ความเป็นไปได้ในการศึกษาการไหลเวียนของมวลน้ำชั้นล่างในอ่าวไทย โดยใช้ตัวติดตามกัมมันตรังสีเรเดียม-226 ตามธรรมชาติ / เผชิญโชค จินตเศรณี = A feasibility study on circulation of deep water masses in the Gulf of Thailand using natural radium-226 radiotracer / Pachoenchoke Jintasaeranee
Fifty-nine water samples from sub-pycnocline level in the Gulf of Thailand and East coast of Malay Peninsula were collected and measured for Ra-226 activity in April to May 1996. MnO2 coated nylon fiber was used for trapping radium isotopes from ͂800 liters seawater samples. The results indicated that efficiency of the MnO2 coated nylon fiber was 52.9%. The deep water masses in the Gulf of Thailand had Ra-226 activity ranged from 1.088 to 12.265 dpm/I. Ra-226 concentration average salinity and average temperature at each station was used as input in the conservative equation for Ra-226 salt, heat and mass balance. These equations were used for calculation of horizontal advection dispersion of deep water masses in the Gulf. The results from calculation indicated that dispersion in y-axis (Ky) were mainly in the range of 1.077*105 to 1.638*106 cm2/s and in x-axis (Kx) were mainly in the range of 1.215*105 to 9.991*106 cm2/s. In April to May 1996, the deep water masses in upper (latitude 10-11 °N) and lower (latitude 4-6 °N) of the Gulf had a little exchanged with the central part (latitude 7-9 °N) where water mass oldest. Deep water in the Gulf of Thailand excited the Gulf on the west side along this coast of Thai-Malay Peninsular. There was a low salinity deep water from the east near Cape Camau that flew across the month of the Gulf and joined with the water from inside the Gulf. Some of these bottom water could be upwelled near Malaysia coast at about 4 °N.