Articles | Volume 18, issue 4
https://doi.org/10.5194/acp-18-2835-2018
https://doi.org/10.5194/acp-18-2835-2018
Research article
 | 
28 Feb 2018
Research article |  | 28 Feb 2018

A 15-year record (2001–2015) of the ratio of nitrate to non-sea-salt sulfate in precipitation over East Asia

Syuichi Itahashi, Keiya Yumimoto, Itsushi Uno, Hiroshi Hayami, Shin-ichi Fujita, Yuepeng Pan, and Yuesi Wang

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AR by Syuichi Itahashi on behalf of the Authors (05 Jan 2018)  Author's response   Manuscript 
ED: Referee Nomination & Report Request started (09 Jan 2018) by Frank Dentener
RR by Wenche Aas (12 Jan 2018)
ED: Publish as is (22 Jan 2018) by Frank Dentener
AR by Syuichi Itahashi on behalf of the Authors (23 Jan 2018)
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Short summary
Ground-based observations of precipitation chemistry over China, Korea, and Japan from 2001 to 2015 were compiled, and the ratio of nitrate to non-sea-salt sulfate concentration in precipitation was analyzed to identify the long-term record of acidifying species. The variations in the ratio in East Asia corresponded to the NOx / SO2 emission ratio and the NO2 / SO2 column ratio in China. The results indicated that the acidity of precipitation shifted from sulfur to nitrogen.
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