Photoreduction of gaseous oxidized mercury changes global atmospheric mercury speciation, transport and deposition.

Abstract:

:Anthropogenic mercury (Hg(0)) emissions oxidize to gaseous Hg(II) compounds, before deposition to Earth surface ecosystems. Atmospheric reduction of Hg(II) competes with deposition, thereby modifying the magnitude and pattern of Hg deposition. Global Hg models have postulated that Hg(II) reduction in the atmosphere occurs through aqueous-phase photoreduction that may take place in clouds. Here we report that experimental rainfall Hg(II) photoreduction rates are much slower than modelled rates. We compute absorption cross sections of Hg(II) compounds and show that fast gas-phase Hg(II) photolysis can dominate atmospheric mercury reduction and lead to a substantial increase in the modelled, global atmospheric Hg lifetime by a factor two. Models with Hg(II) photolysis show enhanced Hg(0) deposition to land, which may prolong recovery of aquatic ecosystems long after Hg emissions are lowered, due to the longer residence time of Hg in soils compared with the ocean. Fast Hg(II) photolysis substantially changes atmospheric Hg dynamics and requires further assessment at regional and local scales.

journal_name

Nat Commun

journal_title

Nature communications

authors

Saiz-Lopez A,Sitkiewicz SP,Roca-Sanjuán D,Oliva-Enrich JM,Dávalos JZ,Notario R,Jiskra M,Xu Y,Wang F,Thackray CP,Sunderland EM,Jacob DJ,Travnikov O,Cuevas CA,Acuña AU,Rivero D,Plane JMC,Kinnison DE,Sonke JE

doi

10.1038/s41467-018-07075-3

subject

Has Abstract

pub_date

2018-11-15 00:00:00

pages

4796

issue

1

issn

2041-1723

pii

10.1038/s41467-018-07075-3

journal_volume

9

pub_type

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