Spaceborne radar identification of desert regions as suppliers of dust into the atmosphere

Keywords: radar observations, highly directional radio wave backscattering, Aeolian transport of sand and dust, sand ripples, ionization, electric field

Abstract

Atmosphere dust represents a mixture of minute particles of various salts and minerals. Also it contains remains of animal and vegetable organisms, spores of causative organisms and so forth. The dust is carried by winds over considerable distances and its presence in the atmosphere is among the factors which have essential influence on the global climate of the Earth. At present the Aeolian processes and their consequences are monitored from space using multispectral optical systems (TOMS, METEOSAT, MODIS etc.) only. These are not capable of reliable identification of the areas themselves that are sources of raising the dust in the atmosphere independently of the cloudiness, solar illumination and transparency of the atmosphere. This problem can be solved with the use of space radar systems of the Earth remote sensing. The paper presents the first results of the development of a radar technique of identification of desert regions in which dust from the surface is transported up into the atmosphere under the action of Aeolian processes. The work was performed using data of Earth remote sensing SAR Envisat-1 obtained over deserts of Mauritania. Specific features of display of the narrow-beam backscattering of radio waves in radar images in dependence on the surface wind speed and direction and direction of radar illumination of the surface. It is concluded that the radar means of remote sensing represent an efficient tool for detecting regions of dust raise into the atmosphere. Results of the study can be used for the development of new methods of remote monitoring of the processes in desert areas that affect the climate of vast regions of the Earth.

Author Biographies

Viktor Ivanov, Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Earth Remote Sensing Department, Department Head

Aleksandr Matveyev, Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Earth Remote Sensing Department, Senior Researcher

Valeriy Tsymbal, Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Earth Remote Sensing Department, Senior Researcher

Sergey Yatsevich, Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Earth Remote Sensing Department, Senior Researcher

Dmytro Bychkov, Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Earth Remote Sensing Department, Researcher

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Section
Earth observation data applications: Challenges and tasks