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Satellite retrieval method for night rainfall probability

A satellite and inversion technology, applied in the field of atmospheric science research, can solve problems such as increasing the difficulty of inversion at night, and achieve good application advantages and good consistency

Active Publication Date: 2012-11-21
NANJING UNIV
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Problems solved by technology

Nighttime reflectance information cannot be obtained, and precipitation can only be retrieved by relying on the information of the infrared channel itself, which undoubtedly increases the difficulty of nighttime retrieval

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  • Satellite retrieval method for night rainfall probability
  • Satellite retrieval method for night rainfall probability

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Embodiment Construction

[0030] The accompanying drawings disclose non-restrictive schematic diagrams of preferred embodiments involved in the present invention; the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] The spectral data used in this paper comes from the new generation of geostationary meteorological satellite multifunctional transport satellite (MTSAT)-2 in Japan, and the definitions of channels or brightness temperature difference (BTD) involved are shown in Table 1. The satellite images are all projected in the same longitude and latitude, and the resolution of longitude and latitude is 0.05°. There are satellite images every half hour from July to September 2010 for research, the images in August are used to form the algorithm, and the images in the other two months are used for algorithm evaluation 。

[0032] This paper uses the ground data recorded by more than 300 automatic station rain gauges in ...

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Abstract

The invention discloses a satellite retrieval method for night rainfall probability, which comprises two steps of rain area division and rainfall estimation. A rain area division method comprises the steps of establishing an RPIM (rainfall possibility identification matrix) and then obtaining rainfall probability of all kinds of combination of brightness temperature Tb1 and brightness temperature Tb4-1 in the RPIM, wherein the RPIM is established based on an IR1-BTD41 two-dimensional spectral space. Therefore, an estimated rainfall value obtained through the rain area division method and a rainfall estimation method provided by the invention can be better related to and be more slightly deviated from an actual rainfall value, i.e. the estimated rainfall value is better consistent with the actually measured value, so the satellite retrieval method for night rainfall probability has the advantage of better application to multi-spectral satellite image night rainfall retrieval and nowcasting.

Description

technical field [0001] The invention relates to a satellite inversion method of rainfall rate, in particular to a satellite inversion method for nighttime rainfall rate, which belongs to the field of atmospheric science research and is used for nighttime rainfall inversion and nowcasting of multi-spectral satellite images. Background technique [0002] The night-time precipitation retrieval algorithm for geostationary satellites generally includes the following two steps, 1) dividing the rain area, and 2) estimating the rainfall; and dividing the rain area mainly includes the following two steps: 1) screening from tropospheric clouds (ie, cumulonimbus clouds) cirrus and cirrus anvil, 2) identification of nimbostratus from warm clouds (Kurino 1997; Lensky and Rosenfeld 2003a; Luque et al. 2006). [0003] As early as 1978, Griffith et al. directly used the cloud top brightness temperature threshold of 253K to divide rain regions, but this relatively arbitrary method of rain re...

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Application Information

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IPC IPC(8): G01W1/14
CPCG01W2203/00Y02A90/10
Inventor 诸葛小勇郁凡王元张成伟
Owner NANJING UNIV
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