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The effects of the modified mosaic approach method on regional simulations of surface meteorological variables in western China
Author(s) -
Chen Guangyu,
Wei Zhigang,
Jin Xiaoai,
Dong Wenjie,
Zhu Xian,
Liu Yajing,
Zheng Zhiyuan,
Liu Yujia
Publication year - 2020
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.6440
Subject(s) - weather research and forecasting model , climatology , environmental science , forcing (mathematics) , wind speed , relative humidity , plateau (mathematics) , atmospheric sciences , meteorology , range (aeronautics) , geography , geology , mathematics , materials science , mathematical analysis , composite material
In this article, a modified mosaic approach method (MMAM), which considers the subgrid‐scale effect of topographical height on atmospheric forcing, is introduced. Two experiments are designed to study the effects of MMAM on surface meteorological variables in Western China within the weather research and forecasting (WRF) modelling framework during June to August 2010. Results show that MMAM has obvious effects on surface 2 m temperature improvement. Simulations of the surface 2 m temperature with MMAM are closer to the observed values over a wide range of areas, particularly around the Qinghai‐Tibet Plateau and the Tianshan Mountains. However, MMAM does not show obvious improvements on 2 m relative humidity and on 10 m wind velocity. By investigations of two selected grid cells, we find that MMAM always shows a consistent deviation (positive or negative) on 2 m temperatures compared with the control experiment throughout the study period, which is related to the fact that the difference in topographical height within the model grid does not vary with time; the differences of surface energy illustrate that MMAM directly affects the upward longwave radiation due to a revision of the forcing temperature, resulting in a redistribution of surface energy.