利用CryoSat-2測高數(shù)據(jù)研究東南極PANDA斷面考察沿線高程變化
發(fā)布時間:2018-08-31 15:32
【摘要】:衛(wèi)星測高技術(shù)是研究兩極冰面高程變化和物質(zhì)平衡狀態(tài)的主要手段。相對于傳統(tǒng)高度計,CryoSat-2不僅能夠提供更加密集的軌道覆蓋,同時也提高了南極邊緣地區(qū)的測量精度。但369d的重訪周期也使得傳統(tǒng)的基于交叉軌道算法的時序分析不再適用,通過對CryoSat-2軌跡特征的分析,提出了基于近重復(fù)軌道的冰面高程變化模型。針對CryoSat-2數(shù)據(jù)預(yù)處理,采用基于地表模型的粗差剔除方法進(jìn)行了粗差剔除,并基于EnviSat與CryoSat-2的協(xié)同分析,對CryoSat-2中的后向散射能量進(jìn)行了系統(tǒng)變化趨勢改正。利用2012-01~2014-05的CryoSat-2數(shù)據(jù),對東南極PANDA斷面考察沿線冰面高程變化進(jìn)行了研究。實(shí)驗(yàn)結(jié)果表明,整個考察沿線高程變化趨勢為0.017±0.009m/a。該結(jié)論與其他學(xué)者提取相應(yīng)流域的平均積累率相一致。但其分布不均勻,局部效應(yīng)明顯。通過與考察線路實(shí)測結(jié)果對比,兩者在相對積累特征上基本一致。
[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 However, the repeated visit period of 369d makes the traditional time series analysis based on cross orbit algorithm no longer applicable.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 鹵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.
【作者單位】: 武漢大學(xué)中國南極測繪研究中心;武漢大學(xué)極地測繪科學(xué)國家測繪地理信息局重點(diǎn)實(shí)驗(yàn)室;武漢大學(xué)測繪遙感信息工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:中國南北極環(huán)境綜合考察與評估專項(CHINARE2015-02-04) 中國測繪地理信息公益性行業(yè)科研專項(201412009) 中國極地科學(xué)戰(zhàn)略研究基金(20120107) 民用航天"十二五"預(yù)先研究項目(D040103) 國家自然科學(xué)基金(41376187)~~
【分類號】:P228.3
本文編號: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 鹵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.
【作者單位】: 武漢大學(xué)中國南極測繪研究中心;武漢大學(xué)極地測繪科學(xué)國家測繪地理信息局重點(diǎn)實(shí)驗(yàn)室;武漢大學(xué)測繪遙感信息工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:中國南北極環(huán)境綜合考察與評估專項(CHINARE2015-02-04) 中國測繪地理信息公益性行業(yè)科研專項(201412009) 中國極地科學(xué)戰(zhàn)略研究基金(20120107) 民用航天"十二五"預(yù)先研究項目(D040103) 國家自然科學(xué)基金(41376187)~~
【分類號】:P228.3
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