The tenth IMSC, Beijing, China, 2007 - International Meetings on ...

the Agro_ecological zones of Zambia. <strong>The</strong> analysis shows that in Agro-ecological zone 1, low
intensity rainfall events are increaing and intense rainfall events are decreasing. In
Agro-ecological zone 2 low and moderate rain events are decreasing and intense rain events
are increasing. <strong>The</strong> annual rain events in Agro-ecological zone 1 are increasing at the rate of
0.629 events/year and decreasing in Agro-ecological zone 2 at the rate of 0.33 events/year.
<strong>The</strong> annual rainfall amounts in Agro-ecological zone 1 and 2 are decreasing at the rate of
1.038 and 3.269 mm/ year respectively.
Variability of Rainfall in Connection with the 3 - 5-Day Wave in Northern Africa in summer
Speaker: David MONKAM
David MONKAM
Department of Physics, Faculty of Science, University of Douala, P.O.Box: 24157 Douala - Cameroon
monkam1@yahoo.fr
A composite method is used to determine the spatial pattern of the westward propagating
3 - 5-day waves and the associated rainfall anomalies in northern Africa in summer,
throughout the period 1981-90. <strong>The</strong> rainfall anomalies increasing (decreasing) is associated
with the cyclonic (anticyclonic) circulation and negative (positive) geopotential height
anomalies. <strong>The</strong> waves increase rainfall in the band of latitudes 7.5°- 15°, around the ZCIT
mean position in summer, with a maximum near the Fouta-Djallon in Guinea and decrease
rainfall north of 15° and south of 7.5°. <strong>The</strong> rainfall anomalies increasing or decreasing depends
on the waves activities. For example in 1981 where the waves were active, the rainfall
anomalies composited were positive in the whole studied area, with strong values while in
1982 and 1983 where they were weak, the rainfall anomalies composited were negative south
of 10°.
Consideration of Drought at the Aji-chai Basin
Speaker: Davoud Naghizadeh
Davoud Naghizadeh
Head of Radjan Ab Consulting Engineers Co.
d_n_raz2006@yahoo.com
Mr. Rostamzadeh
(PHD Student of physical Geography, University of Tabriz, Iran)
Masumeh KHalkhali
(Master of physical Geography, University of Tabriz, Iran)
Climatic change is one of the natural characteristic of the atmospheric cycle that causes
abnormality and fluctuations in the trend of climatic parameters such as precipitation and heat.
Atmospheric abnormalities are very intensive in the most parts of the world and resulting
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