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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-49
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-49
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Apr 2019

Research article | 30 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Atmospheric ammonia retrieval from the TANSO-FTS/GOSAT thermal infrared sounder

Yu Someya1, Ryoichi Imasu2, Kei Shiomi3, and Naoko Saitoh4 Yu Someya et al.
  • 1Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan
  • 2Atmosphere and Ocean Research Institute, the University of Tokyo, Chiba, Japan
  • 3Japan Aerospace Exploration Agency, Tsukuba, Japan
  • 4Center for Environmental Remote Sensing, Chiba University, Chiba, Japan

Abstract. Hyperspectral thermal infrared sounders enable us to grasp the global behavior of minor atmospheric constituents. Ammonia, which imparts large impacts on the atmospheric environment by reacting with other species, is one of them. In this work, we present an ammonia retrieval system that we developed for the Greenhouse Gases Observing Satellite (GOSAT) and the estimates of global atmospheric ammonia concentrations that we derived from 2009 to 2014. The horizontal distributions of the seasonal columnar ammonia concentrations represent significantly high concentrations stemming from six anthropogenic emission source areas and four biomass burning ones. The monthly mean time series of these sites were investigated, and their seasonality was clearly revealed. A comparison with the Infrared Atmospheric Sounding Interferometer (IASI) ammonia product showed a good agreement spatially and seasonally, though there are some differences in detail. The values from GOSAT tend to be slightly larger than those from the IASI for low concentrations, especially in spring and summer. On the other hand, they are lower for particularly high concentrations during summer, such as Eastern China and Northern India. In addition, the largest differences were observed in central Africa. These differences seem to stem from the temporal gaps in observations and the fundamental differences in the retrieval systems.

Yu Someya et al.
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Short summary
This study presents a novel ammonia retrieval system we developed GOSAT. This system was used to derive estimates of global atmospheric ammonia concentrations between 2009 and 2014. The results demonstrated significantly high concentrations stemming from six anthropogenic emission source areas and four biomass burning ones. Their horizontal and temporal distributions were compared with those from IASI. They were totally consistent and the causes of the differences were discussed.
This study presents a novel ammonia retrieval system we developed GOSAT. This system was used to...
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