Evaluation of the HadISST1 and NSIDC 1850 onward sea ice datasets with a focus on the Barents-Kara seas  

作　　者：Rui-Bo WANG Shuanglin LI Zhe HAN 

机构地区：[1]College of Atmospheric Sciences, Chengdu University of Information Technology [2]Climate Change Research Center and Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences [3]College of Earth Science, The University of Chinese Academy of Sciences [4]CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2018年第5期388-395,共8页大气和海洋科学快报（英文版）

基　　金：jointly supported by the National Natural Science Foundation of China [grant numbers 41790473 and41421004];the Strategic Priority Research Program of the Chinese Academy of Sciences [grant number XDA19070402]

摘　　要：In recent years,long-term continuous sea-ice datasets have been developed,and they cover the periods before and after the satellite era.How these datasets differ from one another before the satellite era,and whether one is more reliable than the other,is important but unclear because the sea-ice record before 1979 is sparse and not continuous.In this letter,two sets of sea-ice datasets are evaluated:one is the HadISST1 dataset from the Hadley Centre,and the other is the SIBT1850(Gridded Monthly Sea Ice Extent and Concentration,from 1850 Onward)dataset from the National Snow and Ice Data Center(NSIDC).In view of its substantial importance for climate,the winter sea ice in the Barents and Kara seas(BKS)is of particular focus.A reconstructed BKS sea-ice extent(SIE)is developed using linear regression from the mean of observed surface air temperature at two adjacent islands,Novaya Zemlya and Franz Josef Land(proxy).One validation illustrates that the proxy is substantially coherent with the BKS sea-ice anomaly in the observations and the CMIP5(phase 5 of the Coupled Model Intercomparison Project)historical experiments.This result indicates that the proxy is reasonable.Therefore,the establishment of the reconstructed BKS SIE is also reasonable.The evaluation results based on the proxy suggest that the sea-ice concentration prior to the satellite era in the NSIDC dataset is more realistic and reliable than that in the Hadley Centre dataset,and thus is more appropriate for use.评估HadISST1和NSIDC 1850 onward两套海冰数据在巴伦支海和喀拉海的数据质量。近年来发展出覆盖卫星观测前后较长时间的海冰数据。这些数据在卫星观测前彼此之间有怎样的不同,是否一个数据要比另一个数据更可信,是很重要但还不清楚的问题。本文评估了两套海冰数据:一套是Hadley中心的,一套是NSIDC的。考虑到巴伦支海和喀拉海的冬季海冰对气候的重要影响故对其进行评估。用线性回归的方法通过在BKS附近的新地岛和法兰是约瑟夫地群岛上的气温建立一个海冰代用指数。代用指数和BKS的海冰的变化有较好的一致性。基于代用指数的评估表明在卫星观测前,NSIDC海冰数据比哈德莱中心的更真实可信,更适合应用。

关 键 词：EVALUATION sea-ice dataset NSIDC Hadley Centre PROXY 

分 类 号：P[天文地球]