Atmospheric Sciences Seminar

March 31, 3:30pm - 4:30pm
Mānoa Campus, Virtual Meeting Add to Calendar

A diagnostic Study of a Mei-Yu Front Associated with Heavy Rainfall over Taiwan during 6-7 June 2003

Chuan-Kai Wang
Ph.D. Candidate
Department of Atmospheric Sciences
School of Ocean and Earth Science and Technology
University of Hawai'i at Manoa

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When: March 31, 2021 at 3:30PM HST

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The Mei-Yu jet/front affecting the Taiwan area on 6-7 June, 2003 during the early summer rainy season exhibits baroclinic charactistics as found in recent studies. Appreciable horizontal temperature gradients exist within the frontal zone, especially below the 850-hPa level and above the 400-hPa levels as the cold, dry postfrontal northeasterlies from the Asian continent advance southeastward behind an upper-level tough and converge with warm, moist southwesterly monsoon flow from the subtropical ocean. It has a marked northward vertical tilt with a frontal slope ~ 1/100. A thermally direct circulation across the jet/front system with ascending motion within the prefrontal warm, moist air and descending motion within the postfrontal cold, dry air is evident.

On 7 June 2003, widespread heavy rainfall (> 300 mm day-1) occurred over southwestern Taiwan. In addition to the subsynoptic low-level jet (SLLJ) associated with the jet/front system, a marine boundary layer jet (MBLJ) exists upstream of the southwestern Taiwan over the northern South China Sea (NSCS). The Integrated Vapor Transport (IVT) from the surface to the 850-hPa level by the MBLJ > 400 kg m-1 s-1 brings in the moisture over the Taiwan area. The MBLJ is formed due to large pressure gradients between a developing frontal cyclone associated with the Mei-Yu front over the southern China coast and the West Pacific Subtropical High (WPSH).

Event Sponsor
SOEST Atmospheric Sciences, Mānoa Campus

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