Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014
Seasonal snow cover of the Northern Hemisphere (NH) is a major factor in the global climate system, which makes snow cover an important variable in climate models. Previously, substantial uncertainties have been reported in NH snow water equivalent (SWE) estimates. A recent bias-correction method si...
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ftdoajarticles:oai:doaj.org/article:a0b822a065c54c54a2ef112b8e303d8b 2023-05-15T18:32:26+02:00 Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014 K. Kouki P. Räisänen K. Luojus A. Luomaranta A. Riihelä 2022-03-01T00:00:00Z https://doi.org/10.5194/tc-16-1007-2022 https://doaj.org/article/a0b822a065c54c54a2ef112b8e303d8b EN eng Copernicus Publications https://tc.copernicus.org/articles/16/1007/2022/tc-16-1007-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-1007-2022 1994-0416 1994-0424 https://doaj.org/article/a0b822a065c54c54a2ef112b8e303d8b The Cryosphere, Vol 16, Pp 1007-1030 (2022) Environmental sciences GE1-350 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/tc-16-1007-2022 2022-12-31T07:20:37Z Seasonal snow cover of the Northern Hemisphere (NH) is a major factor in the global climate system, which makes snow cover an important variable in climate models. Previously, substantial uncertainties have been reported in NH snow water equivalent (SWE) estimates. A recent bias-correction method significantly reduces the uncertainty of NH SWE estimation, which enables a more reliable analysis of the climate models' ability to describe the snow cover. We have intercompared NH SWE estimates between CMIP6 (Coupled Model Intercomparison Project Phase 6) models and observation-based SWE reference data north of 40 ∘ N for the period 1982–2014 and analyzed with a regression approach whether model biases in temperature ( T ) and precipitation ( P ) could explain the model biases in SWE. We analyzed separately SWE in winter and SWE change rate in spring. For SWE reference data, we used bias-corrected SnowCCI data for non-mountainous regions and the mean of Brown, MERRA-2 and Crocus v7 data for the mountainous regions. The SnowCCI SWE data are based on satellite passive microwave radiometer data and in situ snow depth data. The analysis shows that CMIP6 models tend to overestimate SWE; however, large variability exists between models. In winter, P is the dominant factor causing SWE discrepancies especially in the northern and coastal regions. T contributes to SWE biases mainly in regions, where T is close to 0 ∘ C in winter. In spring, the importance of T in explaining the snowmelt rate discrepancies increases. This is to be expected, because the increase in T is the main factor that causes snow to melt as spring progresses. Furthermore, it is obvious from the results that biases in T or P cannot explain all model biases either in SWE in winter or in the snowmelt rate in spring. Other factors, such as deficiencies in model parameterizations and possibly biases in the observational datasets, also contribute to SWE discrepancies. In particular, linear regression suggests that when the biases in T and P are eliminated, the ... Article in Journal/Newspaper The Cryosphere Directory of Open Access Journals: DOAJ Articles Merra ENVELOPE(12.615,12.615,65.816,65.816) The Cryosphere 16 3 1007 1030 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
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Environmental sciences GE1-350 Geology QE1-996.5 K. Kouki P. Räisänen K. Luojus A. Luomaranta A. Riihelä Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014 |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Seasonal snow cover of the Northern Hemisphere (NH) is a major factor in the global climate system, which makes snow cover an important variable in climate models. Previously, substantial uncertainties have been reported in NH snow water equivalent (SWE) estimates. A recent bias-correction method significantly reduces the uncertainty of NH SWE estimation, which enables a more reliable analysis of the climate models' ability to describe the snow cover. We have intercompared NH SWE estimates between CMIP6 (Coupled Model Intercomparison Project Phase 6) models and observation-based SWE reference data north of 40 ∘ N for the period 1982–2014 and analyzed with a regression approach whether model biases in temperature ( T ) and precipitation ( P ) could explain the model biases in SWE. We analyzed separately SWE in winter and SWE change rate in spring. For SWE reference data, we used bias-corrected SnowCCI data for non-mountainous regions and the mean of Brown, MERRA-2 and Crocus v7 data for the mountainous regions. The SnowCCI SWE data are based on satellite passive microwave radiometer data and in situ snow depth data. The analysis shows that CMIP6 models tend to overestimate SWE; however, large variability exists between models. In winter, P is the dominant factor causing SWE discrepancies especially in the northern and coastal regions. T contributes to SWE biases mainly in regions, where T is close to 0 ∘ C in winter. In spring, the importance of T in explaining the snowmelt rate discrepancies increases. This is to be expected, because the increase in T is the main factor that causes snow to melt as spring progresses. Furthermore, it is obvious from the results that biases in T or P cannot explain all model biases either in SWE in winter or in the snowmelt rate in spring. Other factors, such as deficiencies in model parameterizations and possibly biases in the observational datasets, also contribute to SWE discrepancies. In particular, linear regression suggests that when the biases in T and P are eliminated, the ... |
format |
Article in Journal/Newspaper |
author |
K. Kouki P. Räisänen K. Luojus A. Luomaranta A. Riihelä |
author_facet |
K. Kouki P. Räisänen K. Luojus A. Luomaranta A. Riihelä |
author_sort |
K. Kouki |
title |
Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014 |
title_short |
Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014 |
title_full |
Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014 |
title_fullStr |
Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014 |
title_full_unstemmed |
Evaluation of Northern Hemisphere snow water equivalent in CMIP6 models during 1982–2014 |
title_sort |
evaluation of northern hemisphere snow water equivalent in cmip6 models during 1982–2014 |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-1007-2022 https://doaj.org/article/a0b822a065c54c54a2ef112b8e303d8b |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Merra |
geographic_facet |
Merra |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 1007-1030 (2022) |
op_relation |
https://tc.copernicus.org/articles/16/1007/2022/tc-16-1007-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-1007-2022 1994-0416 1994-0424 https://doaj.org/article/a0b822a065c54c54a2ef112b8e303d8b |
op_doi |
https://doi.org/10.5194/tc-16-1007-2022 |
container_title |
The Cryosphere |
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16 |
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3 |
container_start_page |
1007 |
op_container_end_page |
1030 |
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