中文摘要：

利用中国第3次北极科学考察所布放海冰物质平衡浮标（Ice Mass-Balance buoy,IMB）的观测数据,分析了北冰洋中心区多年冰2008年8月—2009年7月温度与物质平衡的变化特征。结果表明,冰温廓线呈现明显的季节变化,秋季降温过程从海冰表面开始向冰体内部传播。海冰底部的生长/消融率受海水温度控制,随水温的降低,在2月初达到的最大值为1.7 cm/d;在2008年10月中旬至2009年6月下旬为海冰的生长期内,海冰底部平均生长率为0.6 cm/d,海冰底部厚度增长量为160.3 cm;海冰底部的消融较海冰表面约有1个月的滞后。分析海面风场对海冰漂移的影响显示,海冰漂移速率约为风速的2.13%。

英文摘要：

As the integrator of both the surface heat budget and the ocean heat flux,the mass balance of sea ice is a key climate-change indicator.A set of IMB（Ice Mass-balance Buoy） was deployed in the central Arctic Ocean during the 3rd arctic research expedition of China.Analysis of 11 months＇data from August 2008 to July 2009 shows that aseasonal cycle is obvious on the temperature of sea ice.With the air temperature decreases,a cold front propagates down through the ice in the fall.The growth/ablation rate of sea ice bottom is mainly controled by water temperature below,and reaches its maximum 1.7 cm/d in the early February.Growth season of sea ice bottom lasts from the middle October in 2008 to the end June in 2009,with an average bottom growth rate of 0.6 cm/d and total sea ice growth of 160.3 cm.Bottom melting begins in the early July,being one-month lag when comparing with surface melting.Correlation analysis between the daily ice drift and the 10m wind gives a correlation coefficient of 0.14（99% significance）,ice moves at 2.13% of the wind speed.