'Half of world's annual precipitation in just 12 days'

Half of the measured global precipitation in a year falls in just 12 days, an analysis of data collected at weather stations across the globe.

By century's end, climate models project that this lopsided distribution of rain and snow is likely to become even more skewed, with half of annual precipitation falling in 11 days.

Previous studies have shown that we can expect both an increase in extreme weather events and a smaller increase in average annual precipitation in the future as the climate warms, but researchers are still exploring the relationship between those two trends.

"This study shows how those two pieces fit together. "What we found is that the expected increases happen when it's already the wettest-the rainiest days get rainier," said Angeline Pendergrass, a scientist at the National Center for Atmospheric Research (NCAR) in the US.

The findings, published in the journal Geophysical Research Letters, suggests that flooding and the damage associated with it could also increase.

The research results are also a concern for agriculture, which is more productive when rainfall is spread more evenly over the growing season.

Scientists who study extreme precipitation -- and how such events may change in the future -- have used a variety of metrics to define what qualifies as "extreme."

Pendergrass noticed that in some cases the definitions were so broad that extreme precipitation events actually included the bulk of all precipitation.

In those instances, "extreme precipitation" and "average precipitation" became essentially the same thing, making it difficult for scientists to understand from existing studies how the two would change independently as the climate warms.

Other research teams have also been grappling with this problem. For example, a recent paper tried to quantify the unevenness of precipitation by adapting the Gini coefficient, a statistical tool often used to quantify income inequality, to instead look at the distribution of rainfall.

Pendergrass wanted to find something even simpler and more intuitive that could be easily understood by both the public and other scientists.

In the end, she chose to quantify the number of days it would take for half of a year's precipitation to fall.

"I would have guessed the number would be larger -- perhaps a month. But when we looked at the median, or midpoint, from all the available observation stations, the number was just 12 days," said Pendergrass.

Researchers used data from 185 ground stations for the 16 years from 1999 through 2014, a period when measurements could be validated against data from the Tropical Rainfall Measuring Mission (TRMM) satellite.

While the stations were dispersed globally, the majority were in North America, Eurasia, and Australia.

To look forward, the scientists used simulations from 36 of the world's leading climate models that had data for daily precipitation.

Then they pinpointed what the climate model projections for the last 16 years of this century would translate to for the individual observation stations.

They found that total annual precipitation at the observation stations increased slightly in the model runs, but the additional precipitation did not fall evenly. Instead, half of the extra rain and snow fell over just six days.

This contributed to total precipitation also falling more unevenly than it does today, with half of a year's total precipitation falling in just 11 days by 2100, compared to 12 in the current climate.