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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents



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ID: 675628.0, MPI für Chemie / Publikationen MPI für Chemie
CARIBIC observations of gaseous mercury in the upper troposphere and lower stratosphere
Authors:Slemr, F.; Ebinghaus, R.; Weigelt, A.; Kock, H. H.; Brenninkmeijer, C. A. M.; Schuck, T.; Hermann, M.; Zahn, A.; van Velthoven, P.; Martinsson, B.; Ziereis, H.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:E3s Web of Conferences
Volume:1
Sequence Number of Article:17001
Title of Issue:Proceedings of the 16th International Conference on Heavy Metals in the Environment
Review Status:Internal review
Audience:Not Specified
Abstract / Description:A unique set of gaseous mercury measurements in the upper troposphere and lower stratosphere (UT/LS) has been obtained during the monthly CARIBIC (www. caribic-atmospheric. com) flights since May 2005. The passenger Airbus 340-600 of Lufthansa covered routes to the Far East, North America, India, and the southern hemisphere. The accompanying measurements of CO, O-3, NOy, H2O, aerosols, halocarbons, hydrocarbons, greenhouse gases, and several other parameters as well as backward trajectories enable a detailed analysis of these measurements. Speciation tests have shown that the CARIBIC measurements represent a good approximation of total gaseous mercury (TGM) concentrations. Above the tropopause TGM always decrease with increasing potential vorticity (PV) and O-3 which implies its conversion to particle bound mercury. The observation of the lowest TGM concentrations at the highest particle concentrations in the stratosphere provides further evidence for such conversion. We will show how a seasonally dependent conversion rate could be derived using concomitantly measured SF6 mixing ratios as a timer. Tropospheric mercury data suggest the existence of a decreasing trend in the northern hemisphere whose size is comparable with the trend derived from long- term measurements by ship cruises, at Cape Point (South Africa) and Mace Head (Ireland).
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Chemie
Identifiers:ISI:000326475400138 [ID No:1]
ISSN:2267-1242 [ID No:2]
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