气候变化领域集成服务门户(CCPortal): Deriving Arctic 2m air temperatures over snow and ice from satellite surface temperature measurements

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DOI	10.5194/tc-15-3035-2021
	Deriving Arctic 2m air temperatures over snow and ice from satellite surface temperature measurements
	Nielsen-Englyst P.; Høyer J.L.; Madsen K.S.; Tonboe R.T.; Dybkjær G.; Skarpalezos S.
发表日期	2021
ISSN	19940416
起始页码	3035
结束页码	3057
卷号	15 期号:7
英文摘要	The Arctic region is responding heavily to climate change, and yet, the air temperature of ice-covered areas in the Arctic is heavily under-sampled when it comes to in situ measurements, resulting in large uncertainties in existing weather and reanalysis products. This paper presents a method for estimating daily mean clear-sky 2m air temperatures (T2m) in the Arctic from satellite observations of skin temperature, using the Arctic and Antarctic ice Surface Temperatures from thermal Infrared (AASTI) satellite dataset, providing spatially detailed observations of the Arctic. The method is based on a linear regression model, which has been tuned against in situ observations to estimate daily mean T2m based on clear-sky satellite ice surface skin temperatures. The daily satellite-derived T2m product includes estimated uncertainties and covers the Arctic sea ice and the Greenland Ice Sheet during clear skies for the period 2000-2009, provided on a 0.25 regular latitude-longitude grid. Comparisons with independent in situ measured T2m show average biases of 0.30 and 0.35C and average root-mean-square errors of 3.47 and 3.20C for land ice and sea ice, respectively. The associated uncertainties are verified to be very realistic for both land ice and sea ice, using in situ observations. The reconstruction provides a much better spatial coverage than the sparse in situ observations of T2m in the Arctic and is independent of numerical weather prediction model input. Therefore, it provides an important supplement to simulated air temperatures to be used for assimilation or global surface temperature reconstructions. A comparison of T2m derived from satellite and ERA-Interim/ERA5 estimates shows that the satellite-derived T2m validates similar to or better than ERA-Interim/ERA5 against in situ measurements in the Arctic. © Authors 2021
英文关键词	air temperature; ice core; ice cover; measurement method; satellite data; snow cover; surface temperature; Arctic; Arctic Ocean
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202394
作者单位	DTU-Space, Technical University of Denmark, Kongens Lyngby, 2800, Denmark; Research and Development, Danish Meteorological Institute (DMI), Copenhagen Ø, 2100, Denmark
推荐引用方式 GB/T 7714	Nielsen-Englyst P.,Høyer J.L.,Madsen K.S.,et al. Deriving Arctic 2m air temperatures over snow and ice from satellite surface temperature measurements[J],2021,15(7).
APA	Nielsen-Englyst P.,Høyer J.L.,Madsen K.S.,Tonboe R.T.,Dybkjær G.,&Skarpalezos S..(2021).Deriving Arctic 2m air temperatures over snow and ice from satellite surface temperature measurements.Cryosphere,15(7).
MLA	Nielsen-Englyst P.,et al."Deriving Arctic 2m air temperatures over snow and ice from satellite surface temperature measurements".Cryosphere 15.7(2021).