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Observed Evidence of Enhanced Probability of Mesoscale Convective System Initiations due to Land Surface Heterogeneity in Semiarid East Asia

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Title: Observed Evidence of Enhanced Probability of Mesoscale Convective System Initiations due to Land Surface Heterogeneity in Semiarid East Asia
Authors: Teramura, Hiroki Browse this author
Sato, Tomonori Browse this author →KAKEN DB
Tamura, Kenta Browse this author
Issue Date: 27-Jun-2019
Publisher: 公益社団法人 日本気象学会
Journal Title: SOLA (Scientific Online Letters on the Atmosphere)
Volume: 15
Start Page: 143
End Page: 148
Publisher DOI: 10.2151/sola.2019-026
Abstract: This study investigated the impact of land surface heterogeneity on Mesoscale Convective System (MCS) initiations in East Asia, using geostationary satellite data during June-August from 1996 through 2018. The detected MCSs over land exhibited clear diurnal variation with the lowest existence frequency at 10:00 and highest initiation frequency during 12:00-17:00 local time. To quantify land surface heterogeneity, the spatial standard deviation of equivalent Black-Body Temperature (TBB) within a cloud-free 0.35 degrees x 0.35 degrees box (sigma LSTBB:Land Surface TBB) was computed for 10:00 each day. A comparison of the sigma LSTBB and MCS databases revealed that the probability of MCS initiations increased with increasing sigma LSTBB in East Mongolia while the probability was not sensitive to sigma LSTBB in East China. This indicated that MCSs tend to form over heterogeneous land surface conditions in the semiarid region. We found that the impact of land surface heterogeneity on MCS initiations was highest over flat terrain in East Mongolia, where the convection trigger due to topographically-induced circulation was absent. These results suggest that the impact of land surface heterogeneity on MCS initiations during the warm season varies with climate zones and terrain complexities in East Asia, with strongest impact in semiarid and flat regions.
Rights: https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/75178
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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