The effects of urbanization on temperature trends in different economic periods and geographical environments in northwestern China

Fěng, Fang; Jun-qin, Guo; Sun, Lei; Wang, Jing; Wang, Xinping

doi:10.1007/s00704-013-0944-7

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…In addition, compared with the original undeveloped environment, local thermal environment was in a relatively balanced state in 1978 and 1993 due to the combined effects of urban and oasis expansion, but local climate becomes warmer due to the dominant increased sensible heat after 1993. This result is consistent with the findings reported in previous investigation [48], in which the author considered that the urbanization of most cities in northwestern China resulted in considerable negative warming effects before 1978, but in evidently positive effects after this year.…”

Section: Journal Of Sensorssupporting

confidence: 93%

Effects on Local Temperature and Energy of Oasis City Expansion in Arid Area of Northwest China

et al. 2020

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The land surface model SURFEX 7.3 was used to study climate effect of urban expansion located in oasis in arid area of Northwest China by surface and 2 m urban heat island (UHI) intensity and available energy ratio (B). We performed a true regional development scenario and three assumed scenario simulations in 1978, 1993, 2004, and 2014, respectively. The results show that 2 m UHI always displays positive twin peaks during whole day, while surface UHI only displays a positive single peak with several hours during daytime at four seasons in the four years. Moreover, 2 m UHI intensity during night is higher than that during daytime, indicating that UHI intensity is contributed more by “trap effect” from urban complex geometry or anthropogenic heat and that surface UHI according to land surface temperature cannot reflect UHI comprehensively. The oasis-urban development resulted in local warming and increasing of B, and compared with the original undeveloped environment, local climate in the study area was in a relatively balanced state in 1978 and 1993 due to the “heating effect” of urban area and the “cooling effect” of oasis, but the offsetting effect from oasis would become weaker after1993.

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Section: Journal Of Sensorssupporting

confidence: 93%

Effects on Local Temperature and Energy of Oasis City Expansion in Arid Area of Northwest China

et al. 2020

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“…More recent studies (Committee of Chinese National Assessment Report on Climate Change, ) showed that the warming in the WC region has continued, and that a large increase has occurred over the past two decades. Over this same time period, it is thought that a stronger warming trend than that noted anywhere else in China prevailed in the northern part of WC (Li et al ., , ; Fang et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Attribution of temperature changes in Western China

Wang

Sun

et al. 2017

Intl Journal of Climatology

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Western China (WC) is located in the arid and semi-arid belt of the mid-latitudes. Understanding the causes of the large temperature increases experienced in this region is of great importance because both the fragile ecological environment and the human societies in WC are highly vulnerable to changes in climate. We conducted a detection and attribution analysis on the annual mean temperature using an optimal fingerprinting method by comparing observations based on homogenized station data with simulations conducted using the models that participated in the Coupled Model Intercomparison Project Phase 5 (CMIP5). The results show that the increase in the mean temperature can be attributed to human activities. The effect of anthropogenic (ANT) forcing can be detected in single-signal detection analyses when the response to the ANT forcing is compared directly with the observations. This effect can also be separated from the influence of the natural external forcing in two-signal analyses. The warming attributable to the ANT forcing explains most of the observed regional warming. The models appear to have underestimated the observed warming, suggesting that the projected future temperature increases based on raw output from the model simulations may have also been underestimated.

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“…For each city, four areas were generated using major and proportion land cover maps: (1) whole urban area (WUA), defined as the united areas of built-up areas of the four (in (3) changing urban area (CUA), referring to those pixels with proportions of built-up areas that changed at least once from 2000 to 2015 in the WUA -in other words, the WUA was divided into two parts, SUA and CUA; and (4) reference rural area, defined as the 50 km buffer around the WUA (removing urbanized pixels) (Imhoff et al, 2010). This distance (50 km) is closer than the distance between urban and reference rural meteorological stations in previous studies (generally between 50 and 150 km) (Fang et al, 2014;Wang et al, 2015a;Yang et al, 2011).…”

Section: Urbanization's Contribution At the Local Scalementioning

confidence: 99%

Assessing urbanization’s contribution to warming in mainland China using satellite-estimated air temperature data

Yao

Wang

Huang

et al. 2021

Progress in Physical Geography: Earth and Environment

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The global surface air temperature (Ta) has increased significantly in the past several decades. However, it remains disputable how much effect rapid urbanization has had on warming trends in mainland China. In this study, a gridded Ta dataset was created using satellite data. Then, a series of satellite-based methods to evaluate the contribution of urbanization to warming were developed. Subsequently, the contribution of urbanization to warming during 2001–2018 was estimated. The national average Ta was found to have increased significantly (0.23°C/decade) in mainland China. At the national scale, the contribution of urbanization to warming was negligible (less than 1%) since built-up areas account for only approximately 2.66% of the area of China. At the regional scale, the contribution of urbanization was also small in most areas and was even negative in some areas. At the local scale, the contributions of urbanization to warming were 53.18%, 54.30% and 47.25% for the mean, maximum and minimum Ta, respectively, averaged for 31 major cities. This study demonstrated that the contribution of urbanization to warming was significant at the local scale, while the contribution of urbanization to large-scale warming was limited. The contribution of urbanization was underestimated at the local scale but overestimated at the national and regional scales by many previous studies due to the sparse and uneven distribution of meteorological stations.

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The effects of urbanization on temperature trends in different economic periods and geographical environments in northwestern China

Cited by 8 publications

References 27 publications

Effects on Local Temperature and Energy of Oasis City Expansion in Arid Area of Northwest China

Effects on Local Temperature and Energy of Oasis City Expansion in Arid Area of Northwest China

Attribution of temperature changes in Western China

Assessing urbanization’s contribution to warming in mainland China using satellite-estimated air temperature data

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