DOI: 10.1002/jgrd.50839
论文题名: Characteristics of the subtropical tropopause region based on long-term highly resolved sonde records over Tenerife
作者: Rodriguez-Franco J.J. ; Cuevas E.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 10754
结束页码: 10769
语种: 英语
英文关键词: double tropopauses
; dynamical tropopause
; ozone
; subtropics
; tropopause climatology
; tropopause inversion layer
Scopus关键词: Climatology
; Computer hardware description languages
; Inversion layers
; Meteorological instruments
; Ozone
; Tropical engineering
; Tropics
; Troposphere
; Weather forecasting
; Analysis and evaluation
; Baroclinic instability
; double tropopauses
; dynamical tropopause
; European center for medium-range weather forecasts
; Potential temperature
; Potential vorticity
; subtropics
; Clouds
; baroclinic instability
; climatology
; data set
; inversion layer
; jet stream
; marine atmosphere
; ozone
; ozonesonde
; regional climate
; seasonality
; subtropical region
; tropopause
; vorticity
; weather forecasting
; wind velocity
; zonal wind
; Atlantic Ocean
; Atlantic Ocean (North)
; Canary Islands
; Santa Cruz de Tenerife [(PRV) Canary Islands]
; Spain
; Tenerife
英文摘要: This study examines the structure of the subtropical tropopause region over Tenerife (the Canary Islands, Spain; 28°N, 16°W) based on a 20 year (1992-2011) ozonesonde data and European Center for Medium-Range Weather Forecasts ERA-Interim potential vorticity (PV) and zonal wind speed reanalysis. High-resolution vertical profiles allowed a detailed description of the subtropical tropopause break and the associated subtropical jet stream (STJ), where models fail to properly simulate the upper troposphere-lower stratosphere (UTLS). The subtropical UTLS is revealed as a complex atmospheric region with a thickness ∼8 km, which is examined through the analysis and evaluation of four different tropopause definitions: thermal (TT), cold point, ozone (OT), and dynamical (DT) tropopauses. A novel method to determine the DT based on the vertical gradient of Lait's modified PV is presented and the concept of a second DT has been introduced for the first time. Monthly climatologies of tropopause height and potential temperature are calculated for double and single tropopause events. The 14.3 km height level is used to differentiate between tropical and extratropical UTLS regimes, intimately linked to the position of the STJ. There is fairly good consistency between all the defined tropopauses under the double tropopause scheme, except in spring, when the OT is observed at lower levels due to frequent baroclinic instabilities in the upper troposphere. As concerns to single tropopause events, the same pattern is found from April to June, reflecting the influence of analogous processes during these months. In winter, altitude differences between OT, DT, and TT resulted from poleward STJ excursions forced by blocking systems over the North Atlantic. Analysis of the tropopause inversion layer showed distinctive features for tropical and midlatitude tropopauses. Key Points The subtropical tropopause region is thoroughly characterized Several PV values are possible to define an isentropic barrier in the subtropics Distinctive features for midlatitude and tropical tropopauses are revealed ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63237
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: Izaña Atmospheric Research Center, AEMET, La Marina 20, 6 Planta, ES-38071 Santa Cruz de Tenerife, Spain
Recommended Citation:
Rodriguez-Franco J.J.,Cuevas E.. Characteristics of the subtropical tropopause region based on long-term highly resolved sonde records over Tenerife[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)