Response of radiative and meteorological parameters to two solar eclipses occurred at different times of the day.
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| Title: | Response of radiative and meteorological parameters to two solar eclipses occurred at different times of the day. |
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| Authors: | Gogoi, Donali1,2 (AUTHOR), Satheeshkumar, S1 (AUTHOR), Rao, T Narayana1 (AUTHOR) tnrao@narl.gov.in, Kutty, Govindan2 (AUTHOR) |
| Source: | Journal of Earth System Science. Mar2026, Vol. 135 Issue 1, p1-16. 16p. |
| Subject Terms: | *Solar eclipses, *Boundary layer (Aerodynamics), *Humidity, *Radiation, *Gravity waves, *Wind speed |
| Abstract: | The response of radiative, meteorological, fluxes and boundary layer parameters to solar eclipses that occurred in the same season but at different times of the day has been studied using a suite of in-situ (instrumented towers) and remote sensing (SODAR and wind profiler) measurements with a special emphasis on addressing contrasting results from earlier studies. The eclipse on 15 January 2010 occurred in the noon hours, significantly impacting parameters of interest, given above, while the eclipse on 26 December 2019 occurred in the morning hours, concomitantly along with fog, diluting some of the eclipse-induced effects. Nevertheless, during both eclipses, air temperature (T) decreased by 3–4 K around the time of totality, with a varying time lag between the occurrence of totality and the observed temperature minimum. The thermal inertia of the surface layer and the dry soil could be responsible for the delay. The lag is different for different meteorological parameters (T, wind speed, humidity) during both eclipses. The reduction in turbulence intensity caused by decreased insolation reduced the sensible heat flux and also downward transport of momentum, resulting in the reduction in wind speed relative to the reference up to a height of 500 m. No significant change in wind direction is noticed, in contrast to earlier studies. Water vapor pressure decreased in 2010 at the time of the eclipse due to downdrafts and a reduction in evaporation rate, while it increased in 2019 due to fog. Although surface pressure and wind measurements within the boundary layer do not provide direct evidence of gravity waves, the observed increase in variance immediately following the eclipse in both events suggests their presence. Research highlights: Comprehensive study on response of surface and upper air parameters to two solar eclipses occurred at different times of the day. Varying time lag between the occurrence of eclipse totality and the observed temperature minimum for different elcipses. Time lag is different for different meteorological parameters. Direct evidence of gravity waves is absent in surface data, but present vaguely in wind variance at higher heights. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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