Variability and Trends in Antarctic Sea Ice

通过模拟和数据同化研究，华盛顿大学的研究人员试图协调整个现代卫星观测时代(1979年至今)关于南极海冰及其与上层海洋和大气相互作用的信息。将审议根据在南环状模式中观察到的模式假定的南极气候变化和多变性的联系，在气候变暖的情况下南极海冰面积可能出现积极趋势的机制，以及关于南极冰-海系统可能如何应对不断变化的大气环流的估计。研究中使用的模式是全球冰洋模拟和同化系统(GIOMAS；http://psc.apl.washington.edu/zhang/Global_seaice)，)，这是一个耦合的全球海洋/冰/大气模式。对该模式的技术改进包括更新适用于南极冰洋系统的GIOMAS模式物理；使用NCEP/NCAR和ERA-40再分析数据来驱动大气强迫，并将通过数值实验估计气候和生态系统研究界感兴趣的参数，如南极海冰厚度、开阔水域、雪深、表面温度等。

AbstractThrough modeling and data assimilation studies, University of Washington researchers seek to reconcile information on Antarctic sea ice and its interaction with the upper ocean and the atmosphere, throughout the modern era of satellite observation (1979 to present). Links to changes and variability in Antarctic climate postulated in terms of the patterns observed in the Southern Annular Mode, mechanisms of likely positive trends in Antarctic sea ice extent in an otherwise warming climate, and estimates of how the Antarctic ice-ocean system may respond to changing atmospheric circulation will be considered. The model to be used in the study is the Global Ice-Ocean Modeling and Assimilation System (GIOMAS; http://psc.apl.washington.edu/zhang/Global_seaice), a coupled global ocean/ice/atmosphere model. Technical improvements to this model include an update of the GIOMAS model physics appropriate to the Antarctic ice-ocean system; use of NCEP/NCAR and ERA-40 reanalysis data to drive atmospheric forcing, and, through numerical experiments, estimates of parameters such Antarctic sea ice thickness, open water, snow depth, surface temperatures etc of interest to the climate and ecosystem research communities will be made."This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."