The ERA5-Land soil temperature bias in permafrost regions

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 Ca...

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Published in:The cryosphere 2020-08, Vol.14 (8), p.2581-2595
Main Authors: Cao, Bin, Gruber, Stephan, Zheng, Donghai, Li, Xin
Format: Article
Language:English
Subjects:
Air temperature
Bias
Computer simulation
Decision making
Heat conductivity
Hydrology
Ice
Land surface models
Parameterization
Permafrost
Regions
Simulation
Snow
Snow density
Soil
Soil temperature
Soils
Temperature
Temperature requirements
Thickness
Time series
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cited_by cdi_FETCH-LOGICAL-a500t-d82b293b6a3c4dc7a7a9e6c91ca6ef7316df0bd3129b90b94701a6dee1b90dd83
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Gruber, Stephan
Zheng, Donghai
Li, Xin
description 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 ∘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 (
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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.</abstract><cop>Katlenburg-Lindau</cop><pub>Copernicus GmbH</pub><doi>10.5194/tc-14-2581-2020</doi><tpages>15</tpages><orcidid>https://orcid.org/0000-0003-2473-2276</orcidid><orcidid>https://orcid.org/0000-0003-1151-3381</orcidid><orcidid>https://orcid.org/0000-0002-1079-1542</orcidid><oa>free_for_read</oa></addata></record>
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subjects Air temperature
Bias
Computer simulation
Decision making
Heat conductivity
Hydrology
Ice
Land surface models
Parameterization
Permafrost
Regions
Simulation
Snow
Snow density
Soil
Soil temperature
Soils
Temperature
Temperature requirements
Thickness
Time series
title The ERA5-Land soil temperature bias in permafrost regions
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