A study of the effect of changes in the area of Maharlu lake on climatic parameters of Shiraz and on land surface temperature of its surrounding areas

Document Type: Research Paper

Authors

1 meybod univesity

2 yazduniversity

Abstract

Remote sensing is increasingly used in studies of periodic changes of land use and land
surface temperature (LST) calculations. In this paper, the effect of change in the area of
Maharlu Lake on climatic elements, land surface temperature and vegetation cover in the
areas surrounding the lake were studied. To this end, the ETM + & TM sensor data of
LANDSAT satellite on May 22, 1987, May 17, 2000, March 20, 1999 and March 18, 2009
were used. The findings suggested that the average percentage of vegetation index in the
10-km buffer of the lake in 1987 (wet year) compared to 2000 (dry year) had dropped by
15% in the same month. In March 1999 and 2009, however, only a 3 percent decline was
recorded. The minimum, average and maximum LST in the periphery of the lake registered
an increase on the same dates during the wet period, but the temperature pattern was
identical in both periods. Most climatic elements increased in dry years compared to that of
the wet years. Also, comparing the statistical features of climatic elements in synoptic
stations of Shiraz at the time of capturing images and for the long-term average (1956-
2012) suggested a relatively lower increase in temperature during wet years compared to
the average long-term period. In most of the years when the precipitation was below
average (300 mm), the lake dried in May. In contrast, in years when the precipitation was
more than 400 mm, the lake received abundant rainfall in all months. The heavy
dependence of the lake on rainfall, the small size of the catchment and the seasonality of
rivers flowing into the lake make conditions extremely sensitive, critical and rainfalldependent

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