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Images for distinct areas of permanent shadow within 35 north polar craters were successfully captured during the campaign. All of these regions of permanent shadow were found to have low\u2010reflectance surfaces with well\u2010defined boundaries. Additionally, brightness variations across the deposits correlate with variations in the biannual maximum surface temperature across the permanently shadowed regions, supporting the conclusion that multiple volatile organic compounds are contained in Mercury's polar deposits, in addition to water ice. A recent large impact event or ongoing bombardment by micrometeoroids could deliver water as well as many volatile organic compounds to Mercury. Either scenario is consistent with the distinctive reflectance properties and well\u2010defined boundaries of Mercury's polar deposits and the presence of volatiles in all available cold traps.<\/jats:p>","DOI":"10.1002\/2016gl070403","type":"journal-article","created":{"date-parts":[[2016,8,24]],"date-time":"2016-08-24T02:46:52Z","timestamp":1472006812000},"page":"9461-9468","source":"Crossref","is-referenced-by-count":43,"title":["Imaging Mercury's polar deposits during MESSENGER's low\u2010altitude campaign"],"prefix":"10.1029","volume":"43","author":[{"given":"Nancy L.","family":"Chabot","sequence":"first","affiliation":[{"name":"The Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolyn M.","family":"Ernst","sequence":"additional","affiliation":[{"name":"The Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David A.","family":"Paige","sequence":"additional","affiliation":[{"name":"Department of Earth, Planetary, and Space Sciences University of California  Los Angeles California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hari","family":"Nair","sequence":"additional","affiliation":[{"name":"The Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brett W.","family":"Denevi","sequence":"additional","affiliation":[{"name":"The Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David T.","family":"Blewett","sequence":"additional","affiliation":[{"name":"The Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Scott L.","family":"Murchie","sequence":"additional","affiliation":[{"name":"The Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariel N.","family":"Deutsch","sequence":"additional","affiliation":[{"name":"Department of Earth, Environmental and Planetary Sciences Brown University  Providence Rhode Island USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James W.","family":"Head","sequence":"additional","affiliation":[{"name":"Department of Earth, Environmental and Planetary Sciences Brown University  Providence Rhode Island USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sean C.","family":"Solomon","sequence":"additional","affiliation":[{"name":"Lamont\u2010Doherty Earth Observatory Columbia University  Palisades New York USA"},{"name":"Department of Terrestrial Magnetism Carnegie Institution of Washington  Washington District of Columbia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"13","published-online":{"date-parts":[[2016,9,17]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2009.10.009"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1051\/0004-6361\/200912080"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2015.09.032"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1020139302770"},{"key":"e_1_2_6_6_1","article-title":"Impact delivery of water at the Moon and Mercury","volume":"46","author":"Bruck Syal M.","year":"2015","journal-title":"Lunar Planet. 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