基于小波协方差变换法,由折射指数廓线确定大气边界层顶高度,利用2007至2012年气象、电离层与气候星座观测系统(Constellation Observing System for Meteorology Ionosphere and Climate,COSMIC)掩星折射指数廓线分析全球大气边界层顶参数随地理位置、季节和日变化的特征,结果表明全球大气边界层顶结构受热力因素和大气动力因素的影响,具有明显随经纬度变化的特征.在大气动力因素主要影响下,30°S～30°N范围内陆域比海域的季节变化幅度更强.对全球大气边界层顶高度月均值和去季节性变化距平值的分析表明2008年和2011年大气边界层顶高度出现季节性异常.大气边界层顶气压与高度在全球呈负相关,而温度与高度在南北纬40°～90°呈正相关,30°S～30°N呈负相关.2012年全球大气边界层顶高度日变化幅度均值为0.37 km,同纬度海洋与陆地区域年平均边界层顶高度的日变化有一定相关性.
Analysis on the Variation of Global ABL Top Structure Using COSMIC Radio Occultation Refractivity
The wavelet covariance transform method was used to dervive the height of the ABLT from refractivity profiles.COSMIC refractivity data from 2007 to 2012 was used in an analysis of the spatial,seasonal,and diurnal variations in global ABLT parameters.The results show that the latitudinal and longitudinal variations of the ABLT parameters are distinct.Under the impact of atmospheric dynamic factors,the amplitude of the seasonal variation over land area is greater than that over ocean area in the 30°S to 30°N range.ABLT temperature and ABLT height are positively correlated over 40°S-90°S and 40°N-90°N ranges,and is negatively correlated over the 30°S～30°N range.The ABLT height in 2008 and 2011 were found to diverge from the monthly means for six years.The mean diurnal variation amplitude of global mean ABL depth in 2012 is 0.37 km.The diurnal variation of ABL depth over land and sea areas of the same latitude is correlated to each other to some extent.
NETL
NSTL
万方数据
维普
