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| Titel |
Precipitation and Cloud Statistics in the Deep Tropical Convective Regime |
| VerfasserIn |
Xinyong Shen, Xiaofan Li |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046388
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| Zusammenfassung |
| Precipitation and cloud statistics in the deep tropical convective regime is investigated
through the analysis of grid-scale data from a two-dimensional cloud-resolving model
simulation. The model is forced by large-scale vertical velocity, zonal wind, horizontal
advection, and sea surface temperature observed and derived from the Tropical Ocean Global
Atmosphere Coupled Ocean Atmosphere Response Experiment (TOGA COARE). The
analysis is conducted by categorizing the grid-scale data into eight rainfall types
based on precipitation processes: water vapor convergence, local vapor change and
hydrometeor change/convergence. Among the eight rainfall types, the rainfall with local
atmospheric drying, water vapor divergence and hydrometeor loss/convergence
has the largest contribution (30.8%) to the total rainfall because of large rainfall
coverage (35.3%). The hydrometeor loss is mainly caused by water clouds through
precipitation and the evaporation of rain. For the three other rainfall types with
water vapor divergence, each rainfall type contributes to the total rainfall by less
than 5%. 61% of the total rainfall is attributed to the four rainfall types with water
vapor convergence. Although the rainfall with local atmospheric drying, water vapor
convergence and hydrometeor loss/convergence shows the largest surface rain rate (27.8
mm h-1), it only accounts for a small part (10%) of the total rainfall due to its
small rainfall coverage (1.2%). For the three other rainfall types with water vapor
convergence, each rainfall type contribute to the total rainfall by 14-19%. This
grid-scale precipitation statistics is significantly different from the model domain mean
precipitation statistics, which suggests a spatial-scale dependence of precipitation
statistics.
Keywords: two-dimensional cloud-resolving model; deep tropical convective regime;
TOGA COARE; precipitation and cloud statistics
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This study is supported by the National Key Basic Research and Development Project of
China under Grant No. 2011CB403405, the National Natural Science Foundation of China
under Grant No. 41075039, the Chinese Special Scientific Research Project for Public
Interest under Grant No. GYHY200806009, and the Qinglan Project of Jiangsu Province of
China under Grant No. 2009. |
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