Sensitivity of simulated summer monsoonal precipitation in Langtang Valley, Himalaya, to cloud microphysics schemes in WRF

Journal article


Publication Details

Author(s): Orr A, Listowski C, Couttet M, Collier S, Immerzeel W, Deb P, Bannister D
Journal: Journal of Geophysical Research: Atmospheres
Publisher: AMER GEOPHYSICAL UNION
Publication year: 2017
Volume: 122
Journal issue: 12
Pages range: 6298-6318
ISSN: 2169-897X
Language: English


Abstract


A better understanding of regional-scale precipitation patterns in the Himalayan region is required to increase our knowledge of the impacts of climate change on downstream water availability. This study examines the impact of four cloud microphysical schemes (Thompson, Morrison, Weather Research and Forecasting (WRF) single-moment 5-class, and WRF double-moment 6-class) on summer monsoon precipitation in the Langtang Valley in the central Nepalese Himalayas, as simulated by the WRF model at 1 km grid spacing for a 10 day period in July 2012. The model results are evaluated through a comparison with surface precipitation and radiation measurements made at two observation sites. Additional understanding is gained from a detailed examination of the microphysical characteristics simulated by each scheme, which are compared with measurements using a spaceborne radar/lidar cloud product. Also examined are the roles of large- and small-scale forcings. In general, the schemes are able to capture the timing of surface precipitation better than the actual amounts in the Langtang Valley, which are predominately underestimated, with the Morrison scheme showing the best agreement with the measured values. The schemes all show a large positive bias in incoming radiation. Analysis of the radar/lidar cloud product and hydrometeors from each of the schemes suggests that "cold-rain" processes are a key precipitation formation mechanism, which is also well represented by the Morrison scheme. As well as microphysical structure, both large-scale and localized forcings are also important for determining surface precipitation.



FAU Authors / FAU Editors

Collier, Sarah, Ph.D.
Institut für Geographie


External institutions with authors

British Antarctic Survey
Universiteit Utrecht (UU) / Utrecht University


How to cite

APA:
Orr, A., Listowski, C., Couttet, M., Collier, S., Immerzeel, W., Deb, P., & Bannister, D. (2017). Sensitivity of simulated summer monsoonal precipitation in Langtang Valley, Himalaya, to cloud microphysics schemes in WRF. Journal of Geophysical Research: Atmospheres, 122(12), 6298-6318. https://dx.doi.org/10.1002/2016JD025801

MLA:
Orr, Andrew, et al. "Sensitivity of simulated summer monsoonal precipitation in Langtang Valley, Himalaya, to cloud microphysics schemes in WRF." Journal of Geophysical Research: Atmospheres 122.12 (2017): 6298-6318.

BibTeX: 

Last updated on 2018-12-07 at 11:23