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ORIGINAL RESEARCH article

Front. Mar. Sci.
Sec. Global Change and the Future Ocean
Volume 11 - 2024 | doi: 10.3389/fmars.2024.1517779
This article is part of the Research Topic Observations and Reconstruction of the Indo-Pacific Dynamic Environment: Modern and Ancient Comparison View all articles

Seasonal Differences of Wyrtki Jet Intraseasonal Variabilities

Provisionally accepted
Guojiao Cao Guojiao Cao 1Tengfei XU Tengfei XU 2*Zexun Wei Zexun Wei 2
  • 1 Jiangsu Maritime Institute, Nanjing, China
  • 2 First Institute of Oceanography, Ministry of Natural Resources, Qingdao, Shandong Province, China

The final, formatted version of the article will be published soon.

    This paper examines the intraseasonal variabilities (ISVs) of the Wyrtki Jet in boreal spring and fall and their impacts on the oceanic ISVs along the southern coast of Sumatra-Java Island. The results reveal that the Wyrtki Jet ISVs in spring are significantly stronger than those in fall, with the standard deviation of the 0-30m-averaged zonal current reaching up to 0.25 m/s in spring, while the highest value in fall is only 0.2 m/s. The Wyrtki Jet ISVs are significantly correlated with surface zonal wind anomalies and sea level anomalies (SLAs) in the equatorial Indian Ocean (EIO) at intraseasonal timescale, and are modulated by the propagation of equatorial Kelvin waves. The intraseasonal SLAs along the southern coast of the Sumatra-Java Island are significantly correlated with the Wyrtki Jet ISVs, exhibiting similar seasonal fluctuation characteristics. In spring, the Wyrtki Jet intraseasonal signals initially appear near 75°E at the equator, approximately 10 days before the positive peaks of the intraseasonal SLAs, while in fall, the Wyrtki Jet intraseasonal signals first appear about 15 days before the peaks near 60°E at the equator, which is relatively further west compared to signals in spring. In addition, the composite Wyrtki Jet ISVs in spring are approximately 0.2 m/s stronger than those in fall. The enhanced ISVs of sea surface zonal wind forcing and Wyrtki Jet in spring, relative to those in fall, indicate that the seasonality in the intraseasonal SLAs along the southern coast of Sumatra-Java is attributable to the combined effects of surface wind forcing and current fields.

    Keywords: Wyrtki Jet, Intraseasonal variability, sea level anomaly, Equatorial Indian Ocean, Sumatra-Java Island

    Received: 27 Oct 2024; Accepted: 21 Nov 2024.

    Copyright: © 2024 Cao, XU and Wei. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Tengfei XU, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, Shandong Province, China

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