Dual-polarization meteorological radar raindrop spectrum inversion method suitable for rainfall in different climatic states

A weather radar, dual polarization technology, applied in the field of dual polarization weather radar raindrop spectrum inversion, can solve the problem of "shape-slope and other problems that cannot be called in time"

Pending Publication Date: 2021-09-03
SHANGHAI TYPHOON INST CMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its biggest disadvantage is that if there is a transition period between the two climatological rainfall types, the traditional inversion method will not be able to call the corresponding "shape-slope" relationship in time

Method used

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  • Dual-polarization meteorological radar raindrop spectrum inversion method suitable for rainfall in different climatic states
  • Dual-polarization meteorological radar raindrop spectrum inversion method suitable for rainfall in different climatic states
  • Dual-polarization meteorological radar raindrop spectrum inversion method suitable for rainfall in different climatic states

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Embodiment 1

[0041] This embodiment discloses a dual polarization meteorological radar raindrop spectrum inversion method applicable to rainfall in different climatic states. The method classifies the rainfall according to the characteristics of the climatic rainfall drop spectrum in nature, and according to the "shape- Slope" relationship, corresponding to different "horizontal reflectivity and differential reflectivity" relationships, and finally based on the real-time horizontal reflectivity and differential reflectivity of the dual-polarization radar, different formulas are called to perform real-time dual-polarization radar raindrop spectrum Inversion, and then get the actual climate rainfall.

[0042] In this embodiment, the characteristics of the climatic raindrop spectrum in nature are divided into three categories, wherein the first type is that the diameter of the raindrop is large but the concentration is low, the second type is that the diameter of the raindrop is small but the ...

Embodiment 2

[0045] The present embodiment can produce different raindrop spectrum characteristics to different climatological rainfall types (that is, the distribution of the number of raindrops of rainfall in a unit volume with the size of raindrops), and its raindrop spectrum distribution is generally expressed by the gamma model formula:

[0046] N(D)=N 0 D. μ exp(-ΛD) (4)

[0047] N(D) represents the concentration per unit volume of particles corresponding to different diameters (unit: mm –1 m –3 ), N0, μ and Λ are the intercepts of the gamma model respectively (unit: mm –1– μm –3 ), shape and slope (mm –1 )parameter. The direct observation of the characteristics of the raindrop spectrum in nature is mainly through the aircraft-mounted detector and the ground raindrop spectrometer and other equipment. In our country, the observation is mainly carried out through the ground raindrop spectrometer equipment. The biggest problem of ground raindrop spectrometer observation is that i...

Embodiment 3

[0052] In this embodiment, the characteristics of climatological rainfall droplet spectrum in nature can be divided into three categories:

[0053] 1) For the first type, the diameter of rainfall raindrops is large but the concentration is low, and the "shape-slope" relationship of formula (1) can be obtained;

[0054] 2) For the second type, the diameter of rainfall raindrops is small but the concentration is high, and the "shape-slope" relationship of formula (3) can be obtained;

[0055] 3) The third type, in view of the above two types, corresponds to the "shape-slope" relationship of formula (2).

[0056] In this embodiment, the three types are specifically manifested as follows: relative to the first raindrop type with large diameter but low concentration, for a given slope parameter Λ, it corresponds to a larger shape parameter μ; otherwise, it corresponds to the second raindrop type For the rainfall type with small diameter but high concentration, the corresponding sh...

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Abstract

The invention relates to the technical field of meteorological prediction, in particular to a dual-polarization meteorological radar raindrop spectrum inversion method suitable for rainfall in different climatic states, which classifies rainfall according to climatic state rainfall drop spectrum characteristics in the nature, according to the shape-slope relation of rainfall in different climatic states, respectively corresponds to different relations between horizontal reflectivity and differential reflectivity, and finally calls different formulas to carry out real-time dual-polarization radar raindrop spectrum inversion so as to obtain an actual climatic rainfall condition, thereby solving the problem that a traditional dual-polarization radar raindrop spectrum inversion method can only fixedly use a shape-slope relation of rainfall in one climatic state at a time, and if the method needs to be applied to rainfall in another climatic state, the shape-slope relation corresponding to the rainfall needs to be manually changed. And if a conversion period exists between the rainfall types of the two climatic states, the traditional inversion method cannot timely call respective corresponding shape-slope relations.

Description

technical field [0001] The invention relates to the technical field of meteorological forecasting, in particular to a dual-polarization meteorological radar raindrop spectrum inversion method applicable to rainfall in different climate states. Background technique [0002] Compared with traditional weather radars, dual-polarization weather radars can transmit and receive both horizontally polarized waves and vertically polarized waves, so dual-polarized radars can be used for inversion of raindrop spectrum. Zhang et al. (2001) proposed that there is a specific relationship between the shape parameter μ and the slope parameter Λ in the raindrop spectrum relation ("shape-slope (μ-Λ)" relationship), and can be monitored by dual-polarization radar-differential reflection ZDR obtains the shape parameter μ, the slope parameter Λ, and the intercept parameter N0, and finally obtains the complete distribution characteristics of the raindrop spectrum. This is the constrained gamma mo...

Claims

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Application Information

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IPC IPC(8): G01S13/95
CPCG01S13/95Y02A90/10
Inventor 鲍旭炜张帅
Owner SHANGHAI TYPHOON INST CMA
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