MURAL - Maynooth University Research Archive Library

    Impact of a 30% reduction in Atlantic meridional overturning during 2009–2010

    Bryden, H.L. and King, Brian A. and McCarthy, Gerard D. and McDonagh, E.L. (2014) Impact of a 30% reduction in Atlantic meridional overturning during 2009–2010. Ocean Science, 10 (4). pp. 683-691. ISSN 1812-0784,

    Download (4MB) | Preview

    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...

    Add this article to your Mendeley library


    The Atlantic meridional overturning circulation comprises warm upper waters flowing northward, becoming colder and denser until they form deep water in the Labrador and Nordic Seas that then returns southward through the North and South Atlantic. The ocean heat transport associated with this circulation is 1.3 PW, accounting for 25% of the maximum combined atmosphere–ocean heat transport necessary to balance the Earth's radiation budget. We have been monitoring the circulation at 25° N since 2004. A 30% slowdown in the circulation for 14 months during 2009–2010 reduced northward ocean heat transport across 25° N by 0.4 PW and resulted in colder upper ocean waters north of 25° N and warmer waters south of 25° N. The spatial pattern of upper ocean temperature anomalies helped push the wintertime circulation 2010–2011 into record-low negative NAO (North Atlantic Oscillation) conditions with accompanying severe winter conditions over northwestern Europe. The warmer temperatures south of 25° N contributed to the high intensity hurricane season in summer 2010.

    Item Type: Article
    Keywords: VAriability; 26.5-Degrees-N; North-Atlantic; Circulation; Anomalies; Ocean; Oceanography; Meteorology & Atmospheric Sciences; North Atlantic oscillation; Thermohaline circulation; Climate cycles; Ocean temperature;
    Academic Unit: Faculty of Social Sciences > Geography
    Item ID: 12193
    Identification Number:
    Depositing User: Gerard McCarthy
    Date Deposited: 22 Jan 2020 15:42
    Journal or Publication Title: Ocean Science
    Publisher: European Geosciences Union
    Refereed: Yes

    Repository Staff Only(login required)

    View Item Item control page


    Downloads per month over past year