Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD028999 |
Role of Troposphere-Convection-Land Coupling in the Southwestern Amazon Precipitation Bias of the Community Earth System Model Version 1 (CESM1) | |
Sakaguchi, K.; Leung, L. R.; Burleyson, C. D.; Xiao, H.; Wan, H. | |
2018-08-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:16页码:8374-8399 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The Amazon forest plays an important role in the tropical circulation and global water and biogeochemical cycles. However, the common Amazon precipitation biases in global climate models undermine our ability to understand future changes in the Amazon and their global consequences. The Community Earth System Model exhibits a persistent wet season dry bias over the southwestern Amazon. The bias is also characterized by inaccurate diurnal timing and intensity of rainfall events. Analysis of a diverse set of simulations suggests that the bias originates from the land model and/or deep convection parameterization. A known land model bias in the partitioning of surface energy fluxes is found not to contribute significantly to the rainfall bias. Key model processes are identified to be the low-level divergent circulation controlling horizontal moisture flow and the sensitivity of the modeled deep convection to the lower tropospheric moisture. The lower tropospheric moisture divergence dictates the spatiotemporal distributions of convective precipitation through parameterized entrainment mixing. While the entrainment effect improves the rainfall diurnal cycle, it suppresses convective precipitation under low-level moisture divergence. Persistent moisture divergence is found over the southwestern Amazon and limits parameterized convective precipitation, particularly in the late afternoon, although uncertainty exists in the low-level flow in the simulation and reanalyses. One way to sustain rainfall in the presence of low-level divergence is a convective trigger based on both the moisture and temperature changes in the free troposphere, which is shown to help in reducing the dry bias. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445331900002 |
WOS关键词 | BOUNDARY LAYER INTERACTIONS ; TERRESTRIAL CARBON-CYCLE ; COLUMN WATER-VAPOR ; DIURNAL-CYCLE ; SOUTH-AMERICA ; DEEP CONVECTION ; ATMOSPHERIC CONTROLS ; CLIMATE SIMULATIONS ; HYDROLOGIC-CYCLE ; WESTERN PACIFIC |
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/32581 |
专题 | 气候变化 |
作者单位 | Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | Sakaguchi, K.,Leung, L. R.,Burleyson, C. D.,et al. Role of Troposphere-Convection-Land Coupling in the Southwestern Amazon Precipitation Bias of the Community Earth System Model Version 1 (CESM1)[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(16):8374-8399. |
APA | Sakaguchi, K.,Leung, L. R.,Burleyson, C. D.,Xiao, H.,&Wan, H..(2018).Role of Troposphere-Convection-Land Coupling in the Southwestern Amazon Precipitation Bias of the Community Earth System Model Version 1 (CESM1).JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(16),8374-8399. |
MLA | Sakaguchi, K.,et al."Role of Troposphere-Convection-Land Coupling in the Southwestern Amazon Precipitation Bias of the Community Earth System Model Version 1 (CESM1)".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.16(2018):8374-8399. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论