ẢNH HƯỞNG CỦA MƯA ĐẦU MÙA TỚI ĐỘ DÀY QUANG HỌC SOL KHÍ TẠI BẠC LIÊU

• Published in: VIETNAM JOURNAL OF EARTH SCIENCES
• Main Author: Thanh, Pham Xuan
• Format: Article in Journal/Newspaper
• Language: English
• Published: Publishing House for Science and Technology 2011
• Subjects: Aerosol Robotic Network
• Online Access: http://vjs.ac.vn/index.php/jse/article/view/264; https://doi.org/10.15625/0866-7187/33/1/264

Impact of rainfall in summer onseting monsoon on aerosol optical depth in Bac LieuImpact of rainfall in summer onseting monsoon on the Aerosol Optical Depth (hereafter AOD) and size distribution ofaerosols elements were evaluated in the case of the rainy season in 2003 based on hourly rainfall data in Bac Lieu andAOD data from Aerosol Robotic Network (AERONET). First, we specify the onset of summer monsoon over theSouthern Vietnam and the rainy days in the early rainfall season is also detected in 2003 from Bac Lieu rain gauge data.After that, effect of early season rainfall in 2003 on AOD and size distribution is evaluated by the decrease of AOD at500nm and the change of Angstrom parameters. Results show that the onset of the summer monsoon over the SouthernVietnam in 2003 is 4-May. At that time, we detected 3 rainy days from Bac Lieu rain gauge station data, it is 1, 3 and 4with the rainfall is 4, 7.5 and 5.5, respectively. The rains of early season rainfall in 2003 significantly reduced the aerosoloptical depth. After 3 rainy days, AOD at 500nm wavelength decreased from 0.4 to 0.1. The rain in early season rainfallalso changed size distribution of aerosols elements in the atmosphere. The aerosols elements have large size is sweptaway by the first rainy day. The β decreased from 0.23 (30 April) to 0.07 (3 May) and 0.04 (5 May). The difference ofAOD at 500nm between the first month of rainfall season and the last month of dry season in period 2003 - 2009 is0.025. The AOD average rainfall season and dry season is 0.29 and 0.19, respectively. The AOD in 500nm average offour dry months (Dec, Jan, Feb and Mar) is 0.29 and of rainy months (Jun, Jul, Aug, and Sep) is 0.19.