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Simulated single-layer forest canopies delay Northern Hemisphere snowmelt
Responsible organisation
2019 (English)In: The Cryosphere, ISSN 1994-0416, E-ISSN 1994-0424, Vol. 13, no 11, p. 3077-3091Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Copernicus Publications , 2019. Vol. 13, no 11, p. 3077-3091
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:polar:diva-8359DOI: 10.5194/tc-13-3077-2019OAI: oai:DiVA.org:polar-8359DiVA, id: diva2:1395838
Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-02-24Bibliographically approved

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