 |
| Titel |
Updated cloud physics in a regional atmospheric climate model improves the modelled surface energy balance of Antarctica |
| VerfasserIn |
J. M. van Wessem, C. H. Reijmer, J. T. M. Lenaerts, W. J. van de Berg, M. R. van den Broeke, E. van Meijgaard |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 1 ; Nr. 8, no. 1 (2014-01-22), S.125-135 |
| Datensatznummer |
250116011
|
| Publikation (Nr.) |
 copernicus.org/tc-8-125-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this study the effects of changes in the physics package of the regional
atmospheric climate model RACMO2 on the modelled surface energy balance,
near-surface temperature and wind speed of Antarctica are presented. The
physics package update primarily consists of an improved turbulent and
radiative flux scheme and a revised cloud scheme that includes a
parameterisation for ice cloud super-saturation. The ice cloud
super-saturation has led to more moisture being transported onto the
continent, resulting in more and optically thicker clouds and more downward
long-wave radiation. Overall, the updated model better represents the surface
energy balance, based on a comparison with >750 months of data from nine
automatic weather stations located in East Antarctica. Especially the
representation of the turbulent sensible heat flux and net long-wave radiative
flux has improved with a decrease in biases of up to 40%. As a result,
modelled surface temperatures have increased and the bias, when compared to
10 m snow temperatures from 64 ice-core observations, has decreased from
−2.3 K to −1.3 K. The weaker surface temperature inversion consequently
improves the representation of the sensible heat flux, whereas wind speed
biases remain unchanged. However, significant model biases remain, partly
because RACMO2 at a resolution of 27 km is unable to resolve steep
topography. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|