A Survey of Climatic Changes of Namak Lake Basin in the Late Quaternary

Two important characteristics، alternate climatic fluctuations and human being appearance، distinguish Quaternary from other geology periods. These climatic changes have shown increase and decrease of glacialical scope in high latitudes، but there are different and opposite theories about climatic situation of low latitudes in Iran during glacial periods. In this study the climate of the last glacial era of Namak Lake basin، located in North central Iran was investigated by using the past geomorphic evidence and statistic analyzes. Present temperature and rainfall of this basin was studied and its related displacements were plotted. Glacial cirques and lake terraces as geomorphic evidences were also studied. Regarding the snowline in different points of basin، the temperature and rainfall of the basin in Wurm glacial period was rebuilt by Wright method and the changes related to the present time was studied. Morphogenetic plans of the basin in two periods were prepared by using annual rainfall and temperature and Politer method. Results show %48 (180 mm) increase in annual rain and a 5. 6oC decrease in Wurm glacial era comparable to present. Reviewing geomorphic evidence out of climatic changes including NamakLake terraces، travertine mines، pediment vast and human civilization have proven the results.