Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD028892 |
Northern Hemisphere Blocking in similar to 25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations | |
Jiang, Tianyu1; Evans, Katherine1; Branstetter, Marcia1; Caldwell, Peter2; Neale, Richard3; Rasch, Philip J.4; Tang, Qi2; Xie, Shaocheng2 | |
2019-03-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:5页码:2465-2482 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The fidelity of a prerelease Energy Exascale Earth System Model (E3SM) in reproducing atmospheric blocking is evaluated with similar to 100- and similar to 25-km horizontal resolution within ensembles of simulations with Atmospheric Modeling Intercomparison Protocol-type active atmosphere and land surface configurations. This evaluation is conducted via a hybrid bidimensional blocking index based on geopotential height. The lower-resolution model correctly reproduces the spatial distribution of blocking frequency maxima over the Northern Hemisphere. However, it overestimates the blocking frequency over western North America, the Pacific Northeast, and Eastern Europe regions and largely underestimates blocking frequency over the North Atlantic. The high-resolution model significantly reduces the bias over the North Pacific region, particularly over western North America, but the biases over the North Atlantic blocking sector mostly persist. A diagnosis of the mean flow reveals that the subtropical jet is displaced poleward in the high-resolution model with a jet core speed that is generally more realistic. A time scale analysis of eddies suggests that synoptic eddies associated with the blocking events are increased in the high-resolution configuration. The discrepancy between the models implies that both synoptic and low-frequency eddies play significant roles in determining North Pacific blocking, whereas North Atlantic blocking is mainly driven by low-frequency eddies. The characteristic time scale associated with blocking events is also investigated, and it shows that both model resolutions produce events that are overly persistent. However, the bias in the high-resolution model is reduced, which reflects more efficient energy dispersion with higher resolution. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462139800006 |
WOS关键词 | EARTH SYSTEM MODEL ; EDDY-DRIVEN JET ; STRATOSPHERIC VARIABILITY ; MEAN-FLOW ; VERSION 1 ; CLIMATE ; FREQUENCY ; ATLANTIC ; CIRCULATION ; PROPAGATION |
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/181670 |
专题 | 气候变化 |
作者单位 | 1.Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA; 2.Lawrence Livermore Natl Lab, Livermore, CA USA; 3.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA; 4.Pacific Northwest Natl Lab, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | Jiang, Tianyu,Evans, Katherine,Branstetter, Marcia,et al. Northern Hemisphere Blocking in similar to 25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(5):2465-2482. |
APA | Jiang, Tianyu.,Evans, Katherine.,Branstetter, Marcia.,Caldwell, Peter.,Neale, Richard.,...&Xie, Shaocheng.(2019).Northern Hemisphere Blocking in similar to 25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(5),2465-2482. |
MLA | Jiang, Tianyu,et al."Northern Hemisphere Blocking in similar to 25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.5(2019):2465-2482. |
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