Method for improving areal aridity/humidity simulating effect

Abstract

The invention discloses a method for improving an areal aridity / humidity simulating effect. The method comprises the following steps: collecting monthly meteorological data of each site in a study area and net long wave radiation data in the study area, calculating total radiation simulation values by at least two total radiation correcting methods respectively, comparing all the total radiation simulation values with a total radiation observation value respectively, and judging out the total radiation correcting method with the highest accuracy; calculating net long wave radiation values by different net long wave radiation calculating methods, then judging out the net long wave radiation calculating method with the highest accuracy, and calculating a radiation correcting formula of net radiation; calculating the largest possible evapotranspiration according to the radiation correcting formula, and calculating an aridity / humidity index according to the largest possible evapotranspiration. Compared with the conventional FAO56 model calculation method, the method provided by the invention has the advantages as follows: through modification of the conventional model estimation method, the aridity / humidity simulating effect is improved, the applicable area of the model estimation method is widened and the model estimation method is higher in accuracy and better in reliability.

Description

technical field [0001] The invention relates to the technical field of climate element calculation, and more specifically, the invention is a method for improving the effect of regional dry humidity simulation. Background technique [0002] As one of the components of climate, the wet and dry conditions play an important role in the spatial distribution of the natural environment. The dryness and wetness of the region are characterized by aridity or humidity index. The former is the ratio of the maximum possible evapotranspiration to precipitation, and the latter is the opposite. They are collectively referred to as the Aridity / Humidity index. Among them, the maximum possible evapotranspiration (ET o ) is also called potential evapotranspiration or reference crop evapotranspiration, which is the sum of surface evaporation and vegetation transpiration under the condition of sufficient water. [0003] Traditional ET o There are three main methods of calculation: lysimeter m...

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Problems solved by technology

[0006] In order to solve the problems that the traditional model estimation method has poor dry humidity simulation effect and limited application area, the present invention discloses a method for improving the regional dry humidity simulation effect. Through the correction of the traditional model, the accuracy of the model estimation method is improved. In particular, based on the FAO56 model, the present invention corrects the radiation item of the model according to my country's measured radiation data, fills in the gaps in the model's net long-wave radiation correction in the past research, and obtains a calculation reference crop evapotranspiration suitable for my country The empirical coefficient of the radiation item, so that the model results can better represent the maximum possible evapotranspiration in my country's specific natural environment, thereby improving the simulation effect of China's dry humidity

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