[1]TIAN Baoxing,GONG Lijuan,YANG Fan,et al.Wavelet Analysis on Lowest Temperature Index in Spring in Heilongjiang Province[J].Research of Soil and Water Conservation,2017,24(01):342-345,350.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 01
Page number:
342-345,350
Column:
Public date:
2017-02-28
- Title:
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Wavelet Analysis on Lowest Temperature Index in Spring in Heilongjiang Province
- Author(s):
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TIAN Baoxing1, GONG Lijuan1, YANG Fan2, LI Haoran3, JI Shengtai1, YU Min1
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1. Heilongjiang Province Institute of Meteorological Science, Harbin 150030, China;
2. Heilongjiang Meteorological Bureau In-house Service Centre, Harbin 150030, China;
3. College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
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- Keywords:
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low temperature; spring; wavelet analysis; Heilongjiang Province
- CLC:
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P49
- DOI:
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- Abstract:
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Based on the owest temperature index model and the lowest temperature data of Heilongjiang Province in spring from 1971 to 2014, trend prediction and Morlet wavelet were used to examine the change trend and periodic change of multiple time scale to the lowest temperature index of spring in Heilongjiang Province during the past 44 years. The results showed that it was a downtrend to the lowest temperature index of spring in Heilongjiang Province. The lowest temperature index of spring had significantly decreased as the temperature had increased obviously since 1980s. However, the lowest temperature index of spring significantly increased with the rise of extreme temperature in 2010s. There were 3 periodic changes of scales in the lowest temperature of spring, which were 17~29 years, 7~16 years, and 3~6 years. The scales of 17~29 years and 7~16 years were very stable in the whole duration. The scale of 4~14 years was more stable in the later of 1990s. The scale of 10~15 years was the most obvious. The scale of 11~15 years was the strongest energy and most significantly cycle. The energy of 10~18 years was almost throughout the whole duration. The scale of 19~26 years occupied in the most of whole duration. The main cycle of the lowest temperature index of spring had 20 years, 12 years, 6 years, 2 years, the scale of 12 years was the first main cycle, and the average cycle was about 8.5 years.