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

Tong Heng,Xinlin He,Gary Feng,Ying Ouyang

doi:10.3390/cli8120145

Tong Heng, Xinlin He + Show 2 more

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https://doi.org/10.3390/cli8120145

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Journal: Climate	Publication Date: Dec 10, 2020
Citations: 3	License type: CC BY 4.0

Affiliation: Mississippi State University, Shihezi University

Abstract

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.

Highlights

IntroductionWith the increase in global average temperature, there is growing evidence suggesting that asymmetric patterns of day and nighttime warming (DNW) and seasonal warming are common in the warming process [4,5,6,7]
Since the 1950s, terrestrial ecosystems have experienced a continuous warming process [1,2,3].With the increase in global average temperature, there is growing evidence suggesting that asymmetric patterns of day and nighttime warming (DNW) and seasonal warming are common in the warming process [4,5,6,7]
The results of this study showed that the warming rates of Tmax and Tmin in the S2 area were 0.3 and 0.5 ◦ C−1, respectively, which were higher than those reported by Li et al [10]

Summary

Introduction

With the increase in global average temperature, there is growing evidence suggesting that asymmetric patterns of day and nighttime warming (DNW) and seasonal warming are common in the warming process [4,5,6,7]. This phenomenon is called asymmetric warming [8]. In the past 40 years, the average surface temperature in China has risen by 1.1 ◦ C, which is higher than the global warming rate [16,17,18,19,20]

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