Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme
<p>We previously reported a notable warm bias in ERA5-Land soil temperature in permafrost regions that was supposedly being caused by an underestimation of 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., HTE...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-07-01
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| Series: | The Cryosphere |
| Online Access: | https://tc.copernicus.org/articles/16/2701/2022/tc-16-2701-2022.pdf |
| _version_ | 1811225239037673472 |
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| author | B. Cao G. Arduini E. Zsoter E. Zsoter |
| author_facet | B. Cao G. Arduini E. Zsoter E. Zsoter |
| author_sort | B. Cao |
| collection | DOAJ |
| description | <p>We previously reported a notable warm bias in ERA5-Land soil temperature in permafrost regions that was supposedly being caused by an underestimation of 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 parameterizations. 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 <span class="inline-formula"><sup>∘</sup>C</span> across the 522 observing stations in high-latitude permafrost regions, and the resulting modeled near-surface permafrost extent was improved (11.0–<span class="inline-formula">12.9×10<sup>6</sup></span> <span class="inline-formula">km<sup>2</sup></span> during 2001–2018), 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.</p> |
| first_indexed | 2024-04-12T09:02:38Z |
| format | Article |
| id | doaj.art-685d7849d8c544059a425aa1bb8fbcff |
| institution | Directory Open Access Journal |
| issn | 1994-0416 1994-0424 |
| language | English |
| last_indexed | 2024-04-12T09:02:38Z |
| publishDate | 2022-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The Cryosphere |
| spelling | doaj.art-685d7849d8c544059a425aa1bb8fbcff2022-12-22T03:39:10ZengCopernicus PublicationsThe Cryosphere1994-04161994-04242022-07-01162701270810.5194/tc-16-2701-2022Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow schemeB. Cao0G. Arduini1E. Zsoter2E. Zsoter3National Tibetan Plateau Data Center (TPDC), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, ChinaEuropean Centre for Medium-Range Weather Forecasts, Reading, UKEuropean Centre for Medium-Range Weather Forecasts, Reading, UKDepartment of Geography and Environmental Science, University of Reading, Reading, UK<p>We previously reported a notable warm bias in ERA5-Land soil temperature in permafrost regions that was supposedly being caused by an underestimation of 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 parameterizations. 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 <span class="inline-formula"><sup>∘</sup>C</span> across the 522 observing stations in high-latitude permafrost regions, and the resulting modeled near-surface permafrost extent was improved (11.0–<span class="inline-formula">12.9×10<sup>6</sup></span> <span class="inline-formula">km<sup>2</sup></span> during 2001–2018), 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.</p>https://tc.copernicus.org/articles/16/2701/2022/tc-16-2701-2022.pdf |
| spellingShingle | B. Cao G. Arduini E. Zsoter E. Zsoter Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme The Cryosphere |
| title | 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_short | 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 |
| url | https://tc.copernicus.org/articles/16/2701/2022/tc-16-2701-2022.pdf |
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