Articles | Volume 11, issue 4
Atmos. Meas. Tech., 11, 2361–2374, 2018
Atmos. Meas. Tech., 11, 2361–2374, 2018
Research article
25 Apr 2018
Research article | 25 Apr 2018

Characteristics of greenhouse gas concentrations derived from ground-based FTS spectra at Anmyeondo, South Korea

Young-Suk Oh1,2, S. Takele Kenea1, Tae-Young Goo1, Kyu-Sun Chung2, Jae-Sang Rhee1, Mi-Lim Ou6, Young-Hwa Byun1, Paul O. Wennberg4,5, Matthäus Kiel4, Joshua P. DiGangi7, Glenn S. Diskin7, Voltaire A. Velazco3, and David W. T. Griffith3 Young-Suk Oh et al.
  • 1Climate Research Division, National Institute of Meteorological Sciences (NIMS), Jeju-do, Republic of Korea
  • 2Department of Electrical Eng. & Centre for Edge Plasma Science, Hanyang University, Seoul, Republic of Korea
  • 3School of Chemistry, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
  • 4Division of Geological and Planetary Sciences, California Institute of Technology, 1200E. California Boulevard, Pasadena, CA, 91125, USA
  • 5Division of Engineering and Applied Sciences, California Institute of Technology, 1200E. California Boulevard, Pasadena, CA, 91125, USA
  • 6Climate Change Monitoring Division, Korea Meteorological Administration, Seoul, Republic of Korea
  • 7NASA Langley Research Center Building 1250, Mail Stop 401A Hampton, VA, 23681, USA

Abstract. Since the late 1990s, the meteorological observatory established in Anmyeondo (36.5382° N, 126.3311° E, and 30 m above mean sea level) has been monitoring several greenhouse gases such as CO2, CH4, N2O, CFCs, and SF6 as a part of the Global Atmosphere Watch (GAW) Program. A high resolution ground-based (g-b) Fourier transform spectrometer (FTS) was installed at this observation site in 2013 and has been operated within the frame work of the Total Carbon Column Observing Network (TCCON) since August 2014. The solar spectra recorded by the g-b FTS cover the spectral range 3800 to 16 000 cm−1 at a resolution of 0.02 cm−1. In this work, the GGG2014 version of the TCCON standard retrieval algorithm was used to retrieve total column average CO2 and CH4 dry mole fractions (XCO2, XCH4) and from the FTS spectra. Spectral bands of CO2 (at 6220.0 and 6339.5 cm−1 center wavenumbers, CH4 at 6002 cm−1 wavenumber, and O2 near 7880 cm−1 ) were used to derive the XCO2 and XCH4. In this paper, we provide comparisons of XCO2 and XCH4 between the aircraft observations and g-b FTS over Anmyeondo station. A comparison of 13 coincident observations of XCO2 between g-b FTS and OCO-2 (Orbiting Carbon Observatory) satellite measurements are also presented for the measurement period between February 2014 and November 2017. OCO-2 observations are highly correlated with the g-b FTS measurements (r2 = 0.884) and exhibited a small positive bias (0.189 ppm). Both data set capture seasonal variations of the target species with maximum and minimum values in spring and late summer, respectively. In the future, it is planned to further utilize the FTS measurements for the evaluation of satellite observations such as Greenhouse Gases Observing Satellite (GOSAT, GOSAT-2). This is the first report of the g-b FTS observations of XCO2 species over the Anmyeondo station.

Short summary
We focused on the measurements taken during the period of February 2014 to November 2017. The FTS instrument was stable during the whole measurement period. The g-b FTS retrieval of XCO2 and XCH4 were compared with aircraft measurements that were conducted over Anmyeondo station on 22 May 2016, 29 October, and 12 November 2017. The preliminary comparison results of XCO2 between FTS and OCO-2 were also presented over the Anmyeondo station.