CLIMATE CLASSIFICATION AND DROUGHT ANALYSIS OF MERSIN

Yıl 2018, Cilt: 16 Sayı: 1, 1 - 26, 31.03.2018

Mehmet Ali Çelik , Ali Ekber Gülersoy

Öz

Studies show that the southern regions of Turkey, within which also Mersin
is located, would be greatly affected by possible climate change. According to
a report published by NASA, the most severe droughts of the last 900 years are
being witnessed in the Eastern Mediterranean Basin. In this context, the study
of the drought of Mersin in the Eastern Mediterranean Basin is of great
importance.

In this study, the drought analysis on, and the Thornthwaite climate
classification for Mersin and the surrounding area was carried out (1965-2014).
The Standardized Rainfall Index (SPI), Normal Percentage Index (PNI) and Erinç
Drought Index were used in our study. Drought analyses on monthly, annual and
seasonal scales were carried out. According to the Erinç drought index, extreme
climatic conditions have been experienced frequently over the past 15 years.
For example, the results of the SPI analysis show that there was a lack of
precipitation in Mersin across all months of the year 2008. Again, 2009 became
the driest year of the last 55 years. After 1968, the years 2001 and 2012 represent
the most humid climatic conditions in Mersin. However there is a significant
negative trend, especially throughout the winter months. 2001 and 2012 have
been the most humid periods in recent years. If the monthly SPI values of these
periods have been examined, it can be seen that the humidity of 2001 originated
from heavy rainfalls which had occurred in December. The precipitation which
fell in December 2001 was the highest rainfalls the last 55 years. Another
drought index used in our study is PNI. The PNI was calculated using monthly
rainfall data of 1965-2014 belonging to the Mersin station. It is seen that PNI
results were consistent with those obtained from Erinç and SPI models. The year
2008 is recorded as being arid according to the PNI analysis. According to the
PNI analysis, the year 2008 was observably arid while moist conditions for the
year 2012 are worthy of note.

Anahtar Kelimeler

Mersin, Drought, PNI, SPI

Kaynakça

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