DOI: 10.1002/jgrd.50588
论文题名: Horizontal structure function and vertical correlation analysis of mesoscale water vapor variability observed by airborne lidar
作者: Fischer L. ; Craig G.C. ; Kiemle C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7579
结束页码: 7590
语种: 英语
英文关键词: airborne lidar observations
; scaling exponent statistics
; tropospheric water vapor variability
Scopus关键词: Instrument errors
; Meteorology
; Optical radar
; Scaling laws
; Airborne LiDAR
; Airborne lidar measurements
; Jump discontinuities
; Long range correlations
; Scaling exponent
; tropospheric water vapor variability
; Two-dimensional cross sections
; Vertical correlation
; Water vapor
; air mass
; airborne sensing
; convective cloud
; correlation
; latitude
; lidar
; resolution
; seasonal variation
; statistical analysis
; two-dimensional modeling
; water vapor
英文摘要: Analysis is presented of airborne lidar measurements of water vapor, covering a height range from 1.5 to 10.4 km, from three field campaigns (midlatitude summer, polar winter, and subtropical summer). The lidar instrument provides two-dimensional cross sections of absolute humidity, with high accuracy (errors less than 5-7%) and high vertical (∼ 200 m) and horizontal (∼ 2 km) resolution. Structure functions, i.e., statistical moments up to the fifth-order of absolute increments over a range of scales, are investigated, and power law scaling or statistical-scale invariance was found over horizontal distances from 5 to 100 km. The scaling exponents are found to take different values, depending on whether or not the observations were taken in an air mass where convective clouds were present. The exponent of the first-order structure function in nonconvective regions, H=0.63±0.10, is large indicating a smooth series with long-range correlations, in contrast to the lower value H=0.35±0.11 found in convective air masses. Correspondingly, the moisture field in the convective regime was found to be more intermittent than for the nonconvective regime, i.e., water vapor structures in convectively influenced air mass show more jump discontinuities, which could be explained by the moistening and drying effects of updrafts and downdrafts in convective air mass. Within each regime (convective or nonconvective), the values appear to be universal, with no significant dependence on the season, latitude, or height where the observations were made. Furthermore, some evidence is found that vertical correlation lengths are longer in convective air masses. Key Points Mesoscale water vapor variability including the subgrid scale is characterized Scaling exponents in convective airmass are lower than in non-convective Correlation length in convective airmass is longer than in non-convective ©2013. American Geophysical Union. All Rights Reserved. 资助项目: SPP-1294
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63510
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institute of Meteorology, Ludwig-Maximilians University, Theresienstraße 37, Munich 80333, Germany; Institute of Atmospheric Physics, Deutsches Zentrum für Luft- und Raumfahrt Wessling, Oberpfaffenhofen, Germany
Recommended Citation:
Fischer L.,Craig G.C.,Kiemle C.. Horizontal structure function and vertical correlation analysis of mesoscale water vapor variability observed by airborne lidar[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)