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DOI10.5194/gmd-12-3759-2019
Snowfall distribution and its response to the Arctic Oscillation: an evaluation of HighResMIP models in the Arctic using CPR/CloudSat observations
Thomas, Manu Anna1; Devasthale, Abhay1; L'; Ecuyer, Tristan2; Wang, Shiyu1; Koenigk, Torben1,3; Wyser, Klaus1
发表日期2019
ISSN1991-959X
EISSN1991-9603
卷号12期号:8页码:3759-3772
英文摘要

A realistic representation of snowfall in general circulation models (GCMs) of global climate is important to accurately simulate snow cover, surface albedo, high-latitude precipitation and thus the surface radiation budget. Hence, in this study, we evaluate snowfall in a range of climate models run at two different resolutions by comparing to the latest estimates of snowfall from the CloudSat Cloud Profiling Radar over the northern latitudes. We also evaluate whether the finer-resolution versions of the GCMs simulate the accumulated snowfall better than their coarse-resolution counterparts. As the Arctic Oscillation (AO) is the prominent mode of natural variability in the polar latitudes, the snowfall variability associated with the different phases of the AO is examined in both models and in our observational reference. We report that the statistical distributions of snowfall differ considerably between the models and CloudSat observations. While CloudSat shows an exponential distribution of snowfall, the models show a Gaussian distribution that is heavily positively skewed. As a result, the 10th and 50th percentiles, representing the light and median snowfall, are overestimated by up to factors of 3 and 1.5, respectively, in the models investigated here. The overestimations are strongest during the winter months compared to autumn and spring. The extreme snowfall represented by the 90th percentiles, on the other hand, is positively skewed, underestimating the snowfall estimates by up to a factor of 2 in the models in winter compared to the CloudSat estimates. Though some regional improvements can be seen with increased spatial resolution within a particular model, it is not easy to identify a specific pattern that holds across all models. The characteristic snow- fall variability associated with the positive phase of AO over Greenland Sea and central Eurasian Arctic is well captured by the models.


WOS研究方向Geology
来源期刊GEOSCIENTIFIC MODEL DEVELOPMENT
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/102107
作者单位1.Swedish Meteorol & Hydrol Inst, Folkborgsvagen 17, S-60176 Norrkoping, Sweden;
2.Univ Wisconsin, 1225 West Dayton St, Madison, WI 53706 USA;
3.Stockholm Univ, Bolin Ctr Climate Res, S-10691 Stockholm, Sweden
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GB/T 7714
Thomas, Manu Anna,Devasthale, Abhay,L',et al. Snowfall distribution and its response to the Arctic Oscillation: an evaluation of HighResMIP models in the Arctic using CPR/CloudSat observations[J],2019,12(8):3759-3772.
APA Thomas, Manu Anna.,Devasthale, Abhay.,L'.,Ecuyer, Tristan.,Wang, Shiyu.,...&Wyser, Klaus.(2019).Snowfall distribution and its response to the Arctic Oscillation: an evaluation of HighResMIP models in the Arctic using CPR/CloudSat observations.GEOSCIENTIFIC MODEL DEVELOPMENT,12(8),3759-3772.
MLA Thomas, Manu Anna,et al."Snowfall distribution and its response to the Arctic Oscillation: an evaluation of HighResMIP models in the Arctic using CPR/CloudSat observations".GEOSCIENTIFIC MODEL DEVELOPMENT 12.8(2019):3759-3772.
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