NDLI: China summer precipitation simulations using an optimal ensemble of cumulus schemes

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China summer precipitation simulations using an optimal ensemble of cumulus schemes

Frontiers of Earth Science in China : Volume 3, Issue 1, March 2009

Frontiers of Earth Science in China : Volume 2

Frontiers of Earth Science in China : Volume 1

China summer precipitation simulations using an optimal ensemble of cumulus schemes

Content Provider	Springer Nature Link
Author	Liu, Shuyan Gao, Wei Xu, Min Wang, Xueyuan Liang, Xin Zhong
Copyright Year	2009
Abstract	RegCM3 (REGional Climate Model) simulations of precipitation in China in 1991 and 1998 are very sensitive to the cumulus parameterization. Among the four schemes available, none has superior skills over the whole of China, but each captures certain observed signals in distinct regions. The Grell scheme with the Fritsch-Chappell closure produces the smallest biases over the North; the Grell scheme with the Arakawa-Schubert closure performs the best over the southeast of 100°E; the Anthes-Kuo scheme is superior over the northeast; and the Emanuel scheme is more realistic over the southwest of 100°E and along the Yangtze River Basin. These differences indicate a strong degree of independence and complementarity between the parameterizations. As such, an ensemble is developed from the four schemes, whose relative contributions or weights are optimized locally to yield overall minimum root-mean-square errors from observed daily precipitation. The skill gain is evaluated by applying the identical distribution of the weights in a different period. It is shown that the ensemble always produces gross biases that are smaller than the individual schemes in both 1991 and 1998. The ensemble, however, cannot eliminate the large rainfall deficits over the southwest of 100°E and along the Yangtze River Basin that are systematic across all schemes. Further improve-ments can be made by a super-ensemble based on more cumulus schemes and/or multiple models.
Starting Page	248
Ending Page	257
Page Count	10
File Format	PDF
ISSN	16737385
Journal	Frontiers of Earth Science in China
Volume Number	3
Issue Number	2
e-ISSN	16737490
Language	English
Publisher	SP Higher Education Press
Publisher Date	2009-03-21
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Regional Climate Model cumulus schemes optimal ensemble Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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