DOI: 10.1016/j.atmosres.2017.11.013
Scopus记录号: 2-s2.0-85034603640
论文题名: Investigation of Kelvin-Helmholtz Instability in the boundary layer using Doppler lidar and radiosonde data
作者: Das S.K. ; Das S.S. ; Saha K. ; Murali Krishna U.V. ; Dani K.K.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 202 起始页码: 105
结束页码: 111
语种: 英语
英文关键词: Boundary layer
; CAIPEEX
; Doppler wind lidar
; KHI
Scopus关键词: Boundary layers
; Doppler effect
; Flow visualization
; Optical radar
; Precipitation (meteorology)
; Radiosondes
; Stability
; CAIPEEX
; Doppler lidar measurements
; Doppler wind lidar
; High relative humidities
; Kelvin-helmholtz instabilities
; Planetary boundary layers
; Precipitation enhancement
; Turbulence characteristics
; Atmospheric thermodynamics
; boundary layer
; data processing
; Doppler lidar
; Kelvin-Helmholtz instability
; radiosonde
; turbulence
; wavelet analysis
; wind
英文摘要: Characteristics of Kelvin Helmholtz Instability (KHI) using Doppler wind lidar observation have rarely been reported during the Indian summer monsoon season. In this paper, we present a case study of KHI near planetary boundary layer using Doppler wind lidar and radiosonde measurements at Mahabubnagar, a tropical Indian station. The data was collected during the Integrated Ground Observation Campaign (June–October 2011) under the Cloud Aerosol Interaction and Precipitation Enhancement EXperiment-2011. The continuous wind lidar observation during 10–16 August 2011 shows there is an increase in carrier-to-noise ratio values near planetary boundary layer from 03:00 to 11:00 LT on 13 August; reveals the formation of KHI. There is a strong power bursts pattern corresponding to high turbulence characteristics in the early half of the day. The KHI temporal evolution from initial to dissipating stage is observed with clear variation in the carrier-to-noise ratio values. The observed KHI billows are in the height between ~ 600 and ~ 1200 m and lasted for about 7.5 h. The vertical velocity from Doppler lidar measurement shows the presence of updrafts after breaking of KHI in the boundary layer. The presence of strong wind shear, high stability parameter, low Richardson number and high relative humidity during the enhanced carrier-to-noise ratio period indicates the ideal condition for the formation and persistence of this dynamic instability. A typical characteristic of trapped humidity above the KHI billows suggest the presence of strong inversion. A wavelet analysis of 3-dimensional wind components show dominant periodicity of ~ 45–65 min and the periodicity in vertical wind is more prominent. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108978
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Indian Institute of Tropical Meteorology, Pune, 411008, India; Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, 695022, India; CICS, University of Maryland, College Park, MD 20740-3823, United States; NOAA National Center for Environmental Information (NCEI)MD 20910, United States
Recommended Citation:
Das S.K.,Das S.S.,Saha K.,et al. Investigation of Kelvin-Helmholtz Instability in the boundary layer using Doppler lidar and radiosonde data[J]. Atmospheric Research,2018-01-01,202