Anticorrelated multidecadal variations between surface and subsurface tropical North Atlantic

Details Anticorrelated multidecadal variations between surface and subsurface tropical North Atlantic Anticorrelated multidecadal variations between surface and subsurface tropical North Atlantic

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3412713z&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 12, CiteID L12713

Physics

19

Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Climate Dynamics (0429, 3309), Global Change: Global Climate Models (3337, 4928), Oceanography: Physical: Decadal Ocean Variability (1616, 1635, 3305, 4215), Paleoceanography: Thermohaline

Scientific paper

In this paper for the first time I show that the multidecadal variations of observed tropical North Atlantic (TNA) sea surface temperature (SST) are strongly anticorrelated with those of the observed TNA subsurface ocean temperature, with long-term trends removed. I further show that the anticorrelated change between the TNA surface and subsurface temperature is a distinctive signature of the Atlantic meridional overturning circulation (AMOC) variations, using water-hosing experiments with the GFDL state-of-art coupled climate model (CM2.1). External radiative forced simulations with the same model do not provide a significant relationship between the TNA surface and subsurface temperature variations. The observed detrended multidecadal TNA subsurface temperature anomaly may be taken as a proxy for the AMOC variability. Various mechanisms proposed for the multidecadal TNA SST variations, which are crucial for multidecadal variations of Atlantic hurricane activities, should take into account the observed anticorrelation between the TNA surface and subsurface temperature variations.

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