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Evaluation of Greenhouse Gases and Soil Microbiology at ARC Railroad Valley

This study focuses on calibrating GOSAT data while exploring CO2 and methane sources at ARC Railroad Valley. We demonstrate the capability for measuring greenhouse gas vertical profiles from the Alpha Jet and conduct flux measurements using SIERRA. The project includes comprehensive surveys of CO2 and CH4 concentrations, ambient data collection, and intricate soil profiling to understand microbial and gas interactions. Data collected during June 2011 highlight diurnal cycles and specific hotspot evaluations, contributing to ongoing research on desert environments' carbon uptake.

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Evaluation of Greenhouse Gases and Soil Microbiology at ARC Railroad Valley

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  1. ARC Railroad Valley 2011 • Provide data to support calibration of GOSAT • Explore local sources of CO2 and methane • Demonstrate greenhouse gas vertical profile measurement capability from Alpha Jet • Demonstrate flux measurements from SIERRA • SIERRA Team: • Surveys of CO2, CH4, 3-D winds • CO2 Vertical profiles • Ground-based Teams: • Ambient CO2, CH4, 3-D winds • Soil properties, gas samples, microbiology • Alpha Jet Team: • CO2, CH4, H2O, O3 Vertical profiles and transits to/from ARC

  2. CO2, CH4 Data Sets • Ground-based • mid-day at base camp under GOSAT overpasses: June 19, 20, 22, 23, 25, 26 • diurnal cycles • mobile sleuthing • SIERRA • June 17: CH4 playa survey • June 18: CH4 at springs and oil wells • June 20*: CO2 stacked circles at base camp • June 21*: CH4 oil well mapping • June 22: CO2 stacked circles at base camp • (*MMS data also available) • Alpha Jet • vertical profiles under GOSAT • June 22, 23, 25, 26

  3. SIERRA Highlights CO2 stacked circles mapping methane over playa mapping methane over springs mapping methane over oil wells

  4. Diurnal Variability • CO2 at ground level • noon on 6/20 through noon on 6/21 • drawdown overnight: uptake into soil • consistent with other desert environments; magnitude currently an open research question

  5. Soil and Microbiology Data Ground truthing for methane hotspots Kate Springs Bubble characteristics: CH4 = 84.32 ± 0.13 % C2H6= 7.88 ± 0.16 ppm C1/C2 = 105000 Sediment POC = 3.37 ± 0.8% Kate Springs

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