A sudden change in summer rainfall characteristics in Korea during the late 1970s

International Journal of Climatology - Tập 23 Số 1 - Trang 117-128 - 2003
Chin Siong Ho1, June‐Yi Lee1, Myoung‐Hwan Ahn2, Hee‐Sang Lee1
1School of Earth and Environmental Sciences, Seoul National University, Seoul 151–742, South Korea
2Meteorological Research Institute, Korea Meteorological Administration, Seoul 156–720, South Korea

Tóm tắt

AbstractWe have examined long‐term climate change in Korea by studying daily rainfall data over a period of 48 years (1954–2001). The results show that there is a more frequent heavy rainfall anomaly larger than 100 mm per 3 months in recent years. For further investigation, we divide the whole period into two 24 year intervals, 1954–77 and 1978–2001. Two well‐defined rainfall peaks occur during summertime in both intervals. During the earlier interval, primary and secondary rainfall peaks are found in early July and early September, respectively. In the later interval, on the other hand, the secondary peak is found in mid–late August, mainly attributed to enhanced heavy rainfall (≥30 mm day−1) events. Although a similar shift occurs in the primary peak, it is much smaller. Thus, the relatively dry spell between the two peaks becomes shorter in the later interval compared with the earlier one.The domain‐mean geopotential height at 700 hPa (Φ700) over mid‐latitude Asia (30–50° N, 60–120° E) for the summer also experienced a sudden increase in the mid 1970s. A comparison of the spatial distribution of Φ700 between the two intervals shows large positive differences over the central‐eastern Asian continent in the later interval. In contrast to the positive anomaly of Φ700 in the later interval, there is a decreasing trend in surface temperature. The increased Φ700 introduces a stronger northerly wind over East Asia and possibly produces a moisture convergence, enhanced convective activity, and heavy rainfall over the region, in particular over Korea and central China. Copyright © 2003 Royal Meteorological Society.

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Tài liệu tham khảo

10.2151/jmsj1965.70.1B_397

10.1029/2001GL014523

Ho CH, 1988, The variability of precipitation in Korea, Journal of the Korean Meteorological Society, 24, 38

Hwang JD, 2000, Characteristics of circulation pattern over East Asia associated with heavy rainfall events in Korea during the summer 1999, Journal of the Korean Meteorological Society, 36, 573

10.1029/2000GL011358

10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2

10.1175/1520-0493(1999)127<0322:PMOCSA>2.0.CO;2

10.1175/1520-0493(1985)113<1590:SMER>2.0.CO;2

10.1175/1520-0493(1988)116<0018:SAICOS>2.0.CO;2

10.1175/1520-0442(2000)013<2461:DABFCO>2.0.CO;2

10.1175/1520-0442(2002)015<3630:TASEOT>2.0.CO;2

10.2151/jmsj1965.74.4_425

10.1002/(SICI)1097-0088(199808)18:10<1141::AID-JOC286>3.0.CO;2-P

10.1175/1520-0442(1990)003<0769:PFOSRI>2.0.CO;2

10.1175/1520-0442(1996)009<2173:TIODIT>2.0.CO;2

10.2151/jmsj1965.72.6_937

Yun WT, 2001, Analysis of the Korean heavy rainfall in summer 1998, Journal of the Korean Meteorological Society, 37, 181

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Thông tin xuất bản

International Journal of Climatology

Tập 23 Số 1

117-128

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