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- W4246156957 abstract "Abstract. Atmospheric mercury (Hg) measurements using the Tekran® analytical system from 5 high-elevation sites (1400–3200 m elevation), one in Asia and 4 in the western US, were compiled over multiple seasons and years, and these data were compared with the global model GEOS-Chem. Mercury data consisted of gaseous elemental Hg (GEM) and reactive Hg (RM) which is a combination of the gaseous oxidized (GOM) and particulate bound (< 2.5 μm) (PBM) fractions as measured by the Tekran® system. We used a subset of the observations by defining a free tropospheric (FT) dataset by screening using measured water vapor mixing ratios. The oxidation scheme used by the GEOS-Chem model was varied between the standard run with Br oxidation and an alternative run with OH-O3 oxidation. We used this model-measurement comparison to help interpret the spatio-temporal trends in, and relationships among the Hg species and ancillary parameters and to better understand the sources and fate of atmospheric RM. The most salient feature of the data across sites, seen more in the summer relative to the spring, was that RM was negatively correlated with GEM and water vapor mixing ratios (WV) and positively correlated with ozone (O3) both in the standard model and for most of the observations, indicating that RM was formed in dry upper altitude air from the photo-oxidation of GEM. Overall, however, the comparison between observed mercury species (GEM and RM) and those from the standard model showed a relatively weak relationship demonstrating the need to strengthen our understanding of fundamental chemistry and measurement artifacts. An improved correlation between the observations and the model was seen when the model was run with the OH-O3 oxidation scheme instead of the Br oxidation scheme. This simulation produced higher concentrations of RM and lower concentrations of GEM, especially at the desert sites in northwestern Nevada, which raises the possibility that OH as an oxidant via the HgBr+OH pathway could be more important in the summer at desert sites, compared to the mountaintop sites at Storm Peak and Mount Bachelor." @default.
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- W4246156957 date "2014-09-08" @default.
- W4246156957 modified "2023-09-28" @default.
- W4246156957 title "Use of a global model to understand speciated atmospheric mercury observations at five high-elevation sites" @default.
- W4246156957 doi "https://doi.org/10.5194/acpd-14-22763-2014" @default.
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