• Alados-Arboledas, L., J. Vida, and J. I. Jiménez, 1988: Effects of solar radiation on the performance of pyrgeometers with silicon domes. J. Atmos. Oceanic Technol.,5, 666–670.

    • Crossref
    • Export Citation
  • Albrecht, B., and S. K. Cox, 1977: Procedures for improving pyrgeometer performance. J. Appl. Meteor.,16, 188–197.

    • Crossref
    • Export Citation
  • ——, M. Poellot, and S. K. Cox, 1974: Pyrgeometers measurements from aircraft. Rev. Sci. Instrum.,45, 33–38.

    • Crossref
    • Export Citation
  • Batlles, F. J., F. J. Olmo, and L. Alados-Arboledas, 1995: On shadow band correction methods for diffuse irradiance measurements. Sol. Energy,54, 105–114.

    • Crossref
    • Export Citation
  • Berdahl, P., and R. Fromberg, 1982: The thermal radiance of clear skies. Sol. Energy,29, 229–314.

    • Crossref
    • Export Citation
  • Culf, A. D., and J. Gash, 1993: Longwave radiation from clear skies in Niger: A comparison of observations with simple formulas. J. Appl. Meteor.,32, 539–547.

    • Crossref
    • Export Citation
  • Dehne, K., U. Bergholter, and F. Kasten, 1993: IEA comparison of longwave radiometers. International Energy Agency Rep. IEA-SHCP-9F-3, 72 pp. [Available from K. Dehne, Deutscher Welterdienst Meteorologisches ObservaForium, Hamburg, Post. Ach 650150, D-22361, Hamburg, Germany.].

  • Duchon, C. E., and G. E. Wilk, 1994: Field comparisons of direct and component measurements of net radiation under clear skies. J. Appl. Meteor.,33, 245–251.

    • Crossref
    • Export Citation
  • Enz, J. W., J. C. Klink, and D. G. Baker, 1975: Solar radiation effects on pyrgeometer performance. J. Appl. Meteor.,14, 1297–1302.

    • Crossref
    • Export Citation
  • Foot, J. S., 1986: A new pyrgeometer. J. Atmos. Oceanic Technol.,3, 363–370.

    • Crossref
    • Export Citation
  • Halldin, S., and A. Lindroth, 1992: Errors in net radiometry: Comparison and evaluation of six radiometer designs. J. Atmos. Oceanic Technol.,9, 762–783.

    • Crossref
    • Export Citation
  • Heitor, A., A. J. Biga, and R. Rosa, 1991: Thermal radiation components of the energy balance at the ground. Agric. For. Meteor.,54, 29–48.

    • Crossref
    • Export Citation
  • Ineichen, P., M. Gremaud, O. Guisan, and A. Mermoud, 1984: Infrared sky radiation in Geneva. Sol. Energy,32, 537–545.

    • Crossref
    • Export Citation
  • Lorenz, D., P. Wendling, P. Burkert, F. Fergg, and G. Wildgruber, 1996: The chopped pyrgeometer: A new step in pyrgeometry. J. Atmos. Oceanic Technol.,13, 114–125.

    • Crossref
    • Export Citation
  • Miskolczi, F., and R. Guzzi, 1993: Effect of non-uniform spectral dome transmittance on the accuracy of infrared radiation measurements using shielded pyrradiometers and pyrgeometers. Appl. Opt.,32, 3257–3265.

    • Crossref
    • Export Citation
  • Oliveri, J., 1991: Measurement of longwave downward irradiance using a PIR pyrgeometer. Radiation and climate. WMO/TD No. 453, App. B, 21 pp.

  • Philipona, R., C. Frölich, and Ch. Betz, 1995: Characterization of pyrgeometers and the accuracy of atmospheric long-wave radiation measurements. Appl. Opt.,34, 1598–1605.

    • Crossref
    • Export Citation
  • Shiobara, M., and S. Asano, 1992: The dome effect on the performance of pyrgeometer with silicon domes. Pap. Meteor. Geophys.,43, 17–31.

    • Crossref
    • Export Citation
  • Wardle, D. I., and L. J. B. McArthur, 1987: Ground-level monitoring of longwave irradiance with the Eppley Pyrgeometer. The Status of Radiatively Active Gases (RAGS): Measuring the Greenhouse Effect, W. F. J. Evans, A. J. Forester, and D. I. Wardle, Eds., Atmospheric Environment Service, 173–178.

  • Yamanuchi, T., M. Wada, S. Mae, S. Kawaguchi, and K. Tsukamura, 1981: Measurements of radiation components at Mizuho Station, East Antarctica in 1979. Mem. Natl. Inst. Polar Res., Spec. Issue (Jpn.),19, 27–39.

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 120 116 4
PDF Downloads 27 25 2

Effects of Natural Ventilation and Solar Radiation on the Performance of Pyrgeometers

View More View Less
  • 1 Grupo de Física de la Atmósfera, Departmento de Física Aplicada, Universidad de Almería, Almeria, Spain
  • | 2 Grupo de Física de la Atmósfera, Departmento de Física Aplicada, Universidad de Granada, Granada, Spain
© Get Permissions Rent on DeepDyve
Restricted access

Abstract

In this work the authors present the results of field experiments carried out in Almería (36.83°N, 2.42°W), a seashore location in southeastern Spain, in order to evaluate the performance of Eppley precision infrared radiometer (PIR) pyrgeometers. The authors estimate the systematic errors in the measurements of downward longwave radiation caused by solar heating of the pyrgeometer’s dome. Pyrgeometer measurements have been obtained in a series of experiments in which the dome of the pyrgeometer has been, alternately, exposed to the solar beam and shaded by a disk. These measurements have been completed with solar direct irradiance and wind velocity measurements. This study confirms previous assessments about the magnitude of this effect and its possible estimation in terms of global horizontal solar irradiance. Additionally, the authors have quantified the influence of natural ventilation on the solar heating effect. The experiments have confirmed the reduction of the solar heating effect with an increase of natural ventilation rates on the pyrgeometer. Nevertheless, this reduction reaches a limit, indicating that the effect cannot be fully eliminated, as has been already pointed out for mechanically driven ventilated pyrgeometers. A formula for the correction of the solar heating effect considering the wind velocity influence is proposed. It estimates the necessary correction as a function of solar irradiance and wind velocity, thus allowing the suppression of systematic errors, which could represent up to +47 W m−2 for the worst situation (no wind, high irradiation), and providing experimental measurements that are affected by a random error of about ±5 W m−2.

Corresponding author address: L. Alados-Arboledas, Dpto. de Física Aplicada, Universidad de Granada, Fuentenueva s/n, 18071-Granada, Spain.

Email: alados@ugr.es

Abstract

In this work the authors present the results of field experiments carried out in Almería (36.83°N, 2.42°W), a seashore location in southeastern Spain, in order to evaluate the performance of Eppley precision infrared radiometer (PIR) pyrgeometers. The authors estimate the systematic errors in the measurements of downward longwave radiation caused by solar heating of the pyrgeometer’s dome. Pyrgeometer measurements have been obtained in a series of experiments in which the dome of the pyrgeometer has been, alternately, exposed to the solar beam and shaded by a disk. These measurements have been completed with solar direct irradiance and wind velocity measurements. This study confirms previous assessments about the magnitude of this effect and its possible estimation in terms of global horizontal solar irradiance. Additionally, the authors have quantified the influence of natural ventilation on the solar heating effect. The experiments have confirmed the reduction of the solar heating effect with an increase of natural ventilation rates on the pyrgeometer. Nevertheless, this reduction reaches a limit, indicating that the effect cannot be fully eliminated, as has been already pointed out for mechanically driven ventilated pyrgeometers. A formula for the correction of the solar heating effect considering the wind velocity influence is proposed. It estimates the necessary correction as a function of solar irradiance and wind velocity, thus allowing the suppression of systematic errors, which could represent up to +47 W m−2 for the worst situation (no wind, high irradiation), and providing experimental measurements that are affected by a random error of about ±5 W m−2.

Corresponding author address: L. Alados-Arboledas, Dpto. de Física Aplicada, Universidad de Granada, Fuentenueva s/n, 18071-Granada, Spain.

Email: alados@ugr.es

Save