气候变化领域集成服务门户(CCPortal): The ERA5-Land soil temperature bias in permafrost regions

CCPortal

DOI	10.5194/tc-14-2581-2020
	The ERA5-Land soil temperature bias in permafrost regions
	Cao, Bin; Gruber, Stephan; Zheng, Donghai; Li, Xin
通讯作者	Zheng, DH ; Li, X (通讯作者)
发表日期	2020
ISSN	1994-0416
EISSN	1994-0424
起始页码	2581
结束页码	2595
卷号	14 期号:8
英文摘要	ERA5-Land (ERA5L) is a reanalysis product derived by running the land component of ERA5 at increased resolution. This study evaluates ERA5L soil temperature in permafrost regions based on observations and published permafrost products. We find that ERA5L overestimates soil temperature in northern Canada and Alaska but underestimates it in mid-low latitudes, leading to an average bias of - 0.08 degrees C. The warm bias of ERA5L soil is stronger in winter than in other seasons. As calculated from its soil temperature, ERA5L overestimates active-layer thickness and underestimates near-surface (< 1.89 m) permafrost area. This is thought to be due in part to the shallow soil column and coarse vertical discretization of the land surface model and to warmer simulated soil. The soil temperature bias in permafrost regions correlates well with the bias in air temperature and with maximum snow height. A review of the ERA5L snow parameterization and a simulation example both point to a low bias in ERA5L snow density as a possible cause for the warm bias in soil temperature. The apparent disagreement of station-based and areal evaluation techniques highlights challenges in our ability to test permafrost simulation models. While global reanalyses are important drivers for permafrost simulation, we conclude that ERA5L soil data are not well suited for informing permafrost research and decision making directly. To address this, future soil temperature products in reanalyses will require permafrost-specific alterations to their land surface models.
关键词	LAND-SURFACE MODEL ACTIVE LAYER THICKNESS NORTHERN-HEMISPHERE TIBETAN PLATEAU METEOROLOGICAL CONDITIONS THERMAL REGIME CLIMATE-CHANGE RESEARCH SITE SNOW COVER SIMULATIONS
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000562141300002
来源期刊	CRYOSPHERE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259713
推荐引用方式 GB/T 7714	Cao, Bin,Gruber, Stephan,Zheng, Donghai,et al. The ERA5-Land soil temperature bias in permafrost regions[J]. 中国科学院青藏高原研究所,2020,14(8).
APA	Cao, Bin,Gruber, Stephan,Zheng, Donghai,&Li, Xin.(2020).The ERA5-Land soil temperature bias in permafrost regions.CRYOSPHERE,14(8).
MLA	Cao, Bin,et al."The ERA5-Land soil temperature bias in permafrost regions".CRYOSPHERE 14.8(2020).