摘要
利用美国冰雪中心(NSIDC)资料分析2010年夏季中国第4次北极科学考察期间北极海冰的冰情变化,并通过NCEP再分析资料对同时期的大气环流演变进行分析,发现6月与8月环流形势为偶极子正异常,加速了海冰的融化,其中2010年6月的海冰覆盖范围达到有历史记录以来的6月最低值;7月为低压控制,减缓了海冰覆盖范围的进一步减少;2010年8月北极区域出现冰间水道和冰间湖,跨越极点由太平洋一侧到大西洋一侧,大范围区域内海冰密集度小于80%。由此可见,2010年夏季海冰覆盖范围及密集度变化主要受同期大气环流场的影响。此外,简单指出西北通道北线冰提前融化是由春季北极加拿大区域气温异常偏高引起。
Based on data from the National Sea Ice Data Center （NSIDC）, we present the Arctic sea ice extent and concentration during the Fourth Chinese Arctic Research Expedition of 2010, and analyze the corresponding atmospheric circulation using NCEP/NCAR reanalysis data. It is found that the positive dipole anomaly increased ice melt rates in June and August. The ice extent in June reached the minimum of historical records. The melt rate was reduced in July because of the control of low pressure. In August, leads and polynyas appeared in the central Arctic area spanning the North Pole, from Pacific Ocean to Atlantic Ocean, where ice concentration was less than 80%. We therefore conclude that ice extent and concentration were significantly affected by the atmospheric circulation. Additionally, the earlier clearing of sea ice along the Northwest Passage was caused by abnormally high springtime temperatures in the Canadian Arctic area.
出处
《极地研究》
CAS
CSCD
北大核心
2011年第3期205-216,共12页
Chinese Journal of Polar Research
基金
国家重点自然基金(40930848
40906099)
863项目(2008AA121704)资助
