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The Identification and Changing Characteristics of Regional Low Temperature Extreme Events
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摘要: 区域性极端低温事件的客观识别方法主要包括4个部分：极端低温阈值的确定、极端低温事件空间区域的识别、空间区域的连续性过程提取和指标体系，结合个例分析验证了该方法在实际低温事件检测中的有效性。从空间分布和时间变化趋势等角度分析了近50年区域性极端低温事件的变化特征：区域性极端低温事件的发生频次较高的纬度带主要位于32°N和42°N附近，区域性极端低温事件的发生频次、强度和最大覆盖面积等存在总体减弱的趋势，在20世纪80年代后期存在显著的转折，90年代后期以来变化逐渐趋于平缓。此外，对各种单一指标与我国冷冻害造成的经济损失和受灾人口之间的相关分析，构建了体现区域性极端低温事件多方面影响的综合指标。Abstract: When an extreme low temperature event occurs, it generally impacts a certain area and lasts for some time, which means that it is a regional extreme event. How to identify a regional extreme low temperature is the basis for studies in this area. An objective identification technique for regional low temperature extreme events (OITRLTE) is developed. This technique consists of four parts: Defining the threshold value of extreme low temperature for single station; identifying abnormality belts; distinguishing temporal continuous process of the event; an integrated index system. The index is specially developed based on the features of regional events, which includes 5 single indices: Extreme intensity, accumulated intensity, accumulated area, maximum impacted area and duration, as well as an integrated index. Case studies show that OITREE is skillful in identifying regional low temperature extreme events (RLTEs). It can objectively and automatically capture daily impacted areas of a regional event for its duration, and reasonably putting them in a "string" to shape an entire regional event. Then based on the winter daily minimum temperature from 1960 to 2009, spatial distribution and temporal changes of RLTEs is also investigated. Results show that probability distribution of lowest temperature and latitude of geometrical center of RLTEs both obey the two-peak distribution, and the center of RLTEs mainly locates at two belts of 32°N and 42°N. The annual accumulative value of the frequency, intensity and max covering area of RLTEs is decreasing, and during the end of 1980s this trend changes and the trend becomes stationary after 1990s. These characteristics might be caused by the RLTEs with long duration and wide space range that accounted for top 10% of all events. Considering the good correlation between RLTE indexes, economic loss and the number of stricken people on cold disasters, an integration index is defined based on RLTE indexes. The weighted coefficients of the first-grade integrated index are defined based on the correlation between the yearly cumulative value of first-grade index, the corresponding yearly index of economic losses and the number of stricken people on cold disasters. So, in this way the weight coefficients denote the correlation between regional low temperature extreme events and corresponding disaster losses to some extent.
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图 1 临时可能事件和低温带重合信息及整合过程图示
Fig. 1 Information combination of temporal possible events and low temperature belts
图 2 2008年1月21日开始的西北—华南型区域性极端低温事件站点分布
(黑点表示达到低温极端阈值的站点；彩色填充区表示逐日累积强度值)
Fig. 2 Daily station distribution of regional extreme low temperature event located at Northwest—South China from 21 Jan 2008
(black point denotes the station of regional extreme low temperature events; shaded area denotes the daily difference between minimum temperature and threshold value of extreme low temperature, Ld)
图 3 2008年1月21日—2月16日西北—华南型区域性极端低温事件指标逐日演变
(红线为五点平滑曲线)
Fig. 3 Daily change of index of regional low temperature extreme events located at Nouthwest—South China from 21 Jan 2008 to 16 Feb 2008
(red line denotes 5-point moving smooth)
图 4 2008年和2011年两次区域性极端低温事件空间分布
(a)2008年1月21日开始的事件, (b)2010年12月30日开始的事件
Fig. 4 Station distribution of regional low temperature extreme events which started from 21 Jan 2008(a) and 30 Dec 2010(b), respectively (black point denotes the station of regional extreme low temperature events, and shaded area denotes the process accumulative anomalies between the minimum temperature and the threshold value of extreme low temperature, L)
图 5 历年区域性极端低温事件的不同指标的出现频次
(a) 极端强度, (b) 中心位置, (c) 最大覆盖面积，(d) 持续天数
Fig. 5 Probability distribution of main indexes of regional low temperature extreme events
(a)Q, (b) location of geometrical center, (c)Amax, (d)N
图 6 1960—2008年区域性极端低温事件各项指标逐年累积值的距平图
(a) 极端强度, (b) 累积强度, (c) 最大覆盖面积, (d) 累积面积, (e) 持续天数
Fig. 6 Annual change of main indexes of regional low temperature extreme events during 1960—2008 (a)Q, (b)L, (c)Amax, (d)A, (e)N
表 1 两次区域性极端低温事件信
Table 1 Information of two regional low temperature extreme events
实况 开始时间 结束时间 极端
强度/℃累积
强度/℃累积覆盖
面积/(104km2)持续
天数/d中心位置 2008年1月21日开始的西北—
华南型区域性极端低温事件2008-01-21 2008-02-15 -39.1 -127524.0 7929.8 26 32.98°N,
106.02°E2010年12月31日开始的
全国型区域性极端低温事件2010-12-30 2011-02-02 -49.6 -120463.0 9454.8 35 35.38°N,
109.30°E
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表 2 1989—2004年各项指标年累积值与冷冻害经济损失和受灾人数的相关系数及权重系数
Table 2 Correlation coefficients between annual accumulative values of different regional low temperature extreme event index and economic loss with the number of stricken people on cold disasters
统计量 Q L A N Amax 经济损失的相关系数 -0.57 -0.54 0.50 0.61 0.65 受灾人数的相关系数 -0.47 -0.35 0.25 0.58 0.43 平均相关系数 -0.52 -0.45 0.38 0.60 0.54 权重系数 -0.21 -0.18 0.15 0.24 0.22 综合指数的相关系数 -0.69 -0.82 0.85 0.91 0.81
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