Relationship between ENSO and northward propagating intraseasonal oscillation in the east Asian summer monsoon system

Yun, Kyung-Sook; Seo, Kyong‐Hwan; Ha, Kyung‐Ja

doi:10.1029/2008jd009901

Cited by 48 publications

(44 citation statements)

References 55 publications

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“…As a result, the remote IOSST warming and local western Pacific SST cooling are key factors in bridging the ENSO into the WNPSH and, in turn, EASM. The summertime NPISO activity is also strongly related to IOSST warming and western Pacific cooling that follows a warm ENSO event (Yun et al, 2008). As evidence of the significant NPISO-ENSO relationship, the summertime low-level height anomalies regressed onto the ENSO phase during November to January (Figure 10(a)) reveal enhanced WNP anticyclonic and northern cyclonic anomalies similar to the NPISO-induced three-cell circulation structure shown in Figure 9.…”

Section: Interannual Relationship Between Npiso and Ensomentioning

confidence: 65%

“…In particular, Yun et al (2008) reported a significant relationship between ENSO and NPISO over East Asia. Because the northward migration of the East Asian monsoonal front is modulated by a 30-60 day ISO (Chen and Chen, 1995;Yun et al, 2009), compared to the total variability in EASM, the ISO is more significantly related to ENSO.…”

Section: Interannual Relationship Between Npiso and Ensomentioning

confidence: 99%

“…The NPISO is identified as the first two leading EOF modes of 30-60 day filtered OLR anomalies in the spatial domain 22.5-45°N, 100-150°E and temporal range from May to October in order to investigate the EASM-ENSO relationship on the intraseasonal timescale. The NPISO activity is calculated from the variance of the principal component time series, the details of which have been described by Yun et al (2008). On the basis of the NCEP-2 data, this relation was reviewed by extending the period of 1979-2004 (26 years) to 1979-2010 (32 years).…”

Section: Interannual Relationship Between Npiso and Ensomentioning

confidence: 99%

See 2 more Smart Citations

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 Relationship Between Npiso and Ensomentioning

confidence: 65%

Section: Interannual Relationship Between Npiso and Ensomentioning

confidence: 99%

Section: Interannual Relationship Between Npiso and Ensomentioning

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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“…The positive SAM-EAM relationship is mainly influenced by a wave propagating over Tropics along the lower-level monsoon westerly (Wang et al 2001, 2013, Hsu and Lin 2007Liu et al 2008;Yun et al 2008Yun et al , 2010Lee et al 2011aLee et al , b, 2013) that preferentially occurs during the decaying phase of the ENSO (Ding et al 2010;Lee et al 2011a, b;Wang et al 2013Wang et al , 2015Chen et al 2016;Ha et al 2017). The tropical teleconnection is called the western North Pacific-North America (WPNA) pattern, including the WPSH as an important factor bridging the SAM and EAM climate (Wang et al 2001;Kosaka et al 2013;Lee et al 2013a, b).…”

Section: Decaying Ensomentioning

confidence: 99%

Linkages between the South and East Asian summer monsoons: a review and revisit

Seo

Lee

et al. 2017

Clim Dyn

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with decaying El Niño and developing Indian Ocean sea surface temperature (SST) warming anomalies; the other is the negative inter-correlation, resulting from developing El Niño and western Pacific SST cooling. The IODM mode also has a delayed impact on the negative connection by modulating Eurasian snow cover. The observed evidence reveals that the recent intensification of the negative relationship is attributable to the strengthening of the zonal SST gradient along the Indian Ocean, western Pacific, and eastern Pacific. Analysis of experiments in the fifth phase of the Coupled Model Intercomparison Project further indicates a possibility for the negative linkage to be further enhanced under anthropogenic global warming with considerable interdecadal modulation in mid and late twentyfirst century.

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“…Sea surface temperature anomaly (SSTA) and local air-sea interaction were suggested to be the main factors in contribution to the interannual variation of the WNPSH [e.g., Yang et al, 2007;Yun et al, 2008]. The WNP, the maritime continent, the northern Indian Ocean (NIO), and the equatorial eastern Pacific where El Niño-Southern Oscillation (ENSO) occurs were the critical regions where the SSTA has notable local or remote effect on the interannual variation of the WNPSH in boreal summer [e.g., Wu et al, 2010;Yun et al, 2013;Wang et al, 2013].…”

Section: Introductionmentioning

confidence: 99%

Enhanced relationship between the tropical Atlantic SST and the summertime western North Pacific subtropical high after the early 1980s

2014

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The western North Pacific subtropical high (WNPSH) in boreal summer shows a remarkable enhancement after the early 1980s. Whereas the sea surface temperature (SST) in the North Indian Ocean (NIO) and the equatorial eastern Pacific had been noted to have remarkable local or remote effects on enhancing the WNPSH, the influence of the Atlantic SST, so far, is hardly explored. This article reports a new finding: enhanced relationship between the tropical Atlantic (TA)-SST and the WNPSH after the early 1980s. Regression study suggests that the warm TA-SST produced a zonally overturning circulation anomaly, with descending over the equatorial central Pacific and ascending over the tropical Atlantic/eastern Pacific. The anomalous descending over the equatorial central Pacific likely induced low-level anticyclonic anomaly to the west and therefore enhanced the WNPSH. One implication of this new finding is for predictability. The well-known "spring predictability barrier" (i.e., the influence of El Niño-Southern Oscillation (ENSO) falls dramatically during boreal spring) does not apply to the TA-SST/WNPSH relationship. The TA-SST shows consistently high correlation starting from boreal spring when the ENSO influence continues declining. The TA-SST extends the predictability of the WNPSH in boreal summer approximately one season earlier to boreal spring.

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Relationship between ENSO and northward propagating intraseasonal oscillation in the east Asian summer monsoon system

Cited by 48 publications

References 55 publications

Variability in the East Asian Monsoon: a review

Variability in the East Asian Monsoon: a review

Linkages between the South and East Asian summer monsoons: a review and revisit

Enhanced relationship between the tropical Atlantic SST and the summertime western North Pacific subtropical high after the early 1980s

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