MURAL - Maynooth University Research Archive Library



    Atmosphere drives recent interannual variability of the Atlantic meridional overturning circulation at 26.5°N


    Roberts, C.D. and Waters, J. and Peterson, K.A. and Palmer, M.D. and McCarthy, Gerard D. and Frajka-Williams, Eleanor and Haines, K. and Lea, D.J. and Martin, M.J. and Storkey, D. and Blockley, E.W. and Zuo, H. (2013) Atmosphere drives recent interannual variability of the Atlantic meridional overturning circulation at 26.5°N. Geophysical Research Letters, 40 (19). pp. 5164-5171. ISSN 0094-8276

    [img]
    Preview
    Download (954kB) | Preview


    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...



    Add this article to your Mendeley library


    Abstract

    [1] The Atlantic meridional overturning circulation (AMOC) has been observed at 26.5°N since 2004. During 2009/2010, there was a transient 30% weakening of the AMOC driven by anomalies in geostrophic and Ekman transports. Here, we use simulations based on the Met Office Forecast Ocean Assimilation Model (FOAM) to diagnose the relative importance of atmospheric forcings and internal ocean dynamics in driving the anomalous geostrophic circulation of 2009/2010. Data‐assimilating experiments with FOAM accurately reproduce the mean strength and depth of the AMOC at 26.5°N. In addition, agreement between simulated and observed stream functions in the deep ocean is improved when we calculate the AMOC using a method that approximates the observing array at 26.5°N. The main features of the geostrophic circulation anomaly are captured by an ensemble of simulations without data assimilation. These model results suggest that the atmosphere played a dominant role in driving recent interannual variability of the AMOC.

    Item Type: Article
    Keywords: AMOC; variability; ocean model; data assimilation; ocean circulation; Atlantic meridional overturning circulation;
    Academic Unit: Faculty of Social Sciences > Geography
    Item ID: 12194
    Identification Number: https://doi.org/10.1002/grl.50930
    Depositing User: Gerard McCarthy
    Date Deposited: 22 Jan 2020 15:43
    Journal or Publication Title: Geophysical Research Letters
    Publisher: American Geophysical Union
    Refereed: Yes
    URI:

    Repository Staff Only(login required)

    View Item Item control page

    Downloads

    Downloads per month over past year