摘要
利用国际北极浮冰运动观测资料 (IABP)(1979～1998)以及NCEP/NCAR月平均海平面气压再分析资料(1960～2002), 通过求解海冰运动异常的复斜方差矩阵, 研究了冬季北极海冰运动主模态构成及其与海平面气压变化的关系.冬季海冰运动主模态是由两个海冰运动优势模态的一个线性组合构成, 与这两个运动优势模态有直接关系的海平面气压变化主要发生在北极海盆及其边缘海区.尽管北极涛动(北大西洋涛动)通过影响海平面气压进而影响北极海冰运动, 但是, 北极涛动(北大西洋涛动)并不是决定海冰运动主模态的关键性因素.
Using monthly mean SLP （sea level pressure） data obtained from the National Center for Environmental Prediction （NCEP） and the National Center for Atmospheric Research （NCAR） reanalysis datasets during the peri- od of 1960 - 2002, and monthly sea ice motion data obtained from International Arctic Buoy Programme （IABP） dataset during the period 1979- 1998, this paper investigates the forming of the leading mode of winter Arctic sea ice motion and its relationship with SLP variations in terms of resolving a complex covariance matrix of sea ice motion anomalies. Although this study cannot provide exactly the spatial distribution of the leading mode because of the complexity of two-dimensional sea ice motion, it reveals an important information that the leading mode of winter sea ice motion is a linear combination of two dominant modes occurring in sea ice motion, and SLP variations which is directly associated with the two dominant modes of sea ice motion occur in the Arctic Basin and its marginal seas. Although the winter Arctic Oscillation/North Atlantic Oscillation （AO/NAO） can affect Arctic sea ice motion through influencing SLP, the AO （NAO） is not a crucial factor determining the leading mode of winter Arctic sea ice motion.
出处
《大气科学》
CSCD
北大核心
2005年第5期747-760,共14页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目40475030和40225012
关键词
海冰运动
主模态
海平面气压异常
北极涛动
sea ice motion, leading mode, sea level pressure anomaly, Arctic Oscillation
