| Main Title |
Trends in Catskill Stream Water Quality: Evidence from Historical Data. |
| Author |
Stoddard, J. L. ;
|
| CORP Author |
Corvallis Environmental Research Lab., OR. ;New York City Dept. of Environmental Protection, Valhalla. Kensico Lab. |
| Publisher |
c1991 |
| Year Published |
1991 |
| Report Number |
EPA/600/J-92/091; |
| Stock Number |
PB92-153832 |
| Additional Subjects |
Water quality data ;
Streams ;
Acidification ;
Water pollution sampling ;
Deposition ;
Trends ;
Catskill Mountains ;
Air pollution ;
Air water interactions ;
Cations ;
Nitrates ;
pH ;
Acid neutralizing capacity ;
Concentration(Composition) ;
Specific conductivity ;
Environmental surveys ;
Reprints ;
Calcium magnesium
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB92-153832 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
12p |
| Abstract |
Historical data for large streams in the Catskill Mountains indicate that acidic deposition has significantly influenced water quality, but that this effect is most observable in early (pre-1945) data, and consists primarily of increased base cation (CaMg) concentrations. More recent data suggest that landscape disturbance currently exerts a stronger influence on acid/base status of large streams than does acidic deposition, resulting in increases in both CaMg and acid-neutralizing capacity (ANC). Estimates of SO4(2-) concentration indicate that SO4(2-) is a conservative ion in the Catskills, and stream water concentrations have decreased since reaching maximum values around 1970, consistent with temporal trends in emissions and deposition in the northeastern United States. Nitrate concentrations, on the other hand, have increased substantially in all but one stream in the past two decades, independent of any change in nitrogen deposition in the region; changes in the capacity of watersheds to retain nitrogen are hypothesized as causes of increased stream water NO3(-). In small, undisturbed streams, increases in NO3(-) and decreases in CaMg appear to offset the effects of reduced SO4(2-), and lead to decreasing trends in ANC. (Copyright (c) 1991 by the American Geophysical Union.) |
| Supplementary Notes |
Pub. in November Water Resources Research, v27 n11 p2855-2864 1991. See also PB87-110383, PB90-100058 and PB90-265208. Prepared in cooperation with New York City Dept. of Environmental Protection, Valhalla. Kensico Lab. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Trends in Catskill Stream Water Quality: Evidence from Historical Data. |
| Category Codes |
68D; 48G |
| NTIS Prices |
PC A03/MF A01 |
| Primary Description |
600/02 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
211525615 |
| Origin |
NTIS |
| Type |
CAT |
