| 基于卫星高度计的北极海冰厚度变化研究 |
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| 引用本文： | 毕海波,黄海军,苏乔,严立文,刘艳霞,徐秀丽.基于卫星高度计的北极海冰厚度变化研究[J].海洋学报(英文版),2014,33(11):134-140. |
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| 作者姓名： | 毕海波 黄海军 苏乔 严立文 刘艳霞 徐秀丽 |
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| 作者单位： | 中国科学院海洋研究所海洋地质与环境重点实验室, 青岛 266071, 中国;中国科学院海洋研究所海洋地质与环境重点实验室, 青岛 266071, 中国;国家海洋局第一海洋研究所, 青岛 266061, 中国;中国科学院海洋研究所海洋地质与环境重点实验室, 青岛 266071, 中国;中国科学院海洋研究所海洋地质与环境重点实验室, 青岛 266071, 中国;国家海洋局第一海洋研究所, 青岛 266061, 中国 |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41276082 and 41076031;the Nonprofit Research Project for the State Oceanic Administration of China under contract No.201005010-2 |
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| 摘 要： | A modified algorithm taking into account the first year(FY) and multiyear(MY) ice densities is used to derive a sea ice thickness from freeboard measurements acquired by satellite altimetry ICESat(2003–2008). Estimates agree with various independent in situ measurements within 0.21 m. Both the fall and winter campaigns see a dramatic extent retreat of thicker MY ice that survives at least one summer melting season. There were strong seasonal and interannual variabilities with regard to the mean thickness. Seasonal increases of 0.53 m for FY the ice and 0.29 m for the MY ice between the autumn and the winter ICESat campaigns, roughly 4–5 month separation, were found. Interannually, the significant MY ice thickness declines over the consecutive four ICESat winter campaigns(2005–2008) leads to a pronounced thickness drop of 0.8 m in MY sea ice zones. No clear trend was identified from the averaged thickness of thinner, FY ice that emerges in autumn and winter and melts in summer. Uncertainty estimates for our calculated thickness, caused by the standard deviations of multiple input parameters including freeboard, ice density, snow density, snow depth, show large errors more than 0.5 m in thicker MY ice zones and relatively small standard deviations under 0.5 m elsewhere. Moreover, a sensitivity analysis is implemented to determine the separate impact on the thickness estimate in the dependence of an individual input variable as mentioned above. The results show systematic bias of the estimated ice thickness appears to be mainly caused by the variations of freeboard as well as the ice density whereas the snow density and depth brings about relatively insignificant errors.
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| 关 键 词： | 北极海冰 厚度变化 卫星测高 现场测量 显示 海冰厚度 冬季运动 灵敏度分析 |
| 收稿时间： | 2014/1/22 0:00:00 |
| 修稿时间： | 2014/3/20 0:00:00 |
An Arctic sea ice thickness variability revealed from satellite altimetric measurements |
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| BI Haibo,HUANG Haijun,SU Qiao,YAN Liwen,LIU Yanxia and XU Xiuli.An Arctic sea ice thickness variability revealed from satellite altimetric measurements[J].Acta Oceanologica Sinica,2014,33(11):134-140. |
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| Authors: | BI Haibo HUANG Haijun SU Qiao YAN Liwen LIU Yanxia and XU Xiuli |
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| Affiliation: | 1.Key laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China2.The First Institute of Oceanology, State Oceanic Administration, Qingdao 266061, China |
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| Abstract: | A modified algorithm taking into account the first year (FY) and multiyear (MY) ice densities is used to derive a sea ice thickness from freeboard measurements acquired by satellite altimetry ICESat (2003-2008). Estimates agree with various independent in situ measurements within 0.21 m. Both the fall and winter campaigns see a dramatic extent retreat of thicker MY ice that survives at least one summer melting season. There were strong seasonal and interannual variabilities with regard to the mean thickness. Seasonal increases of 0.53 m for FY the ice and 0.29 m for the MY ice between the autumn and the winter ICESat campaigns, roughly 4-5 month separation, were found. Interannually, the significant MY ice thickness declines over the consecutive four ICESat winter campaigns (2005-2008) leads to a pronounced thickness drop of 0.8 m in MY sea ice zones. No clear trend was identified from the averaged thickness of thinner, FY ice that emerges in autumn and winter and melts in summer. Uncertainty estimates for our calculated thickness, caused by the standard deviations of multiple input parameters including freeboard, ice density, snow density, snow depth, show large errors more than 0.5 m in thicker MY ice zones and relatively small standard deviations under 0.5 m elsewhere. Moreover, a sensitivity analysis is implemented to determine the separate impact on the thickness estimate in the dependence of an individual input variable as mentioned above. The results show systematic bias of the estimated ice thickness appears to be mainly caused by the variations of freeboard as well as the ice density whereas the snow density and depth brings about relatively insignificant errors. |
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| Keywords: | satellite altimetry ice thickness Arctic first-year ice multiyear ice |
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