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Title: Photolysis rates in correlated overlapping cloud fields: Cloud-J 7.3c

Abstract

Here, a new approach for modeling photolysis rates ( J values) in atmospheres with fractional cloud cover has been developed and is implemented as Cloud-J – a multi-scattering eight-stream radiative transfer model for solar radiation based on Fast-J. Using observations of the vertical correlation of cloud layers, Cloud-J 7.3c provides a practical and accurate method for modeling atmospheric chemistry. The combination of the new maximum-correlated cloud groups with the integration over all cloud combinations by four quadrature atmospheres produces mean J values in an atmospheric column with root mean square (rms) errors of 4 % or less compared with 10–20 % errors using simpler approximations. Cloud-J is practical for chemistry–climate models, requiring only an average of 2.8 Fast-J calls per atmosphere vs. hundreds of calls with the correlated cloud groups, or 1 call with the simplest cloud approximations. Another improvement in modeling J values, the treatment of volatile organic compounds with pressure-dependent cross sections, is also incorporated into Cloud-J.

Authors:
 [1]
  1. Univ. of California, Irvine, CA (United States). Earth System Science Dept.
Publication Date:
Research Org.:
Univ. of California, Irvine, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1210106
Alternate Identifier(s):
OSTI ID: 1454258
Grant/Contract Number:  
SC0012536; SC-0012536
Resource Type:
Published Article
Journal Name:
Geoscientific Model Development (Online)
Additional Journal Information:
Journal Name: Geoscientific Model Development (Online); Journal Volume: 8; Journal Issue: 8; Journal ID: ISSN 1991-9603
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Prather, M. J. Photolysis rates in correlated overlapping cloud fields: Cloud-J 7.3c. United States: N. p., 2015. Web. doi:10.5194/gmd-8-2587-2015.
Prather, M. J. Photolysis rates in correlated overlapping cloud fields: Cloud-J 7.3c. United States. doi:10.5194/gmd-8-2587-2015.
Prather, M. J. Fri . "Photolysis rates in correlated overlapping cloud fields: Cloud-J 7.3c". United States. doi:10.5194/gmd-8-2587-2015.
@article{osti_1210106,
title = {Photolysis rates in correlated overlapping cloud fields: Cloud-J 7.3c},
author = {Prather, M. J.},
abstractNote = {Here, a new approach for modeling photolysis rates (J values) in atmospheres with fractional cloud cover has been developed and is implemented as Cloud-J – a multi-scattering eight-stream radiative transfer model for solar radiation based on Fast-J. Using observations of the vertical correlation of cloud layers, Cloud-J 7.3c provides a practical and accurate method for modeling atmospheric chemistry. The combination of the new maximum-correlated cloud groups with the integration over all cloud combinations by four quadrature atmospheres produces mean J values in an atmospheric column with root mean square (rms) errors of 4 % or less compared with 10–20 % errors using simpler approximations. Cloud-J is practical for chemistry–climate models, requiring only an average of 2.8 Fast-J calls per atmosphere vs. hundreds of calls with the correlated cloud groups, or 1 call with the simplest cloud approximations. Another improvement in modeling J values, the treatment of volatile organic compounds with pressure-dependent cross sections, is also incorporated into Cloud-J.},
doi = {10.5194/gmd-8-2587-2015},
journal = {Geoscientific Model Development (Online)},
number = 8,
volume = 8,
place = {United States},
year = {2015},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.5194/gmd-8-2587-2015

Citation Metrics:
Cited by: 4 works
Citation information provided by
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    Works referencing / citing this record:

    Evaluated kinetic and photochemical data for atmospheric chemistry: Volume IV – gas phase reactions of organic halogen species
    journal, January 2008

    • Atkinson, R.; Baulch, D. L.; Cox, R. A.
    • Atmospheric Chemistry and Physics, Vol. 8, Issue 15
    • DOI: 10.5194/acp-8-4141-2008

    Study of Acetone Photodissociation over the Wavelength Range 248−330 nm:  Evidence of a Mechanism Involving Both the Singlet and Triplet Excited States
    journal, June 2006

    • Blitz, Mark A.; Heard, Dwayne E.; Pilling, Michael J.
    • The Journal of Physical Chemistry A, Vol. 110, Issue 21
    • DOI: 10.1021/jp056276g

    A round Earth for climate models
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    • Proceedings of the National Academy of Sciences, Vol. 116, Issue 39
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    Solar radiation transport in the cloudy atmosphere: a 3D perspective on observations and climate impacts
    journal, January 2010


    The chemical transport model Oslo CTM3
    journal, January 2012

    • Søvde, O. A.; Prather, M. J.; Isaksen, I. S. A.
    • Geoscientific Model Development, Vol. 5, Issue 6
    • DOI: 10.5194/gmd-5-1441-2012

    Impact of Mexico City emissions on regional air quality from MOZART-4 simulations
    journal, January 2010

    • Emmons, L. K.; Apel, E. C.; Lamarque, J. -F.
    • Atmospheric Chemistry and Physics, Vol. 10, Issue 13
    • DOI: 10.5194/acp-10-6195-2010

    Multichannel analysis of correlation length of SEVIRI images around ground-based cloud observatories to determine their representativeness
    journal, January 2015

    • Slobodda, J.; Hünerbein, A.; Lindstrot, R.
    • Atmospheric Measurement Techniques, Vol. 8, Issue 2
    • DOI: 10.5194/amt-8-567-2015

    A radiative transfer module for calculating photolysis rates and solar heating in climate models: Solar-J v7.5
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    • Hsu, Juno; Prather, Michael J.; Cameron-Smith, Philip
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    Radiative impacts of cloud heterogeneity and overlap in an atmospheric General Circulation Model
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    • Oreopoulos, L.; Lee, D.; Sud, Y. C.
    • Atmospheric Chemistry and Physics, Vol. 12, Issue 19
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