DOI: 10.1016/j.atmosres.2017.10.017
Scopus记录号: 2-s2.0-85033598280
论文题名: Cross tropopause flux observed at sub-daily scales over the south Indian monsoon regions
作者: Hemanth Kumar A. ; Venkat Ratnam M. ; Sunilkumar S.V. ; Parameswaran K. ; Krishna Murthy B.V.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 201 起始页码: 72
结束页码: 85
语种: 英语
英文关键词: Convection
; Cross tropopause flux
; STE processes
; Tropopause
Scopus关键词: Atmospheric thermodynamics
; Heat convection
; Meteorological instruments
; Natural convection
; Ozone
; Radar
; Radiosondes
; Troposphere
; Wind
; Deep convection
; Horizontal winds
; Lower troposphere
; Thermal structure
; Total mass flux
; Tropical tropopause
; Tropopause
; Upper troposphere
; Clouds
; atmospheric convection
; atmospheric dynamics
; cloud cover
; monsoon
; radiosonde
; thermal structure
; tropopause
; India
英文摘要: The effect of deep convection on the thermal structure and dynamics of the tropical tropopause at sub daily scales is investigated using data from radiosondes launched over two sites in the Indian Monsoon region (Gadanki (13.5°N, 79.2°E) and Trivandrum (8.5°N, 76.9°E)) conducted between December 2010 and March 2014. The data from these soundings are classified into 5 convective categories based on the past, present and future cloudiness over the launching region after the radiosonde has reached tropopause altitude. They are denoted as category 1 (no convection), category 2 (convection may occur in any of the next 3 h), category 3 (convection occurred prior 3 h), category 4 (convection terminated within 3 h of launching) and category 5 (convection persistent throughout the considered period). The anomalies from the background in temperature, relative humidity and wind speed are grouped into the aforementioned five different convective categories for both the stations. Cooling and moisture anomalies are found during the active convection (category 5). The horizontal wind speed showed a strong anomaly indicating the presence of synoptic scale features. Vertical wind obtained simultaneously from the MST radar over Gadanki clearly showed strong updraft during the active convection. The ozone profiles from ozonesondes launched during the same period are also segregated according to the above convective categories. During the active convection, high and low ozone values are found in the upper troposphere and the lower troposphere, respectively. The cross tropopause ozone mass flux and vertical wind at the tropopause and convective outflow level estimated from the ozonesonde, and MST radar/ERA-Interim data showed positive values indicating the transport of ozone between troposphere and stratosphere during deep convection. Similarly, the total mass flux crossing the cold point tropopause over Gadanki showed upward flux during the active convection. The variability of the cross tropopause mass flux is found to be higher over Gadanki compared to Trivandrum. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108990
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: National Atmospheric Research Laboratory, Gadanki, India; Space Physics Laboratory, Thiruvananthapuram, India; B1, Ceebros, 47/20, IIIrd Main Road, Chennai, India
Recommended Citation:
Hemanth Kumar A.,Venkat Ratnam M.,Sunilkumar S.V.,et al. Cross tropopause flux observed at sub-daily scales over the south Indian monsoon regions[J]. Atmospheric Research,2018-01-01,201