Surface urban heat island variation on prevailing wind direction belt base on TM/ETM+ data in Shenyang, China

Base on the Landsat TM/ETM+ data on August of 2001 and 2010, the surface urban heat island (SUHI) intensity on prevailing wind direction belt using three sampling belts with 1 km width within the third circle freeway of Shenyang were calculated, and its relationships with land use types, source-sink distribution, normal differential vegetation index (NDVI), normal differential built-up index (NDBI), modified normal differential water index (MNDWI) were analyzed. The results show that land surface temperature (LST) and SUHI intensity increases from southeast to northwest for 3 belts. The mean LST on 3 belts is greater in 2010 than in 2001. The LST value and ratio of SUHI source areas on 3 belts are greater in 2010 than that in 2001, while SUHI decreases in 2010 compared with in 2001. There is a significant positive correlation between SUHI and NDBI in all 3 belts, and the correlation coefficients are 0.9123 in 2001 and 0.9103 in 2010. There is also a significant positive correlation between SUHI and SUHI sources area ratio in all 3 belts, the correlation coefficient is 0.9618 in 2001 and 0.9588 in 2010. However, there are no significant correlation relationships between SUHI and NDVI, SUHI and MNDWI, SUHI and source-sink boundary length, SUHI and each land use types.