Impact of lateral boundary errors on the simulation of clouds with a nonhydrostatic regional climate model

Junya Uchida, Masato Mori, Masayuki Hara, Masaki Satoh, Daisuke Goto, Takahito Kataoka, Kentaroh Suzuki, Teruyuki Nakajima

研究成果: ジャーナルへの寄稿学術誌査読

10 被引用数 (Scopus)

抄録

A nonhydrostatic, regional climate limited-area model (LAM) was used to analyze lateral boundary condition (LBC) errors and their influence on the uncertainties of regional models. Simulations using the fully compressible nonhydrostatic LAM (D-NICAM) were compared against the corresponding global quasi-uniform-grid Nonhydrostatic Icosahedral Atmospheric Model (NICAM) and a stretched-grid counterpart (S-NICAM). By this approach of sharing the same dynamical core and physical schemes, possible causes of model bias and LBC errors are isolated. The simulations were performed for a 395-day period from March 2011 through March 2012 with horizontal grid intervals of 14, 28, and 56 km in the region of interest. The resulting temporal mean statistics of the temperatures at 500 hPa were generally well correlated between the global and regional simulations, indicating that LBC errors had a minor impact on the large-scale flows. However, the time-varying statistics of the surface precipitation showed that the LBC errors lead to the unpredictability of convective precipitation, which affected the mean statistics of the precipitation distributions but induced only minor influences on the large-scale systems. Specifically, extratropical cyclones and orographic precipitation are not severely affected. It was concluded that the errors of the precipitation distribution are not due to the difference of the model configurations but rather to the uncertainty of the system itself. This study suggests that applications of ensemble runs, internal nudging, or simulations with longer time scales are needed to obtain more statistically significant results of the precipitation distribution in regional climate models.

本文言語英語
ページ(範囲)5059-5082
ページ数24
ジャーナルMonthly Weather Review
145
12
DOI
出版ステータス出版済み - 12月 1 2017
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 大気科学

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