BEGIN:VCALENDAR
PRODID:-//University of Hawaii//UH Events Calendar//EN
VERSION:2.0
METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:Pacific/Honolulu
BEGIN:STANDARD
TZOFFSETFROM:-1000
TZOFFSETTO:-1000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20260908T101135Z
DESCRIPTION:Diagnostic Analysis of Heavy Rainfall Events Over the Yangtze River Valley During the Mei-Yu Season 2020\n\nMr. Qizhen Sun\n\nMasters Candidate\n\nDepartment of Atmospheric Sciences, S.O.E.S.T.\n\nUniversity of Hawaii at Manoa\n\nDate: Monday, November 30, 2020\n\nTime: 3 p.m. HST\n\nZoom Meeting: https://zoom.us/j/92500493986?pwd=QlJUbHBVeWo4d2E5ZkdCRlZZNG5Bdz09\n\nMeeting ID: 925 0049 3986\n\nPasscode: FiaE4F\n\nAbstract:\n\nDuring the 2020 early summer rainy season of the southern China plain, a series of unprecedented heavy Mei-Yu precipitation events occurred over the Yangtze River Valley region accompanied by widespread extreme flooding. Compared with the past long-term mean (2011–2019), the Mei-Yu precipitation over the Yangtze River Valley in 2020 shows extremely heavy rainfall events that occurred throughout the prolonged Mei-Yu season (62 days in total). Using the CFSv2 reanalysis data with a 6-hourly interval, a low-level boundary layer jet (> 10 meters per second) around the 925-hPa over the northern Southern China Sea is diagnosed.\n\nThis is referred to as the Marine Boundary Layer Jet (MBLJ) and it lasted for almost the entire Mei-Yu season (from June 1st to July 31st) in 2020. The MBLJ is mainly related to the large sub-synoptic scale pressure gradients between a stronger than normal West Pacific Subtropical High (WPSH) and a pronounced Southwest Vortex originating from the lee side of the Tibet Plateau.  During the Mei-Yu season in 2020, the MBLJ over the northern Southern China Sea plays a key role in transporting the low-level moisture from the subtropical ocean to the southern China plain.\n\nIn addition to the moisture supply by the MBLJ, a southwesterly subsynoptic Low-Level (SLLJ) along the Mei-Yu front was present as a result of the secondary circulation associated with the frontal circulation. The MBLJ encountered the SLLJ along the Mei-Yu front after reaching the southern China plain. The MBLJ brought in excessive moisture from the northern South China Sea to the central China plain whereas the rainfall production is mainly related to the secondary circulation associated with the Mei-Yu jet/front system. Moreover, the moisture transport is dominated by the mean flow with much less contribution by the transient mode. Under this favorable synergistic effect caused by MBLJ and SLLJ together, a series of unprecedented long-lasting rainfall events occurred over the Yangtze River Valley during the entire 2020 Mei-Yu season.
DTEND;TZID=Pacific/Honolulu:20201201T020000Z
DTSTAMP:20260908T101135Z
DTSTART;TZID=Pacific/Honolulu:20201201T010000Z
LAST-MODIFIED:20260908T101135Z
LOCATION:Virtual Meeting
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=en-us:Atmospheric Sciences Master's Defense
TRANSP:OPAQUE
UID:178889829538074web-support-l@lists.hawaii.edu
END:VEVENT
END:VCALENDAR