DOI: 10.1016/j.atmosres.2018.03.012
Scopus记录号: 2-s2.0-85044471928
论文题名: Diurnal and long-term variation of instability indices over a tropical region in India
作者: Chakraborty R. ; Basha G. ; Venkat Ratnam M.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 207 起始页码: 145
结束页码: 154
语种: 英语
英文关键词: Instability
; Long-term trend
; Monsoon onset
; Radiosonde
; Seasonal diurnal variation
Scopus关键词: Atmospheric thermodynamics
; Plasma stability
; Potential energy
; Radiosondes
; Rain
; Convective available potential energies
; Convective inhibition
; Diurnal variation
; Lifting condensation levels
; Long-term trend
; Meteorological parameters
; Monsoon onset
; Seasonal variation
; Stability
英文摘要: Climatology of atmospheric instability is studied over Gadanki using high-resolution radiosonde launched daily during April 2006 to April 2017. The diurnal and seasonal variation of instability parameters is discussed in relation with surface meteorological parameters. Seasonal variations depict strong variability in instability which is masked by stronger diurnal variation with descending Lifting Condensation Level (LCL) and Level of Free Convection (LFC) between 11 and 18 IST resulting in high Convective Available Potential Energy (CAPE) values and heavy rainfall. On a seasonal basis, parcel parameters are high during the late monsoon and post-monsoon while the instability parameters like Total Totals index (TT) and Vertical Totals index (VT) show highest values in the pre-monsoon associated with strong convection. LFC and LCL start descending with ascent in Equilibrium Level (EL) before the monsoon onset. However after the onset, atmospheric instability falls sharply as supported by decreasing TT, VT and CAPE with increasing LI. The 11-year long-term variation depicts slightly elevated LFC and LCL and declining EL values indicating a decrease in the instability with a decrease in CAPE and K Index (KI) and increase in Lifted Index (LI) and Convective Inhibition (CIN). © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108897
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: National Atmospheric Research Laboratory, Gadanki, Tirupati 517502, India
Recommended Citation:
Chakraborty R.,Basha G.,Venkat Ratnam M.. Diurnal and long-term variation of instability indices over a tropical region in India[J]. Atmospheric Research,2018-01-01,207