Data for "Ammonia Dry Deposition in an Alpine Ecosystem Traced to Agricultural Emission Hotpots"

Pan, Da; Benedict, Katherine; Golston, Levi; Wang, Rui; Collett, Jeffrey Jr; Tao, Lei; Sun, Kang; Guo, Xuehui; Ham, Jay; Prenni, Anthony; Schichtel, Bret; Mikoviny, Tomas; Müller, Markus; Wisthaler, Armin; Zondlo, Mark
Issue date: 2021
Cite as:
Pan, Da, Benedict, Katherine, Golston, Levi, Wang, Rui, Collett, Jeffrey Jr, Tao, Lei, Sun, Kang, Guo, Xuehui, Ham, Jay, Prenni, Anthony, Schichtel, Bret, Mikoviny, Tomas, Müller, Markus, Wisthaler, Armin, & Zondlo, Mark. (2021). Data for "Ammonia Dry Deposition in an Alpine Ecosystem Traced to Agricultural Emission Hotpots" [Data set]. Princeton University.
  author      = {Pan, Da and
                Benedict, Katherine and
                Golston, Levi and
                Wang, Rui and
                Collett, Jeffrey Jr and
                Tao, Lei and
                Sun, Kang and
                Guo, Xuehui and
                Ham, Jay and
                Prenni, Anthony and
                Schichtel, Bret and
                Mikoviny, Tomas and
                Müller, Markus and
                Wisthaler, Armin and
                Zondlo, Mark},
  title       = {{Data for "Ammonia Dry Deposition in an A
                lpine Ecosystem Traced to Agricultural E
                mission Hotpots"}},
  publisher   = {{Princeton University}},
  year        = 2021,
  url         = {}

Elevated reactive nitrogen (Nr) deposition is a concern for alpine ecosystems, and dry NH3 deposition is a key contributor. Understanding how emission hotspots impact downwind ecosystems through dry NH3 deposition provides opportunities for effective mitigation. However, direct NH3 flux measurements with sufficient temporal resolution to quantify such events are rare. Here, we measured NH3 fluxes at Rocky Mountain National Park (RMNP) during two summers and analyzed transport events from upwind agricultural and urban sources in northeastern Colorado. We deployed open-path NH3 sensors on a mobile laboratory and an eddy covariance tower to measure NH3 concentrations and fluxes. Our spatial sampling illustrated an upslope event that transported NH3 emissions from the hotspot to RMNP. Observed NH3 deposition was significantly higher when backtrajectories passed through only the agricultural region (7.9 ng m-2 s-1) versus only the urban area (1.0 ng m-2 s-1) and both urban and agricultural areas (2.7 ng m-2 s-1). Cumulative NH3 fluxes were calculated using observed, bidirectional modeled, and gap-filled fluxes. More than 40% of the total dry NH3 deposition occurred when air masses were traced back to agricultural source regions. More generally, we identified that 10 (25) more national parks in the U.S. are within 100 (200) km of an NH3 hotspot, and more observations are needed to quantify the impacts of these hotspots on dry NH3 depositions in these regions.

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# Filename Description Filesize
1 README.txt 4.68 KB
2 DAQ_CO_0722_ground_mobile.csv 4.51 MB
3 DAQ_CO_0731_ground_mobile.csv 5.02 MB
4 EC_flux_results_2015.csv 326 KB
5 EC_flux_results_2016.csv 1.56 MB
6 Gap_filled_flux_data_2016.csv 171 KB