editorial team

Akpinar and Akpinar
21
coldest values in the Erzurum. Kars city is the most
humid area almost throughout the period while Igdir
is the least humid area. Wind speed reaches the
highest values in the Erzurum and the lowest values
in the Igdir. Pressure reaches the highest values in
the Igdir and the lowest values in the Kars. Bitlis
city is the most rainfall almost throughout the
period while Igdir is the least rainfall area. Direct
solar radiation reaches the highest values in the
Tunceli and the lowest values in the Agri.
Sunshine duration reaches the highest values in the
Van and the lowest values in the Bitlis.
(2) Regression models are presented for the weather
data at the period 1994–2003 of thirteen cities in
the east Anatolia region of Turkey. The best fits
were for the monthly average temperature,
maximum–minimum temperature, relative
humidity, wind speed, solar radiation and sunshine
duration. The model for the monthly average
pressure and rainfall is also adequate. As seen
from Figs 3, 5, 7, 9, 11, 13, 15, 17, 19, there are
good agreements between predicted and observed
values. In other words the new equations are able
to predict effectively the monthly average
variations of observed values. The three good
indicators of solar and wind energy potential,
temperature, maximum–minimum temperature,
global radiation and sunshine hours have very high
averages. These high values are maintained for a
considerable part of the year. The functions
presented for the parameters should enable the
determination of specific parameter values and the
prediction of missing values.
(3) The factors thought to be effective on the climatic
differences mentioned above may result from the
features of the investigated cities. The factors
thought to be effective on the differences
determined in the present study are briefly canopy
and evapotranspiration effects, elevation difference
between the areas and surface roughness, radiation
and reflection factors, smoke and dust, the duration
and color of snow cover on the ground, wind
direction and other anthropogenic effects of the
investigated city. Depending on the location of the
city center, prevalent easterly and northerly winds
in this area is effective on temperatures and
humidity, which can decrease temperatures and
increase humidity. As is known, there is a true
relationship between the population and
temperature in a city center. This effect may be
smaller compared to those aforementioned,
because of the relatively low population and the
city lacks of any industrial facilities that may
influence the temperature in the city.
This study is expected to be useful in analyzing and
interpreting the environmental and energy related
issues.
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Journal of Urban and Environmental Engineering (JUEE), v.4, n.1, p.9-22, 2010