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Off-the-shelf Commercial Compact Solar FTS for CO2 and CH4 MRV
Manvendra
K
Dubey, Los Alamos National Laboratory, dubey@lanl.gov
(Presenter)
Recent studies demonstrate that satellite and ground based observations of column CH4 and CO2 can be used to verify their fluxes to correct bottom up inventories. Ground based Total Column Carbon Observing Network (TCCON) measurements and satellite observations (SCIAMACHY, GOSAT and OCO-2) are providing data to achieve verification. Unfortunately due to the large size, high cost and complexity of TCCON that uses a high resolution solar Fourier Transform Spectrometer (Bruker 125HR) its coverage is confined to the developed world. Our goal is to fill gaps in the TCCON in the developing regions in Asia, South America and Africa. To achieve this we acquired the first commercial low resolution solar FTS with an inbuilt camtracker (EM27/SUN). The EM27 is compact, inexpensive, mobile and easy to operate. We compared the performance of the EM27 in side-by-side deployments at 3 TCCON (125HR) sites their standard retrievals. They included a power plant (Four Corners, NM), urban (Caltech), remote mountain (Los Alamos, NM) and coastal (Armstrong, CA). Comparisons of changes in diurnal CH4 and CO2 the EM27 with the 125HR TCCON are good and promising in a diverse set of environments. However, there is a 20 ppb high bias in EM27. Our system was calibrated in the factory in Germany and has experienced international shipment. It has been driven extensively from Los Alamos to Four Corners and Los Angeles for 4 campaigns over a period of 1 year. Given this the EM27 appears to have good stability. However, more careful analysis of the Instrument Line Shape and its long-term stability are needed and calibration and operational protocols are being developed at KIT as part of the proposed Collaborative Column Carbon Observing Network (COCCON). We plan to perform campaigns at other TCCON sites in Lamont OK, Park Falls WI and possibly Eureka, Canada in 2015. Associated Project(s):
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