Skip to Main content Skip to Navigation
Theses

An experimental study of atmospheric mercury photoreduction in rainfall

Abstract : Atmospheric Hg photoreduction could take place in both gas- and aqueous phase. Rainwater Hg(II) photoreduction rates, under fully sunlit conditions, are an order of magnitude slower than the optimized maximum in-cloud photoreduction rate of > 1.0 h-1 in global Hg models. Atmospheric aqueous Hg photoreduction is too slow to be dominant reduction pathway. Atmospheric gaseous HgBr2, HgCl2, HgBrNO2, HgBrHO2 forms, scavenged by aqueous aerosols and cloud droplets, are converted to Hg(II)-DOC forms in rainfall due to abundant organic carbon in aerosols and cloud water. Computation of gas phase photolysis rates of Hg(II) compounds can be fast, and is fast enough to rebalance the modeled atmospheric Hg cycle between Hg(0) oxidation and Hg(II) reduction.
Document type :
Theses
Complete list of metadatas

Cited literature [177 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02501328
Contributor : Abes Star :  Contact
Submitted on : Friday, March 6, 2020 - 5:14:08 PM
Last modification on : Thursday, October 15, 2020 - 3:09:34 AM
Long-term archiving on: : Sunday, June 7, 2020 - 4:04:30 PM

File

2019TOU30094b.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02501328, version 1

Collections

Citation

Xu Yang. An experimental study of atmospheric mercury photoreduction in rainfall. Ocean, Atmosphere. Université Paul Sabatier - Toulouse III, 2019. English. ⟨NNT : 2019TOU30094⟩. ⟨tel-02501328⟩

Share

Metrics

Record views

152

Files downloads

82