scholarly journals Warm island effect observed in lake areas of the Badain Jaran Desert , China

Weather ◽  
2021 ◽  
Author(s):  
Liqiang Zhao ◽  
Xinran Yu ◽  
Wenjia Zhang ◽  
Xiaoyan Liang ◽  
Nai'ang Wang ◽  
...  
Keyword(s):  
Badain Jaran Desert ◽  
Island Effect

scholarly journals Warm Island Effect in the Badain Jaran Desert Lake Group Region Inferred from the Accumulated Temperature

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 153
Author(s):  
Xiaoyan Liang ◽  
Liqiang Zhao ◽  
Zhenmin Niu ◽  
Xingbin Xu ◽  
Nan Meng ◽  
...  
Keyword(s):  
Land Surface ◽  
Sensible Heat Flux ◽  
Scientific Basis ◽  
Heat Radiation ◽  
Badain Jaran Desert ◽  
Net Radiation ◽  
Sparse Vegetation ◽  
Island Effect ◽  
Accumulated Temperature ◽  
Desert Lake

The Badain Jaran Desert (BJD) is characterized by the coexistence of over 110 perennial lakes and thousands of megadunes in its southeast part. Unlike the cold island effect, we found a special phenomenon of the warm island effect in the lake group region of the BJD. However, the concept and formation mechanism remains unclear. In this study, based on observations of land surface processes in the area, we first used the daily mean temperature from 23 automated meteorological stations from 2010 to 2017 to calculate the mean daily temperature (T) ≥ 0 °C, T ≥ 10 °C accumulated temperature and negative accumulated temperature. Furthermore, using the net radiation from two eddy covariance measurement systems, characteristics of the net radiation between the lake and megadunes were analyzed. When comparing observed data in the lake group region to surrounding areas, accumulated temperature from all three meteorological stations in the lake group region were higher; the duration days of T ≥ 0 °C and T ≥ 10 °C were longer, whereas duration days of negative accumulated temperature were shorter. In addition, the initial dates for T ≥ 0 °C and T ≥ 10 °C accumulated temperature were earlier, whereas the end dates were delayed. Variations in heat were observed between stations in the lake group region that may be reflective of microclimate environments between lakes. The authors relate warm island formation in the BJD lake group region to (1) the heat carried by groundwater recharge to the desert lake groups has a great impact on the local temperature. (2) Net heat radiation to the atmosphere through sensible heat flux owing to sparse vegetation in the desert areas. Hence, heat resources are richer in the lake group region. This study aims to improve our understanding of the warm island effect from a comprehensive analysis of its intensity and distribution pattern around the lake group region as compared to its surroundings. In addition, the results from this study will provide a scientific basis for determining the source of lake water in the BJD.

Plant phenological responses to the warm island effect in the lake group region of the Badain Jaran Desert, northwestern China

2020 ◽  
Vol 57 ◽  
pp. 101066
Author(s):  
Xiaoyan Liang ◽  
Liqiang Zhao ◽  
Xingbin Xu ◽  
Zhenmin Niu ◽  
Wenjia Zhang ◽  
...  
Keyword(s):  
Northwestern China ◽  
Badain Jaran Desert ◽  
Island Effect

scholarly journals Detecting the Cool Island Effect of Urban Parks in Wuhan: A City on Rivers

2020 ◽  
Vol 18 (1) ◽  
pp. 132
Author(s):  
Qijiao Xie ◽  
Jing Li
Keyword(s):  
Remote Sensing ◽  
Negative Impact ◽  
Remote Sensing Data ◽  
Urban Parks ◽  
High Water ◽  
Water Bodies ◽  
Green Spaces ◽  
Heat Island ◽  
Island Effect ◽  
Urban Heat

As a nature-based solution, development of urban blue-green spaces is widely accepted for mitigating the urban heat island (UHI) effect. It is of great significance to determine the main driving factors of the park cool island (PCI) effect for optimizing park layout and achieving a maximum cooling benefit of urban parks. However, there have been obviously controversial conclusions in previous studies due to varied case contexts. This study was conducted in Wuhan, a city with high water coverage, which has significant differences in context with the previous case cities. The PCI intensity and its correlation with park characteristics were investigated based on remote sensing data. The results indicated that 36 out of 40 urban parks expressed a PCI effect, with a PCI intensity of 0.08~7.29 °C. As expected, larger parks with enough width had stronger PCI intensity. An increased density of hardened elements in a park could significantly weaken PCI effect. Noticeably, in this study, water bodies in a park contributed the most to the PCI effect of urban parks, while the vegetated areas showed a negative impact on the PCI intensity. It implied that in a context with higher water coverage, the cooling effect of vegetation was weakened or even masked by water bodies, due to the interaction effect of different variables on PCI intensity.

scholarly journals Cooling Effect of Different Land Cover Types: A Case Study in Xi’an and Xianyang, China

2021 ◽  
Vol 13 (3) ◽  
pp. 1099
Author(s):  
Yuhe Ma ◽  
Mudan Zhao ◽  
Jianbo Li ◽  
Jian Wang ◽  
Lifa Hu
Keyword(s):  
Land Cover ◽  
Surface Temperature ◽  
Urban Heat Island ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Cooling Effect ◽  
Heat Island ◽  
Land Cover Types ◽  
Island Effect ◽  
Urban Heat

One of the climate problems caused by rapid urbanization is the urban heat island effect, which directly threatens the human survival environment. In general, some land cover types, such as vegetation and water, are generally considered to alleviate the urban heat island effect, because these landscapes can significantly reduce the temperature of the surrounding environment, known as the cold island effect. However, this phenomenon varies over different geographical locations, climates, and other environmental factors. Therefore, how to reasonably configure these land cover types with the cooling effect from the perspective of urban planning is a great challenge, and it is necessary to find the regularity of this effect by designing experiments in more cities. In this study, land cover (LC) classification and land surface temperature (LST) of Xi’an, Xianyang and its surrounding areas were obtained by Landsat-8 images. The land types with cooling effect were identified and their ideal configuration was discussed through grid analysis, distance analysis, landscape index analysis and correlation analysis. The results showed that an obvious cooling effect occurred in both woodland and water at different spatial scales. The cooling distance of woodland is 330 m, much more than that of water (180 m), but the land surface temperature around water decreased more than that around the woodland within the cooling distance. In the specific urban planning cases, woodland can be designed with a complex shape, high tree planting density and large planting areas while water bodies with large patch areas to cool the densely built-up areas. The results of this study have utility for researchers, urban planners and urban designers seeking how to efficiently and reasonably rearrange landscapes with cooling effect and in urban land design, which is of great significance to improve urban heat island problem.

scholarly journals Projecting urban heat island effect on the spatial-temporal variation of microbial respiration in urban soils of Moscow megalopolis

2021 ◽  
pp. 147457
Author(s):  
V. Vasenev ◽  
M. Varentsov ◽  
P. Konstantinov ◽  
O. Romzaykina ◽  
I. Kanareykina ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Urban Heat Island ◽  
Urban Soils ◽  
Microbial Respiration ◽  
Urban Heat Island Effect ◽  
Heat Island ◽  
Island Effect ◽  
Urban Heat

Both pH and salinity shape the microbial communities of the lakes in Badain Jaran Desert, NW China

2021 ◽  
pp. 148108
Author(s):  
Joseph Frazer Banda ◽  
Qin Zhang ◽  
Linqiang Ma ◽  
Lixin Pei ◽  
Zerui Du ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Badain Jaran Desert ◽  
Nw China

Efficiency of parks in mitigating urban heat island effect: An example from Addis Ababa

2014 ◽  
Vol 123 ◽  
pp. 87-95 ◽  
Author(s):  
Gudina Legese Feyisa ◽  
Klaus Dons ◽  
Henrik Meilby
Keyword(s):  
Urban Heat Island ◽  
Addis Ababa ◽  
Urban Heat Island Effect ◽  
Heat Island ◽  
Island Effect ◽  
Urban Heat

East Asian monsoon variations on millennial scale during 35,000–25,000 a BP from records of grain size, CaCO3 and organic matter in the Badain Jaran Desert, China

2014 ◽  
Vol 8 (9) ◽  
pp. 6545-6553 ◽  
Author(s):  
Yihua Guo ◽  
Baosheng Li ◽  
Fengnian Wang ◽  
Yi Yang ◽  
Yuejun Si ◽  
...  
Keyword(s):  
Grain Size ◽  
Organic Matter ◽  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Badain Jaran Desert ◽  
Millennial Scale

Monitoring of seasonal change of urban heat island effect in Beijing using Aster data

2008 ◽  
Author(s):  
Guoyin Cai ◽  
Mingyi Du ◽  
Yong Xue
Keyword(s):  
Urban Heat Island ◽  
Seasonal Change ◽  
Urban Heat Island Effect ◽  
Heat Island ◽  
Aster Data ◽  
Island Effect ◽  
Urban Heat
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