Studies of the Antarctic sea ice edge and ice extent from satellite and ship observations
Studies of the Antarctic sea ice edge and ice extent from satellite and ship observations
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DOI：
10.1016/j.rse.2004.05.007
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发表时间：
2004-07-15
影响因子：
13.5
通讯作者：
Comiso, JC
中科院分区：
文献类型：
--
作者：
Worby, AP;Comiso, JC
被动微波派生的冰边缘位置在南极洲进行评估，对1989年和2000年之间的船舶在现场观测。在生长季节（3月至10月），船舶数据与卫星数据非常一致，Bootstrap和Team算法的r（2）值分别为0.99和0.97。在融化季节（11月至次年2月），与被动微波冰缘（通常位于观测点以南1- 20度）的一致性不太好。这是由于冰的低浓度和饱和性质，对于Bootstrap和Team算法，这一时期的r（2）值分别为0.92和0.80。敏感性研究表明，夏季冰缘位置的这种偏移会给南大洋海冰覆盖范围的趋势研究造成重大误差。船舶观测到的冰缘被动微波冰浓度变化很大，Team算法的平均值为14%，Bootstrap算法的平均值为19%。被动微波数据和合成孔径雷达，陆地卫星和OLS数据在冰生长季节的比较表明，虽然小规模的细节在冰边缘位置丢失，被动微波数据一般提供良好的和一致的代表性较高的分辨率图像。(C)2004年爱思唯尔公司All rights reserved.
Passive microwave-derived ice edge locations in the Antarctic are assessed against in situ observations from ships between 1989 and 2000. During the growth season (March-October), the ship data agrees with satellite data very well, with r(2) values of 0.99 and 0.97 for the Bootstrap and Team algorithms, respectively. During the melt season (November-February), the agreement is not so good with the passive microwave ice edge typically 1-2degrees of latitude south of the observations. This is due to the low concentration and saturated nature of the ice, and the r(2) values for this period are 0.92 and 0.80 for the Bootstrap and Team algorithms, respectively. Sensitivity studies show that such an offset in the summer ice edge location can cause significant errors in trend studies of the extent of sea ice cover in the Southern Ocean. The passive microwave ice concentration at the ice edge observed by ship varies greatly, averaging 14% for the Team algorithm and 19% for the Bootstrap. Comparisons between passive microwave data and SAR, Landsat and OLS data during the ice growth season show that while small-scale details in ice edge location are lost, the passive microwave data generally provide good and consistent representation of the higher resolution imagery. (C) 2004 Elsevier Inc. All rights reserved.