Climatic change and interannual fluctuations in the long-term record of monthly precipitation for Seoul

Ha, Kyung‐Ja; Ha, Eunho

doi:10.1002/joc.1272

Cited by 23 publications

(24 citation statements)

References 9 publications

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“…Since areaaveraged precipitation was used, the variances in precipitation were smaller than those at the synoptic station of Seoul. However, as shown in Ha and Ha (2006), the variance in the annual standard deviations representing the annual structure is larger than that in the annual means for all four periods, indicating the importance of the annual structure in year-to-year variability. The anomalous components of annual structure are largest during the period 1931-1960.…”

Section: Interannual and Interdecadal Variabilitymentioning

confidence: 80%

“…The CRI significantly correlates with the indices in terms of SLP, 500 hPa geopotential height, 200 and 850 hPa wind (Ha et al, 2005). Ha and Ha (2006) reported that, compared to the annual mean, the annual structure of the EASM has greater influence on interannual variability and climate change. The total variance in the rainfall over Korea from 1901 to 2002 was investigated and the variance in the annual means and that in the annual standard deviations for the total period compared for the three separate periods ( Table 1).…”

Section: Interannual and Interdecadal Variabilitymentioning

confidence: 93%

“…Many previous studies indicated that the EASM exhibits significant interdecadal variability (Zeng et al, 2007;Ding et al, 2008;Zhou and Huang, 2009). In particular, an increase in August rainfall and change in seasonal structure of Korean rainfall were reported Ha and Ha, 2006;Wang et al, 2007;Ha et al, 2009;Lee et al, 2010). Figure 3 shows the climatological annual cycle of Korean rainfall for the periods 1954periods -1975periods (hereafter referred to as PI) and 1976periods -2010 (hereafter referred to as PII) determined by KMAR data.…”

Section: Interannual and Interdecadal Variabilitymentioning

confidence: 99%

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Variability in the East Asian Monsoon: a review

Heo

Lee

et al. 2012

Meteorological Applications

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146

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ABSTRACT:This study presents reviews of recent research on the structure and the multiscale variability in the East Asian monsoon. The boreal summer and winter seasons in the East Asian monsoon region exhibit significant intraseasonal, interannual and interdecadal variabilities. The interannual intensity of the East Asian summer monsoon (EASM) is mainly associated with the position of the centre of the Bonin High, which may be distinguished from the North Pacific anticyclone. The frequencies of heavy rainfall events and associated rainfall amounts increase, and extreme heavy rainfall is higher in August than in July, due to changes that occurred in the August rainfall-El Niño-Southern Oscillation (ENSO) relationship around the mid-1970s. This intraseasonal variability in EASM plays a more important role in the explanations of the interannual variability and climate change than does the annual mean. The interannual variability in the East Asian winter monsoon (EAWM) depends on the behaviour of the Siberian High (SH), Aleutian Low and the subtropical westerly jet stream. An EAWM index that takes into account the meridional shear of a 300 hPa zonal wind is a good indicator to represent the intensity of the EAWM. The Arctic Oscillation has a close relationship with the EAWM intensity on the decadal time scale. Distinct sub-seasonal variability is characterized with northward propagation and is observed in the interdecadal change in the monsoonal intraseasonal oscillation (ISO)-ENSO relationship. The preceding winter ENSO influenced the early summer northward propagating ISO (NPISO) activity before the late 1970s, whereas a strong NPISO-ENSO relationship appeared during the later summer after the late 1970s. The NPISO-ENSO relationship is robust owing to a tropical atmospheric bridge process involving the Walker Circulation and Rossby Wave propagation.

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Section: Interannual and Interdecadal Variabilitymentioning

confidence: 80%

Section: Interannual and Interdecadal Variabilitymentioning

confidence: 93%

Section: Interannual and Interdecadal Variabilitymentioning

confidence: 99%

See 1 more Smart Citation

Variability in the East Asian Monsoon: a review

Heo

Lee

et al. 2012

Meteorological Applications

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146

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“…Several studies have used this station data set to represent the Korean rainfall and to study its variability. For example, using KMAR, Cha et al [2007] revealed that long‐term changes and extreme events in rainfall occurred in summer during the period of 1954–2004, and Ha and Ha [2006] examined climatic changes using the long‐term rainfall data for Seoul. Kripalani et al [2002] investigated the statistical relationship between winter‐to‐spring snow depth over Russia and summer rainfall over South Korea using KMAR.…”

Section: Data and Analysis Methodsmentioning

confidence: 99%

Shift of peak in summer monsoon rainfall over Korea and its association with El Niño–Southern Oscillation

Lee¹,

Vinayachandran²,

Ha³

et al. 2010

J. Geophys. Res.

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The annual cycle of rainfall over the Korean Peninsula is marked by two peaks: one during July and the other during August. Since the mid‐1970s, the maximum rainfall over the Korean Peninsula has shifted from July to August. This shift in rainfall peak was caused by a significant increase of August rainfall after the mid‐1970s. The basic reason for this shift has been traced to a change in teleconnection between El Niño–Southern Oscillation (ENSO) and August rainfall. The relationship between August rainfall over Korea and ENSO changed from 1954–1975 (PI) to 1976–2002 (PII). The variability of August rainfall was significantly associated with sea surface temperature (SST) variation over the eastern equatorial Pacific during PI, but this relationship is absent during the PII period. In El Niño years during PI, low‐level westerly and southerly wind anomalies are dominant around the East China Sea, which relates to strong August rainfall. In La Niña years during PI, easterly and northerly wind anomalies are dominant. During the PII period, however, westerly and southerly wind anomalies around the East China Sea were responsible for the high August rainfall over the East Asian region, even though La Niña SST conditions were in effect over the eastern Pacific.

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“…The varying time of temporal series is a place where from then on, another statistical distribution prevails over the data (Ha and Ha, 2006). The point of confluence of the two diagrams of u and u 0 indicates a substantial point of variation and the existence of the trend.…”

Section: Trend Detectionmentioning

confidence: 99%

Hydrochemical evaluation of river water quality—a case study: Horroud River

Falah

Haghizadeh

2017

Appl Water Sci

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Surface waters, especially rivers are the most important sources of water supply for drinking and agricultural purposes. Water with desirable quality is necessary for human life. Therefore, knowledge of water quality and its temporal changes is of particular importance in sustainable management of water resources. In this study, available data during 20 years from two hydrometry stations located in the way of Horroud River in Lorestan province were used and analyzed using Aq.QA software. Piper, Schoeller, Stiff, and Wilcox diagram were drawn and Mann-Kendal test was used for determining data trend. According to Wilcox diagram, water of this river in both stations is placed in c 2 s 1 class which is good for agricultural purposes, and according to Schoeller diagram, there is no restrict for drinking purposes. Results of Man-Kendal test show increasing trend for colorine, EC, TDS while decreasing trend for potassium in Kakareza station. On the other hand in Dehnu station, positive trend was seen in calcium and colorine while negative trend for sulfate and potassium. For other variables, no specific trend was found.

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Climatic change and interannual fluctuations in the long-term record of monthly precipitation for Seoul

Abstract: We examine the characteristic climatic changes recorded in the long-term precipitation data for Seoul, Korea. Since precipitation data for Seoul has been accumulated for over 230 years, it is very useful in studying climatic changes in the monsoon region.

Cited by 23 publications

References 9 publications

Variability in the East Asian Monsoon: a review

Variability in the East Asian Monsoon: a review

Shift of peak in summer monsoon rainfall over Korea and its association with El Niño–Southern Oscillation

Hydrochemical evaluation of river water quality—a case study: Horroud River

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