The characteristics and possible growth mechanisms of the quasi-biweekly Pacific–Japan teleconnection in Boreal Summer

Zhu, Yu; Wen, Zhiping; Guo, Yuanyuan; Chen, Ruidan; Li, Xiuzhen; Qiao, Yunting

doi:10.1007/s00382-020-05448-3

Cited by 19 publications

(12 citation statements)

References 68 publications

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“…Fifth, active cumulus convection over the NWP could serve as an important energy source to provide APE for the perturbations. The above energy conversion/generation processes are vital to the formation of robust interannual variabilities over the EA-NWP, which are usually characterized by zonallyelongated horizontal pattern and northwestward tilting vertical structure, such as the PJ pattern (Xu et al 2019;Zhu et al 2020). As suggested in Figure 3, the NWP background mean states change dramatically from early to mid-summer, then how will these changes lead to variations in El Niño-induced circulation anomalies over the EA-NWP?…”

Section: A Mean State Changes From Early To Mid-summermentioning

confidence: 99%

Intensification and Northward extension of Northwest Pacific anomalous anticyclone in El Niño decaying mid-summer: an energetic perspective

Tang

Huang

et al. 2021

Clim Dyn

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The Northwest Pacific (NWP) anomalous anticyclone (AAC) intensifies and extends northward from El Niño decaying early to mid-summer despite the dissipating sea surface temperature anomalies in the North Indian Ocean, North Atlantic and tropical NWP. The present study investigates these two intraseasonal variations of AAC from the perspective of energetics. The efficiency of dry energy conversion from background mean flow to perturbations in the El Niño decaying mid-summer is high and well explains the intensification of El Niño-induced circulation anomalies over the East Asia (EA)-NWP. The baroclinic energy conversion plays a more dominant role in this process than barotropic energy conversion.Besides, mean state changes over the EA-NWP from early to mid-summer are found in favor of the northward shift of the preferred latitude of the circulation anomalies. Thus, the El Niñoinduced circulation anomalies over the EA-NWP are more northward-extended in the later period. Empirical orthogonal function analyses further confirm that the northward extension of El Niño-induced circulation anomalies over the EA-NWP stems from local optimal mode change from early to mid-summer.

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Section: A Mean State Changes From Early To Mid-summermentioning

confidence: 99%

Intensification and Northward extension of Northwest Pacific anomalous anticyclone in El Niño decaying mid-summer: an energetic perspective

Tang

Huang

et al. 2021

Clim Dyn

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“…Zhu et al. (2020) revealed a weaker R sd anomaly (60 W m −2 ) and a stronger Q l anomaly (−45 W m −2 ). The interannual variation of QBWO might have caused the differences (Mao & Chan, 2005).…”

Section: Summariesmentioning

confidence: 96%

“…The response in the sea surface turbulent heat fluxes to QBWO from Yang et al (2021) is comparable to this study. Zhu et al (2020) revealed a weaker R sd anomaly (60 W m −2 ) and a stronger Q l anomaly (−45 W m −2 ). The interannual variation of QBWO might have caused the differences (Mao & Chan, 2005).…”

Section: Summariesmentioning

confidence: 98%

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Sea Surface Energy Fluxes' Response to the Quasi‐Biweekly Oscillation: A Case Study in the South China Sea

Qi,

Han,

Yang

et al. 2023

Geophysical Research Letters

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The South China Sea (SCS) owns the world's strongest quasi‐biweekly oscillation (QBWO) in boreal summer, but the mechanism is still unclear. This case study summarizes two modes of QBWO over the summer SCS in 2019 by using empirical orthogonal function on the 10–20‐day bandpass‐filtered outgoing longwave radiation fields. The maximum positive irradiance anomalies for the two modes are 90 W m−2. The upward solar and downward longwave radiation anomalies own about 4%–8% of the irradiance magnitude, and the surface upward longwave radiation shows a weak response. Sea surface turbulent heat fluxes' responses to QBWO display different spatial patterns compared to radiation fluxes. Their changes are mainly ascribed to the surface wind in Mode1 and the air‐sea thermal contrast in Mode2. We also discuss the cause and impact of sea surface turbulent heat fluxes on QBWO.

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“…The WNPSM convective heating has significant remote influence on the East Asian summer monsoon variability at various timescales from subseasonal to interannual timescales (Hirota & Takahashi, 2012; Hsu & Lin, 2007 and Kosaka et al, 2011, 2012, among others) through the exciting of a Rossby wave train, i.e. the Pacific‐Japan pattern (Gong et al, 2018; Kosaka & Nakamura, 2006, 2010; Nitta, 1987; Sun et al, 2021; Wang et al, 2016; Zhu et al, 2020). At the same time, both observational and numerical studies indicate that the WNPSM diabatic heating can further affect Southern Hemisphere circulations at interannual timescale, leading to the establishment of an anomalous high over Australia (Liu & Wang, 2013), and a Rossby wave train propagating from the subtropical eastern Indian Ocean southeastward to the high‐latitude South Pacific and then moving northeastward into South America (Lin, 2009).…”

Section: Introductionmentioning

confidence: 99%

A new subseasonal atmospheric teleconnection bridging tropical deep convection over the western North Pacific and Antarctic weather

Sun

Tan

2022

Atmospheric Science Letters

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Previous studies indicate that convective heating variability of the western North Pacific summer monsoon (WNPSM) influences strongly weather and climate over East Asia. Based on daily reanalysis data and interpolated outgoing longwave radiation (OLR) data, this study demonstrates that the WNPSM convection can also cause severe weather events remotely over the Antarctic through the exciting of the Australia-South Pacific-Atlantic wave train (ASPA pattern). Surface air temperature (SAT) rises over the Ross Sea-Mawson-Dumont d'Urville Seas sector and over the Weddell Sea, while the SAT drops over the Amundsen-Bellingshausen Seas. Concurrently, sea ice concentration (SIC) is reduced over the Ross Sea and enhanced over the Amundsen-Bellingshausen Seas. The result suggests that the newly found ASPA pattern may serve as an important bridge linking the WNPSM convection and the weather over the Antarctic region.The dynamics of ASPA's formation and propagation are also investigated comprehensively. Day-to-day energy budget analysis suggests that after its initiation by WNPSM convection, the ASPA pattern is driven by the baroclinic energy conversion from the climatological flow and nonlinear term. The barotropic energy conversion from the climatological flow contributes to positive KE tendency before day +1 and negative KE tendency after day +1. It is therefore extremely important to improve the representations of the climatological-mean sea ice and jet stream, wave-mean flow interaction and wave-wave interaction in the mid-and high-latitudes of the Southern Hemisphere, as well as the convection over the WNPSM region of the Northern Hemisphere in numerical model for a better weather prediction for the Antarctic.

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The characteristics and possible growth mechanisms of the quasi-biweekly Pacific–Japan teleconnection in Boreal Summer

Cited by 19 publications

References 68 publications

Intensification and Northward extension of Northwest Pacific anomalous anticyclone in El Niño decaying mid-summer: an energetic perspective

Intensification and Northward extension of Northwest Pacific anomalous anticyclone in El Niño decaying mid-summer: an energetic perspective

Sea Surface Energy Fluxes' Response to the Quasi‐Biweekly Oscillation: A Case Study in the South China Sea

A new subseasonal atmospheric teleconnection bridging tropical deep convection over the western North Pacific and Antarctic weather

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