Assimilation method for inversion of sea fog humidity by meteorological satellite

A meteorological satellite and sea fog technology, which is applied in meteorology, weather condition prediction, measurement devices, etc., can solve problems such as the lack of obvious improvement in water vapor conditions and the failure of sea fog forecasting.

Active Publication Date: 2020-01-21
OCEAN UNIV OF CHINA
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Problems solved by technology

However, the water vapor conditions in the initial field have not been significantly improved, which is often an important reason for the failure of sea fog forecasts

Method used

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  • Assimilation method for inversion of sea fog humidity by meteorological satellite
  • Assimilation method for inversion of sea fog humidity by meteorological satellite
  • Assimilation method for inversion of sea fog humidity by meteorological satellite

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with specific embodiments.

[0020] figure 1 The operation flow of the all-weather sea fog monitoring module is given. Based on MTSAT satellite data, this module retrieves the three-dimensional structure of sea fog at night and day: at night, calculate the brightness temperature difference between MTSAT short-wave channel IR4 (wavelength 3.5-4.0 μm) and long-wave channel IR1 (wavelength 10.3-11.3 μm) SLTD, the area that satisfies -5.5K≤SLTD≤-2.5K is the fog area, use SLTD to calculate the fog top height H n (H n =-212+191|SLTD×0.5|); in the daytime, calculate the difference between the IR4 brightness temperature of MTSAT and SST (ISTD), the area with ISTDd (H d =45δ 2 / 3 ).

[0021] The main idea of ​​the sea fog humidity building module is: since the air in the sea fog is close to saturation, this module assumes that the relative humidity in the inversion fog area is 100%, and the relative humid...

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Abstract

The invention discloses an assimilation method for inversion of the sea fog humidity by a meteorological satellite. The assimilation method comprises an all-weather sea fog monitoring module, a sea fog humidity construction module, a sea fog temperature construction module and a temperature and humidity data assimilation module. The all-weather sea fog monitoring module is used for carrying out all-weather monitoring on yellow sea fog based on MTSAT satellite data to obtain a three-dimensional distribution state of the sea fog; the sea fog humidity construction module and the sea fog temperature construction module are used for constructing humidity and temperature observation in a fog area based on sea fog information; and the temperature and humidity data assimilation module is used forassimilating by utilizing cycling-3DVAR. The method has the beneficial effects that the forecast initial field can be improved according to the inversion fog area and the change characteristics of thetemperature and humidity structure in the sea fog development process, so that the sea fog short-time proximity forecast result is further improved.

Description

technical field [0001] The invention belongs to the technical field of short-term near numerical forecasting and data assimilation, and relates to an assimilation method for retrieving sea fog humidity by meteorological satellite MTSAT (Multifunctional Transport Satellites). Background technique [0002] Sea fog is a weather phenomenon that occurs in the atmospheric boundary layer of the sea and is affected by the ocean. The Yellow Sea is one of the high-incidence areas of sea fog in my country's coastal waters. In recent years, with the rapid improvement of computing power, numerical simulation has become a useful tool for studying and forecasting sea fog. There is an urgent need for sea fog numerical forecasting, especially short-term nowcasting. Previous studies have shown that the results of numerical simulations are very sensitive to errors in the model's initial field. In order to improve the quality of the initial field, scholars from various countries have done a ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G01W1/10
CPCG06Q10/04G01W1/10Y02A90/10
Inventor 高山红高小雨王永明
Owner OCEAN UNIV OF CHINA
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