AGU journal highlights -- Oct. 16, 2008(pospheric ozone columns (from 0 to 6 kil...)

Date:10/16/2008

pospheric ozone columns (from 0 to 6 kilometers (3.7 miles) in altitude) over Europe during the heat wave of July 2007. Comparing the results with selected balloonsonde measurements of ozone shows excellent agreement. Further, the ozone concentrations from IASI match well the predictions of a regional chemistry-transport model. This study demonstrates the capability of infrared satellite observations to monitor tropospheric ozone and to improve the forecasts of air quality and climate models.

Title: Tropospheric ozone distributions over Europe during the heat wave in July 2007 observed form infrared nadir spectra recorded by IASI

Authors: M. Eremenko, G. Dufour, G. Foret, C. Keim, J. Orphal, M. Beekmann, G. Bergametti, and J.-M. Flaud: Laboratoire Interuniversitaire des Systmes Atmosphriques, Universit Paris-Est and Universit Denis Diderot, CNRS, Crteil, France.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL034803, 2008; http://dx.doi.org/10.1029/2008GL034803

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7. Nordic currents shaped by topography

Surveys of the Nordic seas spanning more than 100 years reveal that warm waters from the North Atlantic flow along the eastern margin of the Nordic seas while cold waters from the Arctic flow south along the east coast of Greenland. However, how deep water circulates within these basins is not well known. Noting that the shape of the ocean bottom significantly constrains fluid motion in weakly stratified deep waters, Siland et al. study the positions of neutrally buoyant subsurface drifting floats that were deployed across the northern slope of the IcelandFaroe Ridge at a depth of 800 meters (2600 feet). They find that movement of the floats was tightly controlled by topography such that flow of intermediate waters within and the exchange between the basins took place along depth contours. By contrast, just upstream of the outflow
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Contact: Peter Weiss pweiss@agu.org 202-777-7507 American Geophysical Union Source:Eurekalert

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