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DOI | 10.1007/s00382-016-3413-z |
Mechanisms of improved rainfall simulation over the Maritime Continent due to increased horizontal resolution in an AGCM | |
Rashid, Harun A.; Hirst, Anthony C. | |
2017-09-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | The General Circulation Models experience a significant challenge in realistically simulating rainfall over the tropical Maritime Continent (hereafter, MC). Here, we investigate the mechanisms of an improvement in monthly rainfall simulation over the MC region in the UK Met Office Unified Model (version Global Atmosphere 6.0), which occurs when the horizontal resolution is increased from N96 (grid spacing similar to 135 km) to N216 (similar to 60 km). The increased resolution enhances the area-averaged rainfall rate over the MC, thereby reducing the dry rainfall bias seen in the model at the N96 resolution. We find that the enhanced area-averaged rainfall is mostly due to an increase in the medium rainfall rates that occurs over the MC islands in the N216 experiment. The rainfall change is predominantly associated with changes in the atmospheric convective circulation and the related horizontal moisture flux convergence. The vertical profiles of convective circulation show a strong sensitivity to the increased horizontal resolution over the MC islands, but not over the surrounding oceans. It is shown that a significant underestimation of the deep convection (as opposed to the shallow convection) in the N96 experiment is primarily responsible for the stronger dry bias in this experiment. We present evidence that the dry bias, and the associated weaker deep convection, are in part caused by the strongly smoothed orography used in the N96 experiment, which provides a weaker orographic lifting of the moist surface air (in a conditionally unstable atmosphere) than that in the N216 experiment. |
英文关键词 | Rainfall bias Maritime Continent GCMs Tropical convection Orographic lifting |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000408718200015 |
WOS关键词 | OFFICE UNIFIED MODEL ; CLIMATE MODEL ; TROPICAL CIRCULATION ; GLOBAL PRECIPITATION ; SCHEME DESCRIPTION ; LAND ; CONFIGURATIONS ; REPRESENTATION ; SENSITIVITY ; SYSTEM |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35708 |
专题 | 气候变化 |
作者单位 | CSIRO Oceans & Atmosphere, 107-121 Stn St, Melbourne, Vic 3195, Australia |
推荐引用方式 GB/T 7714 | Rashid, Harun A.,Hirst, Anthony C.. Mechanisms of improved rainfall simulation over the Maritime Continent due to increased horizontal resolution in an AGCM[J]. CLIMATE DYNAMICS,2017,49. |
APA | Rashid, Harun A.,&Hirst, Anthony C..(2017).Mechanisms of improved rainfall simulation over the Maritime Continent due to increased horizontal resolution in an AGCM.CLIMATE DYNAMICS,49. |
MLA | Rashid, Harun A.,et al."Mechanisms of improved rainfall simulation over the Maritime Continent due to increased horizontal resolution in an AGCM".CLIMATE DYNAMICS 49(2017). |
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