Atmospheric Environment, Journal Year: 2024, Volume and Issue: 329, P. 120530 - 120530
Published: April 22, 2024
Language: Английский
ACS ES&T Air, Journal Year: 2024, Volume and Issue: 1(3), P. 200 - 222
Published: Feb. 21, 2024
The Alaskan Layered Pollution And Chemical Analysis (ALPACA) field experiment was a collaborative study designed to improve understanding of pollution sources and chemical processes during winter (cold climate low-photochemical activity), investigate indoor pollution, dispersion as affected by frequent temperature inversions. A number the research goals were motivated questions raised residents Fairbanks, Alaska, where held. This paper describes measurement strategies conditions encountered January February 2022 experiment, reports early examples how measurements addressed goals, particularly those interest residents. Outdoor air showed high concentrations particulate matter pollutant gases including volatile organic carbon species. During events, low winds extremely stable atmospheric trapped below 73 m, an shallow vertical scale. Tethered-balloon-based intercepted plumes aloft, which associated with power plant point through transport modeling. Because cold spend much their time indoors, included quality component, made inside outside house infiltration sources. In absence activities such cooking and/or heating pellet stove, lower than outdoors; however, stove burns often caused higher outdoors. mass-normalized oxidative potential, health-relevant property measured here reactivity dithiothreiol, particles varied source, having less potential per mass particles.
Language: Английский
Citations
18
Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(2), P. 1063 - 1104
Published: Jan. 28, 2025
Abstract. Lagrangian tracer simulations are deployed to investigate processes influencing vertical and horizontal dispersion of anthropogenic pollution in Fairbanks, Alaska, during the Alaskan Layered Pollution Chemical Analysis (ALPACA) 2022 field campaign. Simulated concentrations carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), including surface elevated sources, highest at under very cold stable conditions. enhancements above (50–300 m) mainly attributed power plant emissions. Both sources contribute Fairbanks' regional that is transported downwind, primarily south-west, may wintertime Arctic haze. Inclusion a novel plume rise treatment considers presence temperature inversion layers leads improved agreement with observed CO NOx plumes, discrepancies to, for example, displacement plumes by modelled winds. At surface, model results show variability largely driven meteorology and, lesser extent, emissions, although simulated tracers sensitive dispersion. Modelled underestimation polluted conditions considerably following inclusion substantial increases diesel vehicle emissions temperatures (e.g. factor 6 −30 °C). In contrast, overestimation SO2 deficiencies (5–18 space heating This study highlights need improvements local simulation boundary layers.
Language: Английский
Citations
3
Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(6), P. 3687 - 3715
Published: March 27, 2025
Abstract. Vertical in situ measurements of aerosols and trace gases were conducted Fairbanks, Alaska, during winter 2022 as part the Alaskan Layered Pollution Chemical Analysis campaign (ALPACA). Using a tethered balloon, study explores dispersion pollutants continental high-latitude stable boundary layer (SBL). 24 flights revealed stratified SBL structure with different pollution layers lowest tens meters atmosphere, offering unprecedented detail. Surface emissions generally accumulated surface mixing (ML) extending to an average 51 m, well-mixed sublayer (MsL) reaching 22 m. The height concentrations within ML strongly influenced by local wind driven nearby topography under anticyclonic conditions. During strong radiative cooling, drainage flow increased turbulence near surface, altering temperature profile deepening ML. Above ML, decreased but showed clear signs freshly released anthropogenic emissions. Higher above elevated inversions, levels similar previously reported Arctic haze concentrations, even though Fairbanks' outflow below inversions up 6 times higher, likely due power plant In indicated that gas particle tracer ratios plumes differed significantly from those surface. Overall, correlated stratification emission heights, emphasizing need for improved representation sources air quality models enhance forecasts.
Language: Английский
Citations
0
Atmospheric Environment, Journal Year: 2024, Volume and Issue: 334, P. 120687 - 120687
Published: July 11, 2024
Language: Английский
Citations
3
Atmospheric Environment, Journal Year: 2024, Volume and Issue: 329, P. 120530 - 120530
Published: April 22, 2024
Language: Английский
Citations
0