Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme
We previously reported a notable warm bias in ERA5-Land soil temperature in permafrost regions that was supposedly being caused by an underestimation of the snow density. In this study, we implemented and evaluated a new multi-layer snow scheme in the land surface scheme of ERA5-Land, i.e., HTESSEL,...
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ftcopernicus:oai:publications.copernicus.org:tcd102102 2023-05-15T17:55:24+02:00 Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme Cao, Bin Arduini, Gabriele Zsoter, Ervin 2022-04-12 application/pdf https://doi.org/10.5194/tc-2022-71 https://tc.copernicus.org/preprints/tc-2022-71/ eng eng doi:10.5194/tc-2022-71 https://tc.copernicus.org/preprints/tc-2022-71/ eISSN: 1994-0424 Text 2022 ftcopernicus https://doi.org/10.5194/tc-2022-71 2022-04-18T16:21:49Z We previously reported a notable warm bias in ERA5-Land soil temperature in permafrost regions that was supposedly being caused by an underestimation of the snow density. In this study, we implemented and evaluated a new multi-layer snow scheme in the land surface scheme of ERA5-Land, i.e., HTESSEL, with revised snow densification parametrizations. We compared permafrost soil temperatures from the numerical experiments with observations and the original ERA5-Land with a single layer snow scheme. The revised HTESSEL significantly improved the representation of soil temperature in permafrost regions compared to ERA5-Land. The daily warm bias in winter was reduced by about 0.6–3.0 °C, and the resulting modelled near-surface permafrost extent was improved (11.0–12.9 × 10 6 km 2 ), comparing reasonably with observed estimates for continuous and discontinuous permafrost areas. We therefore suggest that a better-resolved snow scheme with a multi-layer snow profile should be included in next-generation reanalyses as a first step towards improving the representation of permafrost. Text permafrost Copernicus Publications: E-Journals |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We previously reported a notable warm bias in ERA5-Land soil temperature in permafrost regions that was supposedly being caused by an underestimation of the snow density. In this study, we implemented and evaluated a new multi-layer snow scheme in the land surface scheme of ERA5-Land, i.e., HTESSEL, with revised snow densification parametrizations. We compared permafrost soil temperatures from the numerical experiments with observations and the original ERA5-Land with a single layer snow scheme. The revised HTESSEL significantly improved the representation of soil temperature in permafrost regions compared to ERA5-Land. The daily warm bias in winter was reduced by about 0.6–3.0 °C, and the resulting modelled near-surface permafrost extent was improved (11.0–12.9 × 10 6 km 2 ), comparing reasonably with observed estimates for continuous and discontinuous permafrost areas. We therefore suggest that a better-resolved snow scheme with a multi-layer snow profile should be included in next-generation reanalyses as a first step towards improving the representation of permafrost. |
format |
Text |
author |
Cao, Bin Arduini, Gabriele Zsoter, Ervin |
spellingShingle |
Cao, Bin Arduini, Gabriele Zsoter, Ervin Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme |
author_facet |
Cao, Bin Arduini, Gabriele Zsoter, Ervin |
author_sort |
Cao, Bin |
title |
Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme |
title_short |
Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme |
title_full |
Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme |
title_fullStr |
Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme |
title_full_unstemmed |
Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme |
title_sort |
brief communication: improving era5-land soil temperature in permafrost regions using an optimized multi-layer snow scheme |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-2022-71 https://tc.copernicus.org/preprints/tc-2022-71/ |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2022-71 https://tc.copernicus.org/preprints/tc-2022-71/ |
op_doi |
https://doi.org/10.5194/tc-2022-71 |
_version_ |
1766163335417430016 |