With insufficient rainfalls this spring, the government has implemented water rationing measures in certain areas in northern and central Taiwan.

To cope with the change of rainfall patterns caused by global warming, experts are urging the government to adjust the nation's policy in the distribution of water resources, before the drought gets worse.

This is the second year of the La Nina phenomenon.

In February and March, the weather should have been rainy but it didn't rain as often.

The Central Weather Bureau and scholars believe the phenomenon of less rain would continue into May and June, the usual plum rain season.

According to the study of Academia Sininca, the effect of global warming could bring increasing amount of rainfall and show a polarizing pattern.

The research team uses the weather pattern to estimate.

By the end of the twenty first century, the precipitation would increase by 15 percent and the drought season would be reduced by as much as 15 percent.

Based on the rainfall records of Taiwan in the past 30 years, it's apparent the rainfall pattern in Central and Southern Taiwan is polarizing.

Take Kaohsiung in 2009 for example, if the typhoon Morakot hadn't brought that much rain, the average rainfall of that year was only half of what it had in previous years.

The polarizing rain pattern could bring huge floods or debris flow in rain season but cause drought in dry season.

Scholars suggest the government to re-evaluate its current water resources strategies.

Perhaps the plan to build more water storages could be a way to solve the water shortage problem in Central and Southern Taiwan.