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The Effect of Urban Heat Island on Climate Warming in the Yangtze River Delta Urban Agglomeration in China.

Huang Q, Lu Y - Int J Environ Res Public Health (2015)

Bottom Line: The average warming rates of huge cities and megalopolises are significantly higher than those of medium-sized cities and small cities, indicating that the UHI has a significant effect on climate warming (t-test, p < 0.05).Significantly positive correlations are found between the urbanization rate, population, built-up area and warming rate of average air temperature (p < 0.001).Urbanization has a measurable effect on the observed climate warming in the YRD aggravating the global climate warming.

View Article: PubMed Central - PubMed

Affiliation: College of Geography Sciences, Nanjing Normal University, Wenyuan Road, Xianlin University District, Nanjing, 210023, China. flyingfangzi@163.com.

ABSTRACT
The Yangtze River Delta (YRD) has experienced rapid urbanization and dramatic economic development since 1978 and the Yangtze River Delta urban agglomeration (YRDUA) has been one of the three largest urban agglomerations in China. We present evidence of a significant urban heat island (UHI) effect on climate warming based on an analysis of the impacts of the urbanization rate, urban population, and land use changes on the warming rate of the daily average, minimal (nighttime) and maximal (daytime) air temperature in the YRDUA using 41 meteorological stations observation data. The effect of the UHI on climate warming shows a large spatial variability. The average warming rates of average air temperature of huge cities, megalopolises, large cities, medium-sized cities, and small cities are 0.483, 0.314 ± 0.030, 0.282 ± 0.042, 0.225 ± 0.044 and 0.179 ± 0.046 °C/decade during the period of 1957-2013, respectively. The average warming rates of huge cities and megalopolises are significantly higher than those of medium-sized cities and small cities, indicating that the UHI has a significant effect on climate warming (t-test, p < 0.05). Significantly positive correlations are found between the urbanization rate, population, built-up area and warming rate of average air temperature (p < 0.001). The average warming rate of average air temperature attributable to urbanization is 0.124 ± 0.074 °C/decade in the YRDUA. Urbanization has a measurable effect on the observed climate warming in the YRD aggravating the global climate warming.

No MeSH data available.


Related in: MedlinePlus

Spatial distribution of the warming rate of average air temperature (a), urbanization rate (b), logarithm of the population (c), and built-up areas (d).
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ijerph-12-08773-f003: Spatial distribution of the warming rate of average air temperature (a), urbanization rate (b), logarithm of the population (c), and built-up areas (d).

Mentions: In the YRDUA, the warming rate of average air temperature had significant spatial variability although this variability was not continuous because most stations were located in the urban region (Figure 3a). From Shanghai to Jiangsu and Zhejiang Provinces and further to Anhui Province, the warming rate decreased gradually as the distance from Shanghai increased. In addition, there were two small peaks around Nanjing and Hangzhou. The weak warming rates mainly occurred at small- or medium-sized city stations located in Anhui Province and in southern Zhejiang Province, where the economy is less developed and has more rural areas. Overall, the spatial pattern of the warming rate was highly consistent with those of the urbanization rate, the population, and the built-up areas (Figure 3b–d). We will further discuss the relationship between the warming rate and the urbanization rate, population, and built-up area in the section “Factors affecting the warming rate”.


The Effect of Urban Heat Island on Climate Warming in the Yangtze River Delta Urban Agglomeration in China.

Huang Q, Lu Y - Int J Environ Res Public Health (2015)

Spatial distribution of the warming rate of average air temperature (a), urbanization rate (b), logarithm of the population (c), and built-up areas (d).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555247&req=5

ijerph-12-08773-f003: Spatial distribution of the warming rate of average air temperature (a), urbanization rate (b), logarithm of the population (c), and built-up areas (d).
Mentions: In the YRDUA, the warming rate of average air temperature had significant spatial variability although this variability was not continuous because most stations were located in the urban region (Figure 3a). From Shanghai to Jiangsu and Zhejiang Provinces and further to Anhui Province, the warming rate decreased gradually as the distance from Shanghai increased. In addition, there were two small peaks around Nanjing and Hangzhou. The weak warming rates mainly occurred at small- or medium-sized city stations located in Anhui Province and in southern Zhejiang Province, where the economy is less developed and has more rural areas. Overall, the spatial pattern of the warming rate was highly consistent with those of the urbanization rate, the population, and the built-up areas (Figure 3b–d). We will further discuss the relationship between the warming rate and the urbanization rate, population, and built-up area in the section “Factors affecting the warming rate”.

Bottom Line: The average warming rates of huge cities and megalopolises are significantly higher than those of medium-sized cities and small cities, indicating that the UHI has a significant effect on climate warming (t-test, p < 0.05).Significantly positive correlations are found between the urbanization rate, population, built-up area and warming rate of average air temperature (p < 0.001).Urbanization has a measurable effect on the observed climate warming in the YRD aggravating the global climate warming.

View Article: PubMed Central - PubMed

Affiliation: College of Geography Sciences, Nanjing Normal University, Wenyuan Road, Xianlin University District, Nanjing, 210023, China. flyingfangzi@163.com.

ABSTRACT
The Yangtze River Delta (YRD) has experienced rapid urbanization and dramatic economic development since 1978 and the Yangtze River Delta urban agglomeration (YRDUA) has been one of the three largest urban agglomerations in China. We present evidence of a significant urban heat island (UHI) effect on climate warming based on an analysis of the impacts of the urbanization rate, urban population, and land use changes on the warming rate of the daily average, minimal (nighttime) and maximal (daytime) air temperature in the YRDUA using 41 meteorological stations observation data. The effect of the UHI on climate warming shows a large spatial variability. The average warming rates of average air temperature of huge cities, megalopolises, large cities, medium-sized cities, and small cities are 0.483, 0.314 ± 0.030, 0.282 ± 0.042, 0.225 ± 0.044 and 0.179 ± 0.046 °C/decade during the period of 1957-2013, respectively. The average warming rates of huge cities and megalopolises are significantly higher than those of medium-sized cities and small cities, indicating that the UHI has a significant effect on climate warming (t-test, p < 0.05). Significantly positive correlations are found between the urbanization rate, population, built-up area and warming rate of average air temperature (p < 0.001). The average warming rate of average air temperature attributable to urbanization is 0.124 ± 0.074 °C/decade in the YRDUA. Urbanization has a measurable effect on the observed climate warming in the YRD aggravating the global climate warming.

No MeSH data available.


Related in: MedlinePlus