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Abstract Title: A Multi-model Analysis of Mercury Deposition Based on Different Emission Inventories
Presenter Name: Charikleia Gournia
Company/Institution: CNR-IIA
Session: Atmospheric Hg cycling: Source and Emissions
Day and Session: Wednesday 27th July - Session Four
Start Time: 16:00 UTC
Co-Authors: Charikleia Gournia

Abstract Information :

Anthropogenic emissions raise atmospheric mercury (Hg) levels locally, regionally, and globally. The Minamata Convention on Mercury aims to protect human health and the environment from anthropogenic emissions and releases of Hg and includes in its provisions the development and improvement of modeling frameworks for global Hg assessment and the effectiveness evaluation of emission reduction strategies. Global emission inventories are a key component of global Hg modeling, used as input data sets for the transport mechanisms and chemical reactions. A deeper comprehension of the differences between inventories could deliver information regarding their impact on Hg deposition fields and identify areas for further study. This study performs an extensive analysis of Hg deposition patterns, with a focus on their spatial and temporal variability. We use global-scale transport models and a number of numerical experiments driven by different global Hg emission inventories. Moreover, different Hg oxidation mechanisms are used to assess the chemical transformations, Hg transport, and atmospheric residence time. The results from the chemical transport models are compared with available measured data from ground-based sites in source and remote areas. The analysis determines the sources and crucial factors involved in the trends of atmospheric deposition of Hg species. In parallel, this work contributes to an examination of the impact of Hg sources on deposition with spatial, seasonal, and emission control changes. On a global scale, the latitudinal patterns of Hg deposition are similar when using inventories that rely on different approaches and levels of detail. Contrarily, atmospheric chemistry has a significant effect on the spatial distribution and temporal variation of Hg deposition. Understanding how reliable measurements of atmospheric Hg species at remote receptor sites can shed light on Hg sources with a high degree of uncertainty, is essential for establishing better monitoring strategies.

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