Atmospheric boundary layer top height estimation method
An atmospheric boundary layer and altitude technology, applied in altitude/horizontal measurement, climate sustainability, instruments, etc., can solve problems such as not considering thermal and dynamic structures, errors between altitude and actual results, and applicability limitations
Active Publication Date: 2020-12-29
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
In this method, the Ri number threshold is set as a constant of 0.25, which does not consider the characteristics of thermal and dynamic structures in the boundary layer in different regions and seasons, resulting in a large error between the boundary layer height and the actual result, which may be several hundred or even lower than the actual height. Thousands of meters, limited applicability
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[0015] Under normal circumstances, the atmospheric temperature decreases as the height increases, but under certain weather conditions, the atmospheric structure above the ground will experience an abnormal phenomenon in which the temperature increases with the increase of height, which is called "inversion" in meteorology. The atmosphere where the temperature inversion occurs is called the "inversion layer". The study found that the seasonal distribution characteristics of the inversion layer have a good correspondence with the top height of the atmospheric boundary layer. Usually, the top of the inversion near the surface and the bottom of the inversion in the lower troposphere usually serve as the top of the boundary layer. Taking the East China Sea as an example, from April to August every year, the southeast wind prevails in the East China Sea, and the frequency of temperature inversion near the ground below 1km is very high; from September to March of the next year, the n...
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The invention provides an atmospheric boundary layer top height estimation method. The method comprises the steps of performing statistics on season distribution characteristics of a temperature inversion layer of a certain region by utilizing sounding data; in a season in which near-surface temperature inversion is dominant, performing statistics on number distribution characteristics of a heightwhere a near-surface temperature inversion top is located, and taking a quarter of a number of the number distribution characteristics as a number threshold of the season; and in a season in which troposphere low-layer temperature inversion is dominant, performing statistics on number distribution characteristics of a height where a troposphere low-layer temperature inversion bottom is located, and taking a quarter of a number of the number distribution characteristics as a number threshold of the season. According to the method, the number thresholds for calculating the atmospheric boundarylayer top height are adjusted; the adjusted number thresholds comprehensively consider seasonal change characteristics of atmospheric power, a thermodynamic structure and the temperature inversion layer; and the atmospheric boundary layer top height estimated based on the adjusted number thresholds is closer to an observation value.
Description
technical field [0001] The invention relates to the technical field of calculating the height of the top of the atmospheric boundary layer, in particular to a method for determining the threshold of the Ri number and a method for estimating the height of the top of the atmospheric boundary layer based on the method for determining the threshold of the Ri number. Background technique [0002] The atmospheric boundary layer, also known as the planetary boundary layer, is the lowest layer of the atmosphere directly in contact with the ground. Momentum, heat, and water vapor are transported and exchanged rapidly in the boundary layer, and changes in the height of the boundary layer have an important impact on the distribution of aerosols, convective activities, and the formation of clouds and fog. Important indicators in air quality models for judging turbulent mixing, vertical disturbance, convective transport, cloud banding, and dispersion of atmospheric pollutants. [0003] ...
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IPC IPC(8): G01C5/06
CPCG01C5/06Y02A90/10
Inventor 李昀英张志伟
Owner NAT UNIV OF DEFENSE TECH