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| Air-sea carbon fluxes and their controlling factors in the Prydz Bay in the Antarctic | |
| 作者姓名： | GAO Zhongyong CHEN Liqi GAO Yuan |
| 作者单位： | Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Chinese Arctic and Antarctic Administration, Beijing 100860, China;Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Department of Earth and Environmental Sciences, Rutgers University, Newark, NJ USA |
| 基金项目： | 国家自然科学基金，Polar Strategy Foundation，国家重点科研发展项目，福建省青年科技人才创新基金，福建省自然科学基金，TIOSOA Foundation |
| 摘 要： | The Prydz Bay in the Antarctic is an important area in the Southern Ocean due to its unique geographic feature. It plays an important role in the carbon cycle in the Southern Ocean. To investigate the distributions of carbon dioxide in the atmosphere and surface seawater and its air-sea exchange rates in this region, the Chinese National Antarctic Research Expedition （CHINARE） had set up several sections in the Prydz Bay. Here we present the results from the CHINARE-XVI cruises were presented onboard R/V Xue/ong from November 1999 to April 2000 and the main driving forces were discussed controlling the distributions of partial pressure of carbon dioxide. According to the partial pressure of carbon dioxide distributions, the Prydz Bay can be divided into the inside and outside regions. The partial pressure of carbon dioxide was low in the inside region but higher in the outside region during the measurement period. This distribution had a good negative correlation with the concentrations of ehlorophyll-a in general, suggesting that the partial pressure of carbon dioxide was substantially affected by biological production. The results also indicate that the biological produetion is most likely the main driving force in the marginal ice zone in the Southern Ocean in summer. However, in the Antarctic divergence sector of the Prydz Bay （about 64°S）, the hydrological processes become the controlling factor as the sea surface partial pressure of carbon dioxide is much higher than the atmospheric one due to the upwelling of the high DIC CDW, and this made the outside of Prydz Bay a source of carbon dioxide. On the basis of the calculations, the CO2 flux in January （austral summer） was -3.23 mmol/（m^2 · d） in the inner part of Prydz Bay, i.e. , a sink of atmospheric CO2, and was 0.62 mmol/（m^2 · d） in the outside part of the bay, a weak source of atmospheric CO2. The average air-sea flux of CO2 in the Prydz Bay was 2.50 mmol/（m^2 · d）. |
| 关 键 词： | 二氧化碳 海湾 控制因素 南极 |
| 收稿时间： | 2007/7/13 0:00:00 |
| 修稿时间： | 1/6/2008 12:00:00 AM |
Air-sea carbon fluxes and their controlling factors in the Prydz Bay in the Antarctic |
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| GAO Zhongyong,CHEN Liqi,GAO Yuan.Air-sea carbon fluxes and their controlling factors in the Prydz Bay in the Antarctic[J].Acta Oceanologica Sinica,2008,27(3):136-146. | |
| Authors: | GAO Zhongyong CHEN Liqi and GAO Yuan |
| Affiliation: | 1. Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Ocea-nography, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005,China 2. Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Ocea-nography, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005,China;Chinese Arctic and Antarctic Administration, Beijing 100860,China 3. Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration, Third Institute of Ocea-nography, State Oceanic Administration, Xiamen 361005, China;Department of Earth and Environmental Sciences, Rutgers University, Newark, NJ USA |
| Abstract: | The Prydz Bay in the Antarctic is an important area in the Southern Ocean due to its unique geographic feature. It plays an important role in the carbon cycle in the Southern Ocean. To investigate the distributions of carbon dioxide in the atmosphere and surface sea-water and its air-sea exchange rates in this region, the Chinese National Antarctic Research Expedition (CHINARE) had set up sev-eral sections in the Prydz Bay. Here we present the results from the CHINARE--XVI cruises were presented onboard R/V Xuelong from November 1999 to April 2000 and the main driving forces were discussed controlling the distributions of partial pressure of car-bon dioxide. According to the partial pressure of carbon dioxide distributions, the Prydz Bay can be divided into the inside and out-side regions. The partial pressure of carbon dioxide was low in the inside region but higher in the outside region during the measure-ment period. This distribution had a good negative correlation with the concentrations of chlorophyll-a in general, suggesting that the partial pressure of carbon dioxide was substantially affected by biological production. The results also indicate that the biological pro-duction is most likely the main driving force in the marginal ice zone in the Southern Ocean in summer. However, in the Antarctic divergence sector of the Prydz Bay (about 64°S), the hydrological processes become the controlling factor as the sea surface partialp ressure of carbon dioxide is much higher than the atmospheric one due to the upwelling of the high DIC CDW, and this made the outside of Prydz Bay a source of carbon dioxide. On the basis of the calculations, the CO2 flux in January (austral summer) was 3.23 mmol/(m2·d) in the inner part of Prydz Bay, I.e.,a sink of atmospheric CO2,and was 0.62 mmol/(m2·d) in the outside part of the bay, a weak source of atmospheric CO2.The average air-sea flux of CO2 in the Prydz Bay was 2.50 mmol/(m2·d). |
| Keywords: | Prydz Bay carbon flux carbon dioxide controlling factors |
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