Preprints
https://doi.org/10.5194/acp-2022-46
https://doi.org/10.5194/acp-2022-46
 
18 Feb 2022
18 Feb 2022
Status: this preprint is currently under review for the journal ACP.

Carbon dioxide variations in the upper troposphere and lower stratosphere from GOSAT TANSO-FTS TIR profile data

Akihiro Honda1,a, Nawo Eguchi2, and Naoko Saitoh3 Akihiro Honda et al.
  • 1Interdisciplinary Graduate School of Engineering and Sciences, Kyushu University, Kasuga Park 6-1, Kasuga, Fukuoka, Japan
  • 2Research Institute for Applied Mechanics (RIAM), Kyushu University, Kasuga Park 6-1, Kasuga, Fukuoka, Japan
  • 3Center for Environmental Remote Sensing, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba, Japan
  • anow at: Mitsubishi Heavy Industries Ltd.

Abstract. Carbon dioxide (CO2) variations in the upper troposphere and lower stratosphere (UT and LS; pressure = 300–70 hPa) were investigated with profile data derived from the thermal infrared region (Band 4: 5.5–14.3 μm) of the Thermal And Near-infrared Sensor for carbon Observation (TANSO)–Fourier Transform Spectrometer (FTS) onboard the Greenhouse gas Observing SATellite (GOSAT). The vertical profile data (Level 2; version 1) of CO2 mixing ratios were obtained by bias correction using the in situ aircraft data. Data with sufficient sensitivity were used for the analysis by selecting values with higher degrees of freedom. The analysis period is over four years from January 2010 to December 2013.

The increase of CO2 mixing ratios obtained with the bias correction in the UT and LS was 1.8–2.4 ppmv year−1 from 2010–2013, which is consistent with a previous observational study and almost the same as for the lower troposphere (LT). The seasonal variations in the UT and LS show that a maximum peak exists one or two months after the peak in the LT, and has an amplitude of 4–5 ppmv, which is less than that in the LT. The inter-annual variations observed in the tropical UT appear to be affected by ENSO events; higher (lower) CO2 mixing ratios were observed during La Niña (normal/El Niño) periods. Intra-seasonal variations over the Asian summer monsoon region were associated with both vertical and horizontal motions owing to deep convection and monsoonal anticyclonic circulation, respectively.

Akihiro Honda et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-46', Xiaozhen Xiong, 29 Mar 2022
  • RC2: 'Comment on acp-2022-46', Anonymous Referee #2, 26 May 2022

Akihiro Honda et al.

Akihiro Honda et al.

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Short summary
The intra-seasonal, seasonal and inter-annual variations of carbon dioxide (CO2) at the upper troposphere and lower stratosphere (UTLS) are investigated by the CO2 profile data derived from the thermal infrared spectra of TANSO-FTS instrument onboard GOSAT satellite, for understanding of the missing sink of CO2 and detail exchange process between UT and LS. There are new findings on the intra-seasonal and inter-annual variations associated with Asian summer monsoon and ENSO, respectively.
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