Estimates of long-term trends in sulfur deposition
Conference
·
OSTI ID:5809583
Knowledge of the trends in the wet and dry deposition of acidifying pollutants principally oxides of sulfur (SO/sub x/) and nitrogen (NO/sub x/), over the last several decades across North America would be extremely valuable to researchers in the National Acid Precipitation Assessment Program (NAPAP). Unfortunately, a lengthy, unambiguous data set that would provide this record does not exist. The best long-term record is that collected at Hubbard Brook in New Hampshire (National Research Council, 1983), where observations have been made regularly since the middle 1960s. However, the Hubbard Brook deposition data are based upon sampling using bulk collectors that may confound wet deposition with an unknown fraction of the dry deposition. Monitoring networks that can directly measure dry deposition have yet to be established. For the period of time for which adequate networks of wet-only samplers exist (roughly since near the end of the last decade), regional and national emission changes have been too small (of the order of 10% or less) for any emission-related changes in the wet deposition field to be separated statistically from climatologically-induced variability. In this paper we use a numerical long-range atmospheric transport model both to estimate the trend in North American sulfur deposition for the period 1975-1981 and to examine the relative importance of climatology and emission changes to variations in deposition. 5 refs., 2 figs., 2 tabs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5809583
- Report Number(s):
- CONF-860390-1; ON: DE86008000
- Country of Publication:
- United States
- Language:
- English
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