Emission long wave radiation value attenuation correction method suitable for FY3BVIRR satellite

Abstract

The invention discloses an emitted long wave radiation value attenuation correction method suitable for an FY3BVIRR satellite, and the method comprises the following steps: S1, calculating the change of local time of a descending node of a satellite orbit along with the year, month and day, and building a fitting relation between the observation local time and the year, month and day; s2, FY3B satellite inversion OLR data are recorded, according to the correction method suitable for FY3BVIRR satellite emission long wave radiation value attenuation, CERES OLR is used for verifying the FY3B OLR, it is found that the daily product average deviation ranges from 0 W / m < 2 > to 3.5 W / m < 2 > in 2009 and ranges from 0 W / m < 2 > to 2 W / m < 2 > in 2019, and the fitting line where the average deviation changes along with time is y =-0.0005 x + 20.616; and after the deviation coefficient is calculated and corrected by using the method, the daily average deviation of the product is between 0.5 W / m < 2 > and 3.5 W / m < 2 > in 2019, and the fitting line of the average deviation along with the change of time is that y is equal to 0.0001 x + 5.0533. Before correction, the average deviation of the FY3B OLR shows a remarkable deviation falling trend along with time change; after correction, the FY3B OLR average deviation tends to be gentle along with the time change, so that the data stability in the later period and the early period of the satellite working period is improved.

Description

technical field [0001] The invention relates to the technical field of meteorology, in particular to a method for correcting the attenuation of emitted long-wave radiation values ​​of FY3BVIRR satellites. Background technique [0002] Fengyun-3B (FY3B) is the second satellite of my country's Fengyun-3 series and the first operational satellite. It was successfully launched on December 5, 2008 and has been in orbit for more than 12 years. As the service life of the satellite increases, the orbit of the satellite drifts. For polar orbit satellites, the originally designed observation time changes. The FY3B satellite design observation time is 1:30 pm local time, and the current satellite observation time has been calculated. After 4 pm, this phenomenon is called satellite orbit drift. [0003] Outgoing Longwave Radiation (OLR) at the top of the atmosphere is the thermal radiation flux density radiated from the earth's atmosphere system to outer space, and is one of the import...

AI Technical Summary

Problems solved by technology

For this reason, the present invention provides a method for correcting the attenuation of the emitted long-wave radiation value of the FY3BVIRR satellite, to solve the need to take into account the real-time data guarantee of the meteorological business department in the research and development process of the FY3 OLR climate data set to improve data availability. Annual lifetime life correction due to orbital drift

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