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Recent decadal change in the North Atlantic subtropical underwater associated with the poleward expansion of the surface salinity maximum

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doi: 10.1029/2018JC014508
Authors:Liu Hao; Yu, Lisan; Lin Xiaopei
Author Affiliations:Primary:
Ocean University of China, CIMST/Physical Oceanography Laboratory, Qingdao, China
Other:
Woods Hole Oceanograohic Institution, United States
Volume Title:Journal of Geophysical Research: Oceans
Source:Journal of Geophysical Research: Oceans, 124(7), p.4433-4448. Publisher: Wiley-Blackwell for American Geophysical Union, Washington, DC, United States. ISSN: 2169-9275
Publication Date:2019
Note:In English. 48 refs.; illus.
Summary:Yu et al. (2017, ??url href="https://doi.org/10.1002/2017GL075772"??https://doi.org/10.1002/2017GL075772??/url??) reported that the annual mean sea surface salinity maximum (SSS-max) in the North Atlantic expanded northward by 0.35 ± 0.11° per decade over the 34-year data record (1979-2012). The expansion shifted and expanded the ventilation zone northward and increased the production of the Subtropical Underwater (STUW). As a result, the STUW became deeper, thicker, and saltier. In this study, the seasonal characteristics of the poleward expansion of the North Atlantic SSS-max and their effects on the STUW are examined. The results show that the SSS-max expansion occurred primarily during boreal spring (April, May, and June) and expanded northward by 0.43 ± 0.21° per decade over the 34-year period. The annual volume of the STUW increased by 0.21 ± 0.09 1014 m3 per decade over the same period, and the spring (April, May, and June) volume increased by 0.31 ± 0.02 1014 m3 per decade (a relative increase of 48 ± 1%). The characteristics of the decadal changes in STUW were attributable to the increased subduction rate associated with the northward expansion of the SSS-max. The annual subduction rate increased by 0.29 ± 0.07 Sv per decade over the 34 years, and the greatest increase of 1.73 ± 0.61 Sv per decade occurred in April. The change in subduction associated with the expansion of the SSS-max appeared to be consistent with the Atlantic Multidecadal Oscillation. Abstract Copyright (2019), . American Geophysical Union. All Rights Reserved.
Subjects:Annual variations; Decadal variations; Salinity; Sea water; Sea-surface salinity; Seasonal variations; Spatial variations; Temperature; Water masses; Atlantic Ocean; North Atlantic; Argo float data
Coordinates:N200000 N450000 W0000000 W0800000
Record ID:860256-5
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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