Abstract
The impact of 26 December 2019 annular solar eclipse (ASE) on meteorological conditions over the southeastern Arabian Peninsula is investigated. Observations sourced from the spinning enhanced visible and infrared imager (SEVIRI) and vertical temperature profiles measured by a microwave radiometer were used. The ASE, which began at 03:36:37.9 Universal Time Coordinated (UTC), that is, 31 m 29.9 s after sunrise, left a significant imprint on the land surface temperature (LST). In particular, in some regions, the LST dropped by more than 4 °C, in comparison to the previous day. In situ soil properties, in particular soil texture, were also found to have modulated the effects of the ASE, with loamy soils experiencing higher heating/cooling rates than sandy soils. Finally, the analysis of atmospheric profiles indicated that the eclipse influenced the flow throughout the atmospheric boundary layer, with a stable layer that was 45-min longer and 90-m deeper compared with the preceding day.
Highlights
T HE incoming short-wave radiation from the Sun is one of the main governing forces of all the meteorological processes occurring in the atmosphere [1]
The effects of the 26 December 2019 annular solar eclipse (ASE) on the land surface temperature (LST) and ABL over the southeastern Arabian Peninsula are analyzed using a combination of remote sensing observations
The 15-min LST derived from the spinning enhanced visible and infrared imager (SEVIRI) instrument on board MSG and the 1-min vertical temperature profiles from the microwave radiometer (MWR) are considered, together with hourly ERA-5 reanalysis data
Summary
T HE incoming short-wave radiation from the Sun is one of the main governing forces of all the meteorological processes occurring in the atmosphere [1]. As highlighted by Good [10], if a surface has a smaller thermal roughness length (e.g., bare soil when compared with a vegetated surface), the near-ground temperature gradient will be steeper, potentially leading to a reduced drop in LST This highlights the role of the surface properties on the surface and atmospheric response to an eclipse. The two main goals of the study are as follows: 1) to investigate the impact of the ASE on the surface temperature and the atmospheric boundary layer (ABL) structure in a hyperarid region and 2) to explore how the response to the ASE varies as a function of the surface properties with interest in soil parameters.
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