{"id":27803,"date":"2017-12-07T11:15:24","date_gmt":"2017-12-07T15:15:24","guid":{"rendered":"http:\/\/www.fondriest.com\/news\/?p=27803"},"modified":"2017-12-06T13:40:58","modified_gmt":"2017-12-06T17:40:58","slug":"groundwater-depletion-causing-surprising-rise-atmospheric-carbon-dioxide","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/groundwater-depletion-causing-surprising-rise-atmospheric-carbon-dioxide.htm","title":{"rendered":"Groundwater Depletion Causing Surprising Rise in Atmospheric Carbon Dioxide"},"content":{"rendered":"

In many cases, new instrumentation leads to new knowledge, which leads to a new publication. But for Warren Wood, visiting professor of hydrogeology at Michigan State University, and his colleague David Hyndman, also a Michigan State University hydrogeologist, their <\/span>new study<\/span><\/a> arose from looking at previously gathered data in a new way.<\/span><\/p>\n

\u201cIn the paper, we estimated that a significant amount of CO2, 1.7 million metric tons per year, was likely being added to the atmosphere because groundwater has been tapped so much in recent years. A number of things went into our calculation. I had 40 years\u2019 worth of groundwater data from my career at the United States Geological Survey (USGS). I also had a lifetime of experience with hydrogeology issues. I\u2019m not sure why the idea occurred to me one morning, but with a back-of-an-envelope calculation, in a couple of hours I had a draft of the paper,\u201d says Wood.<\/span><\/p>\n

As drought conditions have persisted in much of the American West, groundwater is getting scarcer and scarcer. \u201cI especially think of the Ogallala Aquifer,\u201d Wood says. \u201cIt\u2019s the biggest aquifer in America. It goes northward from western Texas to South Dakota and supplies a third of the U.S. And it\u2019s disappearing rapidly.\u201d<\/span><\/p>\n

More groundwater is being pumped out of the aquifer, and thousands of other aquifers, more quickly than it is being replenished by rainfall. The groundwater has 10 to 100 times greater CO2 than surface water due to its subterranean interactions with soil, minerals and bacteria. Though the groundwater would normally store this CO2 for hundreds or thousands of years, when the water is pumped to the surface, the CO2 is released into the atmosphere.<\/span><\/p>\n

In his back-of-the-envelope calculation, Wood considered the chemical equations that contributed to the amount of CO2 in the water. There was variation depending on where the groundwater came from, as sedimentary, igneous and other rock types resulted in different levels of bicarbonate and CO2 molecules in their chemical interactions with the groundwater.<\/span><\/p>\n

\"Groundwater\"

Dr. Stephen Stokes, Reader of Geography, St. Catherines College, U. of Oxford, UK (deceased) faces upper part of High Plains Aquifer, east of Lubbock, TX. (Credit: Warren Wood)<\/p><\/div>\n

Wood used an extensive study of aquifers in the U.S., published by <\/span>Konikow in 2013<\/span><\/a>, which found that in the past 108 years, the total amount of depleted groundwater was estimated to be about 1000 cubic kilometers. A study published by <\/span>Desimone in 2009<\/span><\/a> gave a median bicarbonate concentration of U.S. aquifer samples to be about 190 mg\/L. The Desimone estimation was based on 2003 water samples from eight types of aquifers in 30 aquifer study units of the U.S. Geological Survey, National Water Quality Assessment. Wood estimated that about half the groundwater bicarbonate (95 mg\/L) is converted to CO2, a mass equivalent to 68 million metric tons of CO2 that would occur for 1000 cubic kilometers of depletion. Annually, the U.S. depletion would be about 25 cubic kilometers, giving a CO2 contribution per year of approximately 1.7 million metric tons. Wood and Hyndman were the first to estimate the actual amount of CO2 contributed per year. \u201cIt\u2019s not remotely as much as the contribution of CO2 from industry,\u201d says Wood. \u201cBut it\u2019s a factor.\u201d<\/span><\/p>\n

Wood believes that the CO2 contribution from groundwater depletion is not our only cause for concern. \u201cIn the 1950s and 1960s, we were always obsessed with finding water. Currently, we are worried about contaminating what we have. We developed the ability to extract groundwater efficiently in the 1920s, and we\u2019ve been pumping it out of the ground ever since. We need to think about economics, societal aspects and local sensitivities with regards to water use. With increasing population needs and local use variations, we need to be good stewards of our aquifers, or we will be in big trouble. People ask me if we could run out of groundwater. Could we run out? It\u2019s unlikely, but yes, it is possible.\u201d<\/span><\/p>\n

Top image:\u00a0Jonathan Butler, student at St. Catherines College, U. of Oxford, UK, visiting upper part of High Plains Aquifer, east of Lubbock, TX. (Credit: Warren Wood)<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Synthesizing years of information about U.S. aquifers in a new way leads to estimate of CO2 emissions from groundwater depletion.<\/p>\n","protected":false},"author":21,"featured_media":27802,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7,8],"tags":[345,140,224,109,73],"class_list":["post-27803","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-atmosphere","category-news","category-newsfeed","tag-earth-atmosphere","tag-groundwater","tag-michigan-state-university","tag-news-ticker","tag-usgs"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"\nGroundwater Depletion Causing Surprising Rise in Atmospheric Carbon Dioxide<\/title>\n<meta name=\"description\" content=\"Synthesizing years of information about U.S. aquifers in a new way leads to estimate of CO2 emissions from groundwater depletion.\" \/>\n<meta name=\"robots\" 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