EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Inverse analysis of fire-induced carbon emission from Equatorial Asia in 2015 with CONTRAIL and NIES-VOS data

Yosuke Niwa1,2, Yousuke Sawa3, Hideki Nara1, Toshinobu Machida1, Hidekazu Matsueda4, Taku Umezawa1, Akihiko Ito1, Shin-Ichiro Nakaoka1, Hiroshi Tanimoto1, and Yasunori Tohjima1
Yosuke Niwa et al.
  • 1National Institute for Environmental Studies, Center for Global Environmental Research, Tsukuba, Japan (
  • 2Meteorological Research Institute, Tsukuba, Japan
  • 3Japan Meteorological Agency, Tokyo, Japan
  • 4Dokkyo University, Soka, Japan

The fire-induced carbon emission in Equatorial Asia was estimated using the inverse system named NICAM-based Inverse Simulation for Monitoring (NISMON) carbon dioxide (CO2). The analysis was performed with the four-dimensional variational method for 2015, when the big El Niño was occurred. NISMON-CO2 extensively used high-precision atmospheric mole fraction data of CO2 from the commercial aircraft observation project of Comprehensive Observation Network for TRace gases by AIrLiner (CONTRAIL). Furthermore, independent atmospheric CO2 and carbon monoxide data from National Institute for Environmental Studies (NIES) Volunteer Observing Ship (VOS) Programme were used to elucidate the validity of the estimated fire-induced carbon emission. Finally, using both CONTRAIL and NIES-VOS CO2 data, the inverse analysis indicated 273 Tg C for fire emission during September - October 2015. This two-month-long emission accounts for 75% of the annual total fire emission and 45% of the annual total net carbon flux within the region, indicating that fire emission is a dominant driving force of interannual variations of carbon fluxes in Equatorial Asia. In the future warmer climate condition, Equatorial Asia would experience more severe droughts and have risks for releasing a large amount of carbon into the atmosphere. Therefore, the continuation of these aircraft and shipboard observations is fruitful for reliable monitoring of carbon fluxes in Equatorial Asia.

How to cite: Niwa, Y., Sawa, Y., Nara, H., Machida, T., Matsueda, H., Umezawa, T., Ito, A., Nakaoka, S.-I., Tanimoto, H., and Tohjima, Y.: Inverse analysis of fire-induced carbon emission from Equatorial Asia in 2015 with CONTRAIL and NIES-VOS data, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-7005,, 2021.


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