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CCImed : Climate Chemistry Interactions over the Mediterranean Basin

by Yves Tramblay - published on , updated on

The Mediterranean basin is located at the crossroads of air masses carrying gas phase species such as ozone and precursors, as well as natural (desertic particles, sea-salt, SOA) and anthropogenic (black carbon, sulphate, etc.) particles. These species contributes to regional pollution and can have strong effects on the regional radiative budget with ensuing impact on regional climate fluctuations from daily to multi-decadal scales as well as on ecosystems of the Mediterranean Sea.
The atmospheric chemistry of the Mediterranean region is complex due to the variety of compounds and sources of natural and anthropogenic origins. Air masses transport patterns are under the influence of large scale dynamics and global climate variability but typical regional dynamics (e.g. meso-scale systems, sea breeze and topography effects) can also greatly affects e.g. pollution level or aerosol radiative forcing gradients. Several projections have pointed out both the sensitivity of Mediterranean region to climate change, and the importance of growing anthropogenic pressures impacting chemical emissions and land use notably on the southern basin.

In this context the CCImed working group, in close collaboration with the Med-CORDEX program, aims at building a model inter-comparison exercise based on ensemble projections of regional climate-chemistry models. A key question to be addressed is : How well can we characterize past and future changes in ozone and aerosol cycle variability over the Mediterranean basin, key mechanisms at play, and how to improve the confidence level of projections ?