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    Warming of Global Abyssal and Deep Southern Ocean Waters between the 1990s and 2000s: Contributions to Global Heat and Sea Level Rise Budgets

    Source: Journal of Climate:;2010:;volume( 023 ):;issue: 023::page 6336
    Author:
    Purkey, Sarah G.
    ,
    Johnson, Gregory C.
    DOI: 10.1175/2010JCLI3682.1
    Publisher: American Meteorological Society
    Abstract: Abyssal global and deep Southern Ocean temperature trends are quantified between the 1990s and 2000s to assess the role of recent warming of these regions in global heat and sea level budgets. The authors 1) compute warming rates with uncertainties along 28 full-depth, high-quality hydrographic sections that have been occupied two or more times between 1980 and 2010; 2) divide the global ocean into 32 basins, defined by the topography and climatological ocean bottom temperatures; and then 3) estimate temperature trends in the 24 sampled basins. The three southernmost basins show a strong statistically significant abyssal warming trend, with that warming signal weakening to the north in the central Pacific, western Atlantic, and eastern Indian Oceans. Eastern Atlantic and western Indian Ocean basins show statistically insignificant abyssal cooling trends. Excepting the Arctic Ocean and Nordic seas, the rate of abyssal (below 4000 m) global ocean heat content change in the 1990s and 2000s is equivalent to a heat flux of 0.027 (±0.009) W m?2 applied over the entire surface of the earth. Deep (1000?4000 m) warming south of the Subantarctic Front of the Antarctic Circumpolar Current adds 0.068 (±0.062) W m?2. The abyssal warming produces a 0.053 (±0.017) mm yr?1 increase in global average sea level and the deep warming south of the Subantarctic Front adds another 0.093 (±0.081) mm yr?1. Thus, warming in these regions, ventilated primarily by Antarctic Bottom Water, accounts for a statistically significant fraction of the present global energy and sea level budgets.
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      Warming of Global Abyssal and Deep Southern Ocean Waters between the 1990s and 2000s: Contributions to Global Heat and Sea Level Rise Budgets

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4212455
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    contributor authorPurkey, Sarah G.
    contributor authorJohnson, Gregory C.
    date accessioned2017-06-09T16:35:51Z
    date available2017-06-09T16:35:51Z
    date copyright2010/12/01
    date issued2010
    identifier issn0894-8755
    identifier otherams-70651.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212455
    description abstractAbyssal global and deep Southern Ocean temperature trends are quantified between the 1990s and 2000s to assess the role of recent warming of these regions in global heat and sea level budgets. The authors 1) compute warming rates with uncertainties along 28 full-depth, high-quality hydrographic sections that have been occupied two or more times between 1980 and 2010; 2) divide the global ocean into 32 basins, defined by the topography and climatological ocean bottom temperatures; and then 3) estimate temperature trends in the 24 sampled basins. The three southernmost basins show a strong statistically significant abyssal warming trend, with that warming signal weakening to the north in the central Pacific, western Atlantic, and eastern Indian Oceans. Eastern Atlantic and western Indian Ocean basins show statistically insignificant abyssal cooling trends. Excepting the Arctic Ocean and Nordic seas, the rate of abyssal (below 4000 m) global ocean heat content change in the 1990s and 2000s is equivalent to a heat flux of 0.027 (±0.009) W m?2 applied over the entire surface of the earth. Deep (1000?4000 m) warming south of the Subantarctic Front of the Antarctic Circumpolar Current adds 0.068 (±0.062) W m?2. The abyssal warming produces a 0.053 (±0.017) mm yr?1 increase in global average sea level and the deep warming south of the Subantarctic Front adds another 0.093 (±0.081) mm yr?1. Thus, warming in these regions, ventilated primarily by Antarctic Bottom Water, accounts for a statistically significant fraction of the present global energy and sea level budgets.
    publisherAmerican Meteorological Society
    titleWarming of Global Abyssal and Deep Southern Ocean Waters between the 1990s and 2000s: Contributions to Global Heat and Sea Level Rise Budgets
    typeJournal Paper
    journal volume23
    journal issue23
    journal titleJournal of Climate
    identifier doi10.1175/2010JCLI3682.1
    journal fristpage6336
    journal lastpage6351
    treeJournal of Climate:;2010:;volume( 023 ):;issue: 023
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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