<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">W. Berry Lyons</style></author><author><style face="normal" font="default" size="100%">Bullen, T</style></author><author><style face="normal" font="default" size="100%">Kathleen A. Welch</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Ca isotopic geochemistry of an Antarctic aquatic system</style></title><secondary-title><style face="normal" font="default" size="100%">Geophysical Research Letters</style></secondary-title><short-title><style face="normal" font="default" size="100%">Geophys. Res. Lett.</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2017</style></year><pub-dates><date><style  face="normal" font="default" size="100%">01/2017</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://onlinelibrary.wiley.com/doi/10.1002/2016GL071169/full</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">44</style></volume><pages><style face="normal" font="default" size="100%">882 - 891</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;The McMurdo Dry Valleys, Antarctica, are a polar desert ecosystem. The hydrologic system of the dry valleys is linked to climate with ephemeral streams that &lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: &amp;quot;AdvTTe45e47d2+fb&amp;quot;;&quot;&gt;fl&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;ow from glacial melt during the austral summer. Past climate variations have strongly in&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: &amp;quot;AdvTTe45e47d2+fb&amp;quot;;&quot;&gt;fl&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;uenced the closed-basin, chemically strati&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: &amp;quot;AdvTTe45e47d2+fb&amp;quot;;&quot;&gt;fi&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;ed lakes on the valley &lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: &amp;quot;AdvTTe45e47d2+fb&amp;quot;;&quot;&gt;fl&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;oor. Results of previous work point to important roles for both in-stream processes (e.g., mineral weathering, precipitation and dissolution of salts) and in-lake processes (e.g., mixing with paleo-seawater and calcite precipitation) in determining the geochemistry of these lakes. These processes have a signi&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: &amp;quot;AdvTTe45e47d2+fb&amp;quot;;&quot;&gt;fi&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;cant in&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: &amp;quot;AdvTTe45e47d2+fb&amp;quot;;&quot;&gt;fl&lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;uence on calcium (Ca) biogeochemistry in this aquatic ecosystem, and thus variations in Ca stable isotope compositions of the waters can aid in validating the importance of these processes. We have analyzed the Ca stable isotope compositions of streams and lakes in the McMurdo Dry Valleys. The results validate the important roles of weathering of aluminosilicate minerals and/or CaCO&lt;/span&gt;&lt;span style=&quot;font-size: 7pt; font-family: AdvTTe45e47d2; vertical-align: -2pt;&quot;&gt;3 &lt;/span&gt;&lt;span style=&quot;font-size: 9pt; font-family: AdvTTe45e47d2;&quot;&gt;in the hyporheic zone of the streams, and mixing of lake surface water with paleo-seawater and precipitation of Ca-salts during cryo-concentration events to form the deep lake waters. The lakes in the McMurdo Dry Valleys evolved following different geochemical pathways, evidenced by their unique, nonsystematic Ca isotope signatures.&amp;nbsp;&lt;/span&gt;&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Yang, Ningfang</style></author><author><style face="normal" font="default" size="100%">Kathleen A. Welch</style></author><author><style face="normal" font="default" size="100%">Mohajerin, T. Jade</style></author><author><style face="normal" font="default" size="100%">Telfeyan, Katherine</style></author><author><style face="normal" font="default" size="100%">Chevis, Darren A.</style></author><author><style face="normal" font="default" size="100%">Grimm, Deborah A.</style></author><author><style face="normal" font="default" size="100%">W. Berry Lyons</style></author><author><style face="normal" font="default" size="100%">White, Christopher D.</style></author><author><style face="normal" font="default" size="100%">Johannesson, Karen H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Comparison of arsenic and molybdenum geochemistry in meromictic lakes of the McMurdo Dry Valleys, Antarctica: Implications for oxyanion-forming trace element behavior in permanently stratified lakes</style></title><secondary-title><style face="normal" font="default" size="100%">Chemical Geology</style></secondary-title><short-title><style face="normal" font="default" size="100%">Chemical Geology</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2015</style></year><pub-dates><date><style  face="normal" font="default" size="100%">05/2015</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://linkinghub.elsevier.com/retrieve/pii/S0009254115001874http://api.elsevier.com/content/article/PII:S0009254115001874?httpAccept=text/xmlhttp://api.elsevier.com/content/article/PII:S0009254115001874?httpAccept=text/plain</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">404</style></volume><pages><style face="normal" font="default" size="100%">110 - 125</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;Water samples were collected for arsenic (As) and molybdenum (Mo) analysis from different depths in Lakes Hoare and Fryxell, both of which are located in the Taylor Valley within the McMurdo Dry Valleys of Antarctica. Sampling depths within each lake were chosen to capture variations in As and Mo concentrations and As speciation in the oxic mixolimnia and anoxic monimolimnia of these meromictic lakes. Arsenic concentrations ranged from 0.67&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;to 3.54&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;in Lake Hoare and from 1.69&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;to 17.5&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;in Lake Fryxell. Molybdenum concentrations varied between 5.05&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;and 43&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;in Lake Hoare, and between 3.52&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;and 25.5&amp;nbsp;nmol&amp;nbsp;kg&lt;/span&gt;&lt;sup style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;&amp;minus;&amp;nbsp;1&lt;/sup&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;&amp;nbsp;in Lake Fryxell. Concentrations of As and Mo generally increased with depth in the mixolimnion of each lake, consistent with uptake near the ice&amp;ndash;water interface by organic particles and/or Fe/Mn oxides/oxyhydroxides, followed by gravitational settling and regeneration/remineralization at depth in the vicinity of the redoxcline. Arsenic concentrations either remained constant (Hoare) or increased with depth (Fryxell) in the anoxic monimolimnia, whereas Mo exhibited dramatic decreases in concentrations across the redoxcline in both lakes. Geochemical modeling predicts that As and Mo occur as thioanions in the anoxic bottom waters of Lakes Hoare and Fryxell, and further that the contrasting behavior of both trace elements reflects the respective reactivity of their thioanions towards Fe-sulfide minerals such as mackinawite (FeS) and/or pyrite (FeS&lt;/span&gt;&lt;sub style=&quot;font-size: 0.75em; font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; line-height: 0; color: rgb(46, 46, 46); word-spacing: -1.24453127384186px;&quot;&gt;2&lt;/sub&gt;&lt;span style=&quot;color: rgb(46, 46, 46); font-family: Arial, Helvetica, 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', STIXGeneral, 'Cambria Math', 'Arial Unicode MS', sans-serif; font-size: 16px; line-height: 23.6800003051758px; word-spacing: -1.24453127384186px;&quot;&gt;). More specifically, the geochemical model suggests that Fe-sulfide mineral precipitation in the anoxic monimolimnia of both lakes regulates dissolved sulfide concentrations at levels that are too low for As-sulfide minerals (e.g., orpiment, realgar) to precipitate, whereas mackinawite and/or pyrite react(s) with particle reactive thiomolybdate anions, possibly forming an Fe&amp;ndash;Mo&amp;ndash;S mineral that precipitates and, hence, leads to Mo removal from solution.&lt;/span&gt;&lt;/p&gt;</style></abstract><section><style face="normal" font="default" size="100%">110</style></section></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">W. 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