globalchange  > 气候变化与战略
DOI: 10.1175/JCLI-D-18-0559.1
Scopus ID: 2-s2.0-85061814227
A radar-based climatology of mesoscale convective systems in the United States
Author: Haberlie A.M.; Ashley W.S.
Source Publication: Journal of Climate
ISSN: 8948755
Publishing Year: 2019
Volume: 32, Issue:5
pages begin: 1591
pages end: 1606
Language: 英语
Keyword: Climate variability ; Climatology ; Convective storms ; Mesoscale systems
Scopus Keyword: Aquifers ; Climatology ; Image segmentation ; Land use ; Landforms ; Rain ; Recharging (underground waters) ; Tracking radar ; Agricultural land use ; Climate variability ; Convective storms ; Meso-scale systems ; Mesoscale Convective System ; Radar reflectivities ; Seasonal and interannual variability ; Warm season rainfall ; Storms ; Zea mays
English Abstract: This research applies an automated mesoscale convective system (MCS) segmentation, classification, and tracking approach to composite radar reflectivity mosaic images that cover the contiguous United States (CONUS) and span a relatively long study period of 22 years (1996-2017). These data afford a novel assessment of the seasonal and interannual variability of MCSs. Additionally, hourly precipitation data from 16 of those years (2002-17) are used to systematically examine rainfall associated with radar-derived MCS events. The attributes and occurrence of MCSs that pass over portions of the CONUS east of the Continental Divide (ECONUS), as well as five author-defined subregions-North Plains, High Plains, Corn Belt, Northeast, and Mid-South-are also examined. The results illustrate two preferred regions for MCS activity in the ECONUS: 1) the Mid-South and Gulf Coast and 2) the Central Plains and Midwest. MCS occurrence and MCS rainfall display a marked seasonal cycle, with most of the regions experiencing these events primarily during the warm season (May-August). Additionally, MCS rainfall was responsible for over 50% of annual and seasonal rainfall for many locations in the ECONUS. Of particular importance, the majority of warm-season rainfall for regions with high agricultural land use (Corn Belt) and important aquifer recharge properties (High Plains) is attributable to MCSs. These results reaffirm that MCSs are a significant aspect of the ECONUS hydroclimate. © 2019, American Meteorological Society.
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Haberlie A.M.,Ashley W.S.. A radar-based climatology of mesoscale convective systems in the United States[J]. Journal of Climate,2019-01-01,32(5)
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