Net incoming radiation estimated from hourly global radiation and/or cloud observations

Nielsen, Lars Balzer; Prahm, L. P.; Berkowicz, Ruwim; Conradsen, Knut

doi:10.1002/joc.3370010305

Cited by 67 publications

(27 citation statements)

References 20 publications

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“…Others have included the albedo and obtained good results [Nielsen et al, 1981]. This study has shown that both arguments are, in effect, correct.…”

Section: Effect Of the Albedo Termmentioning

confidence: 53%

Estimation of surface net radiation in the boreal forest and northern prairie from shortwave flux measurements

Kaminsky¹,

Dubayah²

1997

J. Geophys. Res.

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“…Others have included the albedo and obtained good results [Nielsen et al, 1981]. This study has shown that both arguments are, in effect, correct.…”

Section: Effect Of the Albedo Termmentioning

confidence: 53%

Estimation of surface net radiation in the boreal forest and northern prairie from shortwave flux measurements

Kaminsky¹,

Dubayah²

1997

J. Geophys. Res.

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“…Availability of satellite derived net radiation data promises to complement the paucity of these measurements, even though such data does not have the spatial or temporal resolution that in situ net radiation sensors provide. The maintenance of net radiation measurements on a continuous long-time basis is expensive, so it is usually estimated (Nielsen et al, 1981).…”

Section: Net Radiation At Low Latitudes In West Africamentioning

confidence: 99%

“…There are several empirical relationships that can be used to estimate net radiation from routinely measured meteorological data including air temperature, insolation, cloudiness and relative humidity (e.g. Nielsen et al, 1981;Amarakoon and Chen, 1999). A major disadvantage is that these empirical relationships are not accurate enough for sensitivity tests in the modeling of surface energy exchange processes (Alados et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Measurements of net all-wave radiation at a tropical location, Ile-Ife, Nigeria

et al. 2014

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RESUMENSe presentan datos de radiación neta en todas las longitudes de onda promediados cada hora, registrados en una estación meteorológica situada en el campus de la Universidad Obafemi Awolowo, Ile-Ife (7.52º N, 4.52º E), Nigeria, durante un periodo completo de tres años (2010)(2011)(2012), para estudiar sus variaciones diurnas y estacionales. Esta información, obtenida con un radiómetro neto de alta sensibilidad de cuatro componentes, representa hasta hoy la información más consistente y detallada disponible para una localidad tropical de África Occidental. De acuerdo con los datos obtenidos, la radiación neta máxima ocurrió a las 14:00 LT (GMT + 1), y sus valores se incrementaron de manera considerable de 337.6 ± 146.4 Wm -2 en julio, que es el pico de la estación lluviosa, a 441.7 ± 82.4 Wm -2 durante marzo, en el final de la estación seca. En los meses de abril y octubre, que marcan el principio y fin de la estación lluviosa en Ile-Ife, se han registrado los valores más altos de radiación neta: 584.7 y 612.2 Wm -2 , respectivamente. Se observó una importante variación inter e intraestacional en los valores medios mensuales de radiación neta, debida principalmente a fluctuaciones de nubosidad y humedad. En el área de estudio, los datos revelaron la presencia de calentamiento radiativo neto en la superficie, cuya tendencia anual sigue una distribución bimodal. Los datos de este estudio respaldan los aportados por otros autores. ABSTRACTHourly averaged net all-wave radiation data spanning a complete three-year period (2010-2012) at a meteorological station located inside the Obafemi Awolowo University campus in Ile-Ife (7.52º N, 4.52º E), Nigeria is presented in this study to investigate its diurnal and seasonal variations. Using a high-sensitivity four-component net radiometer, the data represents so far the most consistent and detailed information available for a tropical location in West Africa. From the dataset, hourly maxima of the net radiation occurred at 14:00 LT (GMT + 1), whose values increased considerably from 337.6 ± 146.4 Wm -2 in July, which is the peak of the wet season, to 441.7 ± 82.4 Wm -2 in March, the end of the dry season. April and October, both of which mark the beginning and end of the raining season at Ile-Ife have recorded the highest values of 584.7 and 612.2 Wm -2 , respectively. There was strong intra/inter-seasonal variation observed in the monthly mean values of the net radiation due mainly to the fluctuations in cloudiness and humidity. In the study area, the data indicated a net radiative heating taking place at the surface, whose annual trend follows a bimodal distribution. The present data supports the results published in earlier studies by other authors.

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“…Global radiation, which was used to calculate photodissociation of NO 2 , was inferred from routine cloud cover data using the relationships given by Nielsen et al (1981 ).…”

Section: Street Configurationmentioning

confidence: 99%

An air pollution model for use in epidemiological studies: evaluation with measured levels of nitrogen dioxide and benzene

Raaschou-Nielsen

Hertel²,

Vignati³

et al. 2000

J Expo Sci Environ Epidemiol

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The aim of the study was to evaluate the predictions derived from the Danish Operational Street Pollution Model ( OSPM ) when the input data are obtained by simple methods that could be used in large -scale epidemiological studies. The model calculations were thus compared with passive sampler measurements of nitrogen dioxide and benzene at 103 street locations in Copenhagen, Denmark, and at 101 locations in rural areas. Data on traffic and street configuration were collected by means of a simple registration scheme in which forms were filled out by local municipal authorities. Meteorological data were derived from routine measurements at Copenhagen airport, and data on background air pollution were based on a simple empirical model. Differences in air pollution levels between rural areas and Copenhagen and differences in nitrogen dioxide concentrations at various locations in Copenhagen were well reproduced by the OSPM. The correlation coefficients ( r ) between the measured and the predicted half -year average concentrations of nitrogen dioxide in Copenhagen were between 0.75 and 0.80 for various degrees of precision of the input data for the model. The results indicate that the OSPM used with the presented methods for generation of input data might be useful in assessing long -term exposure to air pollutants in epidemiological studies. Journal of Exposure Analysis and Environmental Epidemiology (2000) 10, 4 ± 14.Keywords: air pollution, benzene, epidemiology, modelling, nitrogen dioxide, traffic. IntroductionThe adverse health effects of air pollution derived from traffic have been a great concern during the last few decades (Ayres et al., 1973;Stern et al., 1981;Gamble et al., 1987; International Agency for Research on Cancer, 1989;Raaschou -Nielsen et al., 1995;Rudell et al., 1996;Hansen et al., 1998 ). Ideally, epidemiological studies require detailed information about the exposure of each participant, but the measurements required are usually impossible, very expensive or time -consuming to perform. Alternatively, traffic pollution models can be used to estimate levels of exposure. So far, such models have been used mainly in the context of town and traffic planning and, despite their great potential, only rarely in air pollution epidemiology ( Pershagen et al., 1995;Oosterlee et al., 1996 ). This may be due to uncertainty about their validity but also because of the difficulty in obtaining the basic information required for running the models. Exploitation of such models in large -scale epidemiological studies therefore depends on the development of simple methods for collecting input data and verification of model results.Measurements of nitrogen dioxide and benzene at a wide variety of locations in Denmark were used to verify calculations derived from the Danish Operational Street Pollution Model (OSPM ) ( Hertel and Berkowicz, 1989a ). Previous studies showed good agreement between measured concentrations and those predicted by the OSPM when precise input data were used, including detailed traffic co...

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Net incoming radiation estimated from hourly global radiation and/or cloud observations

Cited by 67 publications

References 20 publications

Estimation of surface net radiation in the boreal forest and northern prairie from shortwave flux measurements

Estimation of surface net radiation in the boreal forest and northern prairie from shortwave flux measurements

Measurements of net all-wave radiation at a tropical location, Ile-Ife, Nigeria

An air pollution model for use in epidemiological studies: evaluation with measured levels of nitrogen dioxide and benzene

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