title: Observations of Tropospheric and Stratospheric Bromine Monoxide from Satellite : Analysis of Satellite Data derived from GOME for 1996-2001
creator: Hollwedel, Jens C.
subject: 530
subject: 530 Physics
description: Column densities of bromine monoxide have been derived from satellite borne Global Ozone Monitoring Experiment measurements for the time period from 1996 to 2001 on a global scale. This data set has been analyzed under various aspects: two methods two achieve a separation of the stratospheric and tropospheric fractions of the total column density have been developed. The method relying on a fixed solar zenith angle interval has been used to study the evolution of stratospheric BrO abundances. As a result, it has been found in accordance with other measurements that the average stratospheric BrO load has increased during the time period under investigation. Time series of tropospheric column density fractions derived with the other method using a reference site, have been successfully compared to in-situ ozone measurements yielding a reasonably good correlation. Differences between both hemispheres in stratospheric as well as tropospheric BrO have been discussed. The northern hemisphere usually shows higher stratospheric and tropospheric column densities. Sources and source strengths of boundary layer BrO have been investigated. Enhanced tropospheric boundary layer BrO is often released in bromine explosion events during polar spring leading to tropospheric ozone holes. The sea-ice and especially frost flowers are the sources for these events. The area covered by ’clouds’ of enhanced BrO column densities in the northern hemisphere has increased by about 10% per year from 1996 to 2001. This indicates that the source strength has increased which is probably due to changes in the Arctic sea-ice cover. The identification of other sources like volcanoes or salt lakes from this satellite borne instrument has not been successful. Strong evidence for a free tropospheric BrO background has been gathered. It has been estimated that about 2pptv BrO are present in the free troposphere with a lower boundary of its lifetime of about four days. Transport events of polar tropospheric Bro towards mid-latitudes and into the free troposphere have been discovered.
date: 2004
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/5349/1/diss_v1.0.pdf
identifier: DOI:10.11588/heidok.00005349
identifier: urn:nbn:de:bsz:16-opus-53497
identifier:   Hollwedel, Jens C.  (2004) Observations of Tropospheric and Stratospheric Bromine Monoxide from Satellite : Analysis of Satellite Data derived from GOME for 1996-2001.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/5349/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: ger