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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.08620">arXiv:1710.08620</a> <span> [<a href="https://arxiv.org/pdf/1710.08620">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Earth and Planetary Astrophysics">astro-ph.EP</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.icarus.2017.10.043">10.1016/j.icarus.2017.10.043 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Retrieval of Water Vapor Column Abundance and Aerosol Properties from ChemCam Passive Sky Spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/astro-ph?searchtype=author&query=McConnochie%2C+T+H">Timothy H. McConnochie</a>, <a href="/search/astro-ph?searchtype=author&query=Smith%2C+M+D">Michael D. Smith</a>, <a href="/search/astro-ph?searchtype=author&query=Wolff%2C+M+J">Michael J. Wolff</a>, <a href="/search/astro-ph?searchtype=author&query=Bender%2C+S">Steve Bender</a>, <a href="/search/astro-ph?searchtype=author&query=Lemmon%2C+M">Mark Lemmon</a>, <a href="/search/astro-ph?searchtype=author&query=Wiens%2C+R+C">Roger C. Wiens</a>, <a href="/search/astro-ph?searchtype=author&query=Maurice%2C+S">Sylvestre Maurice</a>, <a href="/search/astro-ph?searchtype=author&query=Gasnault%2C+O">Olivier Gasnault</a>, <a href="/search/astro-ph?searchtype=author&query=Lasue%2C+J">Jeremie Lasue</a>, <a href="/search/astro-ph?searchtype=author&query=Meslin%2C+P">Pierre-Yves Meslin</a>, <a href="/search/astro-ph?searchtype=author&query=Harri%2C+A">Ari-Matti Harri</a>, <a href="/search/astro-ph?searchtype=author&query=Genzer%2C+M">Maria Genzer</a>, <a href="/search/astro-ph?searchtype=author&query=Kemppinen%2C+O">Osku Kemppinen</a>, <a href="/search/astro-ph?searchtype=author&query=Mart%C3%ADnez%2C+G+M">Germ谩n M. Mart铆nez</a>, <a href="/search/astro-ph?searchtype=author&query=DeFlores%2C+L">Lauren DeFlores</a>, <a href="/search/astro-ph?searchtype=author&query=Blaney%2C+D">Diana Blaney</a>, <a href="/search/astro-ph?searchtype=author&query=Johnson%2C+J+R">Jeffrey R. Johnson</a>, <a href="/search/astro-ph?searchtype=author&query=Bell%2C+J+F">James F. Bell III</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.08620v2-abstract-short" style="display: inline;"> We derive water vapor column abundances and aerosol properties from Mars Science Laboratory (MSL) ChemCam passive mode observations of scattered sky light. Each ChemCam passive sky observation acquires spectra at two different elevation angles. We fit these spectra with a discrete-ordinates multiple scattering radiative transfer model, using the correlated-k approximation for gas absorption band… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.08620v2-abstract-full').style.display = 'inline'; document.getElementById('1710.08620v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.08620v2-abstract-full" style="display: none;"> We derive water vapor column abundances and aerosol properties from Mars Science Laboratory (MSL) ChemCam passive mode observations of scattered sky light. Each ChemCam passive sky observation acquires spectra at two different elevation angles. We fit these spectra with a discrete-ordinates multiple scattering radiative transfer model, using the correlated-k approximation for gas absorption bands. The retrieval proceeds by first fitting the continuum of the ratio of the two elevation angles to solve for aerosol properties, and then fitting the continuum-removed ratio to solve for gas abundances. The final step of the retrieval makes use of the observed CO2 absorptions and the known CO2 abundance to correct the retrieved water vapor abundance for the effects of the vertical distribution of scattering aerosols and to derive an aerosol scale height parameter. The ChemCam-retrieved water abundances show, with only a few exceptions, the same seasonal behavior and the same timing of seasonal minima and maxima as the TES, CRISM, and REMS-H data sets that we compare them to. However ChemCam-retrieved water abundances are generally lower than zonal and regional scale from-orbit water vapor data, while at the same time being significantly larger than pre-dawn REMS-H abundances. Pending further analysis of REMS-H volume mixing ratio uncertainties, the differences between ChemCam and REMS-H pre-dawn mixing ratios appear to be much too large to be explained by large scale circulations and thus they tend to support the hypothesis of substantial diurnal interactions of water vapor with the surface. Our preliminary aerosol results, meanwhile, show the expected seasonal pattern in dust particle size but also indicate a surprising inter-annual increase in water-ice cloud opacities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.08620v2-abstract-full').style.display = 'none'; document.getElementById('1710.08620v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">64 pages with embedded figures; this is the accepted version of the manuscript; the meta-data version of the abstract has been shorted to meet arXiv rules</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 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