Changes in solar irradiance and atmospheric turbidity in Costa Rica during the total solar eclipse of July 11, 1991

Fernández, Walter; Castro, Vilma; Wright, Jaime; Hidalgo, Hugo; Sáenz, Alejandro

doi:10.1007/bf00575101

Cited by 23 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…5). The magnitude and time lag are in agreement to those reported during other solar eclipses using real measurements such as in Fernández et al (1993b) (between 10 and 30 min) or Founda et al (2007) (between 10 and 15 min). FLO shows the greatest variation with −4.4 K, 12 min after the lowest GHI and SH values (Figs.…”

Section: A Montornès Et Al: Solar Eclipses In Wrf-arw Model 5957supporting

confidence: 89%

“…6) linked to high nonlinear relationships between the model dynamics and physical schemes. The particular variations in wind speed and direction during and after the eclipse are related to the degree of obscuration as well as the local environment and meteorological patterns, as it has been presented in other previous studies (Fernández et al, 1993b;Founda et al, 2007;Wu et al, 2011).…”

Section: A Montornès Et Al: Solar Eclipses In Wrf-arw Model 5957supporting

confidence: 64%

“…The first study concerned the impact on the global horizontal irradiance (GHI) measurements, while the second one analyzed the effect on temperature, humidity and wind speed on the ground and in the free atmosphere. Fernández et al (1993b) observed negative temperature deviations ranging from 2 to 5 • C reaching the minimum value between 10 and 30 min after the maximum obscuration of the solar disk. Surface wind speed experienced a noteworthy reduction some minutes after reaching the lowest temperature in those sites not dominated by the large-scale patterns.…”

Section: A Montornès Et Al: Solar Eclipses In Wrf-arw Modelmentioning

confidence: 88%

See 2 more Smart Citations

Implementation of Bessel's method for solar eclipses prediction in the WRF-ARW model

Montornès

Codina

Zack³

et al. 2016

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Solar eclipses are predictable astronomical events that abruptly reduce the incoming solar radiation into the Earth's atmosphere, which frequently results in nonnegligible changes in meteorological fields. The meteorological impacts of these events have been analyzed in many studies since the late 1960s. The recent growth in the solar energy industry has greatly increased the interest in providing more detail in the modeling of solar radiation variations in numerical weather prediction (NWP) models for the use in solar resource assessment and forecasting applications. The significant impact of the recent partial and total solar eclipses that occurred in the USA (23 October 2014) and Europe (20 March 2015) on solar power generation have provided additional motivation and interest for including these astronomical events in the current solar parameterizations.Although some studies added solar eclipse episodes within NWP codes in the 1990s and 2000s, they used eclipse parameterizations designed for a particular case study. In contrast to these earlier implementations, this paper documents a new package for the Weather Research and ForecastingAdvanced Research WRF (WRF-ARW) model that can simulate any partial, total or hybrid solar eclipse for the period 1950 to 2050 and is also extensible to a longer period. The algorithm analytically computes the trajectory of the Moon's shadow and the degree of obscuration of the solar disk at each grid point of the domain based on Bessel's method and the Five Millennium Catalog of Solar Eclipses provided by NASA, with a negligible computational time. Then, the incoming radiation is modified accordingly at each grid point of the domain.This contribution is divided in three parts. First, the implementation of Bessel's method is validated for solar eclipses in the period 1950-2050, by comparing the shadow trajectory with values provided by NASA. Latitude and longitude are determined with a bias lower than 5 × 10 −3 degrees (i.e., ∼ 550 m at the Equator) and are slightly overestimated and underestimated, respectively. The second part includes a validation of the simulated global horizontal irradiance (GHI) for four total solar eclipses with measurements from the Baseline Surface Radiation Network (BSRN). The results show an improvement in mean absolute error (MAE) from 77 to 90 % under cloudless skies. Lower agreement between modeled and measured GHI is observed under cloudy conditions because the effect of clouds is not included in the simulations for a better analysis of the eclipse outcomes. Finally, an introductory discussion of eclipse-induced perturbations in the surface meteorological fields (e.g., temperature, wind speed) is provided by comparing the WRF-eclipse outcomes with control simulations.

show abstract

Section: A Montornès Et Al: Solar Eclipses In Wrf-arw Model 5957supporting

confidence: 89%

Section: A Montornès Et Al: Solar Eclipses In Wrf-arw Model 5957supporting

confidence: 64%

Section: A Montornès Et Al: Solar Eclipses In Wrf-arw Modelmentioning

confidence: 88%

See 1 more Smart Citation

Implementation of Bessel's method for solar eclipses prediction in the WRF-ARW model

Montornès

Codina

Zack³

et al. 2016

Atmos. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…There are only a few studies (Fernandez et al, 1993;Mikhalev et al, 1999) that present the eclipse-induced changes in the spectral solar UV irradiance at the earth's surface, and even fewer measurements of the extraterrestrial (ET) spectrum at UV wavelengths, exist (Show et al, 1978;Greve and Neckel, 1996;Köpke et al, 2001;Emde and Mayer, 2007). Several earlier studies have examined possible effects of a solar eclipse on the ozone column (Bojkov, 1968;Chakrabarty et al, 1997;Jerlov et al, 1954;Svensson, 1958;Zerefos et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Effects of total solar eclipse of 29 March 2006 on surface radiation

et al. 2007

View full text Add to dashboard Cite

Abstract. Solar irradiance spectral measurements were performed during a total solar eclipse. The spectral effect of the limb darkening to the global, direct irradiance and actinic flux measurements was investigated. This effect leads to wavelength dependent changes in the measured solar spectra showing a much more pronounced decrease in the radiation at the lower wavelengths. Radiative transfer model results were used for the computation of a correction for the total ozone measurements due to the limb darkening. This correction was found too small to explain the large decrease in total ozone column derived from the standard Brewer measurements, which is an artifact in the measured irradiance due to the increasing contribution of diffuse radiation against the decreasing direct irradiance caused by the eclipse. Calculations of the Extraterrestrial spectrum and the effective sun's temperatures, as measured from ground based direct irradiance measurements, showed an artificial change in the calculations of both quantities due to the fact that radiation coming from the visible part of the sun during the eclipse phases differs from the black body radiation described by the Planck's law.

show abstract

“…There are few studies [Fernandez et al, 1993;Mikhalev et al, 1999] that present the solar-eclipse-induced changes in the spectral solar UV irradiance at the Earth's surface, and even fewer measurements exist of solar limb darkening observations of the extraterrestrial spectrum at UV wavelengths [e.g., Greve and Neckel, 1996]. It should be mentioned here that the limb darkening effect in the UV-B solar spectrum is expected to be wavelength dependent [Svensson, 1958].…”

Section: Introductionmentioning

confidence: 99%

Changes in surface solar UV irradiances and total ozone during the solar eclipse of August 11, 1999

Zerefos¹,

Balis²,

Meleti³

et al. 2000

J. Geophys. Res.

View full text Add to dashboard Cite

Changes in solar irradiance and atmospheric turbidity in Costa Rica during the total solar eclipse of July 11, 1991

Cited by 23 publications

References 13 publications

Implementation of Bessel's method for solar eclipses prediction in the WRF-ARW model

Implementation of Bessel's method for solar eclipses prediction in the WRF-ARW model

Effects of total solar eclipse of 29 March 2006 on surface radiation

Changes in surface solar UV irradiances and total ozone during the solar eclipse of August 11, 1999

Contact Info

Product

Resources

About