Aircraft measurements of nitrogen and phosphorus in and around the Lake Tahoe Basin: Implications for possible sources of atmospheric pollutants to Lake Tahoe. Zhang, Q., Carroll, J., J., Dixon, A., J., & Anastasio, C. Environmental Science & Technology, 36(23):4981-4989, 2002.
Paper abstract bibtex Atmospheric deposition of nitrogen (N) and phosphorus (P) into Lake Tahoe appears to have been a major factor responsible for the shifting of the lake's nutrient response from N-limited to P-limited. To characterize atmospheric N and P in and around the Lake Tahoe Basin during summer, samples were collected using an instrumented aircraft flown over three locations: the Sierra Nevada foothills east of Sacramento ("low-Sierra"), further east and higher in the Sierra ("mid-Sierra"), and in the Tahoe Basin. Measurements were also made within the smoke plume downwind of an intense forest fire just outside the Tahoe Basin. Samples were collected using a denuder-filter pack sampling system (DFP) and analyzed for gaseous and water-soluble particle components including HNO3/NO3-, NH3/NH4+, organic N (ON), total N, SRP (soluble reactive phosphate) and total P. The average total gaseous and particulate N concentrations (+/- 1sigma) measured over the low- and mid-Sierra were 660 (+/- 270) and 630 (+/- 350) nmol N/m(3)-air, respectively. Total airborne N concentrations in the Tahoe samples were one-half to one-fifth of these values. The forest fire plume had the highest concentration of atmospheric N (860 nmol N/m(3)-air) and a greater contribution of organic N (ON) to the total N compared to nonsmoky conditions. Airborne P was rarely observed over the low- and mid-Sierra but was present at low concentrations over Lake Tahoe, with average (+/- 1sigma) concentrations of 2.3 +/- 2.9 and 2.8 +/- 0.8 nmol p/m(3)-air under typical clear air and slightly smoky air conditions, respectively. Phosphorus in the forest fire plume was present at concentrations similar to10 times greater than over the Tahoe Basin. P in these samples included both fine and coarse particulate phosphate as well as unidentified, possibly organic, gaseous P species. Overall, our results suggest that out-of-basin emissions could be significant sources of nitrogen to Lake Tahoe during the summer and that forest fires could be important sources of both N and P,. [References: 39] 39
@article{
title = {Aircraft measurements of nitrogen and phosphorus in and around the Lake Tahoe Basin: Implications for possible sources of atmospheric pollutants to Lake Tahoe},
type = {article},
year = {2002},
keywords = {California central valley. Sierra-nevada. Wood ash,Environment/Ecology in Current Contents(R)/Agricul},
pages = {4981-4989},
volume = {36},
id = {6c416510-149d-3676-bbca-15fc5ef4fb25},
created = {2015-02-12T14:35:44.000Z},
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last_modified = {2015-02-12T20:23:34.000Z},
read = {false},
starred = {false},
authored = {false},
confirmed = {true},
hidden = {false},
source_type = {Journal Article},
notes = {<m:note>English Article<m:linebreak/>Current Contents(R)/Agriculture, Biology & Environmental Sciences Current Contents(R)/Engineering, Computing & Technology.<m:linebreak/>Reprint available from: Carroll JJ Univ Calif Davis, Atmospher Sci Programme, Dept Land Air & Water Resources One Sheilds Ave Davis, CA 95616 USA Univ Calif Davis, Atmospher Sci Programme, Dept Land Air & Water Resources Davis, CA 95616 USA 0011 Environ. Sci. Technol</m:note>},
abstract = {Atmospheric deposition of nitrogen (N) and phosphorus (P) into Lake Tahoe appears to have been a major factor responsible for the shifting of the lake's nutrient response from N-limited to P-limited. To characterize atmospheric N and P in and around the Lake Tahoe Basin during summer, samples were collected using an instrumented aircraft flown over three locations: the Sierra Nevada foothills east of Sacramento ("low-Sierra"), further east and higher in the Sierra ("mid-Sierra"), and in the Tahoe Basin. Measurements were also made within the smoke plume downwind of an intense forest fire just outside the Tahoe Basin. Samples were collected using a denuder-filter pack sampling system (DFP) and analyzed for gaseous and water-soluble particle components including HNO3/NO3-, NH3/NH4+, organic N (ON), total N, SRP (soluble reactive phosphate) and total P. The average total gaseous and particulate N concentrations (+/- 1sigma) measured over the low- and mid-Sierra were 660 (+/- 270) and 630 (+/- 350) nmol N/m(3)-air, respectively. Total airborne N concentrations in the Tahoe samples were one-half to one-fifth of these values. The forest fire plume had the highest concentration of atmospheric N (860 nmol N/m(3)-air) and a greater contribution of organic N (ON) to the total N compared to nonsmoky conditions. Airborne P was rarely observed over the low- and mid-Sierra but was present at low concentrations over Lake Tahoe, with average (+/- 1sigma) concentrations of 2.3 +/- 2.9 and 2.8 +/- 0.8 nmol p/m(3)-air under typical clear air and slightly smoky air conditions, respectively. Phosphorus in the forest fire plume was present at concentrations similar to10 times greater than over the Tahoe Basin. P in these samples included both fine and coarse particulate phosphate as well as unidentified, possibly organic, gaseous P species. Overall, our results suggest that out-of-basin emissions could be significant sources of nitrogen to Lake Tahoe during the summer and that forest fires could be important sources of both N and P,. [References: 39] 39},
bibtype = {article},
author = {Zhang, Q and Carroll, J J and Dixon, A J and Anastasio, C},
journal = {Environmental Science & Technology},
number = {23}
}
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Technol</m:note>","abstract":"Atmospheric deposition of nitrogen (N) and phosphorus (P) into Lake Tahoe appears to have been a major factor responsible for the shifting of the lake's nutrient response from N-limited to P-limited. To characterize atmospheric N and P in and around the Lake Tahoe Basin during summer, samples were collected using an instrumented aircraft flown over three locations: the Sierra Nevada foothills east of Sacramento (\"low-Sierra\"), further east and higher in the Sierra (\"mid-Sierra\"), and in the Tahoe Basin. Measurements were also made within the smoke plume downwind of an intense forest fire just outside the Tahoe Basin. Samples were collected using a denuder-filter pack sampling system (DFP) and analyzed for gaseous and water-soluble particle components including HNO3/NO3-, NH3/NH4+, organic N (ON), total N, SRP (soluble reactive phosphate) and total P. The average total gaseous and particulate N concentrations (+/- 1sigma) measured over the low- and mid-Sierra were 660 (+/- 270) and 630 (+/- 350) nmol N/m(3)-air, respectively. Total airborne N concentrations in the Tahoe samples were one-half to one-fifth of these values. The forest fire plume had the highest concentration of atmospheric N (860 nmol N/m(3)-air) and a greater contribution of organic N (ON) to the total N compared to nonsmoky conditions. Airborne P was rarely observed over the low- and mid-Sierra but was present at low concentrations over Lake Tahoe, with average (+/- 1sigma) concentrations of 2.3 +/- 2.9 and 2.8 +/- 0.8 nmol p/m(3)-air under typical clear air and slightly smoky air conditions, respectively. Phosphorus in the forest fire plume was present at concentrations similar to10 times greater than over the Tahoe Basin. P in these samples included both fine and coarse particulate phosphate as well as unidentified, possibly organic, gaseous P species. Overall, our results suggest that out-of-basin emissions could be significant sources of nitrogen to Lake Tahoe during the summer and that forest fires could be important sources of both N and P,. [References: 39] 39","bibtype":"article","author":"Zhang, Q and Carroll, J J and Dixon, A J and Anastasio, C","journal":"Environmental Science & Technology","number":"23","bibtex":"@article{\n title = {Aircraft measurements of nitrogen and phosphorus in and around the Lake Tahoe Basin: Implications for possible sources of atmospheric pollutants to Lake Tahoe},\n type = {article},\n year = {2002},\n keywords = {California central valley. Sierra-nevada. Wood ash,Environment/Ecology in Current Contents(R)/Agricul},\n pages = {4981-4989},\n volume = {36},\n id = {6c416510-149d-3676-bbca-15fc5ef4fb25},\n created = {2015-02-12T14:35:44.000Z},\n file_attached = {true},\n profile_id = {81af7548-db00-3f00-bfa0-1774347c59e1},\n group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},\n last_modified = {2015-02-12T20:23:34.000Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n source_type = {Journal Article},\n notes = {<m:note>English Article<m:linebreak/>Current Contents(R)/Agriculture, Biology & Environmental Sciences Current Contents(R)/Engineering, Computing & Technology.<m:linebreak/>Reprint available from: Carroll JJ Univ Calif Davis, Atmospher Sci Programme, Dept Land Air & Water Resources One Sheilds Ave Davis, CA 95616 USA Univ Calif Davis, Atmospher Sci Programme, Dept Land Air & Water Resources Davis, CA 95616 USA 0011 Environ. Sci. Technol</m:note>},\n abstract = {Atmospheric deposition of nitrogen (N) and phosphorus (P) into Lake Tahoe appears to have been a major factor responsible for the shifting of the lake's nutrient response from N-limited to P-limited. To characterize atmospheric N and P in and around the Lake Tahoe Basin during summer, samples were collected using an instrumented aircraft flown over three locations: the Sierra Nevada foothills east of Sacramento (\"low-Sierra\"), further east and higher in the Sierra (\"mid-Sierra\"), and in the Tahoe Basin. Measurements were also made within the smoke plume downwind of an intense forest fire just outside the Tahoe Basin. Samples were collected using a denuder-filter pack sampling system (DFP) and analyzed for gaseous and water-soluble particle components including HNO3/NO3-, NH3/NH4+, organic N (ON), total N, SRP (soluble reactive phosphate) and total P. The average total gaseous and particulate N concentrations (+/- 1sigma) measured over the low- and mid-Sierra were 660 (+/- 270) and 630 (+/- 350) nmol N/m(3)-air, respectively. Total airborne N concentrations in the Tahoe samples were one-half to one-fifth of these values. The forest fire plume had the highest concentration of atmospheric N (860 nmol N/m(3)-air) and a greater contribution of organic N (ON) to the total N compared to nonsmoky conditions. Airborne P was rarely observed over the low- and mid-Sierra but was present at low concentrations over Lake Tahoe, with average (+/- 1sigma) concentrations of 2.3 +/- 2.9 and 2.8 +/- 0.8 nmol p/m(3)-air under typical clear air and slightly smoky air conditions, respectively. Phosphorus in the forest fire plume was present at concentrations similar to10 times greater than over the Tahoe Basin. P in these samples included both fine and coarse particulate phosphate as well as unidentified, possibly organic, gaseous P species. 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