Daytime Thermodynamic and Airflow Structures over Northeast Bangladesh during the Pre-Monsoon Season: A Case Study on 25 April 2010

作者：Murata Fumie^*; Terao Toru; Kiguchi Masashi; Fukushima Azusa; Takahashi Koji; Hayashi Taiichi; Habib Arjumand; Bhuiyan Md Shameem Hassan; Choudhury Sayeed Ahmed

来源：Journal of the Meteorological Society of Japan, 2011, 89A: 167-179.

DOI：10.2151/jmsj.2011-A11

Simultaneous intensive radiosonde observation at three stations over northeast (Sylhet), central (Dhaka), and northwest (Bogra) Bangladesh was analyzed to describe a three-dimensional thermodynamic and airflow structures on 25 April 2010, in which a distinct nocturnal rainfall occurred at Sylhet. As the observation was conducted in the daytime, the observed structures represent convectively inactive condition in a diurnal cycle. Local circulation was unclear and larger-scale airflow was dominated over Sylhet. The radiosonde observation indicated strong subsidence within 1-5 km over Dhaka and Bogra and within 4-5 km over Sylhet, whereas topographic uplifting of southwesterly airflow was observed within 1-3 km over Sylhet. Temperature profiles of Sylhet up to 3 km were lower than that of other stations, and easterly wind was observed at the surface.

• 出版日期2011-2
• 单位防灾科技学院