Operation and research at the Ithaca MAP3S regional precipitation chemistry site
Annual precipitation chemistry data from network start-up through 1988 is presented for the nine MAP3S sites. Time trends show significant negative linear regressions (P < 0.10) for SO{sub 4}{sup 2-} at 2 sites, H{sup +} at 4 sites, Ca{sup ++} at 1 site, and Na{sup +} at 1 site. Significant positive regressions over time include: NH{sub 4}{sup +} at 2 sites, Ca{sup ++} at 1 site, K{sup +} at 4 sites, and Cl{sup {minus}} at 2 sites. The Ithaca site shows the highest number of significant trends, with positive trends for Cl{sup {minus}}, NH{sub 4}{sup +}, Ca{sup ++}, and K{sup +}, and a negative trend for H{sup +}. Linear regressions of annual SO{sub 4}{sup 2-} concentrations on SO2 emissions show a significant positive relationship for Whiteface, Illinois, and Ohio at p < 0.10, 0.02, and 0.05 respectively. Overall for all MAP3S sites, plus Hubbard Brook a 25% decline in SO2 emissions over the region has been accompanied by a 16.5% decline in annual precipitation concentrations of SO{sub 4}{sup 2-}. For the region as a whole, a 20% decline in combined emissions has been accompanied to a 20% decline in H{sup +} concentrations. Thus a linear relationship exists between combined emissions and precipitation H{sup +} concentrations. No strong relationship exists for NOx emissions and precipitation NO{sub 3}{sup {minus}} concentration at the annual, seasonal or monthly level. Removing the NOx transportation sector, removing high and low precipitation values, or high pH values also does little to improve the NOx -- NO{sub 3}{sup {minus}} concentration relationships. Dry deposition components such a PAN, NO2, gaseous HNO{sub 3}, or aerosol NO{sub 3}{sup {minus}} should be included in the future with precipitation NO{sub 3}{sup {minus}} to relate emissions of NOx to nitrogen deposition. 11 refs., 27 figs.,1 tab.
- Research Organization:
- Institute of Ecosystem Studies, Millbrook, NY (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-85ER60292
- OSTI ID:
- 5146720
- Report Number(s):
- DOE/ER/60292-7; ON: DE92000836
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ANNUAL VARIATIONS
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IONIC COMPOSITION
MATHEMATICS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
PROGRESS REPORT
REGRESSION ANALYSIS
STATISTICS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
VARIATIONS