Japan Geoscience Union Meeting 2019

Presentation information

[E] Poster

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS03] Large-scale moisture and organized cloud systems

Tue. May 28, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Hiroaki Miura(The University of Tokyo), Atsushi Hamada(University of Toyama), Satoru Yokoi(Japan Agency for Marine-Earth Science and Technology), Masaki Satoh(Atmosphere and Ocean Research Institute, The University of Tokyo)

[AAS03-P05] Interannual Modulation of the Local Hadley Circulation on Clouds, Radiation and Diagnostic Fields over the Western North Pacific

*Xinyue Wang1, Hironobu Iwabuchi1 (1.Tohoku Univ.)

Keywords:Regional Hadley cell, Cloud and radiation, Precipitation pattern

Variation of the local Hadley cell (HC) northern boundary over the western North Pacific, and its interannual imprints on the tropospheric clouds and atmospheric fields are examined with observation and reanalysis data for the winter season from December 1982 to February 2016. The poleward shift of the local HC subsiding edge is marked by anomalous rising motion, large-scale decreased static stability, and corresponding increases of the midlevel cloud amount over the climatological sinking zone around 30N. These responses primarily locate over the continental and coastal areas instead of the open oceans. Concomitant with the increasing cloud fraction, a net negative top-of-atmosphere radiation anomaly is identified, and the main contributor is suggested to be the cumulus congestus, whose top pressures are in a range of 440–680 hPa, and optical thicknesses in a range of 23–60. Interactions between this specific cloud type and the vertical moist instability, and their constrains on the precipitation field is further discussed.