Enhanced correlation between ENSO and western North Pacific monsoon during boreal summer around the 1990s

Wu, Minmin; Wang, Lei

doi:10.1080/16742834.2019.1641397

Cited by 19 publications

(12 citation statements)

References 31 publications

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“…It has been reported that cooler (warmer) SST in the tropical central and eastern Pacific can favor less (more) rainfall over the tropical WNP and thus an anticyclonic (cyclonic) anomaly to the northwest (Lau and Nath 2006;Wang et al 2013). These results are also consistent with some recent studies (He and Wu 2018;Wu and Wang 2019), who reported that the tropical WNP precipitation or anticyclonic anomaly is more associated with the simultaneous SST anomalies in the tropical central and eastern Pacific in the recent decade.…”

Section: Possible Mechanismsupporting

confidence: 91%

“…Xu et al (2019) also suggested that the convection location and easterly shear over the tropical WNP result in the weakened and eastward shifted teleconnection after the late 1990s. Furthermore, some studies discussed the role of ENSO evolution in affecting the components of the teleconnection (Yim et al 2008b;He and Wu 2018;Huang et al 2018;Wu and Wang 2019;Huang et al 2020), but these studies mainly focused on the tropical anomalies rather than the tropical-extratropical couplings. In this study, we would show a comprehensive breakdown of the meridional teleconnection in the early 2000s, focusing on the tropical-extratropical connections, and explore the possible role of tropical SSTs in inducing the breakdown of teleconnection.…”

Section: Introductionmentioning

confidence: 99%

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Breakdown of the Summertime Meridional Teleconnection Pattern over the Western North Pacific and East Asia since the Early 2000s

2020

Journal of Climate

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The meridional teleconnection over the western North Pacific and East Asia (WNP–EA) plays a predominant role in affecting the interannual variability of East Asian climate in summer. This study identified a breakdown of the meridional teleconnection since the early 2000s. Before the early 2000s, there are close tropical–extratropical relationships at the view of both circulation and rainfall anomalies. For instance, the westward extension of the western North Pacific subtropical high (WNPSH) is closely associated with the southward shift of the East Asian westerly jet (EAJ), and more rainfall in the tropical WNP closely corresponds to less rainfall in the subtropical WNP–EA. However, after the early 2000s, the tropical–extratropical relationships are absent. Particularly, the tropical WNP precipitation anomalies can induce WNPSH anomalies, but the WNPSH anomalies cannot induce subtropical precipitation in the latter period, due to the absence of EAJ-related extratropical circulation anomalies. Further results indicate that in the latter period, the westward extension of the WNPSH is associated with the decay of central Pacific-like El Niño, and simultaneous summer sea surface temperature (SST) anomalies in the central eastern Pacific favor the northward shift of the EAJ, resulting in the disruption of the WNPSH–EAJ relationship. This evolution of tropical SSTs is sharply different from the decay of canonical El Niño and simultaneous summer tropical Indian Ocean warming, which favor the WNPSH–EAJ correspondence in the former period.

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Section: Possible Mechanismsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Breakdown of the Summertime Meridional Teleconnection Pattern over the Western North Pacific and East Asia since the Early 2000s

2020

Journal of Climate

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“…In contrast, stronger coupling between the JJA Niño3.4 SST and JJA tropical Indian Ocean SST anomalies could be identified during this period (Wang and Yu 2018). The warm JJA western North tropical Indian Ocean SST anomalies could hamper and cancel out the influences of JJA warm Niño3.4 SST anomalies on the WNPSM, resulting in the weakening of the WNPSM-ENSO correlation (Wu and Wang 2019). In contrast, stronger ENSO-Indian Ocean coupling may support an active ISM (e.g., Wang and Yu 2018;Srivastava, Chakraborty, and Nanjundiah 2019), possibly with stronger variations and closer associations with ENSO.…”

Section: Resultsmentioning

confidence: 87%

Contrasting the Indian and western North Pacific summer monsoons in terms of their intensity of interannual variability and biennial relationship with ENSO

Chen

Wang

2020

Atmospheric and Oceanic Science Letters

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The intensity of interannual variability (IIV) of the monsoon and monsoon-ENSO biennial relationship (MEBR) were examined and compared for both the Indian summer monsoon (ISM) and western North Pacific summer monsoon (WNPSM) during 1958-2018. Covariability of the IIV and MEBR were identified for the two monsoons. When the MEBR was strong (weak), the IIV of the monsoon was observed to be large (small). This rule applied to both the ISM and WNPSM. Out-ofphase relationships were found between the ISM and the WNPSM. When the IIV and MEBR of the ISM were strong (weak), those of the WNPSM tended to be weak (strong). During the period with a stronger (weaker) ENSO-Atlantic coupling after (before) the mid-1980s, the IIV and MEBR of the WNPSM (ISM) were observed to be stronger. The increasing influences from the tropical Atlantic sea surface temperature (SST) may trigger the observed seesaw pattern of the ISM and WNPSM in terms of the IIV and MEBR multidecadal variability. The results imply that tropical Atlantic SST may need to be given more attention and consideration when predicting future monsoon variability of the ISM and WNPSM.

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“…However, the correlation analysis between the Niño3 index and TCGF in the WNP during July and August showed a correlation of −0.16, which is statistically insignificant. However, previous studies (Cao et al ., 2018; Liu and Chen, 2018; Zhao and Wang, 2018; Wu and Wang, 2019; Zhao et al ., 2019) have suggested that there are significant decadal changes in the correlation between WNP TCGF/monsoon and ENSO around 1990s (not significant before 1990s, but become significant after 1990s). Thus, a partial correlation analysis was conducted to examine whether the ENSO influenced the high positive correlation between HWD in Korea and TCGF in the WNP during July and August (Table 2).…”

Section: Resultsmentioning

confidence: 99%

The interannual synchronization of the heatwave days in Korea and western North Pacific tropical cyclone genesis frequency

Cha

Choi

Ahn

2022

Intl Journal of Climatology

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This study conducted a correlation analysis between tropical cyclone genesis frequency (TCGF) in the western North Pacific (WNP) and heatwave days (HWD) in Korea during July and August for 1973-2018 and we found a strong positive correlation between them. This implied that the higher the TCGF in the WNP during July and August, the higher the HWD in Korea becomes. To examine the cause of the positive correlation between the TCGF during July and August in the WNP and the HWD in Korea, 15 years with the highest frequency and the lowest frequency out of the 46 years in the TCGF time series were selected and defined as high TCGF years and low TCGF years, respectively. According to the difference in atmospheric circulations between the two groups, in all layers of the troposphere, anomalous anticyclonic and cyclonic circulations were strengthened in the mid-latitude region of East Asia and in the WNP, respectively, which was similar to the Pacific-Japan (PJ) teleconnection pattern. The difference in the vertical meridional circulation averaged over the longitude range where Korea is located showed that anomalous upward and downward flows were strengthened in the WNP and in the latitude where Korea is located, respectively. This implied that the local Hadley circulation was strengthened during high TCGF years. Five hundred hectopascal wave activity flux originated from the North Atlantic, passed through the Scandinavian Peninsula, the North coast of Russia, and East Siberia before reaching Korea and the WNP. This spatial distribution was similar to the Scandinavia teleconnection pattern.

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Enhanced correlation between ENSO and western North Pacific monsoon during boreal summer around the 1990s

Cited by 19 publications

References 31 publications

Breakdown of the Summertime Meridional Teleconnection Pattern over the Western North Pacific and East Asia since the Early 2000s

Breakdown of the Summertime Meridional Teleconnection Pattern over the Western North Pacific and East Asia since the Early 2000s

Contrasting the Indian and western North Pacific summer monsoons in terms of their intensity of interannual variability and biennial relationship with ENSO

The interannual synchronization of the heatwave days in Korea and western North Pacific tropical cyclone genesis frequency

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