Bishop, Kevin
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
Abstract
Vegetation uptake of gaseous elemental mercury (Hg-0) is the main deposition pathway to terrestrial environments. However, the fluxes and processes of forest-atmosphere Hg-0 exchange remain ill-constrained, especially in rainforests. To help address this, we used the 1 ha Masoala Rainforest hall of the Zoo Zurich as a dynamic flux chamber to measure net rainforest Hg-0 fluxes and even calibrate Hg-0 deposition velocities with turbulence measurements. The net Hg-0 flux correlated well with CO2 assimilation, showing peak Hg-0 uptake at noon. The interquartile range of Hg-0 uptake spanned from 1.69 to 3.45 ng m(-2) h(-1) during the day and from 0.01 to 0.44 ng m(-2) h(-1) at night. The study results revealed a Hg-0-specific canopy resistance (R-c = 1000 s m(-1)), which underlined the importance of stomatal uptake as a dominant Hg-0 deposition pathway in the rainforest. Even though a dynamic flux chamber, however large, is only an approximation of a real rainforest, our findings underline the value of whole-rainforest flux studies both for constraining Hg exchange with the atmosphere and resolving the role of specific mechanisms.
Keywords
tropics; forest; flux; deposition; GPP; CO2
Published in
Environmental Science and Technology
2025, volume: 59, number: 35, pages: 18675-18686
Publisher: AMER CHEMICAL SOC
SLU Authors
UKÄ Subject classification
Environmental Sciences
Meteorology and Atmospheric Sciences
Publication identifier
- DOI: https://doi.org/10.1021/acs.est.5c05823
Permanent link to this page (URI)
https://res.slu.se/id/publ/143713