Half of the World’s Annual Rain Falls in Just 12 Days, Study Finds

The findings, which suggest that flooding and the damage associated with it could also increase, have implications for water managers, urban planners, and emergency responders.   (Image: via   pixabay  /  CC0 1.0)
The findings, which suggest that flooding and the damage associated with it could also increase, have implications for water managers, urban planners, and emergency responders. (Image: via pixabay / CC0 1.0)

Currently, half of the world’s measured precipitation that falls in a year falls in just 12 days, according to a new 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.

These results are published in Geophysical Research Letters, a journal of the American Geophysical Union. 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.

Angeline Pendergrass, a scientist at the National Center for Atmospheric Research (NCAR) and the lead author of the new study, said:

The findings, which suggest that flooding and the damage associated with it could also increase, have implications for water managers, urban planners, and emergency responders. The research results are also a concern for agriculture, which is more productive when rainfall is spread more evenly over the growing season.

The research was supported by the U.S. Department of Energy and the National Science Foundation, which is NCAR’s sponsor.

What it means to be extreme

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.

An analysis of rainfall measured at weather stations across the globe between 1999 and 2014 found that the median time it took for half of a year's precipitation to fall was just 12 days. A quarter of annual precipitation fell in just six days, and three-quarters fell in 27 days. (Credit: ©UCAR. Simmi Sinha)

An analysis of rainfall measured at weather stations across the globe between 1999 and 2014 found that the median time it took for half of a year’s precipitation to fall was just 12 days. A quarter of annual precipitation fell in just six days, and three-quarters fell in 27 days. (Image: ©UCAR. Simmi Sinha)

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. The results surprised her, she explained that:

For the analysis, Pendergrass worked with Reto Knutti of the Institute for Atmospheric and Climate Science in Zurich, Switzerland. They 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, Pendergrass said:

Provided by: Laura Snider, National Center for Atmospheric Research [Note: Materials may be edited for content and length.]

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