scholarly journals Impact of vegetation removal and soil aridation on diurnal temperature range in a semiarid region: Application to the Sahel

2007 ◽  
Vol 104 (46) ◽  
pp. 17937-17942 ◽  
Author(s):  
L. Zhou ◽  
R. E. Dickinson ◽  
Y. Tian ◽  
R. S. Vose ◽  
Y. Dai
Keyword(s):  
Diurnal Temperature Range ◽  
Semiarid Region ◽  
Diurnal Temperature ◽  
Temperature Range ◽  
Vegetation Removal

scholarly journals Trends in Temperature and Rainfall Extremes near the Artificial Sobradinho Lake, Brazil

2018 ◽  
Vol 33 (3) ◽  
pp. 426-440 ◽  
Author(s):  
Maria Monalisa Mayara Silva Melo ◽  
Carlos Antonio Costa dos Santos ◽  
Ricardo Alves de Olinda ◽  
Madson Tavares Silva ◽  
Raphael Abrahão ◽  
...  
Keyword(s):  
Diurnal Temperature Range ◽  
Hydroelectric Plant ◽  
Maximum Temperature ◽  
Semiarid Region ◽  
Hydroelectric Power ◽  
Economic Sectors ◽  
Artificial Lake ◽  
Diurnal Temperature ◽  
Temperature Range ◽  
Hot Days

Abstract The formation of artificial lake due construction of a hydroelectric plant causes irreversible environmental impacts. Studies associated with these artificial lakes for the Brazilian semiarid region are still insufficient. Thus, the objective of this study is to provide new information on the trends of climatic extremes, dependent on rainfall and air temperature, for the Sobradinho Hydroelectric Power Plant (SHPP) lake region, through the analysis of climate change indices. This study is particularly important for the SHPP region because microclimate changes have significant impacts on the natural, social and economic sectors. For the two analyzed stations (Bebedouro-PE and Mandacaru-BA), it is not possible to affirm that the construction of the SHPP artificial lake altered the local microclimate. Trends of increase in maximum temperature, the number of hot days and diurnal temperature range were noticed. However, the rise of these indices cannot be attributed to the formation of the SHPP lake. The influence of the SST of Tropical Oceans on the temporal behavior of some of the indices used in this study may have contributed to increases in hot days and nights, maximum temperature, diurnal temperature range and consecutive dry days over the region.

scholarly journals The Spatiotemporal Patterns of Climate Asymmetric Warming and Vegetation Activities in an Arid and Semiarid Region

Climate ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 145
Author(s):  
Tong Heng ◽  
Gary Feng ◽  
Ouyang Ying ◽  
Xinlin He
Keyword(s):  
Diurnal Temperature Range ◽  
Vegetation Index ◽  
Extreme Values ◽  
Terrestrial Ecosystems ◽  
Spatiotemporal Patterns ◽  
Semiarid Region ◽  
Diurnal Temperature ◽  
Temperature Range ◽  
Warming Rate ◽  
Nighttime Warming

Asymmetric warming was bound to have a major impact on terrestrial ecosystems in arid regions during global warming. Further study was necessary to reveal the spatiotemporal patterns of asymmetric warming in Xinjiang; this study analyzed the climate and normalized difference vegetation index (NDVI) data (2000–2020). The change trends of the day and nighttime warming (DNW), seasonal warming, and the diurnal temperature range in northern Xinjiang (S1) and southern Xinjiang (S2) were determined. The findings indicated that the DNW rate showed a significant (p < 0.05) upward trend, especially in winter. The nighttime warming rate (0.65 °C (decade)−1) was faster than the daytime warming rate (0.4 °C (decade)−1), and the diurnal temperature range between daytime and nighttime exhibited a decreasing trend. The diurnal temperature range was the highest in spring and the lowest in winter. Extreme values of the diurnal temperature range appeared in autumn (48.6 °C) and winter (12.3 °C) and both in S1. The Tmin in S1 had an abruption trend in 2006–2017, the Tmax in S2 had an abruption trend in 2005–2011, and the probability of spatial abruption in S1 was higher than that in S2. The partial correlation between the NDVI and Tmin was significantly higher than that between the NDVI and Tmax in the area where the significance test passed; therefore, asymmetric nighttime warming had a greater impact on the NDVI than the asymmetric daytime warming.

scholarly journals Spatiotemporal Analysis of Diurnal Temperature Range: Effect of Urbanization, Cloud Cover, Solar Radiation, and Precipitation

Climate ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 89 ◽  
Author(s):  
Andri Pyrgou ◽  
Mattheos Santamouris ◽  
Iro Livada
Keyword(s):  
Solar Radiation ◽  
Diurnal Temperature Range ◽  
Cloud Cover ◽  
Longwave Radiation ◽  
Ultraviolet B ◽  
Anthropogenic Sources ◽  
Daily Minimum Temperature ◽  
Urban Station ◽  
Diurnal Temperature ◽  
Temperature Range

High daily temperatures in the Mediterranean and Europe have been documented in observation and modeling studies. Long-term temperature data, from 1988 to 2017, from a suburban station and an urban station in Nicosia, Cyprus have been analyzed, and the diurnal temperature range (DTR) trend was investigated. The seasonal Mann–Kendall test revealed a decreasing DTR trend of −0.24 °C/decade at the urban station and −0.36 °C/decade at the suburban station, which were attributed to an increase in the daily minimum temperature. Variations in precipitation, longwave radiation, ultraviolet-A (UVA), ultraviolet-B (UVB), cloud cover, water vapor, and urbanization were used to assess their possible relationship with regional DTR. The clustering of daytime and night-time data showed a strong relationship between the DTR and observed cloud cover, net longwave radiation, and precipitation. Clouds associated with smaller shortwave and net longwave radiation reduce the DTR by decreasing the surface solar radiation, while atmospheric absolute humidity denotes an increased daytime surface evaporative cooling and higher absorption of the short and longwave radiation. The intra-cluster variation could be reduced, and the inter-cluster variance increased by the addition of other meteorological parameters and anthropogenic sources that affect DTR in order to develop a quantitative basis for assessing DTR variations.

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