Historical variability of sea ice edge position in the Nordic Seas
Historical variability of sea ice edge position in the Nordic Seas
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DOI：
10.1029/2004jc002851
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发表时间：
2006-01-05
影响因子：
3.6
通讯作者：
Dick, C
中科院分区：
文献类型：
--
作者：
Divine, DV;Dick, C
[1]在北欧海域从4月到8月的历史冰观测被用来构建时间序列的冰边缘位置异常跨越1750 - 2002年期间。虽然分析表明，在这一期间，年际变化几乎保持不变，但有证据表明，冰盖的波动周期约为60至80年和20至30年，叠加在持续的负趋势之上。格陵兰海的低频振荡更为突出，而巴伦支海的高频振荡占主导地位。分析表明，最近有充分记录的冰盖退缩部分可归因于60 - 80年变率的正阶段的表现，这与北大西洋和北极的次极地变暖有关。自19世纪后半叶以来观测到的冰缘位置的持续后退可能是早在18世纪后半叶在研究区域发生显著冷却后的恢复。
[1] Historical ice observations in the Nordic Seas from April through August are used to construct time series of ice edge position anomalies spanning the period 1750 - 2002. While analysis showed that interannual variability remained almost constant throughout this period, evidence was found of oscillations in ice cover with periods of about 60 to 80 years and 20 to 30 years, superimposed on a continuous negative trend. The lower frequency oscillations are more prominent in the Greenland Sea, while higher frequency oscillations are dominant in the Barents. The analysis suggests that the recent well-documented retreat of ice cover can partly be attributed to a manifestation of the positive phase of the 60 - 80 year variability, associated with the warming of the subpolar North Atlantic and the Arctic. The continuous retreat of ice edge position observed since the second half of the 19th century may be a recovery after significant cooling in the study area that occurred as early as the second half of the 18th century.