Hydrological and geochemical response and recovery in disturbed arctic ecosystems
Technical Report
·
OSTI ID:5712066
The four years of precipitation data from the Imnavait Creek watershed indicates quantity and ionic composition of the various types of precipitation which constitute the principal ionic input. It appears that the precipitation chemistry is dominated by air masses originating in the southeast and southwest quadrants and reflects a strong continental influence, particularly in summer when local wind-generated dust and extra-regional forest fire imputs (most of natural origin) are important. Nitric, sulfuric and organic acids are the principal contributions to precipitation acidity. The sources of measured anions in summer rainfall are thought to be of biogenic and of forest fire origin. Those associated with snow may originate from anthropogenic sources to the north (Prudhoe Bay) and in air masses moving from the central USSR over the pole. The SO{sub 4}{sup 2{minus}} and NO{sub 3}{sup {minus}} in rime may have a northern (non-marine) source. Increased attention to individual, commonly low volume, rain events subsumed in the eight-day sampling scheme, are key to the accurate determination of sources. A near ionic balance was found in two of the three years of record. Undetermined organic anions are called upon to make up the anion deficiency. On an area basis the Imnavait Creek watershed receives a total ion input of approximately 31 kg ha{sup {minus}1}a{sup {minus}1} chiefly from rain and snow, which from year to year range widely in their individual contribution. 17 refs., 7 figs., 4 tabs.
- Research Organization:
- Ohio State Univ. Research Foundation, Columbus, OH (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-84ER60246
- OSTI ID:
- 5712066
- Report Number(s):
- DOE/ER/60246-T2; ON: DE89017559
- Country of Publication:
- United States
- Language:
- English
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