{"id":11144,"date":"2017-01-05T07:14:09","date_gmt":"2017-01-05T07:14:09","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=11144"},"modified":"2017-01-05T07:14:45","modified_gmt":"2017-01-05T07:14:45","slug":"study-finds-extreme-storms-ahead-california","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/study-finds-extreme-storms-ahead-california\/","title":{"rendered":"Study finds more extreme storms ahead for California"},"content":{"rendered":"

New technique predicts frequency of heavy precipitation with global warming.<\/strong><\/em><\/span><\/p>\n

\"\"
MIT scientists have found that extreme precipitation events in California should become more frequent as the Earth\u2019s climate warms over this century.<\/figcaption><\/figure>\n

CAMBRIDGE, Mass. —\u00a0On December 11, 2014, a freight train of a storm steamed through much of California, deluging the San Francisco Bay Area with three inches of rain in just one hour. The storm was fueled by what meteorologists refer to as the \u201cPineapple Express\u201d \u2014 an atmospheric river of moisture that is whipped up over the Pacific\u2019s tropical waters and swept north with the jet stream.<\/span><\/p>\n

By evening, record rainfall had set off mudslides, floods, and power outages across the state. The storm, which has been called California\u2019s \u201cstorm of the decade,\u201d is among the state\u2019s most extreme precipitation events in recent history.<\/span><\/p>\n

Now MIT scientists have found that such extreme precipitation events in California should become more frequent as the Earth\u2019s climate warms over this century. The researchers developed a new technique that predicts the frequency of local, extreme rainfall events by identifying telltale large-scale patterns in atmospheric data. For California, they calculated that, if the world\u2019s average temperatures rise by 4 degrees Celsius by the year 2100, the state will experience three more extreme precipitation events than the current average, per year.<\/span><\/p>\n

The researchers, who have published their results in the Journal of Climate<\/a><\/em>, say their technique significantly reduces the uncertainty of extreme storm predictions made by standard climate models.<\/span><\/p>\n

\u201cOne of the struggles is, coarse climate models produce a wide range of outcomes. [Rainfall] can increase or decrease,\u201d says Adam Schlosser, senior research scientist in MIT\u2019s Joint Program on the Science and Policy of Global Change. \u201cWhat our method tells you is, for California, we\u2019re very confident that [heavy precipitation] will increase by the end of the century.\u201d<\/span><\/p>\n

The research was led by Xiang Gao, a research scientist in the Joint Program on the Science and Policy of Global Change. The paper\u2019s co-authors include Paul O\u2019Gorman, associate professor of earth, atmospheric, and planetary sciences; Erwan Monier, principal research scientist in the Joint Program; and Dara Entekhabi, the Bacardi Stockholm Water Foundations Professor of Civil and Environmental Engineering.<\/span><\/p>\n

Large-scale connection<\/strong><\/span><\/p>\n

Currently, researchers estimate the frequency of local heavy precipitation events mainly by using precipitation information simulated from global climate models. But such models typically carry out complex computations to simulate climate processes across hundreds and even thousands of kilometers. At such coarse resolution, it\u2019s extremely difficult for such models to adequately represent small-scale features such as moisture convection and topography, which are essential to making accurate predictions of precipitation.<\/span><\/p>\n

To get a better picture of how future precipitation events might change region by region, Gao decided to focus on not simulated precipitation but large-scale atmospheric patterns, which climate models are able to simulate much more reliably.<\/span><\/p>\n

\u201cWe\u2019ve actually found there\u2019s a connection between what climate models do really well, which is to simulate large-scale motions of the atmosphere, and local, heavy precipitation events,\u201d Schlosser says. \u201cWe can use this association to tell how frequently these events are occurring now, and how they will change locally, like in New England, or the West Coast.\u201d<\/span><\/p>\n

Weather snapshots<\/strong><\/span><\/p>\n

While definitions vary for what is considered an extreme precipitation event, in this case the researchers defined such an event as being within the top 5 percent of a region\u2019s precipitation amounts in a particular season, over periods of almost three decades. They focused their analysis on two areas: California and the Midwest, regions which generally experience relatively high amounts of precipitation in the winter and summer, respectively.<\/span><\/p>\n

For both regions, the team analyzed large-scale atmospheric features such as wind currents and moisture content, from 1979 to 2005, and noted their patterns each day that extreme precipitation occurred. Using statistical analysis, the researchers identified telltale patterns in the atmospheric data that were associated with heavy storms.<\/span><\/p>\n

\u201cWe essentially take snapshots of all the relevant weather information, and we find a common picture, which is used as our red flag,\u201d Schlosser explains. \u201cWhen we examine historical simulations from a suite of state-of-the-art climate models, we peg every time we see that pattern.\u201d<\/span><\/p>\n

Using the new scheme, the team was able to reproduce collectively the frequency of extreme events that were observed over the 27-year period. More importantly, the results are much more accurate than those based on simulated precipitation from the same climate models.<\/span><\/p>\n

\u201cNone of the models are even close to the observations,\u201d Gao says. \u201cAnd regardless of the combination of atmospheric variables we used, the new schemes were much closer to observations.\u201d<\/span><\/p>\n

\u201cActionable information\u201d<\/strong><\/span><\/p>\n

Bolstered by their results, the team applied their technique to large-scale atmospheric patterns from climate models to predict how the frequency of heavy storms may change in a warming climate in California and the Midwest over the next century. They analyzed each region under two climate scenarios: a \u201cbusiness as usual\u201d case, in which the world is projected to warm by 4 degrees Celsius by 2100, and a policy-driven case, in which global environmental policies that regulate greenhouse gases should keep the temperature increase to 2 degrees Celsius.<\/span><\/p>\n

For each scenario, the team flagged those modeled large-scale atmospheric patterns that they had determined to be associated with heavy storms. In the Midwest, yearly instances of summer extreme precipitation decreased slightly under both warming scenarios, although the researchers say the results are not without uncertainty.<\/span><\/p>\n

For California, the picture is much clearer: Under the more intense scenario of global warming, the state will experience three more extreme precipitation events per year, on the order of the December 2014 storm. Under the policy-driven scenario, Schlosser says \u201cthat trend is cut in half.\u201d<\/span><\/p>\n

The team is now applying its technique to predict changes in heat waves from a globally warming climate. The researchers are looking for patterns in atmospheric data that correlate with past heat waves. If they can more reliably predict the frequency of heat waves in the future, Schlosser says that can be extremely helpful for the long-term maintenance of power grids and transformers.<\/span><\/p>\n

\u201cThat is actionable information,\u201d Schlosser says.<\/span><\/p>\n

This research was supported in part by the National Science Foundation, the National Aeronautics and Space Administration, and the Department of Energy.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

New technique predicts frequency of heavy precipitation with global warming. CAMBRIDGE, Mass. —\u00a0On December 11, 2014, a freight train of a storm steamed through much of California, deluging the San Francisco Bay Area with three inches of rain in just one hour. The storm was fueled by what meteorologists refer to as the \u201cPineapple Express\u201d […]<\/p>\n","protected":false},"author":6,"featured_media":11145,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,17],"tags":[],"class_list":["post-11144","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0-300x200.jpg",300,200,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",95,63,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",511,341,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",96,64,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/01\/MIT-Rain-Ahead_0.jpg",150,100,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"Environment<\/a> Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/11144","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=11144"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/11144\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/11145"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=11144"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=11144"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=11144"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}