期刊
NATURE CLIMATE CHANGE
卷 10, 期 12, 页码 1116-U76出版社
NATURE RESEARCH
DOI: 10.1038/s41558-020-00918-2
关键词
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资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB42040402]
- National Key R&D Program of China [2017YFA0603202]
- Key Deployment Project of Centre for Ocean Mega-Research of Science, CAS [COMS2019Q01]
- National Science Foundation
Seawater generally forms stratified layers with lighter waters near the surface and denser waters at greater depth. This stable configuration acts as a barrier to water mixing that impacts the efficiency of vertical exchanges of heat, carbon, oxygen and other constituents. Previous quantification of stratification change has been limited to simple differencing of surface and 200-m depth changes and has neglected the spatial complexity of ocean density change. Here, we quantify changes in ocean stratification down to depths of 2,000 m using the squared buoyancy frequencyN(2)and newly available ocean temperature/salinity observations. We find that stratification globally has increased by a substantial 5.3% [5.0%, 5.8%] in recent decades (1960-2018) (the confidence interval is 5-95%); a rate of 0.90% per decade. Most of the increase (similar to 71%) occurred in the upper 200 m of the ocean and resulted largely (>90%) from temperature changes, although salinity changes play an important role locally.
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