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Environmental Observation System

The Global Mercury Observation System (GMOS) is being developed to complement other existing atmospheric monitoring programs such as the US and Canadian programs (i.e., AMNet-Atmospheric Mercury Network; CAMNet - Canadian Atmospheric Mercury Measurement Network), the UNECE's European Monitoring and Evaluation Programme (EMEP) and the Arctic Monitoring and Assessment Program (AMAP). The monitoring network (see figure...) includes 47 sites that have contributed with historical datasets and with near real-time measurements.

The near real-time monitoring network provides measurements of Total and Speciated Mercury at ground-based sites distributed throughout  the northern and southern hemispheres. Data are collected in a raw format  and not Quality Controlled. In a subsequent phase all raw data undergo the same  Quality Assurance/Quality Control process un order to ensure a consistent dataset. The final dataset is archived in a general  Ground-based site database.

Ground-based measurements are complemented with oceanographic and tropospheric campaigns to support the development and validation of the regional and global atmospheric mercury models.

The over-water monitoring programme is performing measurement campaigns along routes in all the major oceans (see figure) and is integrating external monitoring campaigns such as GEOTRACES. The QA/QC database is archived in the SDI-Spatial Data Infrastructure.

The distribution of mercury in the troposphere is monitored through complementary experiments. The ongoing CARIBIC project (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrumented Container) (see figure) as well as the NOMADSS/SAS monitoring programme are integratedwith ad-hoc measurements made at regional level (i.e. ETMEP). The QA/QC database is archived in the SDI-Spatial Data Infrastructure.

Ground-based monitoring sites (map)