Greenland ice sheet melt area from MODIS (2000–2014)

Q2 Earth and Planetary Sciences

Geological Survey of Denmark and Greenland Bulletin Pub Date : 2020-03-09 DOI:10.34194/GEUSB.V33.4498

R. Fausto, D. As, Jens A. Antoft, J. Box, W. Colgan, S. Andersen, A. Ahlstrøm, M. L. Andersen, M. Citterio, Charalampos Charalampidis, K. Edelvang, K. Haubner, S. H. Larsen, M. Veicherts, A. Weidick

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引用次数: 3

Abstract

The Greenland ice sheet is an excellent observatory for global climate change. Meltwater from the 1.8 million km2 large ice sheet infl uences oceanic temperature and salinity, nutrient fl uxes and global sea level (IPCC 2013). Surface refl ectivity is a key driver of surface melt rates (Box et al. 2012). Mapping of diff erent ice-sheet surface types provides a clear indicator of where changes in ice-sheet surface refl ectivity are most prominent. Here, we present an updated version of a surface classifi cation algorithm that utilises NASA’s Moderateresolution Imaging Spectroradiometer (MODIS) sensor on the Terra satellite to systematically monitor ice-sheet surface melt (Fausto et al. 2007). Our aim is to determine the areal extent of three surface types over the 2000–2014 period: glacier ice, melting snow (including percolation areas) and dry snow (Cuff ey & Paterson 2010). Monthly 1 km2 resolution surface-type grids can be downloaded via the CryoClim internet portal (www.cryoclim.net). In this report, we briefl y describe the updated classifi cation algorithm, validation of surface types and inter-annual variability in surface types.

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格陵兰冰盖融化面积MODIS数据(2000-2014)

格陵兰冰盖是全球气候变化的绝佳观测站。180万平方公里大冰盖的融水影响海洋温度和盐度、营养物通量和全球海平面(IPCC 2013)。表面反射率是表面融化速率的关键驱动因素(Box et al. 2012)。不同冰盖表面类型的制图提供了一个明确的指标，表明冰盖表面反射率变化最显著的地方。在这里，我们提出了一种更新版本的地表分类算法，该算法利用NASA Terra卫星上的中分辨率成像光谱仪(MODIS)传感器系统地监测冰盖表面融化(Fausto et al. 2007)。我们的目标是确定2000-2014年期间三种地表类型的面积范围:冰川冰、融雪(包括渗透区域)和干雪(Cuff & Paterson 2010)。每月1平方公里分辨率的曲面型网格可通过CryoClim互联网门户网站(www.cryoclim.net)下载。在本报告中，我们简要介绍了更新的分类算法、地表类型的验证和地表类型的年际变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geological Survey of Denmark and Greenland Bulletin GEOLOGY-

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： GEUS Bulletin publishes geoscience research papers, monographs and map descriptions with a focus on Denmark, Greenland and the wider North Atlantic and Arctic region. We welcome submissions that fit this remit. Specifically, we publish: 1.Short articles intended as rapid communications that are of immediate interest to the international geoscience community (these include new research, datasets, methods or reviews) 2.Regular-length articles that document new research or a review of a topic of interest 3.Monographs (single volume works, by arrangement with the editorial office) 4.Maps and descriptive texts (produced by GEUS for Greenland and Denmark, by arrangement with the editorial office) GEUS Bulletin serves a broad geoscientific readership from research, industry, government agencies, NGOs and special interest groups.