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冰川冻土 ›› 2019, Vol. 41 ›› Issue (1): 19-26.doi: 10.7522/j.issn.1000-0240.2018.0505

• 冰冻圈与全球变化 • 上一篇    

基于CryoSat-2雷达高度计数据的南极内陆冰盖高程变化与物质平衡

韩少帅, 柯长青, 夏文韬   

  1. 南京大学 地理与海洋科学学院, 江苏 南京 210023
  • 收稿日期:2018-04-16 修回日期:2018-10-22 发布日期:2019-03-16
  • 作者简介:韩少帅(1993-),男,山东潍坊人,2017年在太原理工大学获学士学位,现为南京大学在读硕士研究生,从事极地高程变化研究.E-mail:hanshaoshuairs@163.com
  • 基金资助:
    国家自然科学基金项目(41371391;41830105);国家重点研发计划项目(2018YFC1407203)资助

Change of surface elevation and mass balance in Antarctic ice sheet based on CryoSat-2 radar altimeter data

HAN Shaoshuai, KE Changqing, XIA Wentao   

  1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China
  • Received:2018-04-16 Revised:2018-10-22 Published:2019-03-16

摘要: 南极冰盖对海平面影响巨大,高程变化测量是南极物质平衡监测的重要手段。采用欧空局CryoSat-2雷达高度计数据,通过提取卫星升降轨的地面交叉点,监测了南极内陆冰盖的高程变化(物质平衡)。结果表明,后向散射能量对Ku波段的CryoSat-2雷达高度计的高程数据具有一定的影响,经后向散射能量校正后,时间序列上的高程变化变得平缓,高程变化与已有的降雪数据相比,更加符合实际情况。2010年11月至2017年11月南极内陆冰盖高程变化趋势为(-1.1±0.2)cm·a-1。西南极的Kamb冰流高程变化率为(38.7±1.1)cm·a-1,Moeller冰流高程变化率为(-10.3±1.2)cm·a-1,部分Thwaites冰川区域高程变化率为(-13.4±1.8)cm·a-1,东南极的Wilkes Land出现高下降区,最高达-20 cm·a-1。Dronning Maud Land虽然出现变化异常的点,但整体并没有显著的高程变化。南极内陆冰盖质量变化为(-10.6±6.2)Gt·a-1,整体上南极内陆冰盖质量变化平缓,部分区域变化较大,Kamb冰流达到(17.9±0.5)Gt·a-1,Moeller冰流达到(-3.4±0.4)Gt·a-1,部分Thwaites冰川区达到(-3.7±0.5)Gt·a-1

关键词: 南极内陆冰盖, CryoSat-2雷达高度计, 高程变化, 物质平衡

Abstract: Antarctic ice sheet is one of the dominate factors in Global sea level rise. Measuring surface elevation changes is one of the important approaches to monitor ice mass balance in Antarctica. Based on the European Space Agency (ESA) CryoSat-2 radar altimeter data, elevation changes of Antarctic inland ice sheet (ice sheet mass balance) is monitored by extracting the ground crossovers between ascending satellite tracks and descending satellite tracks. It was found that the backscattered power influences elevation measurements of Ku-band CryoSat-2 radar altimeter. As this backscatter correction is applied, the elevation changes time series are smoothed, elevation changes compared with available snowfall data, which accords better with practical senses. From November 2010 to November 2017, overall trend of elevation changes in Antarctic inland ice sheet was (-1.1±0.2) cm·a-1. Elevation change rate were (38.7±1.1) cm·a-1 in Kamb ice stream of West Antarctica, (-10.3±1.2) cm·a-1 in Moeller ice stream, and (-13.4±1.8) cm·a-1 in some areas of Thwaites Glacier region, respectively. There was a significant descent area in Wilkes Land of East Antarctica, with a maximum elevation change rate of -20 cm·a-1. In Dronning Maud Land, there was no significant elevation change, except for a few abnormal points. There were no abrupt mass fluctuations across Antarctic inland ice sheet, with an overall change rate of (-10.6±6.2) Gt·a-1. There were a few exceptions in some areas: change rate of mass reached (17.9±0.5) Gt·a-1 in Kamb Ice Stream, (-3.4±0.4) Gt·a-1 in Moeller Ice Stream, and (-3.7±0.5) Gt·a-1 in some areas of Thwaites Glacier, respectively.

Key words: inland ice sheet in Antarctica, CryoSat-2 radar altimeter, elevation change, mass balance

中图分类号: 

  • P343.6