Modulation of Northwest Pacific Tropical Cyclone Genesis by the Intraseasonal Variability

Zhao, Haikun; Jiang, Xianan; Wu, Liguang

doi:10.2151/jmsj.2015-006

Cited by 64 publications

(68 citation statements)

References 76 publications

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“…Followup studies further indicated that the enhanced mid-level relative humidity and low-level cyclonic vorticity are the most important factors in modulating the location and frequency of TC genesis (e.g., Camargo et al 2007Camargo et al , 2009Jiang et al 2012;Zhao et al 2015aZhao et al , b, 2017Zhao and Wu 2017).…”

Section: Methodsmentioning

confidence: 99%

Perspective on the northwestward shift of autumn tropical cyclogenesis locations over the western North Pacific from shifting ENSO

Zhang

Yang

et al. 2017

Clim Dyn

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During the recent decades of satellite era, more tropical cyclogenesis locations (TCLs) were observed over the northwestern part of the western North Pacific (WNP), relative to the southeastern part, during the boreal autumn. This increase in TCLs over the northwestern WNP is largely attributed to the synergy of shifting El Niño-Southern Oscillation (ENSO) and the 1998 Pacific climate regime shift. Both central Pacific (CP) La Niña and CP El Niño have occurred more frequently since 1998, with only one eastern Pacific El Niño observed in autumn 2015. The change in the mean longitude of TCLs is closely linked to the ENSO diversity, whereas the change in the mean latitude is dominated by the warming of the WNP induced by an interdecadal tendency of CP La Niña-like events. The physical mechanisms responsible for this shifting ENSO-TCL linkage can be potentially explained by the tacit-and-mutual configurations between tropical upper-tropospheric trough and monsoon trough, on both interannual and interdecadal timescales, which is mainly due to the ENSO-related large-scale environment changes in ocean and atmosphere that modulate the WNP TCL.

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Section: Methodsmentioning

confidence: 99%

Perspective on the northwestward shift of autumn tropical cyclogenesis locations over the western North Pacific from shifting ENSO

Zhang

Yang

et al. 2017

Clim Dyn

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“…It is known that the ISV plays an important role in TC genesis and development (e.g., Liebmann et al ., ; Maloney and Hartmann, ; Huang et al ., ; Cao et al ., ; Zhao et al ., ). Liebmann et al .…”

Section: The Changes In the Higher‐frequency Activitymentioning

confidence: 99%

Northwestwards shift of tropical cyclone genesis position during autumn over the western North Pacific after the late 1990s

Cao

Liu

et al. 2019

Intl Journal of Climatology

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Previous study has suggested a northwestwards shift of tropical cyclone (TC) genesis position during autumn over the western North Pacific (WNP) after the late 1990s. This study replenishes two mechanisms to explain this inter‐decadal change in the WNP TC genesis position. The first mechanism is related to the mean state change. According to observational analysis and numerical simulations with the Geophysical Fluid Dynamics Laboratory (GFDL) atmospheric general circulation model, a La Niña‐type Pacific sea surface temperature (SST) change and the northern Atlantic Ocean warming in the late 1990s cause a dipole pattern of lower‐level circulation change, with cyclone over the northwestern WNP and anticyclone over the southeastern WNP. This pattern is favourable for more TC genesis in the northwestern WNP. The sensitivity experiments show that the contribution from the Pacific Ocean is larger than that from the northern Atlantic Ocean. The second mechanism is related to the change in the intra‐seasonal oscillation intensity, particularly the quasi‐biweekly variation. The activity of intra‐seasonal oscillations over the southeastern WNP shows a decadal decrease around the late 1990s. Meantime, when the intra‐seasonal oscillations with tilted structure move northwestwards, they provide a favourable condition for TC genesis to be located more northwestwards after the late 1990s.

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“…Extended empirical orthogonal function (EEOF) analysis (Weare and Nasstrom, ) is used in this study to extract the ISO modes, following previous studies (Jiang and Waliser, , ; Jiang et al ., ; Zhao et al ., , , 2016; Neena et al ., 2017). EEOF analysis of the daily 10‐ to 30‐day band‐pass filtered TRMM rainfall anomalies during the boreal summer for the period 1998–2015 is performed (as in Jiang et al .…”

Section: Methodsmentioning

confidence: 99%

“…() and Zhao et al . (, )), with temporal lags of 9 days over the following domain: (0°–30°N, 140°–90°W). The boreal summer QBWO mode over the ENP basin is identified by the first leading pair of EEOF modes (Figure ), as shown in Jiang and Waliser (, ).…”

Section: Methodsmentioning

confidence: 99%

Impact of the boreal summer quasi‐biweekly oscillation on Eastern North Pacific tropical cyclone activity

Zhao

Raga

Klotzbach

2017

Intl Journal of Climatology

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Several studies have focused on the impact of the Madden–Julian Oscillation (MJO, with a period between 30 and 60 days) on boreal summer tropical cyclone (TC) activity over the Eastern North Pacific (ENP) basin. The quasi‐biweekly oscillation (QBWO), with a period of about 20 days, is another dominant mode of intra‐seasonal variability during the boreal summer over the ENP basin. There have been fewer studies focused on the influence of the QBWO on tropical cyclogenesis over the ENP basin. The exploratory analyses performed in this study suggest that the QBWO has a strong impact on boreal summer ENP TC activity, with enhanced TC activity during the convectively active phase. The significant increase (decrease) of tropical cyclogenesis events during the convectively active (inactive) QBWO phase is found to be closely associated with the strengthening (weakening) of the low‐level cyclonic circulation and increasing (decreasing) mid‐level relative humidity (vertical wind shear) over the ENP. Mid‐level relative humidity and low‐level vorticity are found to be the two most important players in modulating TC genesis location and frequency, based upon the analyses of the anomalous genesis potential index pattern and its magnitude associated with the QBWO. Associated with changes in TC location and large‐scale steering flows, distinct difference in TC tracks during different QBWO phases can be readily found and thus cause substantial differences in basin‐wide TC intensity. This study enhances our understanding of the modulation of intra‐seasonal oscillations on boreal summer ENP TC activity and has the potential to aid in the sub‐seasonal prediction of ENP TC activity.

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Modulation of Northwest Pacific Tropical Cyclone Genesis by the Intraseasonal Variability

Cited by 64 publications

References 76 publications

Perspective on the northwestward shift of autumn tropical cyclogenesis locations over the western North Pacific from shifting ENSO

Perspective on the northwestward shift of autumn tropical cyclogenesis locations over the western North Pacific from shifting ENSO

Northwestwards shift of tropical cyclone genesis position during autumn over the western North Pacific after the late 1990s

Impact of the boreal summer quasi‐biweekly oscillation on Eastern North Pacific tropical cyclone activity

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