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Conference Paper

Diurnal cycle of precipitation along the Himalayan foothills: Climate simulations vs. reanalyses vs. observations

Authors

Ahrens,  Bodo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Singh,  Prashant
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Ahrens, B., Singh, P. (2023): Diurnal cycle of precipitation along the Himalayan foothills: Climate simulations vs. reanalyses vs. observations, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0151


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016380
Abstract
The interplay of the Indian Monsoon and the Himalayas is vital to many climatological aspects of the Himalayan foothill and foreland regions. A unique climate feature in the Himalayan foothill and foreland regions is a bi-modal diurnal cycle of precipitation with high rainfall amounts in the afternoon and around midnight. The reason for this nighttime precipitation maximum is not yet fully understood, and current climate models and also reanalyses do not represent the regions’ diurnal precipitation cycle. Nevertheless, estimating realistic spatiotemporal precipitation patterns is crucial for the climate community (e.g., for impact modelling). This study reviews discussions in the literature, available observational findings, and simulation results with the regional climate models (RCM) COSMO-CLM & ICON_CLM. Our simulations indicate that the models are not able to recover the nighttime’s precipitation behaviour with currently typical horizontal RCM grid-spacings (e.g., 10 or 50 km), but they can do so with convection-permitting grid-spacing (~3 km), which sufficiently resolves the relevant and diverse orographic thermal winds together with the moist monsoonal flow characteristics in the area.