气候变化领域集成服务门户(CCPortal): Development and testing of a subgrid glacier mass balance model for nesting in the Canadian Regional Climate Model

CCPortal

DOI	10.1007/s00382-019-04676-6
	Development and testing of a subgrid glacier mass balance model for nesting in the Canadian Regional Climate Model
	Perroud M.; Fasel M.; Marshall S.J.
发表日期	2019
ISSN	0930-7575
起始页码	1453
结束页码	1476
卷号	53 期号:2020-03-04
英文摘要	The aim of this study is to develop and test a methodology to explicitly resolve glacier energy and mass balance in regional climate models (RCMs). There is increasing interest in the ability to represent mountain glaciers in climate models, to enable either one-way forced or fully-coupled simulations of glacier response to climate change. However, mountain glaciers are generally subgrid features (areas of less than 10 km2) occupying high elevations in complex mountain terrain, and it is important to examine whether RCM-derived meteorological fields in mountain regions are accurate enough to model glacier mass balance. We use downscaled RCM data to force a glacier model at five different sites in western North America, where long-term glacier mass balance observations allow us to evaluate different glacier modelling and climate downscaling strategies. The model runs on a pre-processed, gridded database of 100-m resolution topographic characteristics. Our reference glacier simulations use this high resolution grid to explicitly simulate glacier surface and energy balance, but this is computationally demanding. We test different mosaic approaches for subgrid characterization of the glaciers, where glaciers in an RCM grid cell are distributed over different terrain classes, similar to hydrological response units. The subgrid mosaic approach drastically increases computational efficiency without affecting mass balance simulations for the five glaciers by more than a few percent. Elevation distribution within a grid cell is the most important element of the subgrid terrain characterization; subgrid elevation bands need to be resolved to 200 m or less in order to keep seasonal mass balance biases lower than 2%. Good simulations of glacier mass balance can be achieved with glacier-specific tuning, with correlation coefficients of ~ 0.8 between modelled and measured annual glacier mass balances over the period 1995–2014. However, there are large and regionally-variable biases in the modelled meteorological fields, and we cannot achieve good results without local bias correction. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Glacier mass balance model; Mosaic approach; RCM; Subgrid modelling
语种	英语
scopus关键词	climate change; climate modeling; computer simulation; glacier mass balance; glaciology; mountain region; regional climate; Canada
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146142
作者单位	Department of Geography, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada; Institute for Environmental Sciences, University of Geneva, Bd. Carl-Vogt 66, Geneva, 1205, Switzerland
推荐引用方式 GB/T 7714	Perroud M.,Fasel M.,Marshall S.J.. Development and testing of a subgrid glacier mass balance model for nesting in the Canadian Regional Climate Model[J],2019,53(2020-03-04).
APA	Perroud M.,Fasel M.,&Marshall S.J..(2019).Development and testing of a subgrid glacier mass balance model for nesting in the Canadian Regional Climate Model.Climate Dynamics,53(2020-03-04).
MLA	Perroud M.,et al."Development and testing of a subgrid glacier mass balance model for nesting in the Canadian Regional Climate Model".Climate Dynamics 53.2020-03-04(2019).