Publication Date:
2022-10-26
Description:
Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 49, (2022): e2021GL096530, https://doi.org/10.1029/2021gl096530.
Description:
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.
Description:
This work was supported by the National Natural Science Foundation of China (Grant no. 91858203, 91958205, 42076027, 41676011), the National Key R&D Program of China (Grant no. 2018YFC0309800), the Global Change and Air–Sea Interaction Project (Grant no. GASI-IPOVAI-01-03, GASI-IPOVAI-01-02).
Description:
2022-07-28
Keywords:
Abyssal circulation
;
Yap-Mariana Junction
;
Lower circumpolar deep water
Repository Name:
Woods Hole Open Access Server
Type:
Article
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