210Po, an atmospheric tracer of long-range transport of volcanic plumes

Atmospheric chemistry in volcanic plumes.

Recent field observations have shown that the atmospheric plumes of quiescently degassing volcanoes are chemically very active, pointing to the role of chemical cycles involving halogen species and heterogeneous reactions on aerosol particles that have previously been unexplored for this type of volcanic plumes. Key features of these measurements can be reproduced by numerical models such as th...

Atmospheric Long-Range Transport and Deposition of Mercury to Alaska

Atmospheric Tracer Transport Model Intercomparison Project (TransCom)

A multi-phase program of model intercomparison is proposed to reduce uncertainties in the global carbon budget resulting from differences among atmospheric tracer transport simulations. The TransCom program is already well underway, having begun in 1993 and completed two major experiments. The results to date are summarized in a Technical Report and indicate that significant differences among t...

Resolving intercontinental pollution plumes in global models of atmospheric transport

[1] Synoptic-scale pollution plumes in the free troposphere can preserve their identity as well-defined structures for a week or more while traveling around the globe. Eulerian chemical transport models (CTMs) have difficulty reproducing these layered structures due to numerical plume dissipation. We show that this dissipation is much faster than would be expected from the order of the advectio...

Atmospheric transport and deposition of Indonesian volcanic emissions

A regional climate model has been used to study the transport and deposition of sulfur (SO2 and SO 2− 4 ) and PbCl2 emissions from Indonesian volcanoes. The sensitivity of the atmospheric loss of these trace species to meteorological conditions and their solubility was examined. Two experiments were conducted: 1) volcanic sulfur released as primarily SO2 and subject to transport, deposition, an...