The weather phenomenon known as La Nina will have an impact this year not seen in decades, resulting in a temperature drop in Thailand of 2 degrees Celsius, according to a study supervised by Chulalongkorn University.
La Nina will also result in a premature wet season, in addition to a 30-year-record drop in temperature, researcher Arnont Sanitwong na Ayutthaya told a Bangkok technical seminar.
The study was based in Chiang Khan district in Loei province because it had experienced record low temperatures in two nine-year cycles: 20 degrees for 18 weeks from 1975-1984, and 21 degrees for 20 weeks from 1995-2004.
La Nina is now causing a drop in the temperature of seawater in the central and eastern Pacific Ocean near the equator.
After the temperature drop this year, global warming will result in a temperature increase of 1 degree in Chiang Khan district in the next 30 years. This, coupled with affects from large dams built on the mekong River in China, could affect the tourism industry in the area.
A study centre at Chulalongkorn University and an environmental study centre based in Sweden jointly conducted the study in Chiang Khan on the relevance of temperature diversity.
A senior Meteorological Department official, Somchai Baimuang, said rain was more frequent this year as a result of La Nina during the wet season, which was longer than during other years without La Nina's effects.
Somchai, speaking at the same seminar, echoed Arnont over the temperature drop for 2 degrees this year.
He said 10 provinces that would face a temperature drop were Tak, Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Loei, Udon Thani, Nong Khai and Sakon Nakhon.