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AGU journal highlights -- June 15, 2011
Date:6/15/2011

rrence of shorties seems to be related to a different climate parameter. Both of these findings are highly suggestive of data quality problems for the shorties record. The researchers note that their finding does not rule out the possibility of a climate-driven increase in shorties over the twentieth century. Rather, any existing trend will be imperceptible, as it is masked by data quality issues.

Source: Journal of Geophysical Research-Atmospheres, doi:10.1029/2010JD015493, 2011
http://dx.doi.org/10.1029/2010JD015493

Title: Is the recorded increase in short-duration North Atlantic tropical storms spurious?

Authors:

Gabriele Villarini: Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey, USA; and Willis Research Network, London, UK;

James A. Smith: Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey, USA;

Gabriel A. Vecchi and Thomas R. Knutson: Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, New Jersey, USA.


3. Potential for Atlantic current collapse hinted by complex global circulation model

The Atlantic meridional overturning circulation (AMOC) is a gigantic heat, salt, and nutrient mixer that spans the length of the Atlantic Ocean. Drawing warming surface waters up from the south through the Gulf Stream and along the North Atlantic Current, the system has a large amount of control over the climate of western Europe. Once in the North Atlantic the water cools, becoming more dense and sinking to between 3,000 and 5,000 meters (between 1.9 and 3.1 miles) in depth before commencing a return journey south. Both paleoclimate evidence and simplified ocean circulation models suggest that the AMOC may have two stable states (either its current behavior or an "off" mode), and this
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Contact: Maria-Jos Vias
mjvinas@agu.org
202-777-7530
American Geophysical Union
Source:Eurekalert

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