Seasonal change in anomalous WNPSH associated with the strong East Asian summer monsoon

Lee, Eun-Jeong; Yeh, Sang‐Wook; Jhun, Jong-Ghap; Moon, Byung-Kwon

doi:10.1029/2006gl027474

Cited by 47 publications

(28 citation statements)

References 11 publications

(10 reference statements)

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“…Notice that the suppressed convection anomaly over the Philippine Sea is strongest in Figure 8a. This convection anomaly over the Philippine Sea has been attributed to a weakened Walker circulation due to the downward motion in the western Pacific [ Lee et al , 2006]. The reversed Walker circulation (that is, the upward motion in the Indian Ocean and downward motion in the WNP) is also seen in the regressed vertical velocity against the July–August NPISO activity (not shown).…”

Section: Relationship Between the Npiso Activity And Ensosupporting

confidence: 92%

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

Yun

Seo

2008

J. Geophys. Res.

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[1] Observational studies are presented on the relationship between El Niño-Southern Oscillation (ENSO) and the northward propagating intraseasonal oscillation (NPISO) in the east Asian summer monsoon (EASM) system. The summer NPISO activity shows a significant correlation with the preceding winter extreme phase of ENSO cycles. A higher correlation appears during late summer, which is consistent with frequent heavy rainfall events at that time as revealed in some previous case studies. The westward expansion of broad anticyclonic circulation over the western North Pacific and the smaller cyclonic circulation around Korea and Japan are found to be associated with the NPISO activity. ENSO affects the late summer NPISO activity through an atmospheric bridge and wave propagation; the springtime Indian Ocean sea surface temperature warming induced by ENSO through the Walker circulation leads to the downward motion and suppressed convection over the Philippine Sea, and this generates the forced Rossby wave train, forming the above south-to-north low-level circulation anomalies.

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Section: Relationship Between the Npiso Activity And Ensosupporting

confidence: 92%

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

Yun

Seo

2008

J. Geophys. Res.

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“…3f. This indicates that the ENSO is one of the major contributors to enhancd the rainfall over East Asia during JJA, as suggested in previous studies (Huang and Wu 1989;Webster and Yang 1992;Lau et al 2000;Wang et al 2000;Lau and Weng 2002;Lee et al 2005).…”

Section: B Sst and Precipitation Patternssupporting

confidence: 53%

“…1a) is slightly oriented to the southwest and northeast. Such structure is associated with the rainfall variability over northeast Asia along the zone variously called the mei-yu (Chinese), the baiu (Japanese), and the Changma (Korean) (Lee et al 2005). These major rainbands stretch over thousands of kilometers and affect the regional climate.…”

Section: A Two Types Of Strong Neasmmentioning

confidence: 99%

“…Following an El Niñ o event, a basinwide warming takes place over the tropical Indian Ocean, peaking in late winter and early spring (Klein et al 1999). Such warming usually persists through the following JJA, thus influencing the Asian summer monsoon (Lee et al 2006). Using both observations and model experiments, Yang et al (2007) pointed out that the Indian Ocean warming SST strengthens a South Asian high accompanied by a weakened monsoon over the South China Sea and the Philippine Sea, resulting in a strong East Asian summer monsoon.…”

Section: Introductionmentioning

confidence: 97%

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Two Types of Strong Northeast Asian Summer Monsoon

2009

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The characteristics of a strong northeast Asian summer monsoon (NEASM) with and without (A and B type, respectively) a basinwide warming in the Indian Ocean during the preceding winter are examined for the period of 1979-2006. In the case of the A type, strong El Niñ o-like sea surface temperature (SST) decays very rapidly from the preceding winter (December-February) to the following summer (June-August), which may be due to a feedback process of the warm Indian Ocean. In addition, the A-type strong NEASM is more associated with a weak western North Pacific summer monsoon than the B-type strong NEASM. On the other hand, for the B type an El Niñ o-like SST during the preceding winter is a persistent influence into the following summer. A striking difference can be found in the atmospheric teleconnection pattern from the tropics to the midlatitudes over the Indo-Pacific region, that is, the Pacific-Japan-like pattern versus a pronounced Rossby wave train pattern. This may result from the difference in location of the maximum center of rainfall anomalies over the tropical northwestern Pacific between the two types of strong NEASM. The authors argue that Indian Ocean basin warming plays a role in modifying the convective system over the subtropical western Pacific, resulting in changes in atmospheric teleconnections between the two types of strong NEASM. The weak NEASM, in which the anomalous rainfall pattern resembles that of the A-type strong NEASM except for the sign, is also discussed.

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“…There are wide ranges of spatiotemporal factors that affect East Asian summer monsoon. For example, the variations in the sea surface temperature (SST) over the tropical Pacific, such as El Niño–Southern Oscillation (ENSO) [ Chang et al , ; Yim et al , ; Kim et al , ; Shin et al , ; Yun et al , ] and Indian Ocean [ Xie et al , ], as well as local ocean‐atmosphere feedback processes [ Lee et al , ; Xiang et al , ], affect the summer climate over East Asia. The atmospheric variations, such as the western Pacific subtropical high [ Lu and Dong , ; Yun et al , ], Okhotsk high [ Tachibana et al , ], and Pacific‐Japan atmospheric teleconnection pattern [ Nitta , ; Kosaka and Nakamura , ] also play a significant role in the East Asian summer climate.…”

Section: Introductionmentioning

confidence: 99%

Distinct mechanisms of Korean surface temperature variability during early and late summer

et al. 2017

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Several climate factors were identified that affect the surface air temperature (SAT) variations in Korea during summer (June‐July‐August). Korean summer SAT variation exhibits remarkable differences between early summer (June) and late summer (July and August). On one hand, the significant warming trend during early summer is primarily influenced by the global‐scale trend that is manifested in East Asia. The residual variability, obtained by removing warming trend from total SAT, represents Korean SAT variability independent of the global‐scale trend. This residual variability is closely related to the meridional dipole‐like air temperature structure between Korea and northeastern China, which is largely controlled by the atmospheric circulations over East Asia. However, this atmospheric structure does not originate from the remote oceanic forcing such as sea surface temperature (SST) variability over Pacific. During late summer, on the other hand, the Korean SAT is dominantly regulated by the atmospheric variability, which is closely related to the Pacific SST variability, while the contribution of global warming signal is insignificant. The SST anomalies in the central to eastern tropical Pacific lead to a dipole‐like atmospheric circulation from the tropics to East Asia, which modulates SAT in Korea. These results imply that the Korean SAT variability during early and late summer has different sources. That is, both the global‐scale trend and atmospheric variability over the East Asia should be considered in monitoring Korean SAT during early summer, whereas the SST variability in the central to eastern tropical Pacific needs more attention during late summer.

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Seasonal change in anomalous WNPSH associated with the strong East Asian summer monsoon

Cited by 47 publications

References 11 publications

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

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

Two Types of Strong Northeast Asian Summer Monsoon

Distinct mechanisms of Korean surface temperature variability during early and late summer

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