Pathways, Volume Transport, and Seasonal Variability of the Lower Deep Limb of the Pacific Meridional Overturning Circulation at the Yap-Mariana Junction
Pathways, Volume Transport, and Seasonal Variability of the Lower Deep Limb of the Pacific Meridional Overturning Circulation at the Yap-Mariana Junction
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雅浦-马里亚纳交界处太平洋经向翻转环流下深肢的路径、流量输送和季节变化
DOI：
10.3389/fmars.2021.672199
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发表时间：
2021-06
影响因子：
3.7
通讯作者：
Zhixiang Zhang
中科院分区：
文献类型：
--
作者：
Jianing Wang;Fan Wang;Youyu Lu;Qiang Ma;Larry J. Pratt;Zhixiang Zhang
太平洋经向翻转环流（L-PMOC）的下深分支负责从南极到北太平洋的深水输送，通过影响热量和碳的储存和停留时间，对全球气候的调节起着重要作用。在太平洋雅浦-马里亚纳交汇处（YMJ），深水流入西太平洋的主要门户，我们从2018年到2019年在东部，南部和北方海峡部署了五个系泊系统，以探索L-PMOC的路径和变化。我们已经确定了L-PMOC途径的三种主要模式。在模式1中，L-PMOC从东马里亚纳盆地（EMB）通过东部通道侵入YMJ，然后通过北方通道向北流入西马里亚纳盆地（WMB），并通过南部通道向南流入西加罗林盆地（WCB）。在模式2中，L-PMOC从WCB和EMB侵入YMJ，然后流入WMB。在模式3中，L-PMOC来自WCB，然后流入EMB和WMB。L-PMOC在东、南、北方航道的流量输送均具有季节性。11月至4月期间（5 - 10月），流路符合模式1（模式2和3），L-PMOC转运的平均值和标准差为−4.44 ± 1.26在东、南、北方海峡，分别为-0.30 ± 1.47）、-0.96 ± 1.13（1.75 ± 1.49）和1.49 ± 1.31（1.07 ± 1.10）Sv。数值海洋模拟结果的进一步分析表明，在YMJ的L-PMOC输运是被迫的两个相邻盆地之间的深压梯度，这主要是由海面高度（SSH）和水质量在上2,000米层。L-PMOC输送的季节变化归因于当地的Ekman泵和向西传播的Rossby波。大于3，500 m的L-PMOC输送与风强迫和上层海洋过程密切相关。
The lower deep branch of the Pacific Meridional Overturning Circulation (L-PMOC) is responsible for the deep-water transport from Antarctic to the North Pacific and is a key ingredient in the regulation of global climate through its influence on the storage and residence time of heat and carbon. At the Pacific Yap-Mariana Junction (YMJ), a major gateway for deep-water flowing into the Western Pacific Ocean, we deployed five moorings from 2018 to 2019 in the Eastern, Southern, and Northern Channels in order to explore the pathways and variability of L-PMOC. We have identified three main patterns for L-PMOC pathways. In Pattern 1, the L-PMOC intrudes into the YMJ from the East Mariana Basin (EMB) through the Eastern Channel and then flows northward into the West Mariana Basin (WMB) through the Northern Channel and southward into the West Caroline Basin (WCB) through the Southern Channel. In Pattern 2, the L-PMOC intrudes into the YMJ from both the WCB and the EMB and then flows into the WMB. In Pattern 3, the L-PMOC comes from the WCB and then flows into the EMB and WMB. The volume transports of L-PMOC through the Eastern, Southern, and Northern Channels all exhibit seasonality. During November–April (May–October), the flow pathway conforms to Pattern 1 (Patterns 2 and 3), and the mean and standard deviation of L-PMOC transports are −4.44 ± 1.26 (−0.30 ± 1.47), −0.96 ± 1.13 (1.75 ± 1.49), and 1.49 ± 1.31 (1.07 ± 1.10) Sv in the Eastern, Southern, and Northern Channels, respectively. Further analysis of numerical ocean modeling results demonstrates that L-PMOC transport at the YMJ is forced by a deep pressure gradient between two adjacent basins, which is mainly determined by the sea surface height (SSH) and water masses in the upper 2,000-m layer. The seasonal variability of L-PMOC transport is attributed to local Ekman pumping and westward-propagating Rossby waves. The L-PMOC transport greater than 3,500 m is closely linked to the wind forcing and the upper ocean processes.
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影响因子：
3
作者：
Wendl MC
通讯作者：
Wendl MC
DOI：
10.1016/0011-7471(72)90040-x
发表时间：
1972-01-01
期刊：
DEEP-SEA RESEARCH
影响因子：
--
作者：
CALLAHAN, JE
通讯作者：
CALLAHAN, JE
影响因子：
2.3
作者：
Kawabe, Masaki;Fujio, Shinzou
通讯作者：
Fujio, Shinzou
DOI：
10.1016/j.dsr.2006.03.003
发表时间：
2006-06
期刊：
--
影响因子：
--
作者：
M. Kawabe;D. Yanagimoto;S. Kitagawa
通讯作者：
M. Kawabe;D. Yanagimoto;S. Kitagawa
DOI：
10.1016/b978-0-12-391851-2.00019-2
发表时间：
2013
期刊：
International Geophysics
影响因子：
--
作者：
J. Sprintall;G. Siedler;H. Mercier
通讯作者：
J. Sprintall;G. Siedler;H. Mercier