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Off the Shelf Commercial Compact FTS for CO 2 and CH 4 Observations for MRV

This study explores the use of Off the Shelf Commercial Compact Fourier Transform Spectrometers (FTS) for accurate regional column greenhouse gas (GHG) observations. The goal is to fill gaps in GHG observations in developing nations. The performance of the EM27/SUN spectrometer is compared with the Total Column Carbon Observing Network (TCCON) and other instruments to validate its accuracy. The study also highlights the potential applications of these observations for carbon cycle science and sink/source closure.

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Off the Shelf Commercial Compact FTS for CO 2 and CH 4 Observations for MRV

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  1. Off the Shelf Commercial Compact FTS for CO2 and CH4 Observations for MRV Rodica Lindenmaier, Zach Butterfield and Manvendra Dubey*, LANL Debra Wunch and Paul Wennberg, Caltech Frank Hase, KIT and Michael Gisi, Bruker Kim Strong, Univ. of Toronto PM: Ken Jucks NASA CMS Meeting Nov. 6 2013, JPL, Pasadenadubey@lanl.gov

  2. Atmospheric gas determination by solar absorption spectroscopy from ground (satellites use reflected sunlight) • Collect solar spectra through the atmospheric column. • Retrieve gases by spectral fits • O3 • CO2 • CH4 • N2O

  3. Currently accurate regional column GHG observations confined to developed nations: Gaps in India, China, Africa & S. America Total Column Carbon Observing Network (TCCON) High-Res Solar FTS, 0.02 cm-1, 20 ft Seatainer, Fixed, Expert Operators, ~$1M, 0.1% accurcay, validated by aircraft profiles, validates satellite retrievals (GOSAT, OCO-2) 4Corners (at LANL to Brazil)

  4. Exploit 1st Commercial EM27-Spectrometer/SUN: Order of magnitude smaller, cheaper, portable easier – low res. with undetermined sensitivity and stability • RockSolid™ pendulum FTIR-Spectrometer • Resolution: 0.5 cm-1 • Room temperatureInGaAs Detector • 470 x 630 x 350 cm • Mass: ~25 kg incl. tracker • $100K, Robust, Easy Operations

  5. Comparison of EM27/SUN performance with TCCON over a range of conditions (albedo, AOD, H2O) completed at 4C

  6. First Light: Comparison of spectral quality at Four Corners EM27/SUN 10 scans 0.5 cm-1 125HR, 1 scan 0.02 cm-1 CO2

  7. Promising First Results @ 4C: EM27 vs 125HR Using GGG

  8. Good Start, On Track and Path Forward • Exhaustive (CH4/CO2) GGG (Caltech) analysis of 4C spectra (1 month) • Comparisons with PROFFIT (KIT) retrieval • EM27/SUN Deployments at other TCCON sites • LANL (currently) • Caltech • Dryden • SGP Oklahoma • Wisconsin LEF • Eureka! and/or Poker Flats? • Other applications – spatial differences for fluxes • Integration within CMS, TCCON, OCO-2 USGCRP communities for carbon cycle science – sink and source closure and verification.

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