研究目的
Investigating the impact of volcanic ash on the entrainment flux ratio in the atmospheric boundary layer using lidar and wavelet techniques.
研究成果
The study successfully applied wavelet techniques to analyze the impact of volcanic ash on the Buenos Aires ABL, demonstrating changes in the entrainment heat flux ratio due to the presence of ash. The findings highlight the utility of lidar and wavelet methods in studying atmospheric phenomena and their effects on boundary layer dynamics.
研究不足
The study's limitations include the impact of clouds and aerosol plumes on the accuracy of ABL height and entrainment zone thickness detection, as well as the specific conditions during the Chaitén volcano eruption that may not be representative of other volcanic events.
1：Experimental Design and Method Selection:
The study utilized a multiwavelength Raman-Rayleigh lidar to monitor the atmospheric boundary layer, focusing on the detection of volcanic ash plumes and their impact on the ABL evolution. Algorithms based on Covariance Wavelet Transform (CWT) were employed to identify the ABL height and entrainment zone thickness.
2：Sample Selection and Data Sources:
Lidar measurements from May 9th and 10th, 2008, in Buenos Aires during the Chaitén volcano eruption were analyzed.
3：List of Experimental Equipment and Materials:
The lidar system included a Nd:YAG laser model Continuum Surelite III P-IV, a Newtonian telescope, and a data acquisition system with a 20 MHz sampling rate.
4：Experimental Procedures and Operational Workflow:
The detection of ABL structures was performed using a CWT and Haar function-based algorithm, with clouds and aerosol plumes identified and removed from the profiles.
5：Data Analysis Methods:
The entrainment heat flux ratio was calculated using the upper and lower limits of the entrainment zone thickness derived from the lidar profiles.
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