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A Ut/Ls Ozone Climatology of the Nineteen Seventies Deduced from the Gasp Aircraft Measurement Program : Volume 7, Issue 22 (29/11/2007)

By Schnadt Poberaj, C.

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Book Id: WPLBN0003987678
Format Type: PDF Article :
File Size: Pages 20
Reproduction Date: 2015

Title: A Ut/Ls Ozone Climatology of the Nineteen Seventies Deduced from the Gasp Aircraft Measurement Program : Volume 7, Issue 22 (29/11/2007)  
Author: Schnadt Poberaj, C.
Volume: Vol. 7, Issue 22
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Thouret, V., Brunner, D., Staehelin, J., Poberaj, C. S., & Mohnen, V. (2007). A Ut/Ls Ozone Climatology of the Nineteen Seventies Deduced from the Gasp Aircraft Measurement Program : Volume 7, Issue 22 (29/11/2007). Retrieved from

Description: Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland. We present ozone measurements of the Global Atmospheric Sampling Program (GASP) performed from four commercial and one research aircraft in the late 1970s. The GASP quality assurance and control program was reviewed, and an ozone climatology of the upper troposphere and lower stratosphere (UT/LS) of the years 1975–1979 was built. The data set was estimated to have an overall uncertainty of 9% or 3 ppb whichever is greater for the first two years and 4% or 3 ppb for the remaining years, i.e. after implementation of silicone rubber membranes in the pumps. Two cases of nearly coincident flights of two GASP airliners along the same flight route, and the comparison with independent observations from the literature, including ozonesondes and aircraft campaigns, indicate that the ozone measurements are of high quality. The UT/LS climatology of the GASP data set is in general agreement with that derived from MOZAIC in the 1990s in regions covered by both programmes. GASP provides unique large-scale climatological information on UT/LS ozone above the northern hemisphere Pacific region, which is not covered by MOZAIC. There, the GASP climatology confirms several characteristic features derived from individual research aircraft campaigns and from ozone soundings. In particular, summertime ozone in the UT over the midlatitude eastern Pacific Ocean was significantly lower in the 1970s than over the American continent. The generally lower ozone concentrations in the tropics near the dateline as compared to farther east are indicative of convective uplifting of ozone poor air from the marine boundary layer.

A UT/LS ozone climatology of the nineteen seventies deduced from the GASP aircraft measurement program

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