globalchange  > 气候减缓与适应
DOI: 10.1002/joc.5880
WOS记录号: WOS:000459665000037
论文题名:
Climatological representation of mesoscale convective systems in a dynamically downscaled climate simulation
作者: Haberlie, Alex M.1; Ashley, Walker S.2
通讯作者: Haberlie, Alex M.
刊名: INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN: 0899-8418
EISSN: 1097-0088
出版年: 2019
卷: 39, 期:2, 页码:1144-1153
语种: 英语
英文关键词: climate modeling ; mesoscale convective systems ; convolutional neural network
WOS关键词: WEATHER ; PRECIPITATION ; RAINFALL ; BOW ; RADAR ; PERFORMANCE ; PREDICTION ; MORPHOLOGY ; TRENDS ; STORMS
WOS学科分类: Meteorology & Atmospheric Sciences
WOS研究方向: Meteorology & Atmospheric Sciences
英文摘要:

This research assesses the utility and validity of using simulated radar reflectivity to detect potential changes in linear and nonlinear mesoscale convective system (MCS) occurrence in the Midwest United States between the early and late 21st century using convection-permitting climate simulation output. These data include a control run and a pseudo-global warming (PGW) run that is based on RCP 8.5. First, using a novel segmentation, classification, and tracking procedure, MCS tracks are extracted from observed and simulated radar reflectivity. Next, a comparison between observed and the control run MCS statistics is performed, which finds a negative summertime bias that agrees with previous work. Using a convolutional neural network to perform probabilistic predictions, the MCS dataset is further stratified into highly organized, quasi-linear convective systems (QLCSs)which can include bow echoes, squall lines, and line echo wave patternsand generally less-organized, non-QLCS events. The morphologically stratified data reveal that the negative MCS bias in this region is largely driven by too few QLCSs. Although comparisons between the control run and a PGW run suggest that all MCS events are less common in the future (including QLCS and non-QLCS events), these changes are not spatially significant, whereas the biases between the control run and observations are spatially significant. A discussion on the importance and challenges of simulating QLCSs in convection-permitting climate model runs is provided. Finally, potential avenues of exploration are suggested related to the aforementioned issues.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/128754
Appears in Collections:气候减缓与适应

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作者单位: 1.Louisiana State Univ, Dept Geog & Anthropol, Baton Rouge, LA 70803 USA
2.Northern Illinois Univ, Dept Geog & Atmospher Sci, De Kalb, IL 60115 USA

Recommended Citation:
Haberlie, Alex M.,Ashley, Walker S.. Climatological representation of mesoscale convective systems in a dynamically downscaled climate simulation[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019-01-01,39(2):1144-1153
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