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AGU journal highlights -- Sept. 6, 2007
Date:9/10/2007

e. So, knowing the abundance of atmospheric hydrogen chloride is important to monitoring ozone depletion and ozone recovery following restrictions imposed by the Montreal Protocol, a treaty established in 1987 that sets timetables for phasing out chemicals that contribute to ozone destruction. Wallace and Livingston analyze data on atmospheric hydrogen chloride collected since 1971 by observers at the McMath-Pierce Solar Telescope on Arizona's Kitt Peak. Their data show the previously well established increase in hydrogen chloride abundance from 1971 to about 1993, thought to be due to unregulated use of chemicals that destroy ozone. These abundances plateau from about 1993 to about 1997. Since 1997, values have steadily decreased, the authors show. They attribute this decrease to the success of the Montreal Protocol.

Title:
The thirty-five year trend of hydrogen chloride amount above Kitt Peak, Arizona

Authors:
L. Wallace: National Optical Astronomy Observatories, Tucson, Arizona, U.S.A.;
W. C. Livingston: National Solar Observatory, Tucson, Arizona, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2007GL030123, 2007, http://dx.doi.org/10.1029/2007GL030123


4. Robotic probes improve global ocean analysis

Observations of the ocean are important to understanding global weather. Although satellites observe the open ocean, the Argo float network, a set of nearly 3000 oceanic robotic probes throughout the Earth's oceans that measure salinity and temperature at depths down to 2 kilometers (1.2 miles), has collected in situ data of the world's oceans since 2001. To analyze the importance of Argo in collecting accurate oceanic information, Balmaseda et al. use the European Centre for Medium-Range Weather Forecasts's operational ocean analysis system to replicate the past 5 years of global ocean behavior with and without Argo observations.
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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