INVESTIGATION AND COMPARISION OF PARAMETRIZATION METHODS OF RADIATION IN CLIMATE AND NUMERICAL WEATHER FORCASTING MODELS

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ZARE A.; IRANNEJAD P.; ALIAKBARI BIDOKHTI A.A.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2011 | Volume:21 | Issue:79 (PHYSICS ISSUE) Page(s): 29-48

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Title

INVESTIGATION AND COMPARISION OF PARAMETRIZATION METHODS OF RADIATION IN CLIMATE AND NUMERICAL WEATHER FORCASTING MODELS

Author(s)

ZARE A. | IRANNEJAD P. | ALIAKBARI BIDOKHTI A.A. | Issue Writer Certificate

Keywords

RADIATIVE TRANSMISSION EQUATIONSQ2

ATMOSPHERIC GENERAL CIRCULATION MODELSQ2

AEROSOLQ2

Abstract

Introduction: Although there are exact solution to atmospheric RADIATIVE TRANSMISSION EQUATIONS, they are not suitable for use in ATMOSPHERIC GENERAL CIRCULATION MODELS (GCM). The parameterization of atmospheric radiation for use in an atmospheric GCM is to provide a simple, accurate and fast method of calculating the total radiative flux.Aim: A review of some techniques used to compute radiation flux for use in numerical GCMs and intercomparison output of some GCMs include various methods of radiation parametrization.Materials and Methods: we review the various methods used to compute both the radiative fluxes of longwave (LW) and shortwave (SW) for use in numerical climate models.This paper discusses various methods of integration of absorption over frequency, parameterization of scattering and absorption due to atmospheric gases, separately, at both the SW and LW, surface absorption and AEROSOLs. Then, output data from some atmospheric GCMs with different radiation parametrizations are compared.Results: Line by line is one of exact radiation transmission methods for calculating of gases absorption in inhomogeneous atmosphere which considers all absorption lines. Adding- Doubling, discrete ordinate and Monte Carlo are some of exact techniques in calculation of radiation intensity of SW that have been used as a reference of parametrization. There are four integrations of all zenith angles, z-direction fluxes, du spectral interval and optical absorption path in LW equations. K-distribution, band methods and emissivity methods are among approximation methods in estimation of spectral interval. For each gas, depending on absorption band, different absorption coefficient and therefor different transfer function are available. Non-scattering atmosphere approximation, single scattering approximation, two stream solutions and Eddington approximation estimate SW radiative flux. Radiative transmission parametrization methods are investigated in some GCMs. Finally, data outputs containing absorbed Sw radiative flux in surface and atmosphere and LW radiative flux in surface are compared together and with observation data.Conclusion: radiation parameterization schemes run in GCMs may generally be different, but there are the same solutions for some parts of radiation flux calculation employed at some schemes. Global mean radiation budget calculated by GCMs especially at the earth’s surface are different. Compared to observations, the GCMs include a tendency towards more excessive surface insolation and a smaller longwave downward radiation at the surface.

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APA: Copy

ZARE, A., IRANNEJAD, P., & ALIAKBARI BIDOKHTI, A.A.. (2011). INVESTIGATION AND COMPARISION OF PARAMETRIZATION METHODS OF RADIATION IN CLIMATE AND NUMERICAL WEATHER FORCASTING MODELS. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 21(79 (PHYSICS ISSUE)), 29-48. SID. https://sid.ir/paper/70452/en

Vancouver: Copy

ZARE A., IRANNEJAD P., ALIAKBARI BIDOKHTI A.A.. INVESTIGATION AND COMPARISION OF PARAMETRIZATION METHODS OF RADIATION IN CLIMATE AND NUMERICAL WEATHER FORCASTING MODELS. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2011;21(79 (PHYSICS ISSUE)):29-48. Available from: https://sid.ir/paper/70452/en

IEEE: Copy

A. ZARE, P. IRANNEJAD, and A.A. ALIAKBARI BIDOKHTI, “INVESTIGATION AND COMPARISION OF PARAMETRIZATION METHODS OF RADIATION IN CLIMATE AND NUMERICAL WEATHER FORCASTING MODELS,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 21, no. 79 (PHYSICS ISSUE), pp. 29–48, 2011, [Online]. Available: https://sid.ir/paper/70452/en

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