A method for estimating the height of the top of the atmospheric boundary layer
An atmospheric boundary layer, altitude technology, applied in altitude/level measurement, climate sustainability, instrumentation, etc., which can solve problems such as altitude and actual result errors, limitations of applicability, thermal and dynamic structure not considered
Active Publication Date: 2022-08-09
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 with the increase of altitude, but under certain weather conditions, the atmospheric structure above the ground will exhibit an abnormal phenomenon that the temperature increases with the increase of altitude, which is called "temperature 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 height of the top of the atmospheric boundary layer. Usually, the top of the near-surface temperature inversion and the bottom of the lower troposphere are usually used as the top of the boundary layer. Taking the waters of the East China Sea as an example, from April to August every year, the southeasterly wind prevails in the East China Sea, and the frequency of near-surface temperature inversion below 1km is very high; from September to ...
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The invention provides a method for estimating the height of the top of the atmospheric boundary layer, which uses sounding data to count the seasonal distribution characteristics of the temperature inversion layer in a certain area; in the season when the near-surface temperature inversion is dominant, the number distribution of the height at which the top of the near-surface temperature inversion is located is counted. In the season when the lower troposphere temperature inversion is dominant, count the number distribution characteristics of the height at the bottom of the lower troposphere inversion, and take the lower quarter of the digit number as the number threshold for the season. The invention adjusts the numerical threshold for calculating the height of the top of the atmospheric boundary layer. The adjusted numerical threshold comprehensively considers the dynamic, thermal structure of the atmosphere and the seasonal variation characteristics of the temperature inversion layer, and the atmospheric boundary layer is estimated based on the adjusted numerical threshold. The top height is closer to the observed value.
Description
technical field [0001] The invention relates to the technical field of atmospheric boundary layer top height measurement, in particular to a Ri number threshold determination method and an atmospheric boundary layer top height estimation method based on the Ri number threshold determination method. Background technique [0002] The atmospheric boundary layer, also known as the planetary boundary layer, is the lowest layer of the atmosphere that is in direct contact with the ground. Momentum, heat and water vapor are rapidly transported and exchanged in the boundary layer. The change of the height of the boundary layer has an important impact on the distribution of aerosols, convective activities, and the formation of clouds and fog. Important indicators for judging turbulent mixing, vertical disturbance, convective transport, cloud banding and atmospheric pollutant dispersion in air quality models. [0003] At present, the international research on the height change of the ...
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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