Caltech EM27/SUN FTS

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Version as of 21:33, 19 Sep 2020

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As of June 2014, more detailed infomation from this page has been moved to the private TCCON-wiki page. 

https://tccon-wiki.caltech.edu/Sites/Caltech/EM27

 

We anticipate using this mobile intrument in conjunction with TCCON instruments (e.g. the one at Caltech) to provide ground validation for and check for biases in OCO-2.   We also anticipating using this instrument to examine emissions of various gases from point locations and sources in the South Coast air Basin (SCB).

 

Specifications

Resolution: 0.5 cm-1

Geometric distance moved: 0.45 cm

Optical path difference: 1.8 cm

Range: ~40009000 cm-1

Gases measured: CO2, CH4, CO, H2O, N2O, O2

 

OCO-2 Validation

 

Because of the TCCON site at Caltech, Pasadena has frequently been targeted by OCO-2.  We have gone out several times (6+) to various places in Pasadena on OCO-2 targeted days.  In a single day we are able to make measurements at about 3 to 6 locations.  All of our equipment easily fits inside the back of a pickup truck.  Usually on these days we start and end by comparing with TCCON (see figure).

mobileFTS at Caltech.jpg


Measurements Around Emission Source

In January 2015 we hosted a mobile FTS campaign.  This campaign had 2 goals: 1) intercompare the mobile FT spectrometers and 2) measure emissions from a source in the SCB.  This campaign included participants from Caltech, JPL, LANL, and Harvard.  This was the first campaign of the mobile FT spectrometers in the U.S.  Overall we accomplished our goals, though every is working to provide the final versions of their data.  This campaign invovled work with 4 mobile FT spectrometers, 1 TCCON spectrometer, 2 picarro CRDS, and various meterological stations.