浙南春茶早春霜冻的时空分布特征
发布时间：2019-04-21 18:50
【摘要】：利用1971—2015年浙南7县(市、区)早春(2—4月)逐日气温观测资料,根据茶叶早春霜冻的气象灾害指标,采用多尺度趋势方法分别从空间、时间分析浙南茶叶早春霜冻的气候变化特征,并利用Mann-Kendall检验验证浙南茶叶早春霜冻的变化趋势和突变转折。结果表明:浙南茶叶早春霜冻发生次数较高,年均发生天数为16.8天,其中2月发生早春霜冻的可能性最高,且以轻度和重度霜冻为主。早春霜冻的空间分布结构由东南面向西北面递增,青田县发生早春霜冻的可能性最低,缙云县发生的可能性最高。茶叶早春霜冻日数的长期变化趋势表现为显著减少,且极端最低气温上升趋势明显,即浙南茶叶早春出现低温霜冻的可能性减小。浙南茶叶早春霜冻减少发生的突变点在20世纪80—90年代,且在21世纪初减少趋势最为显著。
[Abstract]:Based on the daily observation data of air temperature in early spring (February-April) of 7 counties (cities and districts) in southern Zhejiang from 1971 to 2015, according to the meteorological disaster index of early spring frost of tea, the multi-scale trend method is adopted from space, respectively. The climate change characteristics of early spring frost in southern Zhejiang tea were analyzed in time. Mann-Kendall test was used to verify the change trend and abrupt change of early spring frost in southern Zhejiang tea. The results showed that the occurrence times of early spring frost in southern Zhejiang tea were higher, the average annual occurrence time was 16.8 days, and the possibility of early spring frost occurred in February was the highest, and the main reason was mild and severe frost. The spatial distribution structure of early spring frost increased from southeast to northwest. The possibility of early spring frost was the lowest in Qingtian County and the highest in Jinyun County. The long-term change trend of frost days in early spring of tea showed that the number of frost days decreased significantly, and the extreme minimum temperature increased obviously, that is, the possibility of low temperature frost in early spring of tea in southern Zhejiang decreased. The sudden changes of early spring frost reduction in southern Zhejiang tea occurred in the 1980s and 1990s, and the trend of decrease in early spring frost was the most significant in the beginning of the 21st century.
【作者单位】： 南京大学大气科学学院;浙江省丽水市气象局;浙江省气候中心;
【基金】：公益性行业(气象)科研专项(GYHY201306037) 丽水气候生态创新团队项目(2015-1-2)资助
【分类号】：S571.1;S425
，
本文编号：2462462
[Abstract]:Based on the daily observation data of air temperature in early spring (February-April) of 7 counties (cities and districts) in southern Zhejiang from 1971 to 2015, according to the meteorological disaster index of early spring frost of tea, the multi-scale trend method is adopted from space, respectively. The climate change characteristics of early spring frost in southern Zhejiang tea were analyzed in time. Mann-Kendall test was used to verify the change trend and abrupt change of early spring frost in southern Zhejiang tea. The results showed that the occurrence times of early spring frost in southern Zhejiang tea were higher, the average annual occurrence time was 16.8 days, and the possibility of early spring frost occurred in February was the highest, and the main reason was mild and severe frost. The spatial distribution structure of early spring frost increased from southeast to northwest. The possibility of early spring frost was the lowest in Qingtian County and the highest in Jinyun County. The long-term change trend of frost days in early spring of tea showed that the number of frost days decreased significantly, and the extreme minimum temperature increased obviously, that is, the possibility of low temperature frost in early spring of tea in southern Zhejiang decreased. The sudden changes of early spring frost reduction in southern Zhejiang tea occurred in the 1980s and 1990s, and the trend of decrease in early spring frost was the most significant in the beginning of the 21st century.
【作者单位】： 南京大学大气科学学院;浙江省丽水市气象局;浙江省气候中心;
【基金】：公益性行业(气象)科研专项(GYHY201306037) 丽水气候生态创新团队项目(2015-1-2)资助
【分类号】：S571.1;S425
，
本文编号：2462462
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