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DOI | 10.1002/2017GL074440 |
The neglected Indo-Gangetic Plains low-level jet and its importance for moisture transport and precipitation during the peak summer monsoon | |
Acosta, R. P.1; Huber, M.1,2 | |
2017-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Accurately simulating the Indo-Asian monsoon (IAM) using atmospheric general circulation models (AGCMs) is challenging but crucial. This study uses reanalysis products European Centre of Medium-Range Forecast Interim reanalysis, Japanese Reanalysis year 55, and High Asia Reanalysis to highlight an easterly, low-level barrier jet along the Indo-Gangetic Plain (referred from here as IG LLJ), which we identify as the primary moisture transport mechanism for the northeastern branch of the IAM. We show that the NCAR family of AGCMs (Community Atmospheric Model (CAM)) does not capture this circulation until 1/2 degrees or greater spatial horizontal resolution is used. The IG LLJ develops due to a persistent low-pressure system centered over the Ganges basin and is enhanced by the Himalayas. Using diabatic heating rates and the moist Froude number as diagnostics, we find that in CAM, this branch of the IAM displays two different dynamical regimes as a function of resolution. At low resolution, the atmosphere near the Himalayas is statically unstable, diabatic heating is strong, and the moisture flow is southwesterly from the Arabian Sea and moves over the terrain (unblocked). At high resolution, the moist static stability near the Himalayan Mountains is stable, diabatic heating is weak, and the flow primarily enters easterly from the Bay of Bengal and moves parallel to the terrain (blocked). During the summer season, the low-resolution CAM is locked into the unblocked mode, which has serious implications for interpreting topography-monsoon interactions. For a broader context, we demonstrate that more than half of the CMIP5 models do not capture the IG LLJ, which further highlights model-data mismatch across the IAM region. |
英文关键词 | Indo-Asian Monsoon Indo-Gangetic Plains Low-Level Jet Moist Froude number Reanalysis Products CMIP5 Models |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410658800059 |
WOS关键词 | TIBETAN PLATEAU ; CLIMATE-CHANGE ; TRANSITIONS ; CONVECTION ; PREDICTION ; CALIFORNIA ; DYNAMICS ; CLOUDS ; SYSTEM ; RANGE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/26793 |
专题 | 气候变化 |
作者单位 | 1.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA; 2.Univ New Hampshire, Inst Study Earth Ocean & Space, Durham, NH 03824 USA |
推荐引用方式 GB/T 7714 | Acosta, R. P.,Huber, M.. The neglected Indo-Gangetic Plains low-level jet and its importance for moisture transport and precipitation during the peak summer monsoon[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(16). |
APA | Acosta, R. P.,&Huber, M..(2017).The neglected Indo-Gangetic Plains low-level jet and its importance for moisture transport and precipitation during the peak summer monsoon.GEOPHYSICAL RESEARCH LETTERS,44(16). |
MLA | Acosta, R. P.,et al."The neglected Indo-Gangetic Plains low-level jet and its importance for moisture transport and precipitation during the peak summer monsoon".GEOPHYSICAL RESEARCH LETTERS 44.16(2017). |
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