Chemical constituents in the air and snow at Dye 3, Greenland—II. Analysis of episodes in April 1989

Detailed examination of a two-week period in April 1989 during the Dye 3 Gas and Aerosol Sampling Program shows that episodes of relatively high concentration of certain chemical constituents occur at this time of year. Airborne concentrations of crustal metals such as Al and Ca can exceed 100 ng mâ...

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Bibliographic Details
Published in:Atmospheric Environment. Part A. General Topics
Main Authors: Davidson, C, Jaffrezo, J L, Mosher, B W, Dibb, Jack E., Borys, R D, Bodhaine, B A, Rasmussen, R A, Boutron, C F, Ducroz, F M, Cahier, M, Ducret, J, Colin, J.-L., Heidam, N Z, Kemp, K, Hillamo, R
Format: Text
Language:unknown
Published: University of New Hampshire Scholars' Repository 1993
Subjects:
DGASP
Greenland
aerosols
sulfate
MSA
trace metals
radionuclides
trajectories
meteorology
scavenging ratios
Atmospheric Sciences
Dye 3
Dye-3
Online Access:https://scholars.unh.edu/earthsci_facpub/84
https://doi.org/10.1016/0960-1686(93)90305-I
Description
Summary:Detailed examination of a two-week period in April 1989 during the Dye 3 Gas and Aerosol Sampling Program shows that episodes of relatively high concentration of certain chemical constituents occur at this time of year. Airborne concentrations of crustal metals such as Al and Ca can exceed 100 ng m−3, while concentrations of SO42− can exceed 1000 ng m−3. Elevated concentrations of MSA, 7Be and 210Pb are also noted. Consideration of synoptic maps and backward air mass trajectories suggests that the episodes are due to transport from a variety of source regions, including Eurasia (transport over the Pole), North America and western Europe. In addition to elevated airborne concentrations, levels of these constituents in surface snow are high during April. However, it is difficult to develop quantitative relationships between concentrations in air and in snow due to the difficulty in measuring airborne concentrations at cloud-level; variations in scavenging by clouds may also be significant. It is concluded that the springtime maxima in airborne concentrations resulting from long-range transport from a variety of source regions are responsible for strong identifiable signals in ice cores and snowpits from this region.

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