globalchange  > 气候减缓与适应
DOI: 10.1002/2017JC013375
Scopus记录号: 2-s2.0-85041131482
论文题名:
Changes in Bottom Water Physical Properties Above the Mid-Atlantic Ridge Flank in the Brazil Basin
作者: Zhao J.; Thurnherr A.M.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:1
起始页码: 708
结束页码: 719
语种: 英语
英文关键词: AABW ; abyssal stratification ; decadal change
Scopus关键词: abyssal zone ; Antarctic Bottom Water ; buoyancy ; fracture zone ; global ocean ; hydrography ; long-term change ; North Atlantic Deep Water ; quantitative analysis ; Atlantic Ocean ; Brazil Basin ; Mid-Atlantic Ridge
英文摘要: Warming of abyssal waters in recent decades has been widely documented around the global ocean. Here repeat hydrographic data collected in 1997 and 2014 near a deep fracture zone canyon in the eastern Brazil Basin are used to quantify the long-term change. Significant changes are found in the Antarctic Bottom Water (AABW) within the canyon. The AABW in 2014 was warmer (0.08 ± 0.06 °C), saltier (0.01 ± 0.005), and less dense (0.005 ± 0.004 kg m-3) than in 1997. In contrast, the change in the North Atlantic Deep Water has complicated spatial structure and is almost indistinguishable from zero at 95% confidence. The resulting divergence in vertical displacement of the isopycnals modifies the local density stratification. At its peak, the local squared buoyancy frequency (N2) near the canyon is reduced by about 20% from 1997 to 2014. Similar reduction is found in the basinwide averaged profiles over the Mid-Atlantic Ridge flank along 25 ° W in years 1989, 2005, and 2014. The observed changes in density stratification have important implications for internal tide generation and dissipation. © 2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114723
Appears in Collections:气候减缓与适应

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作者单位: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Now at Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States

Recommended Citation:
Zhao J.,Thurnherr A.M.. Changes in Bottom Water Physical Properties Above the Mid-Atlantic Ridge Flank in the Brazil Basin[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(1)
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