Recent climatological trend of the Saharan Heat Low and its impact in West African climate

Christophe Lavaysse 1 Cyrille Flamant 2 Arnato Evan 3 Serge Janicot 4 Marco Gaetani 2
1 Climate Change Unit [Ispra]
2 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
3 SIO - Scripps Institution of Oceanography
4 PARVATI - Processus de la variabilité climatique tropicale et impacts
LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
Abstract : The saharan Heat low (sHl) plays a crucial role in the West african Monsoon in spring and summer. the recent trend in sHl activity has been analysed using two sets of numerical weather prediction reanalysis. a local increase during the 90’s has been found in the two sets of temperature. this increase is stronger within the heat low region than the surrounding areas. this change is accompanied by a modification of the large scale and slow increase of temperature, but we do not observe a change in the filtered signal under 25 days. Despite a large variability of the temporal trends between 15 climate models from the CMip5 project, the trend is observed using the ensemble mean. nevertheless, the spatial and temporal evolutions of the Hl activities display a large difference between the reanalysis and climate models. the impacts and atmospheric variabilities have been compared in reanalysis and climate models and reveals different behaviours of the climate models to represent the west african monsoon interactions with Hl pulsations.
Keywords : Weather forecasting Saharan heat-low dynamics Monsoon flow Climate Models West Africa Rainfall Temperature
Document type :
Poster communications
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https://hal-insu.archives-ouvertes.fr/insu-01183132
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Submitted on : Monday, August 10, 2015 - 11:45:03 AM
Last modification on : Wednesday, August 7, 2019 - 12:18:06 PM
Long-term archiving on : Wednesday, November 11, 2015 - 10:12:58 AM

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Christophe Lavaysse, Cyrille Flamant, Arnato Evan, Serge Janicot, Marco Gaetani. Recent climatological trend of the Saharan Heat Low and its impact in West African climate. Our Common Future Under Climate Change, International Scientific Coference, Jul 2015, Paris, France. pp.P-3330-46, 2015. ⟨insu-01183132⟩

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