The role of sea-land air thermal difference, shape of the coastline and sea surface temperature in the nocturnal offshore convection
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Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
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hdl:2117/17977
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Data publicació2013-01-31
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Abstract
Nocturnal precipitation cells and lines occur near the coastline in the whole Mediterranean basin in all seasons.
The precipitation events are mainly located in areas where coastal mountain ranges and rivers enhance
convergence though the interaction of nocturnal mesoscale and local flows (land breeze, katabatic and
drainages winds) with prevailing synoptic wind or with other mesoscale and local flows. The methodology used
here to study this phenomenon consists of three stages. First, the Tropical Rainfall Measuring Mission
(TRMM) radar satellite database is used to detect nocturnal precipitation near the coastline, from 18 to 09
UTC. An event is included in the study if the 3 hours accumulated precipitation detected by TRMM is
stationary near the coast, or has moved slightly onshore or offshore, and has lasted no more than six
consecutive hours. Second, the NCEP reanalysis database is used to describe the synoptic conditions and to
discard precipitation associated with synoptic events (large low pressure areas, dynamic polar fronts,
or troughs, for example). In the final step by using the version 3 of the Weather Research Forecast model,
we simulate and analyse some of the selected events to determine the role of the land
sea temperature
differences, the curvature of the coastline and the sea surface temperature.
The simulations confirm that the nocturnal precipitation studied in the Mediterranean basin near the
coastline is formed from the interaction between relatively warm and wet sea-air with the cold air mass from
drainage winds, as well as from the convergence of several drainage winds offshore. The mechanism is the same
that is used to explain nocturnal precipitation in tropical areas.
CitacióMazon, J.; Pino, D. The role of sea-land air thermal difference, shape of the coastline and sea surface temperature in the nocturnal offshore convection. "Tellus. Series A, dynamic meteorology and oceanography", 31 Gener 2013, vol. 65, núm. 20027.
ISSN0280-6495
Versió de l'editorhttp://dx.doi.org/10.3402/tellusa.v65i0.20027
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