{"id":277,"date":"2015-12-28T02:09:21","date_gmt":"2015-12-28T02:09:21","guid":{"rendered":"http:\/\/192.168.99.100:8080\/award\/carbon-dynamics-in-cool-ridge-flank-hydrothermal-springs-the-dorado-outcrop-of-the-eastern-pacific\/"},"modified":"2019-09-03T12:59:37","modified_gmt":"2019-09-03T19:59:37","slug":"carbon-dynamics-in-cool-ridge-flank-hydrothermal-springs-the-dorado-outcrop-of-the-eastern-pacific","status":"publish","type":"award","link":"https:\/\/www.darkenergybiosphere.org\/award\/carbon-dynamics-in-cool-ridge-flank-hydrothermal-springs-the-dorado-outcrop-of-the-eastern-pacific\/","title":{"rendered":"Carbon dynamics in cool ridge-flank hydrothermal springs: The Dorado Outcrop of the eastern Pacific"},"content":{"rendered":"<p>To assess the chemistry of fluids from the Dorado Outcrop, a cool ridge-flank hydrothermal\u00a0system, we used a variety of techniques including autonomous, time-series samplers\u00a0(OsmoSamplers) and discrete (point) sampling using the DSV <em>Alvin<\/em>. We also collected and\u00a0analyzed pore fluids from a series of short sediment cores in the vicinity of hydrothermal springs\u00a0as well as longer gravity cores from the surrounding region. Concentrations of dissolved inorganic\u00a0carbon are slightly elevated in the hydrothermal fluids relative to bottom seawater, and dissolved\u00a0organic carbon concentrations are generally consistent with the bottom water value to being\u00a0perhaps slightly elevated. Samples for the major nutrients show that silicic acid is significantly\u00a0enriched within the venting fluids relative to the concentration in bottom seawater, whereas\u00a0dissolved phosphate is depleted within these fluids. The \u03b4<sup>13<\/sup>C of the DIC seems to vary with the\u00a0dissolved P concentration from the discrete samples, with with more depleted \u03b4<sup>13<\/sup>C values\u00a0coinciding with lower P concentrations. Pore fluids from short cores collected using DSV Alvin\u00a0are highly variable in their major nutrient concentrations. This variability is likely caused by\u00a0spatial variations in the reactions occurring within the thin sediment package as well as because of\u00a0variable exchange between the pore fluids and the underlying crustal fluids.<\/p>\n<p>Our results suggest that cool, ridge flank hydrothermal systems are a net source of\u00a0inorganic carbon to the oceans and that this carbon has a depleted isotope signature. These systems\u00a0are also a source of silicic acid to the ocean and a net sink for dissolved phosphorus. Based on the\u00a0results from this study as well as that of collaborating scientists, it appears that the reactions that\u00a0produce these chemical signatures likely take place both within the crustal aquifer as well as within\u00a0the overlying sediment package (C.G. Wheat et al., <em>Nature Communications<\/em>, manuscript in\u00a0review).<\/p>\n","protected":false},"template":"","meta":[],"award_type":[11],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/awards\/277"}],"collection":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/awards"}],"about":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/types\/award"}],"wp:attachment":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/media?parent=277"}],"wp:term":[{"taxonomy":"award_type","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/award_type?post=277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}