Assessment of the Greenland ice sheet change (2011–2021) derived from CryoSat-2

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science Pub Date : 2023-06-01 DOI:10.1016/j.polar.2023.100940

Shanwei Liu, Jinghui Jiang, Qinting Sun, Jianhua Wan, Hui Sheng

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引用次数: 1

Abstract

The Greenland ice sheet melting status is critical for global sea level rise and climate change. Based on the CryoSat-2 altimetry data from 2011 to 2021, the 5 km × 5 km DEMs of the Greenland ice sheet were derived by adopting the kriging interpolation method. Then the changes in elevation and volume of the ice sheet were calculated by using the intersection method. The changes in the ice sheet were analysed, and the results show that: (1) The accuracy of the Greenland DEMs obtained based on satellite altimetry data is region-dependent, with better accuracy in inland areas and higher elevation errors in marginal areas. (2) The inland area elevation remains unchanged basically or even shows an increasing trend, and there is an apparent melting trend in the marginal area, especially on the west coast. The contribution of the ice sheet melting mainly comes from elevations below 2000 m. (3) The main body of the Greenland ice sheet is melting with an elevation change rate of −13.27 ± 0.86 cm·a⁻¹ and a volume change rate of −202.47 ± 14.8 km³·a⁻¹. The rate of the Greenland ice sheet thinning has slowed down compared with the changes from 2003 to 2009.

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基于Cryosat-2的格陵兰冰盖变化评估(2011-2021)

格陵兰冰盖的融化对全球海平面上升和气候变化至关重要。基于2011 - 2021年的CryoSat-2卫星测高数据，采用克里格插值方法，得到了格陵兰冰盖5 km × 5 km的dem。然后，采用交点法计算冰盖高程和体积的变化。结果表明:(1)基于卫星高程数据的格陵兰dem精度具有区域依赖性，内陆地区精度较好，边缘地区高程误差较大;②内陆地区高程基本保持不变，甚至呈上升趋势，边缘地区有明显的融化趋势，西海岸尤甚。(3)格陵兰冰盖主体正在融化，高程变化率为−13.27±0.86 cm·a−1，体积变化率为−202.47±14.8 km³·a−1。与2003年至2009年的变化相比，格陵兰冰盖变薄的速度已经放缓。

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来源期刊

Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

3.90

自引率

5.60%

发文量

期刊介绍： Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.