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AGU journal highlights -- March 25, 2009
Date:3/25/2009

tmospheres (JGR-D) paper 10.1029/2008JD010595, 2009; http://dx.doi.org/10.1029/2008JD010595


5. Understanding sea temperature-atmospheric pressure links in North Atlantic

Feedback effects between the ocean and atmosphere are important to understanding the mechanisms affecting climate variations. Previous studies have found that atmospheric anomalies associated with a variation in atmospheric pressure above the North Atlantic Ocean called the North Atlantic Oscillation produce a three-part pattern (tripole) of sea surface temperature anomalies at midlatitudes. Scientists refer to such anomalies as the North Atlantic sea surface temperature tripole, and scientists have debated to what extent the atmosphere responds to these midlatitude sea surface temperature variations. Mochizuki et al. identify oceanic feedback signals poleward of the tropics, taking a new approach based on a model used in four-dimensional variational data assimilation to determine the sensitivity of the model to fluctuations in physical variables. Their results reveal that oceanic thermal feedback beyond the tropics is an important process influencing the North Atlantic Oscillation, providing a better understanding of the factors affecting climate variations in the North Atlantic.

Title: Possible oceanic feedback in the extratropics in relation to the North Atlantic SST tripole

Authors: Takashi Mochizuki, Toshiyuki Awaji, and Nozomi Sugiura: Frontier Research Center for Global Change, JAMSTEC, Yokohama, Japan; Awaji is also at Department of Geophysics, Kyoto University, Kyoto, Japan.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL036781, 2009; http://dx.doi.org/10.1029/2008GL036781


6. New tool differentiates man-made from natural nitrogen-oxide pollution

Nitrogen oxides
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Contact: Maria-Jose Vinas
mjvinas@agu.org
202-777-7530
American Geophysical Union
Source:Eurekalert

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