FEATURES OF SUMMER MONSOON LFO AND LFR OVER BEIJING-TIANJING-HEBEI AREA IN 1998

Xu Guoqiang; Zang Jiansheng; Zhou Weican

Vol.12, NO.3, 2001

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2001 > 12(3): 297-306

Xu Guoqiang, Zang Jiansheng, Zhou Weican. Features of summer monsoon LFO and LFR over Beijing-Tianjing-Hebei area in 1998. J Appl Meteor Sci, 2001, 12(3): 297-306.

Citation:

Xu Guoqiang, Zang Jiansheng, Zhou Weican. Features of summer monsoon LFO and LFR over Beijing-Tianjing-Hebei area in 1998. J Appl Meteor Sci, 2001, 12(3): 297-306.

Xu Guoqiang, Zang Jiansheng, Zhou Weican. Features of summer monsoon LFO and LFR over Beijing-Tianjing-Hebei area in 1998. J Appl Meteor Sci, 2001, 12(3): 297-306.

Citation:

Xu Guoqiang, Zang Jiansheng, Zhou Weican. Features of summer monsoon LFO and LFR over Beijing-Tianjing-Hebei area in 1998. J Appl Meteor Sci, 2001, 12(3): 297-306.

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FEATURES OF SUMMER MONSOON LFO AND LFR OVER BEIJING-TIANJING-HEBEI AREA IN 1998

1.
Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Meteorological Bureau of Hebei Province, Shijiazhuang 050021
3.
Nanjing Institute of Meteorology, Nanjing 210044

Received Date: 1999-12-06
Rev Recd Date: 2000-08-07
Publish Date: 2001-08-31

Abstract

Abstract

In the context of NCEP/NCAR reanalysis daily data in 1998, the features of summer monsoon LFO (Low-Frequency Oscillation) and LFR (Low-Frequency Rainfall) over the Beijing-Tianjing-Hebie area in 1998 are studied. Results show that there is a 15-35 d oscillation cycle in summer monsoon in the target region. The LFR is weaker in May and June than in July and August. The migration direction of LFR is more likely the same as the low frequency (LF) divergence at the 200 hPa level. Vapor over the target region mainly comes from the south and west sides of the research area. The variation of LF vapor transportation from south wind can be useful for forecasting the occurence and development of LFR.
- LFO;
- LFR;
- LF divergence;
- Migration;
- Vapor

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References(9)

Figures and Tables

图 1 1998年5~8月北京 (a) 和石家庄 (b) 日平均降水序列

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图 2 1998年5~8月京、津、冀区域850 hPa纬向风 (a) 和降水 (b) Morlet小波分析

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图 3 1998年5~8月115°E低频降水时间-纬度剖面图 (单位:mm/d)

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图 4 1998年5~8月38°N低频降水经度-时间剖面图 (单位:mm/d)

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图 5 1998年5~8月200 hPa低频散度沿115°E时间-纬度剖面图 (单位:10^-6/s)

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图 6 1998年5~8月200 hPa低频散度沿38°N的经度-时间剖面图 (单位:10^-6/s)

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图 7 1998年5~8月 (38°N, 115°E) 低频散度的时间-高度剖面图 (单位:10^-6/s)

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图 8 京津冀 (36.5°~42°N, 113°~118°E) 各边界水汽输送值 (正值表示流入, 负值表示流出)

(a) 南边界 (b) 北边界 (c) 西边界 (d) 东边界

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图 9 1998年5~8月38°N低频水汽输送经度-时间剖面图 (单位:kg·m^-1·s^-1)

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References

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