Guan Shoude

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  • Article
    Intense abyssal flow through the Yap‐Mariana Junction in the western North Pacific
    (American Geophysical Union, 2022-01-28) Zhou, Chun ; Xu, Hongzhou ; Xiao, Xin ; Zhao, Wei ; Yang, Jiayan ; Yang, Qingxuan ; Jiang, Huichang ; Xie, Qiang ; Long, Tong ; Wang, Tinghao ; Huang, Xiaodong ; Zhang, Zhiwei ; Guan, Shoude ; Tian, Jiwei
    Water-mass transports in the vast and seemingly quiescent abyssal ocean, basically along topographically-guided pathways, play a pivotal role in the Earth's climate. The pulse of abyssal circulations can be taken with observations at topographic choke points. The Yap-Mariana Junction (YMJ) is the exclusive choke point through which the Lower Circumpolar Deep Water (LCDW) enters the Philippine Sea. Here, we quantify the LCDW transport and its variability based on mooring observations at the YMJ and the Mariana Trench (MT). The LCDW flows northward toward the Philippine Sea as an intensified current on the western side of the YMJ, with maximum mean velocity reaching 7.6 cm/s. The mean LCDW transports through the MT and the YMJ are 2.2 ± 1.0 Sv and 2.1 ± 0.4 Sv, respectively. Reversal flow at autumn in both the YMJ and MT is captured, indicating seasonal variability of the abyssal flow.
  • Article
    Increasing deep-water overflow from the Pacific into the South China Sea revealed by mooring observations
    (Nature Research, 2023-04-10) Zhou, Chun ; Xiao, Xin ; Zhao, Wei ; Yang, Jiayan ; Huang, Xiaodong ; Guan, Shoude ; Zhang, Zhiwei ; Tian, Jiwei
    Cold and dense water from the North Pacific Ocean that spills through the Luzon Strait, the only deep conduit between the South China Sea (SCS) and the Pacific Ocean, renews deep-water mass, modulates hydrographic and biogeochemical cycles, and drives abyssal and overturning circulations in the SCS. The variability of this key oceanic process, however, has been poorly studied, mainly due to a lack of sustained observations. A comprehensive observational program that started in 2009 has provided 12 years of continuous time series of velocity and volume transport within the Luzon Strait. Here we show the observation-based assessment of decadal trends of deep-water transport through this vital passage. With the estimated 12-year mean volume transport of the deep-water overflow into the SCS of 0.84 ± 0.39 Sv (1 Sv = 10 ms), a significant linear upward trend of 9% is revealed during this period. This is consistent with long-term changes in satellite-observed ocean bottom pressure. The results of this study may have broad implications for the overturning circulations and biogeochemical processes, including carbon cycles in this region.