Abstract
The Journal of the National Science Foundation of Sri Lanka publishes the results of research in all aspects of Science and Technology. The journal also has a website at http://www.nsf.gov.lk/. 2020 Impact Factor: 0.515The JNSF provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
Highlights
Climate change is one of the most discussed issues in global fora today
There is strong evidence that human activities leading to increased greenhouse gas (GHG) concentrations in the atmosphere are the principal cause of long-term climate change, and the observed warming in the last 50 years[3,5]
As June rainfall is brought by the South-West monsoon, this observation shows that El Niño had weakened the SouthWest monsoon in Sri Lanka during 1950-1989
Summary
Climate change is one of the most discussed issues in global fora today. It has been identified as a major threat to natural and man-made ecosystems and human civilization in the 21st century and thereafter. The 100-year linear trend of 0.74 (±0.18)oC from 1906 to 2005 given in the Fourth Assessment Report[3] showed a greater rate of warming than that given in the TAR This was owing to 11 of the 12 years from 1995 to 2006 being among the 12 warmest years since air temperature measurements began in 1850. An interesting finding of AR4 has been that the difference between day and night temperatures (i.e. the diurnal temperature range, DTR) has not changed during the period from 1979 to 2004, implying that both temperatures have increased in equal proportions This was in contrast to the finding, based on data from 1950 to 1993, in the TAR that DTR had decreased. The higher evaporation rates have increased the incidence of salinity in the lower latitudes[3]
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