The Air-Sea Exchange of CO2 in the East Sea (Japan Sea)

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• 作者：Dong-Chan Oh ; Mi-Kyung Park ; Sang-Hwa Choi ; Dong-Jin Kang ; Sun Young Park ; Jeom Shik Hwang ; Andrey Andreev ; Gi Hoon Hong and Kyung-Ryul Kim
• 关键词：Surface fCO2 in the East (Japan) Sea ; air ; sea CO2 flux ; seasonal variability of fCO2 ; solubility pump ; gas ; exchange model
• 刊名：Journal of Oceanography
• 出版时间：1999
• 出版年：1999
• 期刊代码：11_09168370
• 类别：eco
• 卷：55
• 期：2
• 页码：157-169
• 数据来源：sp

摘要

During CREAMS expeditions, fCO₂ for surface waters was measured continuously along the cruise tracks. The fCO₂ in surface waters in summer varied in the range 320–440 碌atm, showing moderate supersaturation with respect to atmospheric CO₂. In winter, however, fCO₂ showed under-saturation of CO₂ in most of the area, while varying in a much wider range from 180 to 520 碌atm. Some very high fCO₂ values observed in the northern East Sea (Japan Sea) appeared to be associated with the intensive convection system developed in the area. A gas-exchange model was developed for describing the annual variation of fCO₂ and for estimating the annual flux of CO₂ at the air-sea interface. The model incorporated annual variations in SST, the thickness of the mixed layer, gas exchange associated with wind velocity, biological activity and atmospheric concentration of CO₂. The model shows that the East Sea releases CO₂ into the atmosphere from June to September, and absorbs CO₂ during the rest of the year, from October through May. The net annual CO₂ flux at the air-sea interface was estimated to be 0.032 (卤0.012) Gt-C per year from the atmosphere into the East Sea. Water column chemistry shows penetration of CO₂ into the whole water column, supporting a short turnover time for deep waters in the East Sea.