Real time acquiring method for sea fog thickness and height of low cloud base

A technology for real-time acquisition of cloud base height, applied in height/horizontal measurement, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems affecting maritime transportation, seaport and coastal airport operations, and horizontal visibility less than 1000 meters and other issues to achieve the effect of high vertical resolution

Inactive Publication Date: 2010-12-22
OCEAN UNIV OF CHINA
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Problems solved by technology

[0002] When there is sea fog, the horizontal visibility is less than 1000 meters, which seriously affects the operations of marine transportation, seaports and coastal airports
However, there is no real-time automatic extraction of the height of low cloud cloud base by using the data of L-band secondary wind measuring radar and digital electronic radiosonde (hereinafter referred to as L-band radar data)

Method used

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  • Real time acquiring method for sea fog thickness and height of low cloud base
  • Real time acquiring method for sea fog thickness and height of low cloud base
  • Real time acquiring method for sea fog thickness and height of low cloud base

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Embodiment Construction

[0024] Such as figure 1 , The method or steps for obtaining sea fog thickness and low cloud base height of the present invention are as follows:

[0025] 1. Data preprocessing. Read in the real-time data of the digital radiosonde, decode and generate the ASCII sounding data file at that moment, which contains the height z, temperature t, relative humidity RH, dew point temperature t every 30m interval from the ground to the upper troposphere d , Air pressure P, wind direction ddd, wind speed ff. From the generated sounding data file, read in the above-mentioned data of each altitude below 1000m, and use conventional methods to decompose the wind direction ddd and wind speed ff into the meridional wind component v and the zonal wind component u.

[0026] 2. Determine whether there is a quasi-saturated layer and the thickness of the quasi-saturated layer from the ground to 1000m. According to the criterion of quasi-saturated layer: RH≥93%, or temperature dew point difference t-t d...

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Abstract

The invention relates to a real-time acquiring method for sea fog thickness and cloud base height of low clouds. The method fully utilizes data from L wave band secondary wind-detecting radar and digital dropsonde data of an observatory, orderly analyzes distribution characteristics of the temperature and moisture of sea fog and the low clouds in the vertical direction, calculates stability degree conditions and turbulent flow conditions of lower atmosphere when the sea fog and the low clouds exist, makes statistical analysis and concludes the conditions to separate the sea fog and the low clouds, calculates the sea fog thickness and the low clouds height, and acquires the sea fog thickness and the low clouds height. The formed computer software automatically displays the result. The invention provides an effective method for monitoring in real time, namely simultaneously establishing an objective and feasible method for automatically extracting the cloud base height of the low cloudsand monitoring the sea fog thickness in real time, has strong implementation, high reliability, and provides effective meteorological data for flight safety above the sea surface, maritime traffic transportation, as well as operations on harbors and costal airports.

Description

Technical field [0001] The invention belongs to marine environment monitoring technology, and specifically relates to a real-time acquisition method of sea fog thickness and low cloud base height. Background technique [0002] When there is sea fog, the horizontal visibility is less than 1,000 meters, which seriously affects maritime transportation, seaports and coastal airport operations. Studies have shown that the thicker the vertical thickness of sea fog, the denser the fog, the worse the visibility, and the less likely it is to dissipate. Therefore, the thickness of sea fog is an important part of sea fog monitoring. However, there is no effective method for real-time monitoring of sea fog thickness. [0003] In addition, low clouds often appear over the sea at mid-latitudes. Because the height of the low cloud base (the height from the sea) is generally several hundred meters, it causes great difficulties for the aircraft to take off and land. Therefore, it is necessary t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/95G01B21/08G01C5/00
CPCY02A90/10
Inventor 张苏平刘诗军刘应辰刘敬武任兆鹏杨育强王新功
Owner OCEAN UNIV OF CHINA
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