Temporal Variations of Climate Seasons and Different Levels of Integrated Temperature in Ankang City from 1960 to 2019
Revealing variation characteristics of temperature indicators such as climate season and integrated temperature(IT)in Ank-ang city under the background of climate warming,provides scientific basis for regional humans to adapt to climate change and adjust agricultural production.Based on the daily average temperature data from Ankang meteorological station during 1960～2019,this paper uses methods such as 5d exponential moving average and linear fitting to explore the temporal variation patterns of the initial day,dura-tion days and temperature,including climate seasonal temperature(CST)or active integrated temperature(AIT)of the climate season and four ITs in Ankang city with the thresholds of ≥5,≥10,≥15,and ≥20 ℃,respectively.The results showed that the average temperature in Ankang increased significantly at a rate of 0.012 ℃·a-1(P＜0.01)from 1960 to 2019,and an abrupt warming change occurred in 1997.The interdecadal variation characteristics of temperature indicators such as the initial day and duration days of climate seasons and four AITs vary.The average CST showed an insignificant and weak upward trend from 1960 to 2019 in Ankang,with the spring CST of 0.012 ℃·a-1 being the largest increase in all CSTs.The beginning date of spring was significantly earlier,and the duration day was significantly increasing;on the contrary,summer,autumn,and winter showed a consistent trend of no significant delay in the beginning date and a continuous shortening of the duration days,with the summer(autumn)season being the most prominent in terms of the degree of delay(shortening).From 1960 to 2019,all four AITs(≥5,≥10,≥15,and ≥20 ℃)showed a of early(delayed)initial(final)days,and an increasing trend in duration days and AITs.Among them,the initial day,duration days,and AIT with ≥ 15 ℃ advanced(increased)the most,and the final day was most significantly delayed with ≥ 10 ℃.In the future,multi cropping and late maturing crops can be achieved in the region,which can effectively enhance food security.As a consequence,the climate seasons and integrated temperature in Ankang have a significant response to global warming phenomena.
average temperatureclimate seasonintegrated temperature(IT)5d exponential moving averageAnkang
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