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Title: Separating radiative forcing by aerosol–cloud interactions and rapid cloud adjustments in the ECHAM–HAMMOZ aerosol–climate model using the method of partial radiative perturbations

Abstract

Using the method of offline radiative transfer modeling within the partial radiative perturbation (PRP) approach, the effective radiative forcing by aerosol–cloud interactions (ERFaci) in the ECHAM–HAMMOZ aerosol climate model is decomposed into a radiative forcing by anthropogenic cloud droplet number change and adjustments of the liquid water path and cloud fraction.The simulated radiative forcing by anthropogenic cloud droplet number change and liquid water path adjustment are of approximately equal magnitude at –0.52 and –0.53 W m–2, respectively, while the cloud-fraction adjustment is somewhat weaker at –0.31 W m–2 (constituting 38 %, 39 %, and 23 %of the total ERFaci, respectively); geographically, all three ERFaci components in the simulation peak over China, the subtropical eastern ocean boundaries,the northern Atlantic and Pacific oceans, Europe, and eastern North America (in order of prominence). Spatial correlations indicate that the temporal-mean liquid water path adjustment is proportional to the temporal-mean radiative forcing, while the relationship between cloud-fraction adjustment and radiative forcing is less direct. While the estimate of warm-cloud ERFaci is relatively insensitive to the treatment of ice and mixed-phase cloud overlying warm cloud, there are indications that more restrictive treatments of ice in the column result in a low bias in the estimated magnitudemore » of the liquid water path adjustment and a high bias in the estimated magnitude of the droplet number forcing. Since the present work is the first PRP decomposition of the aerosol effective radiative forcing into radiative forcing and rapid cloud adjustments, idealized experiments are conducted to provide evidence that the PRP results are accurate. The experiments show that using low-frequency(daily or monthly) time-averaged model output of the cloud property fields underestimates the ERF, but 3-hourly mean output is sufficiently frequent.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [3]
+ Show Author Affiliations
  1. Univ. Leipzig, Leipzig (Germany); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Imperial College London, London (United Kingdom)
  3. Univ. Leipzig, Leipzig (Germany)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1580593
Report Number(s):
PNNL-SA-140892
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 19; Journal Issue: 24; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Mülmenstädt, Johannes, Gryspeerdt, Edward, Salzmann, Marc, Ma, Po -Lun, Dipu, Sudhakar, and Quaas, Johannes. Separating radiative forcing by aerosol–cloud interactions and rapid cloud adjustments in the ECHAM–HAMMOZ aerosol–climate model using the method of partial radiative perturbations. United States: N. p., 2019. Web. doi:10.5194/acp-19-15415-2019.
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Mülmenstädt, Johannes, Gryspeerdt, Edward, Salzmann, Marc, Ma, Po -Lun, Dipu, Sudhakar, & Quaas, Johannes. Separating radiative forcing by aerosol–cloud interactions and rapid cloud adjustments in the ECHAM–HAMMOZ aerosol–climate model using the method of partial radiative perturbations. United States. https://doi.org/10.5194/acp-19-15415-2019
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Mülmenstädt, Johannes, Gryspeerdt, Edward, Salzmann, Marc, Ma, Po -Lun, Dipu, Sudhakar, and Quaas, Johannes. Tue . "Separating radiative forcing by aerosol–cloud interactions and rapid cloud adjustments in the ECHAM–HAMMOZ aerosol–climate model using the method of partial radiative perturbations". United States. https://doi.org/10.5194/acp-19-15415-2019. https://www.osti.gov/servlets/purl/1580593.
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@article{osti_1580593,
title = {Separating radiative forcing by aerosol–cloud interactions and rapid cloud adjustments in the ECHAM–HAMMOZ aerosol–climate model using the method of partial radiative perturbations},
author = {Mülmenstädt, Johannes and Gryspeerdt, Edward and Salzmann, Marc and Ma, Po -Lun and Dipu, Sudhakar and Quaas, Johannes},
abstractNote = {Using the method of offline radiative transfer modeling within the partial radiative perturbation (PRP) approach, the effective radiative forcing by aerosol–cloud interactions (ERFaci) in the ECHAM–HAMMOZ aerosol climate model is decomposed into a radiative forcing by anthropogenic cloud droplet number change and adjustments of the liquid water path and cloud fraction.The simulated radiative forcing by anthropogenic cloud droplet number change and liquid water path adjustment are of approximately equal magnitude at –0.52 and –0.53 W m–2, respectively, while the cloud-fraction adjustment is somewhat weaker at –0.31 W m–2 (constituting 38 %, 39 %, and 23 %of the total ERFaci, respectively); geographically, all three ERFaci components in the simulation peak over China, the subtropical eastern ocean boundaries,the northern Atlantic and Pacific oceans, Europe, and eastern North America (in order of prominence). Spatial correlations indicate that the temporal-mean liquid water path adjustment is proportional to the temporal-mean radiative forcing, while the relationship between cloud-fraction adjustment and radiative forcing is less direct. While the estimate of warm-cloud ERFaci is relatively insensitive to the treatment of ice and mixed-phase cloud overlying warm cloud, there are indications that more restrictive treatments of ice in the column result in a low bias in the estimated magnitude of the liquid water path adjustment and a high bias in the estimated magnitude of the droplet number forcing. Since the present work is the first PRP decomposition of the aerosol effective radiative forcing into radiative forcing and rapid cloud adjustments, idealized experiments are conducted to provide evidence that the PRP results are accurate. The experiments show that using low-frequency(daily or monthly) time-averaged model output of the cloud property fields underestimates the ERF, but 3-hourly mean output is sufficiently frequent.},
doi = {10.5194/acp-19-15415-2019},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 24,
volume = 19,
place = {United States},
year = {Tue Dec 17 00:00:00 EST 2019},
month = {Tue Dec 17 00:00:00 EST 2019}
}
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text, January 2014

Cloud microphysics and aerosol indirect effects in the global climate model ECHAM5-HAM
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Cloud microphysics and aerosol indirect effects in the global climate model ECHAM5-HAM
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