The major goal of the process study between April 15 and May 15, 2003 is to obtain quantified information on reaction path-ways, products and net deposition of mercury during Arctic sunrise.
Simultaneous measurements of gaseous elemental mercury (GEM), reactive gaseous mercury (RGM) and particulate-phase mercury (PPM) will be carried out between April 15 and May 15, 2003. GEM and RGM will be measured on-line with a time resolution of 15 minutes or 1 hour respectively. Changes in the relative concentration ratio of these species from the pre-depletion towards the depletion period will provide a better insight in the reaction pathways and the resulting products. Similar measurements will be carried out by other groups at the Zeppelin Station. Comparison of the results will give information on the role of the marine boundary layer on the atmospheric chemistry of mercury, since Zeppelin Station is located about 450 m a.s.l. , whereas Koldewey is almost at sea level and also closer to the coast line.
The intended research work is part of an international process study aimed at a better understanding of the recently discovered phenomenon of mercury depletion events (MDEs) in polar environments during springtime. The planned process study consists of a number of simultaneous measurements of atmospheric mercury and related parameters by the applicant at Koldewey, and at the Zeppelin-Station, the French and Italian station at Ny Alesund. Participants of the Process Study will probably be - Norwegian Institute for Air Research (NILU) as the coordinating institute - Swedish Environmental Research Institute, IVL - Chalmers University, Göteborg - Institute for Atmospheric Pollution, Rende, Italy (IIA-CNR) - Institute de Glaciology, Grenoble, France - Environment Canada, Meteorological Service of Canada (MSC) - Oak Ridge National Laboratory, (ORNL), USA - National Oceanic and Atmospheric Administration (NOAA), USA It should be noted, that the list of participating laboratories is presently only a tentative one.