Climatological analysis of the Hubbard Brook (New Hampshire) precipitation chemistry data. Final report

Technical Report · Tue Nov 30 04:00:00 EST 1982

OSTI ID:5080383

Munn, R E; Likens, G E; Weisman, B; Hornbeck, J; Martin, C W; Bormann, F H; Oehlert, G W; Bloxam, R

Precipitation chemistry data from Hubbard Brook, NH are of two types: event measurements, June 1975 to July 1978, inclusive; and weekly measurements from 1963 to May 1980, inclusive. In both cases, concentrations are available for a range of chemical constituents of the precipitation samples. Five-day back trajectories have been computed for the storms. Together with a crossing-trajectory analysis, the results show the influence of source regions on the chemical climatology of Hubbard Brook. With respect to the weekly measurements, the statistical properties of the data set have been investigated, and 850-mb precipitation chemistry wind roses for Portland, Maine have been constructed. The latter show that Na concentrations are high with ENE-SE winds and that the Ca/Na ratio is a good indicator of off-ocean vs off-land flows. Other results of the wind-rose analysis include: H/sup +/ deposition and SO/sub 4/ deposition are high with S to WSW winds; NO/sub 3/ and H/sub 4/ concentrations are high with W-NW-N winds; and SO/sub 4/ concentrations are high with N-NE-E winds. Time series analyses of the 16-year data set have been undertaken. The results suggest: downward trends in concentrations of Na, Cl, Ca, Mg, K and Al and the ratio SO/sub 4//NO/sub 3/, and upward trends in NO/sub 3/ deposition and the ratio NO/sub 3//Na; in the case of pH, SO/sub 4/, NO/sub 3/ and NH/sub 4/, the time series seem to have changed slope about 1971; for the subset of cases with 850-mb winds from 300 to 069 deg., there is no trend in pH but a significant decline in SO/sub 4/ and NO/sub 3/ in winter; based on regional emission inventories for SO/sub 2/ and NO/sub x/ for the years 1965, 1970, 1975 and 1978, higher normalized wet depositions of SO/sub 4/ and NO/sub 3/ are associated with years having higher regional emissions of SO/sub 2/ and NO/sub x/, respectively. 15 references, 108 figures, 17 tables.

• Research Organization: Toronto Univ., Ontario (Canada). Inst. for Environmental Studies
• DOE Contract Number: FG01-80EV10455
• OSTI ID: 5080383
• Report Number(s): DOE/EV/10455-T1; ON: DE84008958
• Country of Publication: United States
• Language: English

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500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACID RAIN
ALKALI METALS
ALKALINE EARTH METALS
ALUMINIUM
ATMOSPHERIC PRECIPITATIONS
CALCIUM
CHEMICAL COMPOSITION
CHLORIDES
CHLORINE COMPOUNDS
DATA
DATA COMPILATION
ECOLOGICAL CONCENTRATION
ELEMENTS
ENVIRONMENTAL TRANSPORT
FEDERAL REGION I
HALIDES
HALOGEN COMPOUNDS
INFORMATION
MAGNESIUM
MASS TRANSFER
MATHEMATICS
METALS
NEW HAMPSHIRE
NITRATES
NITROGEN COMPOUNDS
NORTH AMERICA
NUMERICAL DATA
OXYGEN COMPOUNDS
PH VALUE
POTASSIUM
RAIN
SEASONAL VARIATIONS
SODIUM
SULFATES
SULFUR COMPOUNDS
TIME-SERIES ANALYSIS
USA
VARIATIONS
WIND