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<p>Due to the limited availability of observations, the study of water properties at the Yap-Mariana Junction (YMJ) has been infrequent. Utilizing hydrographic data from conductivity-temperature-depth profiler collected in December 2020, this study investigates detailed water characteristics there. The results suggest that between depths of 3000 and 4000&#xa0;m, the water properties of the YMJ northern channel (YMJ-N) and eastern channel (YMJ-E) are nearly identical. However, at the depth range of 4200–5000&#xa0;m, the water properties at the YMJ-N are colder, more saline and denser, while these properties become more pronounced at the YMJ-E below 5000&#xa0;m. Seven distinct water masses are identified at different depths. Geostrophic currents flow northward on the western flank and southward on the eastern flank of the YMJ-N. At the YMJ-E, currents are westward on its northern and southern sides, with an eastward flow at lower depths in the center. The study documents a northward transport of Lower Circumpolar Deep Water (LCDW) of 0.29&#xa0;Sv at the YMJ-N and 0.11&#xa0;Sv westward transport at the YMJ-E. Diapycnal mixings at the YMJ-N and YMJ-E shows the similarities in the abyssal layers but differs significantly above 2000&#xa0;m, which is potentially due to heightened anticyclone activities. Furthermore, possible detailed connections of LCDW between the YMJ-N and YMJ-E were also discussed based on potential density and potential spicity. Our results enhance understanding of the differences and connections in water properties between these two regions.</p>

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The differences and associations of water characteristics between the Yap-Mariana Junction northern and eastern channels observed by a winter cruise

  • 期刊论文

  • 发表日期：

    2025年3月29日

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  • Zhanlin Liang,
  • Weiqiang Wang,
  • Yeqiang Shu,
  • Hongyu Xin,
  • Binbin Guo

摘要

Due to the limited availability of observations, the study of water properties at the Yap-Mariana Junction (YMJ) has been infrequent. Utilizing hydrographic data from conductivity-temperature-depth profiler collected in December 2020, this study investigates detailed water characteristics there. The results suggest that between depths of 3000 and 4000 m, the water properties of the YMJ northern channel (YMJ-N) and eastern channel (YMJ-E) are nearly identical. However, at the depth range of 4200–5000 m, the water properties at the YMJ-N are colder, more saline and denser, while these properties become more pronounced at the YMJ-E below 5000 m. Seven distinct water masses are identified at different depths. Geostrophic currents flow northward on the western flank and southward on the eastern flank of the YMJ-N. At the YMJ-E, currents are westward on its northern and southern sides, with an eastward flow at lower depths in the center. The study documents a northward transport of Lower Circumpolar Deep Water (LCDW) of 0.29 Sv at the YMJ-N and 0.11 Sv westward transport at the YMJ-E. Diapycnal mixings at the YMJ-N and YMJ-E shows the similarities in the abyssal layers but differs significantly above 2000 m, which is potentially due to heightened anticyclone activities. Furthermore, possible detailed connections of LCDW between the YMJ-N and YMJ-E were also discussed based on potential density and potential spicity. Our results enhance understanding of the differences and connections in water properties between these two regions.