Connections between the Intertropical Convergence Zone and other climatic features in Central America
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2013-05-30Autor
Hidalgo León, Hugo G.
Alfaro Martínez, Eric J.
Durán Quesada, Ana María
Amador Astúa, Jorge Alberto
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This work explores statistical connections between the displacements and strength of the Intertropical Convergence
Zone (ITCZ) and the Caribbean Low Level Jet (CLLJ). Indicators of the position and of the strength of the ITCZ
include the latitude (LATC) and longitude (LONC) of the center of mass of precipitation and the domain
precipitation (Pdomain) in a region bounded by coordinates -10 and 25 degrees latitude and -100 and -55 degrees
longitude, respectively. Preliminary analyses show that there is a strong correlation (0.82) between summer (JJA)
LATC and JJA CLLJ index, and this correlation is lower in other seasons (0.63 for Autumn, 0.20 for Winter and
0.49 for Spring) . These correlations were verified in the zonal wind composites at 925 hPa for the 5 lowest and 5
highest years of LATC. LONC does not seem to have the same strong relationship with the CLLJ. At daily level,
composites show precipitation in the Central America region is influenced by Pdomain, LATC, CLLJ index, and to
a less extent to LONC. Composites of Sea Surface Temperature for the 5 years of highest and lowest LATC show
some relationship with ENSO, although there is a disproportionate influence of the 1997-98 El Niño that may be
affecting the results. There is however a consistent feature: during years of high LATC, there are warm anomalies in
the tropical Atlantic off the coast of Venezuela, that are not present during years of low LATC.
Poster presentado en AGU 2013 Meeting of the Americas. Cancun, México, del 14 al 17 de mayo. También disponible en http://moa.agu.org/2013/eposters/eposter/a21b-03/
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- Meteorología [501]
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