南极洲东部达恩利角近海海洋学和南极底层水形成回顾

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Sienna N. Blanckensee, David E. Gwyther, Ben K. Galton-Fenzi, Kathryn L. Gunn, Laura Herraiz-Borreguero, Kay I. Ohshima, Esther Portela, Alexandra L. Post, Helen C. Bostock
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引用次数: 0

摘要

南极底层水(AABW)是世界上密度最大的水团,驱动着全球温盐环流的下缘。南极底层水(AABW)仅在南极洲周围的四个区域形成,而南极洲东部的达恩利角(Cape Darnley)是最新发现的形成区域。在此,我们汇编了该地区 40 年的海洋学数据,以提供气候海洋学条件,并回顾了水团特性及其在 AABW 形成过程中的作用。我们将该区域分为三个部分(东部、中部和西部),并确定了主要水团、海流机制及其对达恩利角底层水(CDBW)形成的影响。在东段的普里兹湾,冰架水的形成为流入中段的水(冷水和淡水)提供了先决条件,这些水流向东经 68.5 ° ${sim} 68.5{}^{\circ}$,增强了达恩利角海冰的生成。这就产生了高盐度的致密陆架水(DSW)变体(高达 35.15 g/kg),我们将其命名为伯顿盆地致密陆架水。与此相反,达恩利角海盆西区产生了低盐度变体(最高达 34.85 克/千克),我们称之为尼尔森海盆浓盐水。由此形成的综合CDBW是南极洲周围形成的最温暖的AABW(温度上限为0.05 ° ${}^{circ}$ C),盐度上限为 ∼ $\{sim} $ 34.845 g/kg。我们的研究结果将有助于规划达恩利角未来的观测系统,确定CDBW在全球海洋和气候系统中的作用,以及模拟过去和未来的气候情景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Review of the Oceanography and Antarctic Bottom Water Formation Offshore Cape Darnley, East Antarctica

Antarctic Bottom Water (AABW) is the densest water mass in the world and drives the lower limb of the global thermohaline circulation. AABW is formed in only four regions around Antarctica and Cape Darnley, East Antarctica, is the most recently discovered formation region. Here, we compile 40 years of oceanographic data for this region to provide the climatological oceanographic conditions, and review the water mass properties and their role in AABW formation. We split the region into three sectors (East, Central and West) and identify the main water masses, current regimes and their influence on the formation of Cape Darnley Bottom Water (CDBW). In the eastern sector, Prydz Bay, the formation of Ice Shelf Water preconditions the water (cold and fresh) that flows into the central sector to 68.5 ° ${\sim} 68.5{}^{\circ}$ E, enhancing sea ice production in Cape Darnley Polynya. This produces a high salinity variant of Dense Shelf Water (DSW) (up to 35.15 g/kg) that we coin Burton Basin DSW. In contrast, the western sector of the Cape Darnley Polynya produces a low salinity variant (up to 34.85 g/kg) we coin Nielsen Basin DSW. The resultant combined CDBW is the warmest (upper temperature bound of 0.05 ° ${}^{\circ}$ C) AABW formed around Antarctica with an upper bound salinity of ${\sim} $ 34.845 g/kg. Our findings will contribute to planning future observing systems at Cape Darnley, determining the role that CDBW plays in our global oceanic and climate systems, and modeling past and future climate scenarios.

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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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