Trend changes of African airmass intrusions in the marine boundary layer over the subtropical Eastern North Atlantic region in winter
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10.1111/j.1600-0889.2010.00524.x
Inclou dades d'ús des de 2022
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hdl:2117/12016
Tipus de documentArticle
Data publicació2011-04-01
EditorJohn Wiley & Sons
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Abstract
African dust intrusions in the marine mixing layer of the Eastern North Atlantic subtropical region (23.5◦N to 35◦N)
are favoured in winter when the eastern edge of the Azores High covers Southwestern Europe and North Africa. In situ
ground pressure observations and reanalysis from National Centers for Environmental Prediction/National Center for
Atmospheric Research (NCEP/NCAR) and European Centre forMedium-RangeWeather Forecasts (ECMWF) indicate
that the Azores High has strengthened and shifted eastward in winter over the last three decades. This is evidenced by
the increase over time of the Madrid–Tenerife Index which is defined as the geopotential height anomaly difference at
1000 mb between Tenerife (28.5◦N; 16.3◦W) and Madrid (40.5◦N; 3.5◦W) in winter and of the African Index which is
defined as the residence time over Africa of air mass trajectories entering the subtropical Eastern North Atlantic Ocean.
Barcelona Supercomputing Center/Dust Regional AtmosphericModel (BSC-DREAM) dust regional model simulations
from 1958 to 2006 were performed, assuming that the soil characteristics of dust sources remained unchanged over time.
Simulated winter dust concentration levels are well correlated (0.67) with the available background observations for
the 1998–2004 period. The model results show a two-fold increase in winter dust concentrations over the 1980–2006
period with respect to the 1958–1979 period, corresponding to the strengthening and eastward shift of the Azores
High.
CitacióAlonso-Perez, S. [et al.]. Trend changes of African airmass intrusions in the marine boundary layer over the subtropical Eastern North Atlantic region in winter. "Tellus. Series B: Chemical and physical meteorology", 01 Abril 2011, vol. 63, núm. 2, p. 255-265.
ISSN1600-0889
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