{"id":816,"date":"2018-06-10T02:02:57","date_gmt":"2018-06-10T02:02:57","guid":{"rendered":"http:\/\/163.180.4.222\/lab\/?p=816"},"modified":"2023-07-05T13:42:19","modified_gmt":"2023-07-05T04:42:19","slug":"background-levels-of-methane-in-mars-atmosphere-show-strong-seasonal-variations","status":"publish","type":"post","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=816","title":{"rendered":"Background levels of methane in Mars\u2019 atmosphere show strong seasonal variations"},"content":{"rendered":"

 <\/p>\n

 <\/p>\n

(\uc6d0\ubb38: \uc5ec\uae30<\/a>\ub97c \ud074\ub9ad\ud558\uc138\uc694~)<\/p>\n

 <\/p>\n

<\/div>\n
\n
\n
\n
\n
\n
\n

Measuring martian organics and methane<\/h2>\n

The Curiosity rover has been sampling on Mars for the past 5 years (see the Perspective by ten Kate). Eigenbrode\u00a0et al.<\/em>\u00a0used two instruments in the SAM (Sample Analysis at Mars) suite to catch traces of complex organics preserved in 3-billion-year-old sediments. Heating the sediments released an array of organics and volatiles reminiscent of organic-rich sedimentary rock found on Earth. Most methane on Earth is produced by biological sources, but numerous abiotic processes have been proposed to explain martian methane. Webster\u00a0et al.<\/em>\u00a0report atmospheric measurements of methane covering 3 martian years and found that the background level varies with the local seasons. The seasonal variation provides an important clue for determining the origin of martian methane.<\/p>\n

Science<\/em>, this issue p.\u00a01096<\/a>, p.\u00a01093<\/a>; see also p.\u00a01068<\/a><\/p>\n<\/div>\n

\n

<\/h2>\n

<\/h2>\n

Abstract<\/h2>\n

Variable levels of methane in the martian atmosphere have eluded explanation partly because the measurements are not repeatable in time or location. We report in situ measurements at Gale crater made over a 5-year period by the Tunable Laser Spectrometer on the Curiosity rover. The background levels of methane have a mean value 0.41 \u00b1 0.16 parts per billion by volume (ppbv) (95% confidence interval) and exhibit a strong, repeatable seasonal variation (0.24 to 0.65 ppbv). This variation is greater than that predicted from either ultraviolet degradation of impact-delivered organics on the surface or from the annual surface pressure cycle. The large seasonal variation in the background and occurrences of higher temporary spikes (~7 ppbv) are consistent with small localized sources of methane released from martian surface or subsurface reservoirs.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

    (\uc6d0\ubb38: \uc5ec\uae30\ub97c \ud074\ub9ad\ud558\uc138\uc694~)   Measuring martian organics and methane The Curiosity rover has been sampling on Mars for the past 5 years (see(more…)<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[34,36,29,30],"tags":[8,10,3,4],"class_list":["post-816","post","type-post","status-publish","format-standard","hentry","category-lets-do-chemistry","category-lets-do-physics","category-lets-do-science","category-recent-science-news","tag-lets-do-chemistry","tag-lets-do-physics","tag-lets-do-science","tag-recent-science-news"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":3497,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=3497","url_meta":{"origin":816,"position":0},"title":"How many metals to oxidize methane?","author":"biochemistry","date":"May 10, 2019","format":false,"excerpt":"\u00a0 \u00a0 Methane is an important fuel, but there are few direct transformations to partially oxidized products. Bacteria use metalloenzymes to catalyze methane oxidation to methanol, a reaction of industrial interest. Understanding the metal sites that enable this reaction may inspire new biomimetic catalysts. Ross\u00a0et al.\u00a0used spectroscopic measurements to assign\u2026","rel":"","context":"In "Let's Do Biology!"","block_context":{"text":"Let's Do Biology!","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=33"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3811,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=3811","url_meta":{"origin":816,"position":1},"title":"Radiocarbon revolution: the story of an isotope","author":"biochemistry","date":"June 19, 2019","format":false,"excerpt":"\u00a0 \u00a0 Chris Turney applauds a book on carbon-14 and its key applications in archaeology, climatology and oceanography. \u00a0 \u00a0 A human femur, thought to be from medieval times, being sampled for carbon dating.Credit: James King-Holmes\/Science Photo Library Hot Carbon: Carbon-14 and a Revolution in Science\u00a0John F. Marra Columbia University\u2026","rel":"","context":"In "Essays on Science"","block_context":{"text":"Essays on Science","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3245,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=3245","url_meta":{"origin":816,"position":2},"title":"Things we know and don\u2019t know about nanoplastic in the environment","author":"biochemistry","date":"April 8, 2019","format":false,"excerpt":"\u00a0 \u00a0 Fragments of plastic smaller than 1 \u03bcm have raised concerns about the potential risks they pose to the environment. Research will have to answer a number of questions to establish what the realistic risks are. \u00a0 Plastic litter in marine environments was first observed in the 1970s1,2. Since\u2026","rel":"","context":"In "Essays on Science"","block_context":{"text":"Essays on Science","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2241,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=2241","url_meta":{"origin":816,"position":3},"title":"Touchdown! Mars InSight lander reaches red planet","author":"biochemistry","date":"December 3, 2018","format":false,"excerpt":"\u00a0 \u00a0 Joint US-French-German mission will be the first dedicated to listening for seismic energy rippling through Mars. \u00a0 A NASA illustration shows the Mars InSight lander preparing to touch down.\u00a0Credit: NASA\/JPL-Caltech \u00a0 NASA\u2019s InSight spacecraft \u2014 the first geophysical observatory ever sent to Mars \u2014 touched down safely on\u2026","rel":"","context":"In "Let's Do Physics!"","block_context":{"text":"Let's Do Physics!","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=36"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2666,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=2666","url_meta":{"origin":816,"position":4},"title":"Low-power organic transistors","author":"biochemistry","date":"February 15, 2019","format":false,"excerpt":"\u00a0 \u00a0 For internet-of-things applications, transistors that deliver high signal amplification (high gain) at low power will help conserve power and extend battery life. Jiang\u00a0et al.\u00a0used inkjet printing to fabricate an organic transistor in which silver metal contacts form a low Schottky barrier (less than 0.2 electron volt) with an\u2026","rel":"","context":"In "Let's Do Chemistry!"","block_context":{"text":"Let's Do Chemistry!","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=34"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3437,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=3437","url_meta":{"origin":816,"position":5},"title":"The new physics needed to probe the origins of life","author":"biochemistry","date":"May 3, 2019","format":false,"excerpt":"\u00a0 \u00a0 Stuart Kauffman\u2019s provocative take on emergence and evolution energizes Sara Imari Walker. \u00a0 An artist\u2019s impression of early \u2018protocells\u2019 proliferating.Credit: Henning Dalhoff\/Science Photo Library \u00a0 \u00a0 A World Beyond Physics: The Emergence and Evolution of Life\u00a0Stuart A. Kauffman\u00a0Oxford University Press (2019) \u00a0 \u00a0 Among the great scientific puzzles\u2026","rel":"","context":"In "'05. \ubb3c\uc9c8\uc758 \uc9c4\ud654' \uad00\ub828"","block_context":{"text":"'05. \ubb3c\uc9c8\uc758 \uc9c4\ud654' \uad00\ub828","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=41"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":false,"jetpack_shortlink":"https:\/\/wp.me\/p9Xo1j-da","_links":{"self":[{"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=\/wp\/v2\/posts\/816","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=816"}],"version-history":[{"count":1,"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=\/wp\/v2\/posts\/816\/revisions"}],"predecessor-version":[{"id":5550,"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=\/wp\/v2\/posts\/816\/revisions\/5550"}],"wp:attachment":[{"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=816"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=816"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/biochemistry.khu.ac.kr\/lab\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=816"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}