عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Oxygen isotope records in archives of lake sediments are as common tools to reconstruct palaeoenvironments. In the paper we discuss the records in the Lakes Zeribar, Mirabad, Bakhtegan, and Parishan to investigate Iran climatic conditions in little ice age. Bet ween 1350 to 1850 years ago, synchronized with little ice age, some alterations can be observed in the amounts of oxygen isotope in these lakes. On the lakes Zeribar and Mirabad the amounts of oxygen isotope ( Oâ 18) have extended toward more positive values. At the same time the values in lakes Parishan and Bakhtegan have extended toward more negative values. The isotope records indicate that climatic coditions of Zeribar and Mirabad was drier than present conditions. Isotope records also indicate that lakes Parishan and Bakhtegan experienced cooler and wetter conditions than those of the present days in the age. The hetrogeny of the events in isotope records represents atmospheric circular pattern variations in that age on the Iran. The evidence indicates that the event may be accompanied by the movements of westerlies to the far southern latitudes and its subsequent development and strengthening of their activities on the regions.