Infrared Radiation Acquisition Of Volcanic Eruptions Based On Satellite Data

Volcanic eruptions can cause false alarm signals to satellite detection,and the satellite warning system is a harsh system that "does not allow false or false alarms." The volcanic eruption process will spray high temperature magma into the upper air,its infrared radiation will cover the whole detection band,and a large number of volcanic aerosols will be ejected in the later period of eruption,which will reflect a large amount of solar shortwave radiation,and will also affect the detection band.However,due to the complexity of volcanic eruption mechanism,there is no systematic study on the characteristics of volcanic radiation.Therefore,it is necessary to further study the spectral radiation characteristics of volcanic eruptions to obtain the energy level of volcanic eruptions.The main work carried out in this paper is as follows:This paper first collects the global volcanic information,establishes the global more than 1500 sit volcano information database and the inquiry software,through the input volcano longitude and latitude,may obtain the volcano country or the region,the altitude,the volcanic type,the volcanic historical eruption situation and so on;Secondly,considering the dynamic model of volcanic magma eruption,the three-dimensional geometric and physical model of volcano is established,and the temperature distribution of magma is obtained by inputting magmatic temperature,emissivity and eruption range.The corresponding surface radiation model of volcanic eruptions(visible light,infrared ray)is obtained.Based on the data about volcanic eruption provided by MODIS spaceborne detectors carried by TERRA and AURA satellites,the spectral radiation intensity of magma(pozzolanic column)in the detection band is calculated and the spectral radiation information in unknown band is retrieved.The temporal and spatial spectral radiation characteristics of volcanic eruptions in infrared band are obtained.Secondly,the optical thickness of volcanic aerosols observed by satellite is obtained by identifying volcanic aerosols,clouds and oceanic aerosols.According to OMIL2 B satellite product data,the temporal and spatial distribution of volcanic cloud(mainly SO2)is obtained,and the emission content of sulfur dioxide during volcanic eruption is estimated.To provide a way to prevent volcanic disasters.The atmospheric spectral radiation characteristics and atmospheric transmittance are calculated based on Modtran software,and the influence of atmosphere on the imaging of volcanic eruptions is considered,and the optical parameters of volcanic ash aerosol are calculated according to MIE theory.Considering the influence of volcanic aerosol on the imaging of volcanic eruptions,the spectral radiation intensity of volcanic eruptions under different scenarios of atmospheric radiation transfer is calculated and the spectral energy level of volcanic eruptions is obtained.This study shows that the research on spectral radiation of volcanic eruption based on MODIS satellite data is feasible and has certain reference significance for volcanic early warning.