基于ETCCDI指数的1991—2021年辽宁省极端降水和气温特征分析

doi:10.3969/j.issn.1673-503X.2024.04.009

Abstract

Abstract:

Daily temperature and precipitation data from 60 stations in Liaoning province from 1991 to 2021 were used to calculate 26 extreme climate indices defined by the Expert Team on Climate Change Detection and Indices (ETCCDI). The changes in extreme climate events over the past 30 years and the characteristics of extreme precipitation and temperature in 2021 in Liaoning province were analyzed. The results showed that the average intensity of single extreme cold (warm) events in Liaoning province has increased, but their frequency has decreased, and the frequency of persistent extreme events has also decreased. The number of low-temperature days has decreased. The length of the growing season has increased, and the indices of warm nights and summer days have increased. Extreme precipitation amounts showed significant decadal variations from decrease to increase. In 2021, both extreme cold and warm events in Liaoning province were colder than normal, with extreme cold events being consistently colder across the province, while warm events were colder in western Liaoning province and warmer in the east. The growing season in 2021 was longer than in previous years. Total precipitation and extreme precipitation events were both above average, with prolonged wet periods and shortened dry spells.

Key words: Climate change, Cold events, Warm events

CLC Number:

P468.0

Wanying ZHANG,Xiubo SUN,Yi LIN,Jian SONG,Bing LI,Mengmeng ZHANG,Jianing LI,Jiaxin LV. Analysis of extreme precipitation and temperature characteristics in Liaoning province from 1991 to 2021 based on ETCCDI indices[J]. Journal of Meteorology and Environment, 2024, 40(4): 72-79.

Figures/Tables 8

Table 1

Twenty-six extreme precipitation and temperature indices defined by the World Meteorological Organization and the World Climate Research Programme"

序号	指数	指数名称	定义	单位
1	TNn	年最小日最低气温	年内日最低气温的最小值	℃
2	TXn	年最小日最高气温	年内日最低气温的最大值	℃
3	TNx	年最大日最低气温	年内日最高气温的最小值	℃
4	TXx	年最大日最高气温	年内日最高气温的最大值	℃
5	ID	冰冻日数	年内日最高气温＜0 ℃的日数	d
6	FD	霜冻日数	年内日最低气温＜0 ℃的日数	d
7	TR	热夜日数	年内日最低气温＞20 ℃的日数	d
8	SU	夏日日数	年内日最高气温＞25 ℃的日数	d
9	TN90p	暖夜	年内最低气温＞90%分位值的天数百分比	%
10	TX90p	暖昼	年内最高气温＞90%分位值的天数百分比	%
11	TX10p	冷昼	年内最高气温＜10%分位值的天数百分比	%
12	TN10p	冷夜	年内最低气温＜10%分位值的天数百分比	%
13	WSDI	持续暖日日数	年内连续6 d最高气温>90%分位值日数	d
14	CSDI	持续冷日日数	年内连续6 d最低气温 < 10%分位值日数	d
15	GSL	生长期长度	从1月1日开始，连续6 d平均气温>5 ℃日期至7月1日以后连续6 d日平均气温 < 5 ℃日期的日数(北半球)	d
16	DTR	气温日较差	年平均日最高气温和最低气温之差	℃
17	R95P	强降水量	年内日降水量>95% 分位值的年累积降水量	mm
18	R99P	极端强降水总量	年内日降水量>99% 分位值的年累积降水量	mm
19	Rx1day	最大1 d降水量	年最大日降水量	mm
20	Rx5day	最大5 d降水量	年最大连续5 d的降水量	mm
21	R10mm	大雨日数	年日降水量≥10 mm的总日数	d
22	R20mm	极端大雨日数	年日降水量≥20 mm的总日数	d
23	CDD	持续干燥指数	年内日降水量 < 1 mm的最长连续日数	d
24	CWD	持续湿润指数	年内日降水量≥1 mm的最大持续日数	d
25	PRCPTOT	年降水总量	年内日降水量>1 mm的年累积降水量	mm
26	SDII	日降水强度	年内降水量≥1 mm的总量与日数之比	mm

Table 1

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Analysis of extreme precipitation and temperature characteristics in Liaoning province from 1991 to 2021 based on ETCCDI indices

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