Evolution of temperature of a case-II water and an inland lake around the Weihai area, Shandong province between 1994 and 2014

摘要

The Weihai area in Shandong province has undergone intensive changes of the landscape over the past years. The city has expanded to a high percentage but is still characterized by a huge number of lakes and surrounding coastal waters (case-II). In the study, we investigated the temperature changes of those lakes and the coastal zones as well as of some features at land over the past 20 years. We were able to measure subtle changes and trends considering the background of global warming issues by 1.4 degree within this time span. First of all, advanced processing schemes are utilized to conduct the necessary geometric correction and radiometric calibration of the data. In a second step, data have to be converted from DN values to emittance and finally to temperature values. Data are analyzed, and results of temperature changes and trends of different lakes and coastal waters are displayed and visualized together with robust statistical data in digital form. Results are finally interpreted and may be compared to other data sources such as fixed measuring points on the ground or results at other regions eventually at different latitudes.