利用CryoSat-2测高数据研究东南极PANDA断面考察沿线高程变化
发布时间：2018-08-31 15:32
【摘要】：卫星测高技术是研究两极冰面高程变化和物质平衡状态的主要手段。相对于传统高度计,CryoSat-2不仅能够提供更加密集的轨道覆盖,同时也提高了南极边缘地区的测量精度。但369d的重访周期也使得传统的基于交叉轨道算法的时序分析不再适用,通过对CryoSat-2轨迹特征的分析,提出了基于近重复轨道的冰面高程变化模型。针对CryoSat-2数据预处理,采用基于地表模型的粗差剔除方法进行了粗差剔除,并基于EnviSat与CryoSat-2的协同分析,对CryoSat-2中的后向散射能量进行了系统变化趋势改正。利用2012-01~2014-05的CryoSat-2数据,对东南极PANDA断面考察沿线冰面高程变化进行了研究。实验结果表明,整个考察沿线高程变化趋势为0.017±0.009m/a。该结论与其他学者提取相应流域的平均积累率相一致。但其分布不均匀,局部效应明显。通过与考察线路实测结果对比,两者在相对积累特征上基本一致。
[Abstract]:Satellite altimetry is the main method to study the height change and mass balance of polar ice. Compared with the conventional altimeter CryoSat-2 can not only provide more dense orbital coverage but also improve the measurement accuracy of the Antarctic marginal area. However, the repeated visit period of 369d makes the traditional time series analysis based on cross orbit algorithm no longer applicable. By analyzing the characteristics of CryoSat-2 trajectory, a model of ice elevation variation based on near-repeated orbit is proposed. Aiming at the pretreatment of CryoSat-2 data, the gross error elimination method based on surface model is used to eliminate gross error. Based on the cooperative analysis of EnviSat and CryoSat-2, the trend of backward scattering energy in CryoSat-2 is corrected systematically. Based on the CryoSat-2 data of 2012-01 and 2014-05, the elevation changes of ice surface along the PANDA cross-section of East Antarctica are studied. The experimental results show that the variation trend of elevation along the whole survey is 0.017 卤0.009 m / a. This conclusion is consistent with the average accumulation rate of the corresponding watershed extracted by other scholars. But its distribution is not uniform, the local effect is obvious. By comparing with the observed results of the observed lines, the characteristics of the relative accumulation between the two are basically the same.
【作者单位】： 武汉大学中国南极测绘研究中心;武汉大学极地测绘科学国家测绘地理信息局重点实验室;武汉大学测绘遥感信息工程国家重点实验室;
【基金】：中国南北极环境综合考察与评估专项(CHINARE2015-02-04) 中国测绘地理信息公益性行业科研专项(201412009) 中国极地科学战略研究基金(20120107) 民用航天"十二五"预先研究项目(D040103) 国家自然科学基金(41376187)~~
【分类号】：P228.3
本文编号：2215415
[Abstract]:Satellite altimetry is the main method to study the height change and mass balance of polar ice. Compared with the conventional altimeter CryoSat-2 can not only provide more dense orbital coverage but also improve the measurement accuracy of the Antarctic marginal area. However, the repeated visit period of 369d makes the traditional time series analysis based on cross orbit algorithm no longer applicable. By analyzing the characteristics of CryoSat-2 trajectory, a model of ice elevation variation based on near-repeated orbit is proposed. Aiming at the pretreatment of CryoSat-2 data, the gross error elimination method based on surface model is used to eliminate gross error. Based on the cooperative analysis of EnviSat and CryoSat-2, the trend of backward scattering energy in CryoSat-2 is corrected systematically. Based on the CryoSat-2 data of 2012-01 and 2014-05, the elevation changes of ice surface along the PANDA cross-section of East Antarctica are studied. The experimental results show that the variation trend of elevation along the whole survey is 0.017 卤0.009 m / a. This conclusion is consistent with the average accumulation rate of the corresponding watershed extracted by other scholars. But its distribution is not uniform, the local effect is obvious. By comparing with the observed results of the observed lines, the characteristics of the relative accumulation between the two are basically the same.
【作者单位】： 武汉大学中国南极测绘研究中心;武汉大学极地测绘科学国家测绘地理信息局重点实验室;武汉大学测绘遥感信息工程国家重点实验室;
【基金】：中国南北极环境综合考察与评估专项(CHINARE2015-02-04) 中国测绘地理信息公益性行业科研专项(201412009) 中国极地科学战略研究基金(20120107) 民用航天"十二五"预先研究项目(D040103) 国家自然科学基金(41376187)~~
【分类号】：P228.3
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