| LI Shujiang,ZHAO Jinping,SU Jie,CAO Yong. 2012. Warming and depth convergence of the Arctic Intermediate Water in the Canada Basin during 1985-2006. Acta Oceanologica Sinica, (4):46－54 |
| Warming and depth convergence of the Arctic Intermediate Water in the Canada Basin during 1985-2006 |
| Warming and depth convergence of the Arctic Intermediate Water in the Canada Basin during 1985-2006 |
| Received:April 02, 2010 Revised:February 24, 2012 |
| DOI：10.1007/s13131-012-0219-7 |
| Key words:Arctic Intermediate Water Canada Basin warming interannual variation convergence of AIW depth |
| 中文关键词: Arctic Intermediate Water Canada Basin warming interannual variation convergence of AIW depth |
| 基金项目:The National Natural Science Foundation of China under contract Nos 40631006 and 40876003; the Polar Science Youth Innovational Foundation of China under contract No. 20080221; the National Key Basic Research Program "973" of China under contract No. 2010CB950301. |
| Author Name | Affiliation | E-mail | | LI Shujiang | Ocean University of China, Qingdao 266100, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | lisj@fio.org.cn | | ZHAO Jinping | Ocean University of China, Qingdao 266100, China | | | SU Jie | Ocean University of China, Qingdao 266100, China | | | CAO Yong | Ocean University of China, Qingdao 266100, China | |
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| Abstract: |
| The warming of the Arctic Intermediate Water (AIW) is studied based on the analyses of hydrographic observations in the Canada Basin of the Arctic Ocean during 1985-2006. It is shown that how the anomalously warm AIW spreads in the Canada Basin during the observation time through the analysis of the AIW temperature spatial distribution in different periods. The results indicate that by 2006, the entire Canada Basin has almost been covered by the warming AIW. In order to study interannual variability of the AIW in the Canada Basin, the Canada Basin is divided into five regions according to the bottom topography. From the interannual variation of AIW temperature in each region, it is shown that a cooling period follows after the warming event in upstream regions. At the Chukchi Abyssal Plain and Chukchi Plateau, upstream of the Arctic Circumpolar Boundary Current (ACBC) in the Canada Basin, the AIW temperature reached maximum and then started to fall respectively in 2000 and 2002. However, the AIW in the Canada Abyssal Plain and Beaufort Sea continues to warm monotonically until the year 2006. Furthermore, it is revealed that there is convergence of the AIW depth in the five different regions of the Canada Basin when the AIW warming occurs during observation time. The difference of AIW depth between the five regions of the Canada Basin is getting smaller and smaller, all approaching 410 m in recent years. The results show that depth convergence is related to the variation of AIW potential density in the Canada Basin. |
| 中文摘要: |
| The warming of the Arctic Intermediate Water (AIW) is studied based on the analyses of hydrographic observations in the Canada Basin of the Arctic Ocean during 1985-2006. It is shown that how the anomalously warm AIW spreads in the Canada Basin during the observation time through the analysis of the AIW temperature spatial distribution in different periods. The results indicate that by 2006, the entire Canada Basin has almost been covered by the warming AIW. In order to study interannual variability of the AIW in the Canada Basin, the Canada Basin is divided into five regions according to the bottom topography. From the interannual variation of AIW temperature in each region, it is shown that a cooling period follows after the warming event in upstream regions. At the Chukchi Abyssal Plain and Chukchi Plateau, upstream of the Arctic Circumpolar Boundary Current (ACBC) in the Canada Basin, the AIW temperature reached maximum and then started to fall respectively in 2000 and 2002. However, the AIW in the Canada Abyssal Plain and Beaufort Sea continues to warm monotonically until the year 2006. Furthermore, it is revealed that there is convergence of the AIW depth in the five different regions of the Canada Basin when the AIW warming occurs during observation time. The difference of AIW depth between the five regions of the Canada Basin is getting smaller and smaller, all approaching 410 m in recent years. The results show that depth convergence is related to the variation of AIW potential density in the Canada Basin. |
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