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Comma-separated values (.csv) file containing data related to mercury concentrations in dragonfly samples from U.S. National Parks collected as part of the Dragonfly Mercury Project (DMP). First posted - September 14, 2018 Revised - October 18, 2019, ver. 2.0 Revised - February 4, 2020, ver. 3.0 Revised - October 28, 2020, ver. 4.0
Categories: Data, Data Release - Revised; Tags: Acadia National Park, Allegheny Portage Railroad National Historic Site, Apostle Islands National Lakeshore, Appomattox Court House National Historical Park, Battle Creek Cypress Swamp, All tags...
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Degassing thermal features at Yellowstone National Park include spectacular geysers, roiling hot springs, bubbling mud pots, fumaroles, frying pans, and areas of passive degassing characterized by steaming ground. Most of these features are readily identified by visible clouds of steam that are occasionally accompanied by a strong “rotten egg” odor from emissions of hydrogen sulfide gas. Gas compositions typically are greater than 90% carbon dioxide with lesser amounts of helium, hydrogen, hydrogen sulfide, methane, nitrogen and other trace components. The composition of the gas and relative amounts of gas and steam relate both to the type of feature as well as the geographic location within the park. In 2003 we...
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Monitoring the chloride (Cl) flux in the major rivers draining Yellowstone National Park (YNP) provides a holistic view of the thermal output from the underlying magma reservoir, and abrupt fluctuations in the Cl flux may signify changes in hydrothermal activity. The U.S. Geological Survey (USGS) and the National Park Service (NPS) have collaborated on Cl flux monitoring of the major rivers since the 1970s. In the past, researchers collected water samples from the major rivers in YNP, but funding restrictions, winter conditions, and the great distances between sites limited the number of samples collected annually. Beginning in 2010, specific conductance, which is relatively easy to measure and can be automated,...


    map background search result map search result map Chemical and isotopic data on gases and waters for thermal and non-thermal features across Yellowstone National Park, v. 2.0 Total Mercury Concentrations in Dragonfly Larvae from U.S. National Parks Specific conductance data for selected rivers and creeks in Yellowstone National Park, beginning in 2010 (version 2.0, May 2020) Chemical and isotopic data on gases and waters for thermal and non-thermal features across Yellowstone National Park, v. 2.0 Specific conductance data for selected rivers and creeks in Yellowstone National Park, beginning in 2010 (version 2.0, May 2020) Total Mercury Concentrations in Dragonfly Larvae from U.S. National Parks