Extreme High-temperature in Summer and Its Impacts on Vegetation in East China

doi:10.3969/j.issn.1000-6362.2017.01.005

Abstract

Abstract: Based on daily maximum surface air temperature data during 1971?2006 and normalized difference vegetation index (NDVI) data of AVHRR during 1981?2006, the frequency and average duration days of summer extreme heat wave were analyzed by using method of Morlet wavelet transform, as well as the periodic variation about the occurrence times of extreme high-temperature. Meanwhile, the relationship between the occurrence times of extreme high-temperature and NVDI was analyzed by using Singular Value Decomposing (SVD) in East China. The results showed that, (1) the frequency of summer extreme heat wave in East China showed that southern region was higher than the northern, the western was higher than the eastern, the plain region was higher than the mountainous region. But high value areas of average duration days were closed to the sea. (2) Occurrence times of summer extreme high-temperature in East China were mainly affected by three temporal scales which were 22 years, 9 years and 4 years. Among three temporal scales, the scale fluctuation around 22 years was the first primary period with a relatively stable oscillation throughout the whole time domain. The second primary period was around 9 years, its oscillation amplitude had been gradually increasing from the beginning of 1994, which could have been a great impact in the future. (3) NDVI correlated significantly with the occurrence times of summer extreme high-temperature in East China. The summer vegetation coverage was lower in the east of Jiangsu, while higher in the north of Shandong as well as the southwest and northwest of Jiangxi, when the occurrence times of summer extreme high-temperature in the south and center of East China were above normal. The summer vegetation coverage was higher in the northeast of Shandong, while lower in the east of Jiangsu as well as the south of Fujian and the north of Jiangxi, when the occurrence times of summer extreme high-temperature in the center of Shandong region were below normal.

Key words: Extreme high-temperature, Wavelet, Period, Singular value decomposition, Vegetation

GE Fei-fan, MAO Ke-biao, JIANG Yue-lin, TAN Xue-lan, ZHAO Ying-hui, XIA Lang. Extreme High-temperature in Summer and Its Impacts on Vegetation in East China[J]. Chinese Journal of Agrometeorology, 2017, 38(01): 42-51.

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