Dynamic inversion method and device for influence of forest on global snow water equivalent

Abstract

The invention discloses a forest influence global snow water equivalent dynamic inversion method, which comprises the following steps: calculating the microwave forest transmissivity of pixels according to the coniferous forest microwave forest transmissivity, the broad-leaved forest microwave forest transmissivity and the ratio of coniferous forests to broad-leaved forests; inverting the related length of the accumulated snow layer index of the ground meteorological station, and establishing a fitting model according to the related length of the accumulated snow layer index of the ground meteorological station, the snow depth of the ground station and the brightness temperature gradient data of the satellite radiometer; carrying out difference on the index correlation lengths of the stations, and expanding to any position of the global space; each accumulated snow pixel has an index correlation length value; and according to the fitting model, determining the ground snow depth of the accumulated snow pixel by using the index correlation length value of the accumulated snow pixel and the brightness temperature gradient of the satellite radiometer, and then obtaining the snow water equivalent. The invention further comprises a device for implementing the method. The problem of low precision during snow water equivalent inversion in the prior art is solved.

Description

technical field [0001] This application relates to the technical field of satellite remote sensing, in particular to a method and device for dynamic retrieval of global snow water equivalent considering the impact of forests. Background technique [0002] The cryosphere plays an important role in the global climate system and is an indicator of global climate change. Snow cover is one of the main elements of the cryosphere, with a wide distribution. At least 80% of the Eurasian and North American continents are covered by snow in winter, covering an area of ​​about 46.5 million square kilometers, and 3.8 million in August in summer. square kilometers (Frei and Robinson 1999). The albedo of snow is very high, the albedo of new snow is as high as 0.9, and the albedo of old snow is also above 0.4, so snow will reflect a large amount of solar short-wave incident radiation reaching the surface, profoundly affecting the energy balance of the earth's surface. Snow cover is a poor...

AI Technical Summary

Problems solved by technology

[0007] This application proposes a method and device for dynamic inversion of forest-influenced global snow water equivalent, which solves the technical problem of low precision in the prior art for inversion of snow water equivalent

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