Journal of Atmospheric and Environmental Optics ›› 2020, Vol. 15 ›› Issue (2): 143-153.

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Evolution and Prediction of Thermal Environment Pattern in Nanjing Based on CA-Markov Model

GUO Jiqiang, PAN Jie   

  1. College of Forestry, Nanjing Forestry University, Nanjing 210037, China
  • Online:2020-03-28 Published:2020-03-24

Abstract: Based on Landsat5 TM and Landsat8 OLI/TIRS data, the land surface temperature of Nanjing city is 
retrieved by radiative transfer equation, and the thermal landscape pattern evolution is analyzed 
by landscape pattern indices. Then the thermal environment change of Nanjing in 2024 
is predicted by CA-Markov model. The results show that, from 2000 to 2017, the area of high 
temperature zone in Nanjing increased by 456.55 km2 and 149.75%, and the area of mid-temperature 
zone, low and sub-low temperature zone decreased continuously. On the patch-class level, the 
dominance of high temperature patch in thermal landscape pattern was rising rapidly. From 2000 
to 2010, the fragmentation and complexity of the high temperature patch decreased, which is 
contrary to that from 2010 to 2017. On the landscape level, the fragmentation degree of  
thermal landscape pattern in Nanjing decreased, the area of various patches tended to be 
uniform, and the degree of aggregation among patches increased. It is shown that the 
simulation result of thermal environment of Nanjing in 2017 based on CA-Markov model 
has a high simulation accuracy, with the average error of each heat island type less than 
6% and the Kappa index of the model of 78.36%. The prediction results of thermal environment 
of Nanjing in 2024 show that the area of high temperature and sub-high temperature zone will 
increase by 94.96 km2 and 126.91 km2 respectively, and the area of mid-temperature zone, 
low and sub-low temperature zone will continue to decrease.

Key words: heat island effect, thermal environment, CA-Markov model, Nanjing