Comunicación presentada en: EGU General Assembly 2011 celebrada del 3 al 8 de abril en Viena, Austria

Carrillo, Judith

Cuevas Agulló, Emilio

Guerra García, Juan Carlos

English

Carrillo Pérez, Judith

Agencia Estatal de Meteorología

Geophysical Research AbstractsVol. 13, EGU2011-9107, 2011EGU General Assembly 2011© Author(s) 2011Study of vertical distribution of temperature anomalies in the subtropicaltroposphere over Canary IslandsJudit Carrillo (1), Juan Carlos Guerra (1), and Emilio Cuevas (2)(1) Hydrometeorology Research Group, La Laguna University (Spain), (2) Izaña Atmospheric Observatory, AEMET (Spain)The vertical distribution of temperature in the lower subtropical troposphere shows layers with high stability asresult of different physical phenomena: inversion associated to the top of the marine boundary layer, trade windinversion layer, 0ºC inversion layer, and inversion temperature observed during African air mass intrusions.The main anomalies in the vertical distribution of temperature typically occur, over the subtropical ocean,between 1000 and 700 mb and have an important role in the local weather system and climate. CFAD (CounteredFrequency by Altitude Diagram) for lapse rate shows a double structure in this pressure interval, with an enhancedstability at 900 and 800 mb levels. This double inversion temperature structure in the lower troposphere has notbeen well studied. It shows other significant features that suggest several physical mechanisms may be involvedin its formation. Moreover, inspection of individual soundings reveals occurrence of temperature and specifichumidity perturbations near the 0ºC level, associated directly and indirectly with melting process within stratiformrain regions. However, due to the low frequency of precipitation in the Canary Islands, the perturbations at 0ºClevel are almost indiscernible in the mean. Another feature in the vertical distribution of temperature is related toenhanced stability layers observed around 500 mb during the summer time; these layers are related with the top ofthe Saharan Air Layer (SAL).The goal of this study has been to analyze and characterize the seasonal variation of the different temper-ature inversions and the physical mechanisms associated with each inversion. For that, a set of 26 years ofrawinsonde data at Tenerife Island has been used, analyzing the several inversion temperature layers found in eachindividual vertical profile.

Study of vertical distribution of temperature anomalies in the subtropical troposphere over Canary Islands

https://repositorio.aemet.es/bitstream/20.500.11765/7604/1/vertical_distribution_temperature.pdf

Study of vertical distribution of temperature anomalies in the subtropical troposphere over Canary Islands

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