The effect of thin high altitude clouds and aerosol layers on the solar radiation transfer to the Earth surface in twilight conditions

2019 ◽  
Keyword(s):  
Solar Radiation ◽  
High Altitude ◽  
Radiation Transfer ◽  
Earth Surface ◽  
The Earth

Modeling Solar Radiation at the Earth Surface

2012 ◽  
pp. 127-179 ◽  
Author(s):  
Marius Paulescu ◽  
Eugenia Paulescu ◽  
Paul Gravila ◽  
Viorel Badescu
Keyword(s):  
Solar Radiation ◽  
Earth Surface ◽  
The Earth

Changes in Irradiance and Illuminance on Earth Surface during 11-Year Solar Activity Cycle

2020 ◽  
pp. 61-66
Author(s):  
Alexander V. Leonidov
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Solar Radiation ◽  
Visible Region ◽  
Earth Surface ◽  
Solar Cycles ◽  
Spectral Window ◽  
Solar Altitude ◽  
The Earth ◽  
Analytic Expression

The article formulates the analytic expression approximating the sequence of Gregorian 11-year solar cycles and the expression of solar activity within one cycle. The dependences of effective thermodynamic temperature of the Sun photosphere and the solar constant, and the solar illuminance constant at the upper border of Earth atmosphere on the year number within one solar cycle were obtained. The generalised analytic expression for integral transmittance of atmosphere (within its spectral window) on the Earth surface for the direct and diffuse components of solar radiation and their sums at different solar altitude angles is presented. The analytic expressions of dependences of irradiance and illuminance on the Earth surface within spectral window of atmosphere and within the visible region of solar radiation spectrum on the year number within a certain solar cycle at different solar altitude angles are obtained. The results of calculation of direct and diffuse components of irradiance and illuminance and their sums in the case of clear sky are presented for example. The proposed approach allows similar calculations to conduct for different types of sky cover.

scholarly journals The effects of clouds and aerosols on net ecosystem CO<sub>2</sub> exchange over semi-arid Loess Plateau of Northwest China

2010 ◽  
Vol 10 (17) ◽  
pp. 8205-8218 ◽  
Author(s):  
X. Jing ◽  
J. Huang ◽  
G. Wang ◽  
K. Higuchi ◽  
J. Bi ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Northwest China ◽  
Co2 Uptake ◽  
Light Use Efficiency ◽  
Earth Surface ◽  
Clearness Index ◽  
The Earth ◽  
Use Efficiency ◽  
The Difference ◽  
Semi Arid

Abstract. The impacts of clouds and atmospheric aerosols on the terrestrial carbon cycle at semi-arid Loess Plateau in Northwest China are investigated, by using the observation data obtained at the SACOL (Semi-Arid Climate and Environment Observatory of Lanzhou University) site. Daytime (solar elevation angles of larger than 50°) net ecosystem exchange (NEE) of CO2 obtained during the midgrowing season (July–August) are analyzed with respect to variations in the diffuse radiation, cloud cover and aerosol optical depth (AOD). Results show a significant impact by clouds on the CO2 uptake by the grassland (with smaller LAI values) located in a semi-arid region, quite different from areas covered by forests and crops. The light saturation levels in the canopy are low, with a value of about 434.8 W m−2. Thus, under overcast conditions of optically thick clouds, the CO2 uptake increases with increasing clearness index (the ratio of global solar radiation received at the Earth surface to the extraterrestrial irradiance at a plane parallel to the Earth surface), and a maximum CO2 uptake and light use efficiency of vegetation occur with the clearness index of about 0.37 and lower air temperature. Under other sky conditions, CO2 uptake decreases with cloudiness but light use efficiency is enhanced, due to increased diffuse fraction of PAR. Additionally, under cloudy conditions, changes in the NEE of CO2 also result from the interactions of many environmental factors, especially the air temperature. In contrast to its response to changes in solar radiation, the carbon uptake shows a slightly negative response to increased AOD. The reason for the difference in the response of the semi-arid grassland from that of the forest and crop lands may be due to the difference in the canopy's architectural structure.

scholarly journals The spatial variation of solar radiation in Iraq

2018 ◽  
Vol 224 (2) ◽  
pp. 357-378
Author(s):  
Dr. Firas Fadel Mahdi Al Bayati
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Spatial Variation ◽  
Electromagnetic Waves ◽  
The Sun ◽  
Earth Surface ◽  
The Earth

      The solar radiation is a group of ethereal radiation emitted from the sun and it travels in the space in the form of the electromagnetic waves of about 300000KM/SEC light space. The solar radiation is regarded as the main source of energy in the atmosphere that contributes of more than (99.97) parentage of this exploited energy by the atmosphere on the earth surface.      The solar energy is responsible for all the processes that occur in the atmosphere and earth surface, clouds and rains, etc. Consequently, it controls the climate and life on the earth. Because of the earth is far away from the sun. The earth receives quite little ratio of its heat amounting to 200 million and it stops all the biological and natural aspect of the energy on the earth.

Basis for the technique of the external control of the optical equipment for the remote sensing of the Earth surface

1997 ◽  
Vol 3 (3-4) ◽  
pp. 50-53
Author(s):  
O.D. Fedorovskyi ◽  
◽  
V.I. Kononov ◽  
K.Yu. Sukhanov ◽  
◽  
...  
Keyword(s):  
Remote Sensing ◽  
External Control ◽  
Earth Surface ◽  
The Earth

ESTIMATION OF THE EARTH SURFACE TEMPERATURE BY HIMAWARI-8/AHI

2016 ◽  
Vol 72 (2) ◽  
pp. II_1-II_6 ◽  
Author(s):  
Yuuki UCHIDA ◽  
Tomohito ASAKA ◽  
Takashi NONAKA ◽  
Keishi IWASHITA ◽  
Toshiro SUGIMURA
Keyword(s):  
Surface Temperature ◽  
Earth Surface ◽  
The Earth
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