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Method for evaluating temperature extreme value change

An extreme-value, large-scale technique for climate research

Pending Publication Date: 2021-12-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are intricate interactive effects among various elements that affect extreme temperature (such as geopotential height, wind field, teleconnection factors, etc.), but these effects are difficult to represent in the form of traditional functions
At present, most of the research in this area only focuses on one or more individual elements, and rarely considers the influence of the interaction between different elements on the temperature extremes

Method used

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  • Method for evaluating temperature extreme value change

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Embodiment

[0020] Example: such as figure 1 As shown, the present invention provides a method for evaluating changes in temperature extremes. Firstly, through HadEX3's high-precision grid point land surface climate extreme event index data set, the temperature-related extreme value index data is obtained; through the ERA5 reanalysis data, the circulation fields such as 500hPa wind field, 500hPa geopotential height, and sea level pressure are obtained Data; Large-scale circulation model index data such as ENSO, PDO, PNA, AO, and NAO are obtained through the National Weather Service of the United States. Secondly, the data is decomposed by EOF, based on different time scales and different seasons, and then the trend change analysis of temperature extremes is carried out according to the least 20% regression and Mann-Kendall test; according to the period when the temperature extremes occur, the corresponding circulation field is extracted and large-scale circulation model data, through Pe...

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Abstract

The invention provides a method for evaluating temperature extreme value change, which comprises the following steps of: firstly, acquiring temperature extreme value index data, circulation field data and large-scale circulation mode index data; then, EOF decomposition is carried out on the data based on different time scales and different seasons, and then trend change analysis of the temperature extreme value is carried out according to least square regression and Mann-Kendall inspection; secondly, recognizing a single circulation field influencing a temperature extreme value and a factor of a large-scale circulation mode index through Pearson correlation analysis; and finally, recognizing factors having significant contribution to the temperature extreme value based on a factor analysis method, and quantifying the influence of the interaction effect among the key factors on the temperature extreme value.

Description

technical field [0001] The invention belongs to the field of climate research, and in particular relates to a method for evaluating temperature extreme value changes. Background technique [0002] Over the past few decades, temperature and extreme temperature anomalies have had extremely serious negative impacts on societies, economies, and people's livelihoods. At home and abroad, research on climate extremes and their impact mechanisms has been paid unprecedented attention. Understanding the change mechanism of extreme climates is very important for predicting the occurrence of extreme climate events and taking measures to reduce their related impacts. There are intricate interactive effects among various elements that affect extreme temperature (such as geopotential height, wind field, teleconnection factors, etc.), but these effects are difficult to characterize in the form of traditional functions. At present, most studies in this area only focus on one or more individ...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q10/04G01W1/10
CPCG06Q10/06393G06Q10/04G01W1/10
Inventor 翟媛媛黄国和周雄吴莹辉鲁晨宋唐女
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)