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Mercury distribution in the upper troposphere and lowermost stratosphere according to measurements by the IAGOS-CARIBIC observatory: 2014-2016

Slemr, F.; Weigelt, A.; Ebinghaus, R.; Bieser, J.; Brenninkmeijer, C. A. M.; Rauthe-Schöch, A.; Hermann, M.; Martinsson, B. G.; Van Velthoven, P.; Bönisch, H. 1; Neumaier, M. ORCID iD icon 1; Zahn, A. 1; Ziereis, H.
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract:

Mercury was measured onboard the IAGOSCARIBIC passenger aircraft from May 2005 until February 2016 during near monthly sequences of mostly four intercontinental flights from Germany to destinations in North and South America, Africa and South and East Asia. Most of these mercury data were obtained using an internal default signal integration procedure of the Tekran instrument but since April 2014 more precise and accurate data were obtained using post-flight manual integration of the instrument raw signal. In this paper we use the latter data. Increased upper tropospheric total mercury (TM) concentrations due to large scale biomass burning were observed in the upper troposphere (UT) at the equator and southern latitudes during the flights to Latin America and South Africa in boreal autumn (SON) and boreal winter (DJF). TM concentrations in the lowermost stratosphere (LMS) decrease with altitude above the thermal tropopause but the gradient is less steep than reported before. Seasonal variation of the vertical TM distribution in the UT and LMS is similar to that of other trace gases with surface sources and stratospheric sinks. Speciation experiments suggest comparable TM and gaseous elementary mercury (GEM) concentrations at and below the tropopause leaving little space for Hg2+ (TM-GEM) being the dominating component of TM here. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000085881
Veröffentlicht am 24.09.2018
Originalveröffentlichung
DOI: 10.5194/acp-18-12329-2018
Scopus
Zitationen: 21
Web of Science
Zitationen: 20
Dimensions
Zitationen: 22
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
urn:nbn:de:swb:90-858813
KITopen-ID: 1000085881
HGF-Programm 12.03.01 (POF III, LK 01) Long term observations of tropospheric
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 18
Heft 16
Seiten 12329-12343
Nachgewiesen in Scopus
Dimensions
Web of Science
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