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  • Articles  (4)
  • Antartica
  • Ethane
  • American Association for the Advancement of Science  (2)
  • American Association for the Advancement of Science (AAAS)  (2)
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  • Articles  (4)
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  • 1
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    Accelerated freshening of Antarctic Bottom Water over the last decade in the Southern Indian Ocean (2017)
    American Association for the Advancement of Science
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Science Advances 3 (2017): e1601426, doi:10.1126/sciadv.1601426.
    Description: Southern Ocean abyssal waters, in contact with the atmosphere at their formation sites around Antarctica, not only bring signals of a changing climate with them as they move around the globe but also contribute to that change through heat uptake and sea level rise. A repeat hydrographic line in the Indian sector of the Southern Ocean, occupied three times in the last two decades (1994, 2007, and, most recently, 2016), reveals that Antarctic Bottom Water (AABW) continues to become fresher (0.004 ± 0.001 kg/g decade−1), warmer (0.06° ± 0.01°C decade−1), and less dense (0.011 ± 0.002 kg/m3 decade−1). The most recent observations in the Australian-Antarctic Basin show a particularly striking acceleration in AABW freshening between 2007 and 2016 (0.008 ± 0.001 kg/g decade−1) compared to the 0.002 ± 0.001 kg/g decade−1 seen between 1994 and 2007. Freshening is, in part, responsible for an overall shift of the mean temperature-salinity curve toward lower densities. The marked freshening may be linked to an abrupt iceberg-glacier collision and calving event that occurred in 2010 on the George V/Adélie Land Coast, the main source region of bottom waters for the Australian-Antarctic Basin. Because AABW is a key component of the global overturning circulation, the persistent decrease in bottom water density and the associated increase in steric height that result from continued warming and freshening have important consequences beyond the Southern Indian Ocean.
    Description: The 2016 I08S cruise and the analysis and science performed at sea, as well as the individual principal investigators were funded through multiple National Oceanic and Atmospheric Administration (NOAA) and NSF grants including NSF grant OCE-1437015. The research for this article was mainly completed at sea. For land-based work, V.V.M. relied on her postdoctoral funding through NSF grant OCE-1435665, and A.M.M. was supported in part by NSF grant OCE-1356630 and NOAA grant NA11OAR4310063.
    Keywords: Salinity ; AABW ; Changes ; Water masses ; T-S properties ; Iceberg ; Calving ; Antartica ; Abyss ; Climate change
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 2
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    Earth's Degassing: A Missing Ethane and Propane Source (2009)
    American Association for the Advancement of Science
    Details
    Publication Date: 2017-04-04
    Description: BREVIA
    Description: Current emission inventories require an additional "unknown" source to balance the global atmospheric budgets of ethane (C2H6). Here, we provide evidence that a substantial part of the missing source can be attributed to natural gas seepage from petroliferous, geothermal, and volcanic areas. Such geologic sources also inject propane (C3H8) into the atmosphere. The analysis of a large data set of methane (CH4), ethane, and propane concentrations in surface gas emissions of 238 sites from different geographic and geologic areas, coupled with published estimates of geomethane emissions, suggests that Earth's degassing accounts for at least 17% and 10% of total ethane and propane emissions, respectively.
    Description: Published
    Description: 478
    Description: 3.8. Geofisica per l'ambiente
    Description: JCR Journal
    Description: reserved
    Keywords: Ethane ; Propane ; Geologic emissions ; Seepage ; 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    The Cassini UVIS stellar probe of the Titan atmosphere (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-05-14
    Description: The Cassini Ultraviolet Imaging Spectrometer (UVIS) observed the extinction of photons from two stars by the atmosphere of Titan during the Titan flyby. Six species were identified and measured: methane, acetylene, ethylene, ethane, diacetylene, and hydrogen cyanide. The observations cover altitudes from 450 to 1600 kilometers above the surface. A mesopause is inferred from extraction of the temperature structure of methane, located at 615 km with a temperature minimum of 114 kelvin. The asymptotic kinetic temperature at the top of the atmosphere determined from this experiment is 151 kelvin. The higher order hydrocarbons and hydrogen cyanide peak sharply in abundance and are undetectable below altitudes ranging from 750 to 600 km, leaving methane as the only identifiable carbonaceous molecule in this experiment below 600 km.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shemansky, Donald E -- Stewart, A Ian F -- West, Robert A -- Esposito, Larry W -- Hallett, Janet T -- Liu, Xianming -- New York, N.Y. -- Science. 2005 May 13;308(5724):978-82.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Aerospace Engineering, University of Southern California, University Park, Los Angeles, CA 90089, USA. dons@hippolyta.usc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15890872" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylene ; Atmosphere ; Ethane ; Ethylenes ; Extraterrestrial Environment ; *Hydrocarbons, Acyclic ; *Hydrogen Cyanide ; Mathematics ; Methane ; *Saturn ; *Spacecraft ; Spectrum Analysis ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Jupiter's atmospheric composition from the Cassini thermal infrared spectroscopy experiment (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-08-21
    Description: The Composite Infrared Spectrometer observed Jupiter in the thermal infrared during the swing-by of the Cassini spacecraft. Results include the detection of two new stratospheric species, the methyl radical and diacetylene, gaseous species present in the north and south auroral infrared hot spots; determination of the variations with latitude of acetylene and ethane, the latter a tracer of atmospheric motion; observations of unexpected spatial distributions of carbon dioxide and hydrogen cyanide, both considered to be products of comet Shoemaker-Levy 9 impacts; characterization of the morphology of the auroral infrared hot spot acetylene emission; and a new evaluation of the energetics of the northern auroral infrared hot spot.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kunde, V G -- Flasar, F M -- Jennings, D E -- Bezard, B -- Strobel, D F -- Conrath, B J -- Nixon, C A -- Bjoraker, G L -- Romani, P N -- Achterberg, R K -- Simon-Miller, A A -- Irwin, P -- Brasunas, J C -- Pearl, J C -- Smith, M D -- Orton, G S -- Gierasch, P J -- Spilker, L J -- Carlson, R C -- Mamoutkine, A A -- Calcutt, S B -- Read, P L -- Taylor, F W -- Fouchet, T -- Parrish, P -- Barucci, A -- Courtin, R -- Coustenis, A -- Gautier, D -- Lellouch, E -- Marten, A -- Prange, R -- Biraud, Y -- Ferrari, C -- Owen, T C -- Abbas, M M -- Samuelson, R E -- Raulin, F -- Ade, P -- Cesarsky, C J -- Grossman, K U -- Coradini, A -- New York, N.Y. -- Science. 2004 Sep 10;305(5690):1582-6. Epub 2004 Aug 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Astronomy, University of Maryland, College Park, MD 20742, USA. Virgil.G.Kunde.1@gsfc.nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15319491" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylene ; Atmosphere ; *Carbon Dioxide ; Ethane ; Extraterrestrial Environment ; *Hydrocarbons ; *Hydrogen Cyanide ; *Jupiter ; Spacecraft ; Spectrum Analysis ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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