El Niño-Southern Oscillation influence on tropospheric mercury concentrations

Franz Slemr*, Carl A. Brenninkmeijer, Armin Rauthe-Schöch, Andreas Weigelt, Ralf Ebinghaus, Ernst Günther Brunke, Lynwill Martin, T. Gerard Spain, Simon O'Doherty

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

12 Citations (Scopus)
290 Downloads (Pure)

Abstract

The El Niño-Southern Oscillation (ENSO) affects the tropospheric concentrations of many trace gases. Here we investigate the ENSO influence on mercury concentrations measured in the upper troposphere during Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrumented Container flights and at ground at Cape Point, South Africa, and Mace Head, Ireland. Mercury concentrations cross-correlate with Southern Oscillation Index (SOI) with a lag of 8±2months. Highest mercury concentrations are always found at the most negative SOI values, i.e., 8months after El Niño, and the amplitude of the interannual variations fluctuates between ~5 and 18%. The time lag is similar to that of CO whose interannual variations are driven largely by emissions from biomass burning (BB). The amplitude of the interannual variability of tropospheric mercury concentrations is consistent with the estimated variations in mercury emissions from BB. We thus conclude that BB is a major factor driving the interannual variation of tropospheric mercury concentrations.

Original languageEnglish
Pages (from-to)1766-1771
Number of pages6
JournalGeophysical Research Letters
Volume43
Issue number4
Early online date25 Feb 2016
DOIs
Publication statusPublished - 16 Mar 2016

Keywords

  • ENSO
  • mercury
  • troposphere
  • biomass burning

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