| BI Haibo,FU Min,SUN Ke,LIU Yilin,XU Xiuli,HUANG Haijun. 2016. Arctic sea ice thickness changes in terms of sea ice age. Acta Oceanologica Sinica, 35(10):1－10 |
| Arctic sea ice thickness changes in terms of sea ice age |
| 北极地区不同冰龄的海冰厚度变化研究 |
| Received:August 15, 2015 Revised:December 31, 2015 |
| DOI：10.1007/s13131-016-0922-x |
| Key words:sea ice thickness age ICESat PIOMAS |
| 中文关键词: |
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| Author Name | Affiliation | E-mail | | BI Haibo | Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | bhb@qdio.ac.cn | | FU Min | National Marine Environmental Forecasting Center, Beijing 100081, China | | | SUN Ke | The First Institute of Oceanology, State Oceanic Administration, Qingdao 266061, China | | | LIU Yilin | Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | | | XU Xiuli | National Marine Environmental Forecasting Center, Beijing 100081, China | | | HUANG Haijun | Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | |
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| Abstract: |
| In this study, changes in Arctic sea ice thickness for each ice age category were examined based on satellite observations and modelled results. Interannual changes obtained from Ice, Cloud, and Land Elevation Satellite (ICESat)-based results show a thickness reduction over perennial sea ice (ice that survives at least one melt season with an age of no less than 2 year) up to approximately 0.5-1.0 m and 0.6-0.8 m (depending on ice age) during the investigated winter and autumn ICESat periods, respectively. Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS)-based results provide a view of a continued thickness reduction over the past four decades. Compared to 1980s, there is a clear thickness drop of roughly 0.50 m in 2010s for perennial ice. This overall decrease in sea ice thickness can be in part attributed to the amplified warming climate in north latitudes. Besides, we figure out that strongly anomalous southerly summer surface winds may play an important role in prompting the thickness decline in perennial ice zone through transporting heat deposited in open water (primarily via albedo feedback) in Eurasian sector deep into a broader sea ice regime in central Arctic Ocean. This heat source is responsible for enhanced ice bottom melting, leading to further reduction in ice thickness. |
| 中文摘要: |
| 本文基于卫星遥感数据反演的海冰厚度（ICESat：2003-2008）以及PIOMAS模型数据对北极地区不同年龄海冰的厚度变化进行了研究。基于卫星数据的研究结果表明，在ICESat卫星运行期间，依冰龄的不同，海冰厚度在秋季和冬季分别大致减少了0.5~1.0m 和0.6~0.8m。基于PIOMAS模型模拟长时序海冰厚度表明，常年冰在2010s相较于1980s下降了大概0.5m，而一年冰厚度变化不明显。海冰厚度的整体下降重要原因之一在于北极地区气候的不断变暖。此外，本文研究还证实了夏季风在导致常年冰海冰厚度下降中起到重要作用。进入21世纪以来，北冰洋西部出现较大范围海冰融化现象。这些地区能够吸收大量的太阳能，导致海水表面温度升高。夏季风在适当的条件下，可以将北冰洋西部海水运移至东部，加剧东部海冰底部升温、融化，从而导致海冰厚度减小。 |
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