Climate Dynamics

, Volume 52, Issue 5–6, pp 3631–3642 | Cite as

Monthly variability of Luzon Strait tropical cyclone intensification over the Northern South China Sea in recent decades

  • Jingru Sun
  • Fanghua XuEmail author
  • Lie-Yauw Oey
  • Yanluan Lin


A number of tropical cyclones (TCs) in the western North Pacific (WNP) pass through Luzon Strait (LS) into the South China Sea (SCS) from June to November every year. The monthly variability of the ratio of TC intensity change, Rtc, shows that majority of the LSTCs achieve their lifetime maximum intensity (LMI) over the northern SCS (WNP) during August–September (June–July and October–November). Furthermore, compared to August, LSTCs in September are more easily intensified, suggesting that atmospheric and/or oceanic environments over the northern SCS in September are more favorable for TC development. The monthly-averaged oceanic and atmospheric environmental factors, including sea surface temperature, upper-ocean warm layer depth, vertical wind shear, relative humidity and large-scale low-level vorticity, are compared. The comparison between August and September is mainly studied because of the higher LSTCs frequency in these 2 months. The intensification tendency of LSTCs in September is primarily attributed to the relative thick upper-ocean warm layer and weak vertical wind shear. The transition of East Asian summer monsoon to winter monsoon tends to provide more favorable environmental conditions in September than in August for TC intensification in the northern SCS.


Tropical cyclone intensity Northern South China Sea Vertical wind shear Upper ocean warm layer Monthly variability 



The work was supported by National Key R&D Program of China (No. 2016YFC1401408) and National Natural Science Foundation of China (No. 41576018 and No. 41606020).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System ScienceTsinghua UniversityBeijingChina
  2. 2.Graduate Institute of Hydrological & Oceanic SciencesNational Central UniversityTaoyuanTaiwan
  3. 3.Princeton UniversityPrincetonUSA

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