Abstract
The accurate estimate of the surface longwave fluxes contribution is important for the calculation of the surface radiation budget, which in turn controls all the components of the surface energy budget, such as evaporation and the sensible heat fluxes. This study evaluates the performance of the various downward longwave radiation parameterizations for clear and all-sky days applied to the Sertãozinho region in São Paulo, Brazil. Equations have been adjusted to the observations of longwave radiation. The adjusted equations were evaluated for every hour throughout the day and the results showed good fits for most of the day, except near dawn and sunset, followed by nighttime. The seasonal variation was studied by comparing the dry period against the rainy period in the dataset. The least square linear regressions resulted in coefficients equal to the coefficients found for the complete period, both in the dry period and in the rainy period. It is expected that the best fit equation to the observed data for this site be used to produce estimates in other regions of the State of São Paulo, where such information is not available.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Brutsaert WH (1975) On a derivable formula for long-wave radiation from clear skies. Water Resour Res 11(5):742–744
Correia FWS (2000) Estudo do balanço de radiação em área de policultivo na amazônia. Mestrado em meteorologia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos
Crawford TM, Duchon CE (1999) An inproved parameterization for estimating effective atmospheric emissivity for use in calculating daytime downwelling longwave radiation. J Appl Meteorol 38(4):474–480
Culf AD, Gash JHC (1993) Longwave radiation from clear skies in Niger: a comparison of observations with simple formulas. J Appl Meteorol 32:539–547
Duarte HF, Dias NL, Maggiotto SR (2006) Assessing daytime downward longwave radiation estimates for clear and cloudy skies in Southern Brazil. Agric For Meteorol 139(3–4):171–181
Idso SB (1981) A set of equations for full spectrum and 8- to 14 µm and 10.5- to 12.5 µm thermal radiation from cloudless skies. Water Resour Res 17:295–304
Idso SB, Jackson RD (1969) Thermal radiation from the atmosphere. J Geophys Res 74(23):5397–5403
Jacobs JD (1978) Radiation climate of Broughton Island. In: Barry RG, Jacobs JD (eds) Energy budget studies in relation to fast-ice breakup processes in Davis Strait, Institute of Arctic and Alp. Research. Occas. Paper No.26, University of Colorado. Boulder, CO, pp 105–120
Konzelmann T, Van De Wal RSW, Greuell W, Bintanja R, Henneken EAC, Abeouchi A (1994) Parameterization of global and long-wave incoming radiation for the Greenland ice sheet. Global Planet Change 9:143–164
Maykut GA, Church PE (1973) Radiation climate of Barrow, Alaska. J Appl Meteorol 12:620–628
Niemelä S, Räisänen P, Savijärvi H (2001) Comparison of surface radiative flux parameterizations. Part I: longwave radiation. Atmos Res 58(1):1–18
Silva RC (2002) Estudo do balanço de radiação no pantanal sul matogrossense. Mestrado em meteorologia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos
Sridhar V, Elliott RL (2002) Development of a simple downwelling longwave radiation scheme. Agric For Meteorol 112(3–4):237–243
Sugita M, Brutsaert WH (1993) Cloud effect in the estimation of instantaneous downward longwave radiation. Water Resour Res 29(3):599–605
Swinbank WC (1963) Long-wave radiation from clear skies. Q J R Meteorol Soc 89:339–348
Acknowledgments
The authors would like to thank the São Paulo State Research Foundation (FAPESP) for financially supporting the “Biosphere-atmosphere Interaction: Savannah and changes in land use (02/09289-9)” Project, from which the data from the micrometeorological station was acquired, and for financial support of the “Predictability study of heavy rainfall events in the Serra do Mar (04/09649-0)” Project. We also thank the Coordination of University Graduate Furtherance (CAPES) for financial support in the form of a doctorate scholarship.
Author information
Authors and Affiliations
Corresponding author
Additional information
An erratum to this article can be found at http://dx.doi.org/10.1007/s00704-010-0347-y
Rights and permissions
About this article
Cite this article
Kruk, N.S., Vendrame, Í.F., da Rocha, H.R. et al. Downward longwave radiation estimates for clear and all-sky conditions in the Sertãozinho region of São Paulo, Brazil. Theor Appl Climatol 99, 115–123 (2010). https://doi.org/10.1007/s00704-009-0128-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00704-009-0128-7