Interdecadal Variation of Haze Days over China with Atmospheric Causes in Recent 50 Years

Pan Wei; Zuo Zhiyan; Xiao Dong; Zhang Renhe

doi:10.11898/1001-7313.20170301

Vol.28, NO.3, 2017

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Article Navigation > Journal of Applied Meteorological Science > 2017 > 28(3): 257-269

Pan Wei, Zuo Zhiyan, Xiao Dong, et al. Interdecadal variation of haze days over China with atmospheric causes in recent 50 years. J Appl Meteor Sci, 2017, 28(3): 257-269. DOI: 10.11898/1001-7313.20170301.

Citation:

Pan Wei, Zuo Zhiyan, Xiao Dong, et al. Interdecadal variation of haze days over China with atmospheric causes in recent 50 years. J Appl Meteor Sci, 2017, 28(3): 257-269. DOI: 10.11898/1001-7313.20170301.

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Interdecadal Variation of Haze Days over China with Atmospheric Causes in Recent 50 Years

DOI: 10.11898/1001-7313.20170301

State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2016-12-01
Rev Recd Date: 2017-03-09
Publish Date: 2017-05-31

Abstract

Abstract

Characteristics of interdecadal variations of haze days over China and plausible meteorological causes during 1961 to 2013 are analyzed, using observations from 745 meteorological stations in China. Results show that most haze weather occurs over the east part of China from South China to North China where haze days exhibit an increasing trend especially in economically developed areas, such as North China, the Huanghuai and Jianghuai Plains. Haze days are fewer in large parts of Northeastern China and Western China, and haze days show decreasing tendency in these regions. Generally, haze days are more frequent in autumn and winter than those in spring and summer. Also, autumn and winter are seasons that variation of haze days is most significant. Haze days occur more frequently in January and December than other months. The first mode of EOF reflects a monotonically increasing trend in the east part of China. The second mode shows that the region from South China to the Huaihe River and the region from the Huaihe River to North China present opposite variation tendency of phase. Focusing on regions from South China to the Huaihe River and from the Huaihe River to North China, haze days show an increasing trend year by year over the region from South China to the Huaihe River in autumn and winter before 2000, and then the trend is smoother. In the region from the Huaihe River to North China, however, haze days change gently in recent 30 years in autumn and winter. The variation of haze days relate to surface wind speed and relative humidity. Haze days show a significant negative relationship with surface wind speed before 1990s. Haze days may be influenced by variations of east wind in the region from South China to the Huaihe River in autumn, while northeast wind in the winter. For region from the Huaihe River to North China, haze days is concerned with south wind in autumn, while haze days have nothing to do with wind in winter. The relativity between haze days and surface wind speed weakens, but haze days have significant relationship with relative humidity after 1990s. Haze days experience an increasing tendency because of the reduced surface wind before 1990s and the decrease of relative humidity after 1990s over the region from South China to the Huaihe River in autumn and winter. In comparison, haze days show moderate variations in the region from the Huaihe River to North China, which are probably related to the moderate variability in surface speed and relative humidity in autumn and winter.
- haze days;
- relative humidity;
- surface wind

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References(34)

Figures and Tables

图 1 1961—2013年中国霾日数的气候平均态 (填色) 及标准差 (等值线，单位：d)

Fig. 1 The distribution of annually mean haze days (the shaded) and standard deviations (contour, unit:d) in China during 1961-2013

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图 2 1961—2013年中国霾日数变化趋势 (达到0.05显著性水平) 的空间分布 (填色)

Fig. 2 Trend of annual haze days passing the test of 0.05 level in China during 1961-2013(the shaded)

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图 3 1961—2013年中国年霾日数秋冬两季EOF分析

(a) 秋季第1模态空间分布，(b) 秋季第1模态对应的时间系数，(c) 秋季第2模态空间分布，(d) 秋季第2模态对应的时间系数，(e) 冬季第1模态空间分布，(f) 冬季第1模态对应的时间系数，(g) 冬季第2模态空间分布，(h) 冬季第2模态对应的时间系数

Fig. 3 The EOF analysis of haze days in autumn and winter during 1961-2013

(a) the spatial distribution of the first characteristic vector in autumn, (b) the temporal variation of the first characteristic vector in autumn, (c) the spatial distribution of the second characteristic vector in autumn, (d) the temporal variation of the second characteristic vector in autumn, (e) the spatial distribution of the first characteristic vector in winter, (f) the temporal variation of the first characteristic vector in winter, (g) the spatial distribution of the second characteristic vector in winter, (h) the temporal variation of the second characteristic vector in winter

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图 4 1961—2013年中国南部及北部秋冬两季标准化霾日数逐年变化

(a) 南部霾日数, (b) 北部霾日数

Fig. 4 Time series of normalized haze days over southern and northern China in autumn and winter during 1961-2013

(a) haze days in southern China, (b) haze days in northern China

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图 5 1961—2013年秋冬两季气候平均态近地面风场

(a) 秋季风场, (b) 冬季风场

Fig. 5 Climatological surface horizontal wind in autumn and winter during 1961-2013

(a) wind in autumn, (b) wind in winter

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图 6 1961—2013年中国南部及北部秋冬两季霾日数与近地面风速的21年滑动相关系数

Fig. 6 21-year sliding correlation coefficients between haze days and surface wind speed over southern and northern China in autumn and winter during 1961-2013

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图 7 1961—2013年中国南部及北部秋冬两季近地面风速的时间演变曲线

Fig. 7 Time series of surface wind speed over southern and northern China in autumn and winter during 1961-2013

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图 8 1961—2013年中国南部及北部秋冬两季比湿、饱和比湿及相对湿度的时间演变曲线

Fig. 8 Time series of specific humidity, saturation specific humidity and relative humidity over southern and northern China in autumn and winter during 1961-2013

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图 9 1961—2013年南部及北部秋冬两季相对湿度与霾日数的21年滑动相关系数

Fig. 9 21-year sliding correlation coefficients between haze days and relative humidity over southern and northern China in autumn and winter during 1961-2013

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