Sources and Regional Attributions to Upper Troposphere Nitrogen Oxides During the Asian Summer Monsoon 2022

Jun Zhang; Douglas Kinnison; Louisa Emmons; Shawn Honomichl; Warren P. Smith; Simone Tilmes; Xinyue Wang; Alessandro Franchin; Frank Flocke; Laura L. Pan

doi:10.1029/2024GL114265

Sources and Regional Attributions to Upper Troposphere Nitrogen Oxides During the Asian Summer Monsoon 2022

Jun Zhang
, Douglas Kinnison
, Louisa Emmons
, Shawn Honomichl
, Warren P. Smith
, Simone Tilmes
, Xinyue Wang
, Alessandro Franchin
, Frank Flocke
, Laura L. Pan

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

This study investigates the sources and regional attributions of nitrogen oxides (NO_x) in the upper troposphere|upper tropospheric (UT) during the Asian Summer Monsoon (ASM). The importance of South Asia (SA) and East Asia (EA) contributions is the subject of main interest. Using artificial tracers in a chemistry-climate model, simulations with tracers from surface anthropogenic and lightning sources in SA and EA are conducted. Model results are validated with airborne observations from the Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) campaign in 2022 over the West Pacific. Good agreement between modeled and observed NO_x is found in the UT. The results indicate that within the ASM anticyclone, both SA and EA sources significantly contribute to the UT NOx, with contributions of 41% and 36%, respectively. While in the ACCLIP region during 2022, EA sources play a more important role, accounting for 50% compared to 19% from SA sources.

Original language	English
Article number	e2024GL114265
Journal	Geophysical Research Letters
Volume	52
Issue number	7
DOIs	https://doi.org/10.1029/2024GL114265
State	Published - Apr 16 2025
Externally published	Yes

Keywords

Asian summer monsoon
nitrogen oxides
upper troposphere

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10.1029/2024GL114265

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@article{49a60e386e1a4dccb03f65d6b97cb442,

title = "Sources and Regional Attributions to Upper Troposphere Nitrogen Oxides During the Asian Summer Monsoon 2022",

abstract = "This study investigates the sources and regional attributions of nitrogen oxides (NOx) in the upper troposphere|upper tropospheric (UT) during the Asian Summer Monsoon (ASM). The importance of South Asia (SA) and East Asia (EA) contributions is the subject of main interest. Using artificial tracers in a chemistry-climate model, simulations with tracers from surface anthropogenic and lightning sources in SA and EA are conducted. Model results are validated with airborne observations from the Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) campaign in 2022 over the West Pacific. Good agreement between modeled and observed NOx is found in the UT. The results indicate that within the ASM anticyclone, both SA and EA sources significantly contribute to the UT NOx, with contributions of 41\% and 36\%, respectively. While in the ACCLIP region during 2022, EA sources play a more important role, accounting for 50\% compared to 19\% from SA sources.",

keywords = "Asian summer monsoon, nitrogen oxides, upper troposphere",

author = "Jun Zhang and Douglas Kinnison and Louisa Emmons and Shawn Honomichl and Smith, \{Warren P.\} and Simone Tilmes and Xinyue Wang and Alessandro Franchin and Frank Flocke and Pan, \{Laura L.\}",

note = "Publisher Copyright: {\textcopyright} 2025. The Author(s).",

year = "2025",

month = apr,

day = "16",

doi = "10.1029/2024GL114265",

language = "English",

volume = "52",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley and Sons Inc.",

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}

TY - JOUR

T1 - Sources and Regional Attributions to Upper Troposphere Nitrogen Oxides During the Asian Summer Monsoon 2022

AU - Zhang, Jun

AU - Kinnison, Douglas

AU - Emmons, Louisa

AU - Honomichl, Shawn

AU - Smith, Warren P.

AU - Tilmes, Simone

AU - Wang, Xinyue

AU - Franchin, Alessandro

AU - Flocke, Frank

AU - Pan, Laura L.

PY - 2025/4/16

Y1 - 2025/4/16

N2 - This study investigates the sources and regional attributions of nitrogen oxides (NOx) in the upper troposphere|upper tropospheric (UT) during the Asian Summer Monsoon (ASM). The importance of South Asia (SA) and East Asia (EA) contributions is the subject of main interest. Using artificial tracers in a chemistry-climate model, simulations with tracers from surface anthropogenic and lightning sources in SA and EA are conducted. Model results are validated with airborne observations from the Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) campaign in 2022 over the West Pacific. Good agreement between modeled and observed NOx is found in the UT. The results indicate that within the ASM anticyclone, both SA and EA sources significantly contribute to the UT NOx, with contributions of 41% and 36%, respectively. While in the ACCLIP region during 2022, EA sources play a more important role, accounting for 50% compared to 19% from SA sources.

AB - This study investigates the sources and regional attributions of nitrogen oxides (NOx) in the upper troposphere|upper tropospheric (UT) during the Asian Summer Monsoon (ASM). The importance of South Asia (SA) and East Asia (EA) contributions is the subject of main interest. Using artificial tracers in a chemistry-climate model, simulations with tracers from surface anthropogenic and lightning sources in SA and EA are conducted. Model results are validated with airborne observations from the Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) campaign in 2022 over the West Pacific. Good agreement between modeled and observed NOx is found in the UT. The results indicate that within the ASM anticyclone, both SA and EA sources significantly contribute to the UT NOx, with contributions of 41% and 36%, respectively. While in the ACCLIP region during 2022, EA sources play a more important role, accounting for 50% compared to 19% from SA sources.

KW - Asian summer monsoon

KW - nitrogen oxides

KW - upper troposphere

UR - https://www.scopus.com/pages/publications/105002149206

U2 - 10.1029/2024GL114265

DO - 10.1029/2024GL114265

M3 - Article

AN - SCOPUS:105002149206

SN - 0094-8276

VL - 52

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 7

M1 - e2024GL114265

ER -

Sources and Regional Attributions to Upper Troposphere Nitrogen Oxides During the Asian Summer Monsoon 2022

Abstract

Keywords

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