1. NADP-Compatible Wet Chemistry Sampler Data Analysis, 2000-2004 Telluride, CO Mark Williams Kim Raby University of Colorado Institute of Arctic and Alpine Research

2. Site Location

3. Event Sampling Summary Year Sample Collection Type # of Samples Sampling Time Period Total Rainfall Collected (cm) 2000Event32 19 June – 29 September 21.2 2001Weekly12 11 July – 2 October 15.4 2002Weekly14 17 June – 17 September 24.3 2003Weekly10 18 July – 29 September 18.0 2004Event37 18 June – 22 September 27.6

4. Inorganic N Loading Comparison Inorganic nitrogen deposition in wetfall to the Telluride NADP-compatible site and comparison to nearby NADP sites at Molas Pass and Wolf Creek Pass during the summers of 2000, 2001, 2002, and 2003 Inorganic nitrogen deposition in wetfall to the Telluride NADP-compatible site and comparison to nearby NADP sites at Molas Pass and Wolf Creek Pass during the summers of 2000, 2001, 2002, and 2003

5. Ammonium Deposition Comparison Ammonium-N deposition in wetfall to the Telluride NADP- compatible site and comparison to nearby NADP sites at Molas Pass and Wolf Creek Pass during the summers of 2000, 2001, 2002, and 2003 Ammonium-N deposition in wetfall to the Telluride NADP- compatible site and comparison to nearby NADP sites at Molas Pass and Wolf Creek Pass during the summers of 2000, 2001, 2002, and 2003

6. Nitrate Deposition Comparison Nitrate-N deposition in wetfall to the Telluride NADP- compatible site and comparison to nearby NADP sites at Molas Pass and Wolf Creek Pass during the summers of 2000, 2001, 2002, and 2003 Nitrate-N deposition in wetfall to the Telluride NADP- compatible site and comparison to nearby NADP sites at Molas Pass and Wolf Creek Pass during the summers of 2000, 2001, 2002, and 2003

7. Telluride Site Solute Concentrations VWM concentrations of ammonium, nitrate, and sulfate in wetfall to the Telluride NADP-compatible site for the summers of 2000, 2001, 2002, 2003, and 2004 VWM concentrations of ammonium, nitrate, and sulfate in wetfall to the Telluride NADP-compatible site for the summers of 2000, 2001, 2002, 2003, and 2004

8. Telluride IN Loading Monthly inorganic nitrogen deposition in wetfall to the Telluride NADP-compatible site for the summers of 2000, 2001, 2002, 2003, and 2004 Monthly inorganic nitrogen deposition in wetfall to the Telluride NADP-compatible site for the summers of 2000, 2001, 2002, 2003, and 2004

9. Linear Regression (R 2 = 0.77) Comparison of ammonium concentration to the sum of nitrate and sulfate concentrations for all precipitation samples collected at the Telluride NADP- compatible site, 2000-2004 Comparison of ammonium concentration to the sum of nitrate and sulfate concentrations for all precipitation samples collected at the Telluride NADP- compatible site, 2000-2004

10. 2002 Principal Component Analysis Principal component analysis of all solutes in precipitation at the Telluride NADP-compatible site in the summer of 2002 Principal component analysis of all solutes in precipitation at the Telluride NADP-compatible site in the summer of 2002

11. 2000 HYSPLIT Trajectories [A] Backward and forward trajectory analyses using HYSPLIT-4 for 18 August 2000. Both trajectories show that air masses passed over the Mojave Power Plant before reaching the event site [A] Backward and forward trajectory analyses using HYSPLIT-4 for 18 August 2000. Both trajectories show that air masses passed over the Mojave Power Plant before reaching the event site [B] Backward and forward trajectory analyses using HYSPLIT-4 for 25 August 2000. Air masses over the San Juan power plant reached Telluride and resulted in large amounts of inorganic N in wetfall at the event site [B] Backward and forward trajectory analyses using HYSPLIT-4 for 25 August 2000. Air masses over the San Juan power plant reached Telluride and resulted in large amounts of inorganic N in wetfall at the event site

12. Telluride Airflow Patterns As air cools adiabatically to rise over the mountain boundary, precipitation forms on the windward side of the mountains. Because these air masses have passed near or directly over power plants, the windward side of the mountains is the first area where the pollution contained in these air parcels is scrubbed by precipitation As air cools adiabatically to rise over the mountain boundary, precipitation forms on the windward side of the mountains. Because these air masses have passed near or directly over power plants, the windward side of the mountains is the first area where the pollution contained in these air parcels is scrubbed by precipitation

13. 2004 Back Trajectories – High Nitrate Backward trajectory analyses using HYSPLIT-4 for precipitation events with the highest nitrogen concentrations in 2004: 18 June 2004 (63.41 ueq/L NO3-), 22 June 2004 (87.07 ueq/L NO3-), 2 August 2004 (76.80 ueq/L NO3-), and 25 August 2004 (92.01 ueq/L NO3-) Backward trajectory analyses using HYSPLIT-4 for precipitation events with the highest nitrogen concentrations in 2004: 18 June 2004 (63.41 ueq/L NO3-), 22 June 2004 (87.07 ueq/L NO3-), 2 August 2004 (76.80 ueq/L NO3-), and 25 August 2004 (92.01 ueq/L NO3-) High nitrate-N concentrations came from all directions except the east- northeast direction High nitrate-N concentrations came from all directions except the east- northeast direction

14. 2004 Back Trajectories – Low Nitrate Backward trajectory analyses using HYSPLIT-4 for precipitation events with the lowest nitrogen concentrations in 2004: 17 July 2004 (9.21 ueq/L NO3-), 19 August 2004 (7.19 ueq/L NO3-), 19 September 2004 (6.84 ueq/L NO3-), and 20 September 2004 (2.60 ueq/L NO3-) Backward trajectory analyses using HYSPLIT-4 for precipitation events with the lowest nitrogen concentrations in 2004: 17 July 2004 (9.21 ueq/L NO3-), 19 August 2004 (7.19 ueq/L NO3-), 19 September 2004 (6.84 ueq/L NO3-), and 20 September 2004 (2.60 ueq/L NO3-) Low Nitrate-N concentrations came from variety of directions, with the exception of east-southeast Low Nitrate-N concentrations came from variety of directions, with the exception of east-southeast

15. 2004 Back Trajectories – High Rain Depth Backward trajectory analyses using HYSPLIT-4 for precipitation events with the highest rainfall depth: 4 September 2004 (1.15 inches), 19 September 2004 (1.07 inches), and 20 September 2004 (1.63 inches) Backward trajectory analyses using HYSPLIT-4 for precipitation events with the highest rainfall depth: 4 September 2004 (1.15 inches), 19 September 2004 (1.07 inches), and 20 September 2004 (1.63 inches) Samples with high rain depth all appeared to be generated from air parcels coming from the west-southwest region Samples with high rain depth all appeared to be generated from air parcels coming from the west-southwest region