scholarly journals A 6-year AMSU-based climatology of upper-level troughs and associated precipitation distribution in the Mediterranean region

2008 ◽  
Vol 113 (D15) ◽  
Author(s):  
B. M. Funatsu ◽  
C. Claud ◽  
J.-P. Chaboureau
2009 ◽  
Vol 137 (11) ◽  
pp. 3933-3959 ◽  
Author(s):  
Beatriz M. Funatsu ◽  
Chantal Claud ◽  
Jean-Pierre Chaboureau

Abstract A characterization of the large-scale environment associated with precipitating systems in the Mediterranean region, based mainly on NOAA-16 Advanced Microwave Sounding Unit (AMSU) observations from 2001 to 2007, is presented. Channels 5, 7, and 8 of AMSU-A are used to identify upper-level features, while a simple and tractable method, based on combinations of channels 3–5 of AMSU-B and insensitive to land–sea contrast, was used to identify precipitation. Rain occurrence is widespread over the Mediterranean in wintertime while reduced or short lived in the eastern part of the basin in summer. The location of convective precipitation shifts from mostly over land from April to August, to mostly over the sea from September to December. A composite analysis depicting large-scale conditions, for cases of either rain alone or extensive areas of deep convection, is performed for selected locations where the occurrence of intense rainfall was found to be important. In both cases, an upper-level trough is seen to the west of the target area, but for extreme rainfall the trough is narrower and has larger amplitude in all seasons. In general, these troughs are also deeper for extreme rainfall. Based on the European Centre for Medium-Range Weather Forecasts operational analyses, it was found that sea surface temperature anomalies composites for extreme rainfall are often about 1 K warmer, compared to nonconvective precipitation conditions, in the vicinity of the affected area, and the wind speed at 850 hPa is also stronger and usually coming from the sea.


2015 ◽  
Vol 47 (5-6) ◽  
pp. 1925-1941 ◽  
Author(s):  
Andrea Toreti ◽  
Paraskevi Giannakaki ◽  
Olivia Martius

2007 ◽  
Vol 12 ◽  
pp. 19-26 ◽  
Author(s):  
B. M. Funatsu ◽  
C. Claud ◽  
J.-P. Chaboureau

Abstract. Mediterranean storms and their associated upper level features are diagnosed here using Advanced Microwave Sounding Unit (AMSU) observations. AMSU-A channel 8 is used to identify upper-level intrusions of stratospheric air, which are often present upstream of heavy precipitating areas, while a combination of AMSU-B channels 3 and 5 is chosen to discriminate moderate to heavily precipitating areas. This precipitation detection method provides results that are in good agreement with TRMM rainfall product and independent ground-based precipitation data. These tools allow us to follow the concomitant evolution of two severe rainfall events in the Mediterranean region and associated upper-level features.


2012 ◽  
Vol 38 (2) ◽  
pp. 53-66 ◽  
Author(s):  
Christian Perennou ◽  
Coralie Beltrame ◽  
Anis Guelmami ◽  
Pere Tomàs Vives ◽  
Pierre Caessteker

2007 ◽  
Vol 114 (4) ◽  
pp. 263-267 ◽  
Author(s):  
H. Ayanoğlu ◽  
S. Bayazit ◽  
G. İnan ◽  
M. Bakır ◽  
A.E. Akpınar ◽  
...  

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