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CARIBIC observations of gaseous mercury in the upper troposphere and lower stratosphere

Slemr, F.; Ebinghaus, R.; Weigelt, A.; Kock, H. H.; Brenninkmeijer, C. A.M.; Schuck, T.; Hermann, M.; Zahn, A.; Van Velthoven, P. and Martinsson, B. LU , et al. (2013) 16th International Conference on Heavy Metals in the Environment, ICHMET 2012 In E3S Web of Conferences 1.
Abstract

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, O3, 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... (More)

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, O3, 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 O3 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).

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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Distribution, Heavy metals, Measurement, Mercury, Stratosphere, Trend, Troposphere
host publication
Proceedings of the 16th International Conference on Heavy Metals in the Environment
series title
E3S Web of Conferences
volume
1
publisher
EDP Sciences
conference name
16th International Conference on Heavy Metals in the Environment, ICHMET 2012
conference location
Rome, Italy
conference dates
2013-09-23 - 2013-09-27
external identifiers
  • scopus:85016488325
ISSN
2100-014X
DOI
10.1051/e3sconf/20130117001
language
English
LU publication?
yes
id
de6449f6-3da7-4c32-b7ba-30236927b107
date added to LUP
2019-05-16 09:25:58
date last changed
2019-05-22 12:22:32
@inproceedings{de6449f6-3da7-4c32-b7ba-30236927b107,
  abstract     = {<p>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, O3, 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 O3 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).</p>},
  author       = {Slemr, F. and Ebinghaus, R. and Weigelt, A. and Kock, H. H. and Brenninkmeijer, C. A.M. and Schuck, T. and Hermann, M. and Zahn, A. and Van Velthoven, P. and Martinsson, B. and Ziereis, H.},
  booktitle    = {E3S Web of Conferences},
  issn         = {2100-014X},
  keyword      = {Distribution,Heavy metals,Measurement,Mercury,Stratosphere,Trend,Troposphere},
  language     = {eng},
  location     = {Rome, Italy},
  month        = {04},
  publisher    = {EDP Sciences},
  title        = {CARIBIC observations of gaseous mercury in the upper troposphere and lower stratosphere},
  url          = {http://dx.doi.org/10.1051/e3sconf/20130117001},
  volume       = {1},
  year         = {2013},
}