A41I-0162
GOSAT CO2 and CH4 validation activity with a portable FTS at Pasadena, Chino, and Railroad Valley

Thursday, 17 December 2015
Poster Hall (Moscone South)
Kei Shiomi1, Akihiko Kuze2, Hiroshi Suto3, Shuji Kawakami3, Fumie Kataoka4, Jacob Hedelius5, Camille Viatte5, Paul O Wennberg6, Debra Wunch5, Coleen Marie Roehl5, Ira Leifer7, Tomoaki Tanaka8, Laura T Iraci8, Carol J Bruegge9, Florian M Schwandner9 and David Crisp10, (1)Japan Aerospace Exploration Agency, Kanagawa, Japan, (2)JAXA Japan Aerospace Exploration Agency, EORC, Sagamihara, Japan, (3)JAXA Japan Aerospace Exploration Agency, Sagamihara, Japan, (4)RESTEC, Tsukuba, Japan, (5)California Institute of Technology, Pasadena, CA, United States, (6)California Institute of Technology, Division of Engineering and Applied Science, Pasadena, CA, United States, (7)University of California Santa Barbara, Santa Barbara, CA, United States, (8)NASA Ames Research Center, Moffett Field, CA, United States, (9)Jet Propulsion Laboratory, Pasadena, CA, United States, (10)NASA Jet Propulsion Laboratory, Pasadena, CA, United States
Abstract:
The column-average dry air mole fractions of carbon dioxide (XCO2) and methane (XCH4) were measured with a portable Fourier transform spectrometer (FTS), EM27/SUN, using direct sunlight at 1) Caltech, in Pasadena, a northern Los Angeles suburb, 2) Chino, a dairy region east of Los Angeles, and 3) Railroad Valley (RRV), a desert playa in Nevada. They were conducted during the GOSAT/OCO-2 joint campaign for vicarious calibration and validation (cal/val) and its preparatory experiments in June-July 2015.

JAXA’s GOSAT has been operating since 2009 to monitor the greenhouse gases XCO2 and XCH4 using surface-reflected sunlight from space. GOSAT carries a Fourier Transform Spectrometer (TANSO-FTS) and a Cloud and Aerosol Imager (TANSO-CAI). NASA’s OCO-2 has been operating since 2014, carries a grating spectrometer to make precise XCO2 observations with a-few-kilometer resolution. Their polar orbits have 12:46 pm (GOSAT) and 1:30 pm (OCO-2) observing times. For cal/val, these sites were targeted with coincident , near simultaneous ground-based and vertical profiling measurements.

These sites are different types of suburban, dairy, and desert areas. Before the campaign, measurements from the JAXA EM27/SUN were compared with those from the Total Carbon Column Observing Network (TCCON) and from the Caltech EM27/SUN at Pasadena. We compared the retrieved values and simultaneously observed diurnal enhancements by advection from the Los Angeles basin. Then, we observed a diurnal cycle at Chino dairy area, an area of concentrated husbandry, producing a CH4 point source. Finally, we conducted the cal/val campaign at RRV coincident with GOSAT and OCO-2 overpass observations. Over RRV, vertical profiles of CO2 and CH4 were measured using the Alpha Jet research aircraft as a part of the NASA Ames Alpha Jet Atmospheric eXperiment (AJAX) . We will compare experimental results from the cal/val campaign for XCO2 and XCH4 with a portable FTS.

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