Asian Summer Monsoon Anticyclone—The Primary Entryway for Chlorinated Very-Short-Lived Substances to the Stratosphere

Qing Liang; Paul A. Newman; Eric L. Fleming; Leslie R. Lait; Elliot Atlas; Laura Pan; Doug Kinnison; Luke M. Western; Sue Schauffler; Katie Smith; Victoria Treadaway; Roger Hendershot; Stephen Donnelly; Richard Lueb

doi:10.1029/2024GL110248

Asian Summer Monsoon Anticyclone—The Primary Entryway for Chlorinated Very-Short-Lived Substances to the Stratosphere

Qing Liang
, Paul A. Newman
, Eric L. Fleming
, Leslie R. Lait
, Elliot Atlas
, Laura Pan
, Doug Kinnison
, Luke M. Western
, Sue Schauffler
, Katie Smith
, Victoria Treadaway
, Roger Hendershot
, Stephen Donnelly
, Richard Lueb

ACOM Modeling

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

2 Scopus citations

Abstract

Rapid growing emissions of dichloromethane (CH₂Cl₂), a chlorinated very-short-lived substance (Cl-VSLS) and an ozone depleting substance (ODS), has raised concerns as this increase offset a part of the stratospheric chlorine (Cl) reduction due to decreasing long-lived ODSs. We have combined simulations of the two most abundant Cl-VSLSs, CH₂Cl₂ and chloroform (CHCl₃) using the NASA GEOS Chemistry Climate Model (GEOSCCM) with Asian Summer Monsoon Chemical and CLimate Impact Project aircraft observations to examine transport of Cl-VSLSs to the stratosphere and to assess their contribution to total stratospheric Cl. With ongoing large emissions (total ∼1,500 Gg yr⁻¹), Cl-VSLSs add about 100 ppt Cl to the stratosphere between 2020 and 2022. The Asian Summer Monsoon plays a primary role in the troposphere-to-stratosphere transport of Cl-VSLSs and delivers double the amount to the stratosphere, about 200 ppt Cl in August 2022. The overall Cl-VSLSs impact on stratospheric chlorine (∼3.3%) and ozone (∼1 DU) remain small.

Original language	English
Article number	e2024GL110248
Number of pages	10
Journal	Geophysical Research Letters
Volume	52
Issue number	3
DOIs	https://doi.org/10.1029/2024GL110248
State	Published - Feb 16 2025

Funding

This work was supported by NASA's Modeling, Analysis, and Prediction program and Upper Atmospheric Composition Observation program. Supercomputing resources for GEOSCCM were provided by the NASA High-End Computing (HEC) Program through the Advanced Supercomputing (NAS) Facility and NASA Center for Climate Simulation (NCCS). EL, SS, KS, VT, RH, SD, and RL acknowledge funding by NASA Grant 80NSSC22K1284 and NSF Grant AGS1853948.

Funders	Funder number
NASA
NASA's Modeling, Analysis, and Prediction program and Upper Atmospheric Composition Observation program
NASA High-End Computing (HEC) Program through the Advanced Supercomputing
NASA Center for Climate Simulation (NCCS)
NSF	AGS1853948
???publication-publication-funding-organisation-not-added???	80NSSC22K1284

Keywords

ACCLIP
Asian summer monsoon
chlorine
dichloromethane
stratosphere
very-short-lived substances
Chlorine
Dichloromethane
Stratosphere
Very-short-lived substances
Acclip

Access to Document

10.1029/2024GL110248

Cite this

Liang, Q., Newman, P. A., Fleming, E. L., Lait, L. R., Atlas, E., Pan, L., Kinnison, D., Western, L. M., Schauffler, S., Smith, K., Treadaway, V., Hendershot, R., Donnelly, S., & Lueb, R. (2025). Asian Summer Monsoon Anticyclone—The Primary Entryway for Chlorinated Very-Short-Lived Substances to the Stratosphere. Geophysical Research Letters, 52(3), Article e2024GL110248. https://doi.org/10.1029/2024GL110248

@article{adca746f8a554bb59b93a20a312daea9,

title = "Asian Summer Monsoon Anticyclone—The Primary Entryway for Chlorinated Very-Short-Lived Substances to the Stratosphere",

abstract = "Rapid growing emissions of dichloromethane (CH2Cl2), a chlorinated very-short-lived substance (Cl-VSLS) and an ozone depleting substance (ODS), has raised concerns as this increase offset a part of the stratospheric chlorine (Cl) reduction due to decreasing long-lived ODSs. We have combined simulations of the two most abundant Cl-VSLSs, CH2Cl2 and chloroform (CHCl3) using the NASA GEOS Chemistry Climate Model (GEOSCCM) with Asian Summer Monsoon Chemical and CLimate Impact Project aircraft observations to examine transport of Cl-VSLSs to the stratosphere and to assess their contribution to total stratospheric Cl. With ongoing large emissions (total ∼1,500 Gg yr−1), Cl-VSLSs add about 100 ppt Cl to the stratosphere between 2020 and 2022. The Asian Summer Monsoon plays a primary role in the troposphere-to-stratosphere transport of Cl-VSLSs and delivers double the amount to the stratosphere, about 200 ppt Cl in August 2022. The overall Cl-VSLSs impact on stratospheric chlorine (∼3.3\%) and ozone (∼1 DU) remain small.",

keywords = "ACCLIP, Asian summer monsoon, chlorine, dichloromethane, stratosphere, very-short-lived substances, Chlorine, Dichloromethane, Stratosphere, Very-short-lived substances, Acclip",

author = "Qing Liang and Newman, \{Paul A.\} and Fleming, \{Eric L.\} and Lait, \{Leslie R.\} and Elliot Atlas and Laura Pan and Doug Kinnison and Western, \{Luke M.\} and Sue Schauffler and Katie Smith and Victoria Treadaway and Roger Hendershot and Stephen Donnelly and Richard Lueb",

note = "Publisher Copyright: Published 2025. This article is a U.S. Government work and is in the public domain in the USA.",

year = "2025",

month = feb,

day = "16",

doi = "10.1029/2024GL110248",

language = "English",

volume = "52",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley and Sons Inc.",

number = "3",

}

Liang, Q, Newman, PA, Fleming, EL, Lait, LR, Atlas, E, Pan, L, Kinnison, D, Western, LM, Schauffler, S, Smith, K, Treadaway, V, Hendershot, R, Donnelly, S & Lueb, R 2025, 'Asian Summer Monsoon Anticyclone—The Primary Entryway for Chlorinated Very-Short-Lived Substances to the Stratosphere', Geophysical Research Letters, vol. 52, no. 3, e2024GL110248. https://doi.org/10.1029/2024GL110248

TY - JOUR

T1 - Asian Summer Monsoon Anticyclone—The Primary Entryway for Chlorinated Very-Short-Lived Substances to the Stratosphere

AU - Liang, Qing

AU - Newman, Paul A.

AU - Fleming, Eric L.

AU - Lait, Leslie R.

AU - Atlas, Elliot

AU - Pan, Laura

AU - Kinnison, Doug

AU - Western, Luke M.

AU - Schauffler, Sue

AU - Smith, Katie

AU - Treadaway, Victoria

AU - Hendershot, Roger

AU - Donnelly, Stephen

AU - Lueb, Richard

N1 - Publisher Copyright: Published 2025. This article is a U.S. Government work and is in the public domain in the USA.

PY - 2025/2/16

Y1 - 2025/2/16

N2 - Rapid growing emissions of dichloromethane (CH2Cl2), a chlorinated very-short-lived substance (Cl-VSLS) and an ozone depleting substance (ODS), has raised concerns as this increase offset a part of the stratospheric chlorine (Cl) reduction due to decreasing long-lived ODSs. We have combined simulations of the two most abundant Cl-VSLSs, CH2Cl2 and chloroform (CHCl3) using the NASA GEOS Chemistry Climate Model (GEOSCCM) with Asian Summer Monsoon Chemical and CLimate Impact Project aircraft observations to examine transport of Cl-VSLSs to the stratosphere and to assess their contribution to total stratospheric Cl. With ongoing large emissions (total ∼1,500 Gg yr−1), Cl-VSLSs add about 100 ppt Cl to the stratosphere between 2020 and 2022. The Asian Summer Monsoon plays a primary role in the troposphere-to-stratosphere transport of Cl-VSLSs and delivers double the amount to the stratosphere, about 200 ppt Cl in August 2022. The overall Cl-VSLSs impact on stratospheric chlorine (∼3.3%) and ozone (∼1 DU) remain small.

AB - Rapid growing emissions of dichloromethane (CH2Cl2), a chlorinated very-short-lived substance (Cl-VSLS) and an ozone depleting substance (ODS), has raised concerns as this increase offset a part of the stratospheric chlorine (Cl) reduction due to decreasing long-lived ODSs. We have combined simulations of the two most abundant Cl-VSLSs, CH2Cl2 and chloroform (CHCl3) using the NASA GEOS Chemistry Climate Model (GEOSCCM) with Asian Summer Monsoon Chemical and CLimate Impact Project aircraft observations to examine transport of Cl-VSLSs to the stratosphere and to assess their contribution to total stratospheric Cl. With ongoing large emissions (total ∼1,500 Gg yr−1), Cl-VSLSs add about 100 ppt Cl to the stratosphere between 2020 and 2022. The Asian Summer Monsoon plays a primary role in the troposphere-to-stratosphere transport of Cl-VSLSs and delivers double the amount to the stratosphere, about 200 ppt Cl in August 2022. The overall Cl-VSLSs impact on stratospheric chlorine (∼3.3%) and ozone (∼1 DU) remain small.

KW - ACCLIP

KW - Asian summer monsoon

KW - chlorine

KW - dichloromethane

KW - stratosphere

KW - very-short-lived substances

KW - Chlorine

KW - Dichloromethane

KW - Stratosphere

KW - Very-short-lived substances

KW - Acclip

UR - https://www.scopus.com/pages/publications/85216941708

U2 - 10.1029/2024GL110248

DO - 10.1029/2024GL110248

M3 - Article

AN - SCOPUS:85216941708

SN - 0094-8276

VL - 52

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 3

M1 - e2024GL110248

ER -

Asian Summer Monsoon Anticyclone—The Primary Entryway for Chlorinated Very-Short-Lived Substances to the Stratosphere

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this