جستجوی مقالات مرتبط با کلیدواژه « Divergence&rdquo » در نشریات گروه « جغرافیا »

In the present study, the temperature parameter has been reconstructed by using the annual growth rings of juniper trees (Juniperus polycopos) in Tengel Raver habitat in the north of Kerman province. Therefore, samples of 95 trees were taken using a growth gauge drill. Counting the number, measuring the width of the rings and matching the time between the growth curves of the trees was done by LINTAB desktop and TSAP Win software with an accuracy of 0.01 mm. The chronology of the region was constructed, detrended and standardized in ARSTAN software for 517 years (1500-2017) and its quality was checked with Cumulative Signal Statistics (EPS) and finally Residual chronology was selected for reconstruction. The relationship between climate and the width of the rings was measured using data from Kerman and Zarand stations and CRU TS4.01 data for the last 116 years of Iran. The results showed that the temperature of the months before the growing season and the month of March at the beginning of the growing season have a positive effect on the width of the rings, and the temperature of the months of April, May and June have a negative effect. Also, the investigations showed the occurrence of the issue of divergence between temperature and growth rings in the last 25 years and the region being affected by global warming in the last two decades. The reconstructed temperature showed a general decrease of 0.5 to 1.5 degrees in the two periods of 1750-1800 and 1700-1500 AD simultaneously with the Little Ice Age event in Europe for the studied area.