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Variation of upper-ocean heat content in the Canada Basin in summers of 2003 and 2008

【标题】Variation of upper-ocean heat content in the Canada Basin in summers of 2003 and 2008

【Title】Variation of upper-ocean heat content in the Canada Basin in summers of 2003 and 2008

【作者】 钟文理; 赵进平

【Author】

【期刊】极地研究

【Journal】

【期刊年份】2011

【卷】22

【期】

【关键词】

【Keywords】 Heat content; freshwater content; NSTM; melting sea ice; Pacific inflow water

【摘要】Conductivity, temperature, and depth (CTD) data collected during summers of 2003 and 2008 were used to study upper-ocean heat content(which refers to the heat content of the top 200 m in this study) of the Canada Basin. The variation of heat content at depth, the heat content differences between these two summers, the main driving factors, and horizontal spatial scale differences were analyzed. The catastrophic reduction of sea ice cover in the Canada Basin was significant when comparing 2003 with 2008, suggesting that more solar radiation was absorbed in the upper ocean during summer of 2008. On the other hand, the reduction of sea ice resulted in more freshwater for the upper ocean. Thus, the properties of sea water were changed. Our study shows that the huge reduction of sea ice would result in two changes: a general increase of the upper-ocean heat content, and an increase of the Pacific inflow water in the Canada Basin. The Near Surface Temperature Maximum (NSTM) water was also analyzed as it is an indicator of the Arctic Ocean warming.

【Abstract】Conductivity, temperature, and depth (CTD) data collected during summers of 2003 and 2008 were used to study upper-ocean heat content(which refers to the heat content of the top 200 m in this study) of the Canada Basin. The variation of heat content at depth, the heat content differences between these two summers, the main driving factors, and horizontal spatial scale differences were analyzed. The catastrophic reduction of sea ice cover in the Canada Basin was significant when comparing 2003 with 2008, suggesting that more solar radiation was absorbed in the upper ocean during summer of 2008. On the other hand, the reduction of sea ice resulted in more freshwater for the upper ocean. Thus, the properties of sea water were changed. Our study shows that the huge reduction of sea ice would result in two changes: a general increase of the upper-ocean heat content, and an increase of the Pacific inflow water in the Canada Basin. The Near Surface Temperature Maximum (NSTM) water was also analyzed as it is an indicator of the Arctic Ocean warming.

【基金/项目】 北极环极边界流的结构及其对气候变化贡献的研究

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