研究目的
To perform a comprehensive statistical analysis of the cloud base height (CBH) measured by ground-based Vaisala ceilometer (CL31) to study different layers of the cloud in the lower troposphere up to 7.5 km height over Ahmedabad, western India during 2014 and 2015.
研究成果
The study provides a comprehensive statistical analysis of CBH over Ahmedabad, revealing seasonal variations and the dominance of low-level clouds during the monsoon season. The findings may contribute to the improvement of regional weather and climate models by providing accurate input parameters.
研究不足
The ceilometer has a detection limit up to 7.5 km, which may not capture high altitude clouds. Data during rainy conditions are eliminated, which may affect the comprehensiveness of the study. The comparison with radiosonde observations shows large uncertainties due to the drift of the radiosonde.
1：Experimental Design and Method Selection:
Utilized ground-based Vaisala ceilometer (CL31) for continuous observation of clouds over Ahmedabad, western India. The methodology includes the analysis of CBH data from December 2013 to November
2：Sample Selection and Data Sources:
20 Data from ceilometer CL31 installed at Physical Research Laboratory (PRL), Ahmedabad, and ERA-Interim reanalysis data for cloud cover and precipitation.
3：List of Experimental Equipment and Materials:
Vaisala ceilometer CL31, Automatic Weather Station (AWS) with rain gauge.
4：Experimental Procedures and Operational Workflow:
Continuous observation of CBH using ceilometer, elimination of data during rainy conditions, and comparison with radiosonde observations.
5：Data Analysis Methods:
Statistical analysis of CBH and cloud occurrence frequency, comparison with ERA-Interim reanalysis data, and validation with radiosonde observations.
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