Simulated single-layer forest canopies delay Northern Hemisphere snowmelt
Single-layer vegetation schemes in modern land surface models have been found to overestimate diurnal cycles in longwave radiation beneath forest canopies. This study introduces an empirical correction, based on forest-stand-scale simulations, which reduces diurnal cycles of sub-canopy longwave radi...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00049554 2023-05-15T18:32:33+02:00 Simulated single-layer forest canopies delay Northern Hemisphere snowmelt Todt, Markus Rutter, Nick Fletcher, Christopher G. Wake, Leanne M. 2019-11 electronic https://doi.org/10.5194/tc-13-3077-2019 https://noa.gwlb.de/receive/cop_mods_00049554 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049173/tc-13-3077-2019.pdf https://tc.copernicus.org/articles/13/3077/2019/tc-13-3077-2019.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-3077-2019 https://noa.gwlb.de/receive/cop_mods_00049554 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049173/tc-13-3077-2019.pdf https://tc.copernicus.org/articles/13/3077/2019/tc-13-3077-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/tc-13-3077-2019 2022-02-08T22:37:16Z Single-layer vegetation schemes in modern land surface models have been found to overestimate diurnal cycles in longwave radiation beneath forest canopies. This study introduces an empirical correction, based on forest-stand-scale simulations, which reduces diurnal cycles of sub-canopy longwave radiation. The correction is subsequently implemented in land-only simulations of the Community Land Model version 4.5 (CLM4.5) in order to assess the impact on snow cover. Nighttime underestimations of sub-canopy longwave radiation outweigh daytime overestimations, which leads to underestimated averages over the snow cover season. As a result, snow temperatures are underestimated and snowmelt is delayed in CLM4.5 across evergreen boreal forests. Comparison with global observations confirms this delay and its reduction by correction of sub-canopy longwave radiation. Increasing insolation and day length change the impact of overestimated diurnal cycles on daily average sub-canopy longwave radiation throughout the snowmelt season. Consequently, delay of snowmelt in land-only simulations is more substantial where snowmelt occurs early. Article in Journal/Newspaper The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 13 11 3077 3091 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Todt, Markus Rutter, Nick Fletcher, Christopher G. Wake, Leanne M. Simulated single-layer forest canopies delay Northern Hemisphere snowmelt |
topic_facet |
article Verlagsveröffentlichung |
description |
Single-layer vegetation schemes in modern land surface models have been found to overestimate diurnal cycles in longwave radiation beneath forest canopies. This study introduces an empirical correction, based on forest-stand-scale simulations, which reduces diurnal cycles of sub-canopy longwave radiation. The correction is subsequently implemented in land-only simulations of the Community Land Model version 4.5 (CLM4.5) in order to assess the impact on snow cover. Nighttime underestimations of sub-canopy longwave radiation outweigh daytime overestimations, which leads to underestimated averages over the snow cover season. As a result, snow temperatures are underestimated and snowmelt is delayed in CLM4.5 across evergreen boreal forests. Comparison with global observations confirms this delay and its reduction by correction of sub-canopy longwave radiation. Increasing insolation and day length change the impact of overestimated diurnal cycles on daily average sub-canopy longwave radiation throughout the snowmelt season. Consequently, delay of snowmelt in land-only simulations is more substantial where snowmelt occurs early. |
format |
Article in Journal/Newspaper |
author |
Todt, Markus Rutter, Nick Fletcher, Christopher G. Wake, Leanne M. |
author_facet |
Todt, Markus Rutter, Nick Fletcher, Christopher G. Wake, Leanne M. |
author_sort |
Todt, Markus |
title |
Simulated single-layer forest canopies delay Northern Hemisphere snowmelt |
title_short |
Simulated single-layer forest canopies delay Northern Hemisphere snowmelt |
title_full |
Simulated single-layer forest canopies delay Northern Hemisphere snowmelt |
title_fullStr |
Simulated single-layer forest canopies delay Northern Hemisphere snowmelt |
title_full_unstemmed |
Simulated single-layer forest canopies delay Northern Hemisphere snowmelt |
title_sort |
simulated single-layer forest canopies delay northern hemisphere snowmelt |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-3077-2019 https://noa.gwlb.de/receive/cop_mods_00049554 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049173/tc-13-3077-2019.pdf https://tc.copernicus.org/articles/13/3077/2019/tc-13-3077-2019.pdf |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-3077-2019 https://noa.gwlb.de/receive/cop_mods_00049554 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049173/tc-13-3077-2019.pdf https://tc.copernicus.org/articles/13/3077/2019/tc-13-3077-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-13-3077-2019 |
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The Cryosphere |
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13 |
container_issue |
11 |
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3077 |
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3091 |
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