Temperature Inversions over the Inland Indochina Revealed by GAME-T Enhanced Rawinsonde Observations

• Published in: Scientific online letters on the atmosphere Vol. 6; pp. 5 - 8
• Main Authors: Ogino, S-Y, Nodzu, MI, Tachibana, Y, Matsumoto, J, Yamanaka, MD, Watanabe, A
• Format: Journal Article
• Language: Japanese
• Published: 01.01.2010
• ISSN: 1349-6476; 1349-6476
• DOI: 10.2151/sola.2010-002

Detailed structures and variability of lower tropospheric temperature inversions are investigated, using two sets of high resolution (50 m in height and 3 hours in time) rawinsonde data obtained by the GAME-T enhanced rawinsonde observations conducted over the inland Indochina Peninsula in March 1997 and January 2000. In both observation periods, the strong inversions were observed at 3-4 km height. The causes of variations in their occurrence time and height are discussed by comparing them with meteorological conditions. Five processes are found to be responsible for the inversion variations: 1) cold-air advection accompanied by a cold-surge event, 2) cloud-top radiative cooling, 3) adiabatic heating due to subsidence, 4) shallow convection at or near the observation site, and 5) diurnal heating process due to boundary-layer growth.