{"id":283697,"date":"2021-06-25T14:10:20","date_gmt":"2021-06-25T11:10:20","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/new-study-offers-clues-about-how-mars-lost-its-water\/"},"modified":"2021-06-25T14:10:20","modified_gmt":"2021-06-25T11:10:20","slug":"new-study-offers-clues-about-how-mars-lost-its-water","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/new-study-offers-clues-about-how-mars-lost-its-water\/","title":{"rendered":"#New study offers clues about how Mars lost its water"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6af244a7c2c24\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #dd3333;color:#dd3333\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #dd3333;color:#dd3333\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6af244a7c2c24\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/buradabiliyorum.com\/en\/new-study-offers-clues-about-how-mars-lost-its-water\/#Water_escapes_from_the_Martian_atmosphere\" >Water escapes from the Martian atmosphere<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/buradabiliyorum.com\/en\/new-study-offers-clues-about-how-mars-lost-its-water\/#New_data\" >New data<\/a><\/li><\/ul><\/nav><\/div>\n<p>&#8220;<strong>#New study offers clues about how Mars lost its water<\/strong>&#8221;<\/p>\n<div>Mars is known for its thin atmosphere, where CO<sub>2<\/sub> dominates and provides most of the atmospheric mass and pressure. In fact, the pressure is similar to that in the Earth\u2019s stratosphere, which is a layer of the atmosphere, at more than 30km above the surface.<\/p>\n<p>But what about water? Water on Mars <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/doi.org\/10.1017\/9781139060172.011\">is currently found on the surface<\/a> as a layer of ice \u2013 several kilometers thick \u2013 at the north pole. It also <a href=\"https:\/\/buradabiliyorum.com\/en\/category\/download-scripts-themes-apps\/\" data-internallinksmanager029f6b8e52c=\"9\" title=\"Download Scripts &amp; Themes &amp; Apps\" target=\"_blank\" rel=\"noopener\">app<\/a>ears as seasonal frost at the coldest times of the year, and in the atmosphere as vapor and ice. Nevertheless, the Martian atmosphere is extremely dry compared to Earth\u2019s, with about 100\u00a0times less water. While precipitation on Earth results in water layers several centimeters thick, water that would precipitate on Mars would only form a thin film of less than a millimeter.<\/p>\n<p><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.nature.com\/articles\/s41550-021-01389-x\">New data<\/a> now provides a better understanding of why there is (almost) no water left on Mars.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Water_escapes_from_the_Martian_atmosphere\"><\/span>Water escapes from the Martian atmosphere<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The evidence suggests that Mars was not always the cold, arid planet we observe today. There is plenty of evidence of water on Mars\u2019s surface in the distant past \u2013 about four billion years ago. At that time, liquid water flowed in great streams and stagnated in the form of pools or lakes, such as in the Jezero crater explored by the Perseverance rover, in search of traces of past life.<\/p>\n<figure class=\"align-center \">\n<p><figure class=\"post-image post-mediaBleed aligncenter\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" width=\"600\" height=\"338\" class=\"js-lazy\" src=\"https:\/\/images.theconversation.com\/files\/407950\/original\/file-20210623-13-11l6fkx.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\"\/><figcaption><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/thenextweb.com\/news\/#\" data-url=\"https:\/\/twitter.com\/intent\/tweet?url=https%3A%2F%2Feditorial.thenextweb.com%2Fspace%2F2021%2F06%2F25%2Fnew-study-clues-mars-lost-water-syndication%2F&amp;via=thenextweb&amp;related=thenextweb&amp;text=Check out this picture on: Jezero Crater, where Perseverance landed in February\u00a02021, was a lake in the distant past. NASA\/JPL-Caltech\" data-title=\"Share Jezero Crater, where Perseverance landed in February\u00a02021, was a lake in the distant past. NASA\/JPL-Caltech on Twitter\" data-width=\"685\" data-height=\"500\" class=\"post-image-share popitup\" title=\"Share Jezero Crater, where Perseverance landed in February\u00a02021, was a lake in the distant past. NASA\/JPL-Caltech on Twitter\"><i class=\"icon icon--inline icon--twitter--dark\"\/><\/a>Jezero Crater, where Perseverance landed in February\u00a02021, was a lake in the distant past. <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.nasa.gov\/image-feature\/jezero-crater-was-a-lake-in-mars-ancient-past\">NASA\/JPL-Caltech<\/a><\/figcaption><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/407950\/original\/file-20210623-13-11l6fkx.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" alt=\"\" width=\"600\" height=\"338\" class=\"\" srcset=\"\"\/><\/noscript><\/figure><figcaption\/><\/p>\n<\/figure>\n<p>For liquid water to circulate and reside on the surface long enough to leave these marks, there must have been a radically different climate than the one we see today. Mars, Earth, and Venus probably formed from the gradual accumulation of the same basic materials, which means that they must have had great similarities early in their history. But while Earth and Venus have retained most of their thick atmosphere, Mars, because of its small size and low gravity, has lost most of its atmosphere.<\/p>\n<p>It is indeed this <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/doi.org\/10.1016\/j.icarus.2018.05.030\">\u201closs of gas to space\u201d<\/a> that helps explain the current tenuousness of Mars\u2019 atmosphere. This loss occurs very high in the atmosphere, above 200km, where molecules have already broken down into atoms and where the lightest ones, such as hydrogen, can be torn away from the weak gravity of Mars. Exposed to the energetic particles of the solar wind, Mars\u2019 exosphere (the upper layer of the atmosphere) has allowed the equivalent of hundreds of present-day atmospheres to be lost to space.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"New_data\"><\/span>New data<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>New data from the ESA\u2019s <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/exploration.esa.int\/web\/mars\/-\/46475-trace-gas-orbiter\">Trace Gas Orbiter mission<\/a>, published <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.nature.com\/articles\/s41550-021-01389-x\">in the journal Nature Astronomy<\/a>, has shed light on the subtle mechanisms behind the loss of water to space.<\/p>\n<p>Martian water has a very specific chemical composition. There are different \u201cisotopes\u201d of water \u2013 in the semi-heavy water HDO, a hydrogen atom can be replaced by an atom of deuterium (D). (This is twice as heavy as hydrogen because it has a particle called a neutron in addition to the proton in its nucleus.) Measurements stretching back to the 1980s reveal that water on Mars has a relative concentration of deuterium six times greater than that on Earth. This is interpreted as the result of the loss of hydrogen, gradually leaving behind the heavier isotopes.<\/p>\n<p>By extrapolation, the initial amount of water on Mars must have been at least six times greater than it is now, equivalent to a liquid layer of about 100 meters thick covering the planet. This shows how crucial the semi-heavy water ratio is to understand Mars\u2019 youth and to shed light on the hypothesis that it once had a warm and wet climate, a prerequisite for habitability.<\/p>\n<p>These results from the Trace Gas Orbiter tell us how water and semi-heavy water in the lower atmosphere reach the upper atmosphere and break down into atoms that can escape to space. In particular, it tells us more about the inter<a href=\"https:\/\/buradabiliyorum.com\/en\/category\/social-mediaa\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Social Media\" target=\"_blank\" rel=\"noopener\">media<\/a>te processes by which hydrogen and deuterium enter the exosphere.<\/p>\n<p>For the past 20\u00a0years, two theories have suggested that hydrogen and deuterium cannot reach the exosphere in the proportions they do in lower atmospheric water molecules. The intermediate processes that could enable it, however, are condensation (water vapor turning into liquid water), which forms Martian water-ice clouds, and photolysis, which breaks up the water molecule and releases a hydrogen or deuterium atom under the action of UV light.<\/p>\n<p>What <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.nature.com\/articles\/s41550-021-01389-x\">our recent study<\/a> reveals is that condensation plays a minor role in the deuterium content of the exosphere. Thanks to the Trace Gas Orbiter\u2019s Atmospheric Chemistry Suite instrument and its simultaneous measurements of H<sub>2<\/sub>0 and HDO, we were able to show where the hydrogen and deuterium atoms come from. That\u2019s particularly important given that it is at an altitude and time of year on Mars where condensation has no opportunity to interfere with photolysis.<\/p>\n<p>It turns out that photolysis is the dominating process: it produces the bulk of the atoms and dictates the isotopic fractionation of the hydrogen atoms that escape from the Martian upper atmosphere.<\/p>\n<p>This new understanding of the processes that lead to the loss of water to space is a key milestone in attempts to trace the history of water on Mars. Only the Trace Gas Orbiter satellite can reveal the joint concentrations of H<sub>2<\/sub>0 and HDO. But <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/mars.nasa.gov\/maven\/\">the NASA satellite MAVEN<\/a> is able to observe and characterize hydrogen and deuterium populations in the exosphere.<\/p>\n<p>The concomitance of these two missions is bringing to life a new line of research. It may allow scientists to describe the complete path of water on Mars \u2013 from the lower atmosphere to the very upper atmosphere and into space. Only a detailed understanding of this pathway will allow scientists to develop reliable scenarios for the history of water over the last few billion years, and to corroborate the past habitability of Mars.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img loading=\"lazy\" decoding=\"async\" style=\"border: none !important;margin: 0 !important;max-height: 1px !important;max-width: 1px !important;min-height: 1px !important;min-width: 1px !important;padding: 0 !important\" alt=\"The Conversation\" width=\"1\" height=\"1\" class=\"js-lazy\" src=\"https:\/\/counter.theconversation.com\/content\/163333\/count.gif?distributor=republish-lightbox-basic\"\/><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https:\/\/theconversation.com\/republishing-guidelines --><\/p>\n<p><noscript><img loading=\"lazy\" decoding=\"async\" style=\"border: none !important;margin: 0 !important;max-height: 1px !important;max-width: 1px !important;min-height: 1px !important;min-width: 1px !important;padding: 0 !important\" src=\"https:\/\/counter.theconversation.com\/content\/163333\/count.gif?distributor=republish-lightbox-basic\" alt=\"The Conversation\" width=\"1\" height=\"1\" class=\"\" srcset=\"\"\/><\/noscript><\/p>\n<p><em>Article by <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/theconversation.com\/profiles\/franck-montmessin-1159515\">Franck Montmessin<\/a>, Directeur de recherche CNRS au Laboratoire Atmosph\u00e8res, Milieux, Observations Spatiales (LATMOS), <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/theconversation.com\/institutions\/universite-de-versailles-saint-quentin-en-yvelines-uvsq-universite-paris-saclay-2271\">Universit\u00e9 de Versailles Saint-Quentin-en-Yvelines (UVSQ) \u2013 Universit\u00e9 Paris-Saclay <\/a><\/em><\/p>\n<p><em>This article is republished from <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/theconversation.com\">The Conversation<\/a> under a Creative Commons license. Read the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/theconversation.com\/why-is-there-so-little-water-left-on-mars-163333\">original article<\/a>.<\/em><\/p>\n<\/div>\n<p><script async src=\"\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<blockquote><p><strong><span style=\"color: #ff6600;\">If you liked the article, do not forget to share it with your friends. 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In fact, the pressure is similar to that in the Earth\u2019s stratosphere, which is a layer of the atmosphere, at more than 30km above the surface&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":283698,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/img-cdn.tnwcdn.com\/image\/tnw?filter_last=1&fit=1280,640&url=https:\/\/cdn0.tnwcdn.com\/wp-content\/blogs.dir\/1\/files\/2021\/06\/Mars.jpg&signature=62b60874ea2d2c427abd0b12ac429453","fifu_image_alt":"","footnotes":""},"categories":[18],"tags":[],"class_list":["post-283697","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/283697","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=283697"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/283697\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media\/283698"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=283697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=283697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=283697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}