied by the TD. The difference in sea-air CO2 flux between the TD-affected area and the lower-SSS water was 1.99+4.70= 6.7 mmol CO2 m(-2) d(-1), indicating a 100% change caused by the TD compared to the average seasonal value in spring in southern SCS (3.3 +/- 0.3 mmol CO2 m(-2) d(-1)). Undersaturation of CO2 prior to the TD due to dilution by freshwater and the preexisting cold eddy, and slow translation speed of the TD, are considered to account for the CO2 flux change.
  • [发表日期]:2014
  • [第一作者]:Sun, QY
  • [第一作者单位]:中科院南海所
  • [通讯作者]:Tang, DL
  • [通讯作者单位]:中科院南海所
  • [论文类型]:期刊
  • [期刊分类]:
  • [学科分类]:
  • [影响因子]:
  • [关键词]:sea-air CO2 flux; tropical depression; remote sensing; rain; uplifting
  • [卷号]:10
  • [期号]:119
  • [起止页码]:6792-6804
  • [简介]: 中科院南海所唐丹玲团队通过采集水文、生化和海水二氧化碳分压等数据,结合航次数据和卫星遥感数据综合分析,发现由于台风过境,南海南部局部海域发生了一个由强碳汇向弱碳源转变的过程。相关成果发表在海洋学Top期刊《地球物理研究-海洋》(J. Geophys. Res- Oceans, 2014, 119, 6792- 6804)。该成果有助于认识台风过程对于区域乃至全球海洋海气二氧化碳交换中的重要作用,理解全球碳循环以及台风与海洋的相互作用的,引起同行关注。