Weaker cooling by aerosols due to dust–pollution interactions

Klaus Klingmüller; Vlassis A. Karydis; Sara Bacer; Georgiy L. Stenchikov; Jos Lelieveld

doi:10.5194/acp-20-15285-2020

Weaker cooling by aerosols due to dust–pollution interactions

Klaus Klingmüller, Vlassis A. Karydis, Sara Bacer, Georgiy L. Stenchikov, Jos Lelieveld

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Abstract

Abstract. The interactions between aeolian dust and anthropogenic air pollution, notably chemical ageing of mineral dust and coagulation of dust and pollution particles, modify the atmospheric aerosol composition and burden. Since the aerosol particles can act as cloud condensation nuclei, this affects the radiative transfer not only directly via aerosol–radiation interactions, but also indirectly through cloud adjustments. We study both radiative effects using the global ECHAM/MESSy atmospheric chemistry-climate model (EMAC) which combines the Modular Earth Submodel System (MESSy) with the European Centre/Hamburg (ECHAM) climate model. Our simulations show that dust–pollution–cloud interactions reduce the condensed water path and hence the reflection of solar radiation. The associated climate warming outweighs the cooling that the dust–pollution interactions exert through the direct radiative effect. In total, this results in a net warming by dust–pollution interactions which moderates the negative global anthropogenic aerosol forcing at the top of the atmosphere by (0.2 ± 0.1) W m−2.

Original language	English (US)
Pages (from-to)	15285-15295
Number of pages	11
Journal	Atmospheric Chemistry and Physics
Volume	20
Issue number	23
DOIs	https://doi.org/10.5194/acp-20-15285-2020
State	Published - Dec 9 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-12-16
Acknowledgements: This research has been supported by the King Abdullah University of Science and Technology (grant CRG3, grant no. URF/1/2180-01-01).

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https://repository.kaust.edu.sa/bitstream/10754/663959/3/weaker%20cooling.pdf

Cite this

@article{4a6bf99f5b7a46cbad1077773b3b362e,

title = "Weaker cooling by aerosols due to dust–pollution interactions",

abstract = "Abstract. The interactions between aeolian dust and anthropogenic air pollution, notably chemical ageing of mineral dust and coagulation of dust and pollution particles, modify the atmospheric aerosol composition and burden. Since the aerosol particles can act as cloud condensation nuclei, this affects the radiative transfer not only directly via aerosol–radiation interactions, but also indirectly through cloud adjustments. We study both radiative effects using the global ECHAM/MESSy atmospheric chemistry-climate model (EMAC) which combines the Modular Earth Submodel System (MESSy) with the European Centre/Hamburg (ECHAM) climate model. Our simulations show that dust–pollution–cloud interactions reduce the condensed water path and hence the reflection of solar radiation. The associated climate warming outweighs the cooling that the dust–pollution interactions exert through the direct radiative effect. In total, this results in a net warming by dust–pollution interactions which moderates the negative global anthropogenic aerosol forcing at the top of the atmosphere by (0.2 ± 0.1) W m−2.",

author = "Klaus Klingm{\"u}ller and Karydis, {Vlassis A.} and Sara Bacer and Stenchikov, {Georgiy L.} and Jos Lelieveld",

note = "KAUST Repository Item: Exported on 2020-12-16 Acknowledgements: This research has been supported by the King Abdullah University of Science and Technology (grant CRG3, grant no. URF/1/2180-01-01).",

year = "2020",

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doi = "10.5194/acp-20-15285-2020",

language = "English (US)",

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TY - JOUR

T1 - Weaker cooling by aerosols due to dust–pollution interactions

AU - Klingmüller, Klaus

AU - Karydis, Vlassis A.

AU - Bacer, Sara

AU - Stenchikov, Georgiy L.

AU - Lelieveld, Jos

N1 - KAUST Repository Item: Exported on 2020-12-16 Acknowledgements: This research has been supported by the King Abdullah University of Science and Technology (grant CRG3, grant no. URF/1/2180-01-01).

PY - 2020/12/9

Y1 - 2020/12/9

N2 - Abstract. The interactions between aeolian dust and anthropogenic air pollution, notably chemical ageing of mineral dust and coagulation of dust and pollution particles, modify the atmospheric aerosol composition and burden. Since the aerosol particles can act as cloud condensation nuclei, this affects the radiative transfer not only directly via aerosol–radiation interactions, but also indirectly through cloud adjustments. We study both radiative effects using the global ECHAM/MESSy atmospheric chemistry-climate model (EMAC) which combines the Modular Earth Submodel System (MESSy) with the European Centre/Hamburg (ECHAM) climate model. Our simulations show that dust–pollution–cloud interactions reduce the condensed water path and hence the reflection of solar radiation. The associated climate warming outweighs the cooling that the dust–pollution interactions exert through the direct radiative effect. In total, this results in a net warming by dust–pollution interactions which moderates the negative global anthropogenic aerosol forcing at the top of the atmosphere by (0.2 ± 0.1) W m−2.

AB - Abstract. The interactions between aeolian dust and anthropogenic air pollution, notably chemical ageing of mineral dust and coagulation of dust and pollution particles, modify the atmospheric aerosol composition and burden. Since the aerosol particles can act as cloud condensation nuclei, this affects the radiative transfer not only directly via aerosol–radiation interactions, but also indirectly through cloud adjustments. We study both radiative effects using the global ECHAM/MESSy atmospheric chemistry-climate model (EMAC) which combines the Modular Earth Submodel System (MESSy) with the European Centre/Hamburg (ECHAM) climate model. Our simulations show that dust–pollution–cloud interactions reduce the condensed water path and hence the reflection of solar radiation. The associated climate warming outweighs the cooling that the dust–pollution interactions exert through the direct radiative effect. In total, this results in a net warming by dust–pollution interactions which moderates the negative global anthropogenic aerosol forcing at the top of the atmosphere by (0.2 ± 0.1) W m−2.

UR - http://hdl.handle.net/10754/663959

UR - https://acp.copernicus.org/articles/20/15285/2020/

U2 - 10.5194/acp-20-15285-2020

DO - 10.5194/acp-20-15285-2020

M3 - Article

SN - 1680-7324

VL - 20

SP - 15285

EP - 15295

JO - Atmospheric Chemistry and Physics

JF - Atmospheric Chemistry and Physics

IS - 23

ER -

Weaker cooling by aerosols due to dust–pollution interactions

Abstract

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