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Fast-J: accurate simulation of in- and below-cloud photolysis in tropospheric chemical models

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Fast-J : accurate simulation of in- and below-cloud photolysis in tropospheric chemical models. / Wild, O ; Zhu, X ; Prather, M J .

In: Journal of Atmospheric Chemistry, Vol. 37, No. 3, 11.2000, p. 245-282.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Wild, O, Zhu, X & Prather, MJ 2000, 'Fast-J: accurate simulation of in- and below-cloud photolysis in tropospheric chemical models', Journal of Atmospheric Chemistry, vol. 37, no. 3, pp. 245-282. https://doi.org/10.1023/A:1006415919030

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Vancouver

Author

Wild, O ; Zhu, X ; Prather, M J . / Fast-J : accurate simulation of in- and below-cloud photolysis in tropospheric chemical models. In: Journal of Atmospheric Chemistry. 2000 ; Vol. 37, No. 3. pp. 245-282.

Bibtex

@article{3d16347165d2487ba6953b2e072ac98f,
title = "Fast-J: accurate simulation of in- and below-cloud photolysis in tropospheric chemical models",
abstract = "Photolysis rates in the troposphere are greatly affected by the presence of cloud and aerosol layers. Yet, the spatial variability of these layers along with the difficulty of multiple-scattering calculations for large particles makes their inclusion in 3-D chemical transport models computationally very expensive. This study presents a flexible and accurate photolysis scheme, Fast-J, which calculates photolysis rates in the presence of an arbitrary mix of cloud and aerosol layers. The algorithm is sufficiently fast to allow the scheme to be incorporated into 3-D global chemical transport models and have photolysis rates updated hourly. It enables tropospheric chemistry simulations to include directly the physical properties of the scattering and absorbing particles in the column, including the full, untruncated scattering phase function and the total, uncorrected optical depth. The Fast-J scheme is compared with earlier methods that have been used in 3-D models to parameterize the effects of clouds on photolysis rates. The impact of Fast-J on tropospheric ozone chemistry is demonstrated with the UCI tropospheric CTM.",
keywords = "photolysis rates, tropospheric chemistry, chemical transport modelling, GENERAL-CIRCULATION MODEL, RADIATIVE-TRANSFER, TRANSPORT MODEL, BOUNDARY-LAYER, CHEMISTRY, AEROSOL, SCATTERING, ATMOSPHERES, TRACERS, FLUX",
author = "O Wild and X Zhu and Prather, {M J}",
year = "2000",
month = nov,
doi = "10.1023/A:1006415919030",
language = "English",
volume = "37",
pages = "245--282",
journal = "Journal of Atmospheric Chemistry",
issn = "0167-7764",
publisher = "Springer Netherlands",
number = "3",

}

RIS

TY - JOUR

T1 - Fast-J

T2 - accurate simulation of in- and below-cloud photolysis in tropospheric chemical models

AU - Wild, O

AU - Zhu, X

AU - Prather, M J

PY - 2000/11

Y1 - 2000/11

N2 - Photolysis rates in the troposphere are greatly affected by the presence of cloud and aerosol layers. Yet, the spatial variability of these layers along with the difficulty of multiple-scattering calculations for large particles makes their inclusion in 3-D chemical transport models computationally very expensive. This study presents a flexible and accurate photolysis scheme, Fast-J, which calculates photolysis rates in the presence of an arbitrary mix of cloud and aerosol layers. The algorithm is sufficiently fast to allow the scheme to be incorporated into 3-D global chemical transport models and have photolysis rates updated hourly. It enables tropospheric chemistry simulations to include directly the physical properties of the scattering and absorbing particles in the column, including the full, untruncated scattering phase function and the total, uncorrected optical depth. The Fast-J scheme is compared with earlier methods that have been used in 3-D models to parameterize the effects of clouds on photolysis rates. The impact of Fast-J on tropospheric ozone chemistry is demonstrated with the UCI tropospheric CTM.

AB - Photolysis rates in the troposphere are greatly affected by the presence of cloud and aerosol layers. Yet, the spatial variability of these layers along with the difficulty of multiple-scattering calculations for large particles makes their inclusion in 3-D chemical transport models computationally very expensive. This study presents a flexible and accurate photolysis scheme, Fast-J, which calculates photolysis rates in the presence of an arbitrary mix of cloud and aerosol layers. The algorithm is sufficiently fast to allow the scheme to be incorporated into 3-D global chemical transport models and have photolysis rates updated hourly. It enables tropospheric chemistry simulations to include directly the physical properties of the scattering and absorbing particles in the column, including the full, untruncated scattering phase function and the total, uncorrected optical depth. The Fast-J scheme is compared with earlier methods that have been used in 3-D models to parameterize the effects of clouds on photolysis rates. The impact of Fast-J on tropospheric ozone chemistry is demonstrated with the UCI tropospheric CTM.

KW - photolysis rates

KW - tropospheric chemistry

KW - chemical transport modelling

KW - GENERAL-CIRCULATION MODEL

KW - RADIATIVE-TRANSFER

KW - TRANSPORT MODEL

KW - BOUNDARY-LAYER

KW - CHEMISTRY

KW - AEROSOL

KW - SCATTERING

KW - ATMOSPHERES

KW - TRACERS

KW - FLUX

U2 - 10.1023/A:1006415919030

DO - 10.1023/A:1006415919030

M3 - Journal article

VL - 37

SP - 245

EP - 282

JO - Journal of Atmospheric Chemistry

JF - Journal of Atmospheric Chemistry

SN - 0167-7764

IS - 3

ER -