FN Archimer Export Format
PT J
TI Mercury stable isotopes constrain atmospheric sources to the ocean
BT 
AF Jiskra, Martin
   Heimbürger-Boavida, Lars-Eric
   Desgranges, Marie-Maëlle
   Petrova, Mariia V.
   Dufour, Aurélie
   Ferreira-Araujo, Beatriz
   Masbou, Jérémy
   Chmeleff, Jérôme
   Thyssen, Melilotus
   Point, David
   Sonke, Jeroen E.
AS 1:1,2;2:2,3;3:3;4:3;5:3;6:2;7:2,4;8:2;9:3;10:2;11:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 Environmental Geosciences, University of Basel, Basel, Switzerland
   Géosciences Environnement Toulouse, CNRS/IRD/Université Paul Sabatier Toulouse III, Toulouse, France
   Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, France
   Institut Terre et Environnement de Strasbourg, Université de Strasbourg/EOST/ENGEES/CNRS, Strasbourg, France
C2 UNIV BASEL, SWITZERLAND
   UNIV TOULOUSE, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   UNIV STRASBOURG, FRANCE
IF 69.504
TC 78
UR https://archimer.ifremer.fr/doc/00727/83870/88927.pdf
LA English
DT Article
CR GEOVIDE
   VESPA
BO Pourquoi pas ?
   L'Atalante
   Antedon II
AB Human exposure to toxic mercury (Hg) is dominated by the consumption of seafood1,2. Earth system models suggest that Hg in marine ecosystems is supplied by atmospheric wet and dry Hg(ii) deposition, with a three times smaller contribution from gaseous Hg(0) uptake3,4. Observations of marine Hg(ii) deposition and Hg(0) gas exchange are sparse, however5, leaving the suggested importance of Hg(ii) deposition6 ill-constrained. Here we present the first Hg stable isotope measurements of total Hg (tHg) in surface and deep Atlantic and Mediterranean seawater and use them to quantify atmospheric Hg deposition pathways. We observe overall similar tHg isotope compositions, with median Δ200Hg signatures of 0.02‰, lying in between atmospheric Hg(0) and Hg(ii) deposition end-members. We use a Δ200Hg isotope mass balance to estimate that seawater tHg can be explained by the mixing of 42% (median; interquartile range, 24–50%) atmospheric Hg(ii) gross deposition and 58% (50–76%) Hg(0) gross uptake. We measure and compile additional, global marine Hg isotope data including particulate Hg, sediments and biota and observe a latitudinal Δ200Hg gradient that indicates larger ocean Hg(0) uptake at high latitudes. Our findings suggest that global atmospheric Hg(0) uptake by the oceans is equal to Hg(ii) deposition, which has implications for our understanding of atmospheric Hg dispersal and marine ecosystem recovery. 
PY 2021
PD SEP
SO Nature
SN 0028-0836
PU Springer Science and Business Media LLC
VL 597
IS 7878
UT 000701996800026
BP 678
EP 682
DI 10.1038/s41586-021-03859-8
ID 83870
ER

EF