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AGU journal highlights -- Jan. 28, 2008
Date:1/28/2008

on the subtropic and subpolar regions (10 to 60 degrees latitude), an area well sampled by drifters. They compute the ocean surface cyclonic and anticyclonic motion for scales ranging from large vortices to smaller eddies. The authors find two zonal bands of small-scale motion: one a known wind-induced anticyclonic band at 30 to 40 degrees latitude, and the other an unexpected cyclonic band at 10 to 20 degrees latitude. The latter might be due to fine-scale processes related to salinity front instabilities. These results provide a first global view of the upper ocean through drifter data.

Title: Cyclonic and anticyclonic motion in the upper ocean

Authors: Annalisa Griffa: Instituto de Scienze Marine, Consiglio Nazional delle Ricerche, Pozzuolo di Lerici, Italy; also at Division of Meteorology and Physical Oceanography, Rosentiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida, U.S.A.;

Rick Lumpkin: Physical Oceanography Division, Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, Miami, Florida, U.S.A.;

Milena Veneziani: Ocean Science Department, University of California, Santa Cruz, California, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2007GL032100, 2007; http://dx.doi.org/10.1029/2007GL032100

5. Sea surface stratification caused by global warming is creating shifts in phytoplankton habitat

Many models predict that the rate of ocean overturning will slow as a response to global warming. Recent observations support this, with some showing that oceanic biogeochemical conditions are also changing on decadal scales. To better understand what causes such changes, Watanabe et al. study four 50-year time series of biogeochemical properties from across the northern Pacific Ocean. They find that due to surface stratification caused by
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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