<div dir="ltr"><h2>Not exactly groundbreaking news, given this has been predicted for decades; but this study offers even more science to support this predication.</h2><p>----------------------------------------------------<br>
</p><h2><a href="http://www.noaanews.noaa.gov/stories2013/20130403_ncdcextremeprecipitationstudy.html">http://www.noaanews.noaa.gov/stories2013/20130403_ncdcextremeprecipitationstudy.html</a><br></h2><h2>New study: A warming world will further intensify extreme precipitation events</h2>
<p id="releaseDate">April 4, 2013</p><p>According to a newly-published NOAA-led study in <em>Geophysical Research Letters, </em>as
the globe warms from rising atmospheric concentrations of greenhouse
gases, more moisture in a warmer atmosphere will make the most extreme
precipitation events more intense. </p>
<p>The study, conducted by a team of researchers from the North
Carolina State University’s Cooperative Institute for Climate and
Satellites-North Carolina (CICS-NC), <a href="http://www.ncdc.noaa.gov/">NOAA’s National Climatic Data Center</a>
(NCDC), the Desert Research Institute, University of
Wisconsin-Madison, and ERT, Inc., reports that the extra moisture due
to a warmer atmosphere dominates all other factors and leads to notable
increases in the most intense precipitation rates.</p><p>The study also shows a 20-30 percent expected increase in the
maximum precipitation possible over large portions of the Northern
Hemisphere by the end of the 21st century if greenhouse gases continue
to rise at a high emissions rate.</p>
<p>“We have high confidence that the most extreme rainfalls will
become even more intense, as it is virtually certain that the
atmosphere will provide more water to fuel these events,” said Kenneth
Kunkel, Ph.D., senior research professor at CICS-NC and lead author of
the paper. </p>
<p>The paper looked at three factors that go into the maximum
precipitation value possible in any given location: moisture in the
atmosphere, upward motion of air in the atmosphere, and horizontal
winds. The team examined climate model data to understand how a
continued course of high greenhouse gas emissions would influence the
potential maximum precipitation. While greenhouse gas increases did not
substantially change the maximum upward motion of the atmosphere or
horizontal winds, the models did show a 20-30 percent increase in
maximum <em>moisture</em> in the atmosphere, which led to a corresponding increase in the maximum precipitation value.</p><p>The findings of this report could inform “design values,” or
precipitation amounts, used by water resource managers, insurance and
building sectors in modeling the risk due to catastrophic precipitation
amounts. Engineers use design values to determine the design of water
impoundments and runoff control structures, such as dams, culverts, and
detention ponds. </p>
<p>“Our next challenge is to translate this research into local and
regional new design values that can be used for identifying risks and
mitigating potential disasters. Findings of this study, and others like
it, could lead to new information for engineers and developers that
will save lives and major infrastructure investments,” said Thomas R.
Karl, L.H.D., director of NOAA’s NCDC in Asheville, N.C., and co-author
on the paper.</p>
<p>The study,<a href="http://www.noaanews.noaa.gov/exit.html?http%3A%2F%2Fonlinelibrary.wiley.com%2Fdoi%2F10.1002%2Fgrl.50334%2Fabstract"> <em>Probable Maximum Precipitation (PMP) and Climate Change</em></a>, can be viewed online.</p>
<p>------------------------------------------</p><p>Vision2020 Post: Ted Moffett<br></p></div>