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\begin{document}

\title{Significant Northward Jump of the Western Pacific Subtropical High: the
Interannual Variability and Mechanisms}



\author[1]{YaNing Wang}%
\author[1]{Haibo HU}%
\author[2]{Xuejuan Ren}%
\author[1]{Xiu-Qun Yang}%
\author[3]{Kefeng Mao}%
\affil[1]{Nanjing University}%
\affil[2]{CMA-NJU Joint Laboratory for Climate Prediction Studies}%
\affil[3]{National University of Defense Technology}%


\vspace{-1em}



  
  \date{May 26, 2024}


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\begin{abstract}
The intensity and position of the western Pacific subtropical high
(WPSH) have crucial effects on climate and disaster events in East Asia
during summer. The WPSH significant northward jump (SNJ) events are the
main manifestation of the seasonal evolution of WPSH, which are
important for the precipitation over East Asia. Using the daily
reanalysis datasets from year 1979 to 2020, this study further defines
the early and late SNJ events of WPSH on the interannual timescale,
which are connected separately with the tropical, mid-latitude
subseasonal signals and the local air-sea interaction. However, the
mechanisms of the WPSH-SNJ events are different in the anomalous early
and late years. In the early SNJ years, the subseasonal signals from the
mid-level East Asia-Pacific teleconnection pattern or the low-level
boreal summer intraseasonal oscillation cause the positive 500 hPa
geopotential height anomalies, which contribute to the significant WPSH
northward jump in the first pentad of July. However, the above factors
are unable to cause the WPSH-SNJ in the late years. Until the second
pentad of August, the collaborative effects between mid-high latitudes
wave trains over high levels and cold SST anomalies in the core region
lead to the barotropic geopotential height anomalies and the lagged
northward jump of WPSH%
\end{abstract}%



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