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| Titel |
Observation- and numerical-analysis-based dynamics of the Uttarkashi cloudburst |
| VerfasserIn |
C. Chaudhuri, S. Tripathi, R. Srivastava, A. Misra |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 33, no. 6 ; Nr. 33, no. 6 (2015-06-03), S.671-686 |
| Datensatznummer |
250121205
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| Publikation (Nr.) |
 copernicus.org/angeo-33-671-2015.pdf |
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| Zusammenfassung |
| A Himalayan cloudburst event, which occurred on 3 August 2012 in the
Uttarkashi (30.73° N, 78.45° E) region of Uttarakhand,
India, was analyzed. The near-surface atmospheric variables were analyzed to
study the formation, evolution, and triggering mechanisms of this cloudburst.
In order to improve upon the understanding provided by the observations,
numerical simulations were performed using the Weather Research and
Forecasting (WRF) model, configured with a single domain at 18 km
resolution. The model was tuned using variation of different
parameterizations (convective, microphysical, boundary layer, radiation, and
land surface), and different model options (number of vertical levels, and
spin-up time), which resulted in a combination of parameters and options that
best reproduced the observed diurnal characteristics of the near-surface
atmospheric variables. Our study demonstrates the ability of WRF in
forecasting precipitation, and resolving synoptic-scale and mesoscale
interactions. In order to better understand the cloudburst, we configured WRF
with multiply nested two-way-interacting domains (18, 6, 2 km) centered on
the location of interest, and simulated the event with the best configuration
derived earlier. The results indicate that two mesoscale convective systems
originating from Madhya Pradesh and Tibet interacted over Uttarkashi and,
under orographic uplifting and in the presence of favorable moisture condition,
resulted in this cloudburst event. |
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