Air-sea CO₂ exchange in the Gulf of Bothnia, Baltic Sea

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• 作者：Annekatrin Lö ; ffler^a ; ^{annekatrin.loeffler@io-warnemuende.de} ; Bernd Schneider^a ; ^{bernd.schneider@io-warnemuende.de} ; Matti Perttilä ; ^b ; ^{matti.perttila@fmi.fi} ; Gregor Rehder^a ; ^{gregor.rehder@io-warenmuende.de}
• 关键词：Carbon dioxide ; Partial pressure ; Gas exchange ; Air&ndash ; sea-fluxes ; Gulf of Bothnia ; Baltic Sea
• 刊名：Continental Shelf Research
• 出版年：2012
• 期刊代码：18_02784343
• 类别：ear
• 出版时间：1 April, 2012
• 卷：37
• 期：Complete
• 页码：46-56
• 文件大小：1471 K

摘要

The surface water CO₂ partial pressure, pCO₂, was measured during nine cruises in the Gulf of Bothnia at different seasons between 1999 and 2010, with continuous recording during most of the cruises using a bubble-type equilibrator and infrared CO₂ detection. The data were used to construct the mean seasonality of the pCO₂ in characteristic sub-areas. The low pCO₂ measured in spring/summer and the high pCO₂ measured in fall/winter indicated that biological production, stratification, mineralization and deep mixing, controlled the seasonal pCO₂ cycle in both the Bothnian Bay and the Bothnian Sea. To calculate CO₂ exchange with the atmosphere, the gas exchange transfer velocity was computed as a function of wind speed according to . Based on the mean seasonal pCO₂ distribution, CO₂ fluxes were calculated, taking into account the differing wind conditions and the varying ice coverage. The resulting mean annual flux of +140 mmol m^鈭? yr^鈭? in the Bothnian Bay indicated that this area is a weak source for atmospheric CO₂. In contrast, the Bothnian Sea was found to act as a sink for atmospheric CO₂, with a mean flux of 鈭?30 mmol m^鈭? yr^鈭?.