Shoreward intrusion of oceanic surface waters alters physical and biological ocean structures on the Antarctic continental shelf during winter: Observations from instrumented seals
Shoreward intrusion of oceanic surface waters alters physical and biological ocean structures on the Antarctic continental shelf during winter: Observations from instrumented seals
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冬季海洋表层水向岸入侵改变了南极大陆架的物理和生物海洋结构：仪器海豹的观测
DOI：
10.1002/lno.11914
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发表时间：
2021
影响因子：
4.5
通讯作者：
Takahashi Akinori
中科院分区：
文献类型：
--
作者：
Kokubun Nobuo;Tanabe Yukiko;Hirano Daisuke;Mensah Vigan;Tamura Takeshi;Aoki Shigeru;Takahashi Akinori
海洋环流在构建南大洋海洋生态系统中发挥着关键作用。然而，由于观测困难，人们对冰雪覆盖的大陆架海洋环流的季节性动态知之甚少。因此，我们通过在威德尔海豹上部署电导率-温度-深度 (CTD) 标签，研究了海洋条件的时空变化及其对南极洲东部 (35°E–50°E) 大陆架的生物影响。海豹从标记位置向东移动了 633 公里。我们成功获得了 7 个海豹的 1254 个 CTD 铸件。冬季水 (WW) 最为普遍（占总数据的 77.4%），其次是过冷水（14.2%）、南极地表水（AASW：7.4%）、改良绕极深水（mCDW；0.9%）和改良陆架水（0.1%）。研究期间，陆地冰层大范围破裂，秋季东风最为盛行。秋季在陆架上空的地下层观察到了 AASW，这表明 AASW 通过埃克曼传输从陆架外区域的表面侵入。特定的水团（mCDW、AASW 和 AASW 以下的 WW）对海豹的觅食行为具有积极影响。这些结果强调了秋季东风驱动海洋表层水向岸入侵陆架的重要性。这种物理过程可能会增强额外猎物的运输和积累，并增加冬季当地猎物的可用性。这一过程可能在受陆地冰影响的南极沿海海洋生态系统中发挥重要作用。
Ocean circulation plays a key role in structuring marine ecosystems in the Southern Ocean. However, the seasonal dynamics of ocean circulation are poorly understood in the ice‐covered continental shelves due to difficulties in conducting observations. We, therefore, investigated spatial and temporal variations in oceanographic conditions and their biological effects on the continental shelf off East Antarctica (35°E–50°E) by deploying conductivity–temperature–depth (CTD) tags on Weddell seals. The seals moved up to 633 km east from the tagging location. We successfully obtained 1254 CTD casts from seven seals. Winter Water (WW) was most prevalent (77.4% of the total data), followed by Supercooled Water (14.2%), Antarctic Surface Water (AASW: 7.4%), Modified Circumpolar Deep Water (mCDW; 0.9%), and Modified Shelf Water (0.1%). During our study period, landfast ice broke up extensively, and the easterly wind was most prevalent during autumn. AASW was observed in the subsurface layer over the shelf in autumn, suggesting that AASW intruded from the surface of off‐shelf areas through Ekman transport. Particular water masses (mCDW, AASW, and WW below the AASW) had positive effects on the seals' foraging behavior. These results highlight the importance of easterly wind‐driven shoreward intrusion of oceanic surface waters onto the shelf in autumn. This physical process may enhance transport and accumulation of additional prey and increase local prey availability during winter. Such a process may play important roles in the Antarctic coastal marine ecosystems that are influenced by landfast ice.
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南极海冰生物群
DOI：
--
发表时间：
1991
期刊：
影响因子：
--
作者：
D. Garrison
通讯作者：
D. Garrison
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
K. Ohshima;T. Takizawa;S. Ushio
通讯作者：
S. Ushio
影响因子：
4.8
作者：
Bailleul, Frederic;Pinaud, David;Guinet, Christophe
通讯作者：
Guinet, Christophe
影响因子：
2.9
作者：
R. Massom;P. Harris;K. Michael;M. Potter
通讯作者：
R. Massom;P. Harris;K. Michael;M. Potter
威德尔海豹的觅食行为及其生态意义
影响因子：
1.7
作者：
J. Plötz;H. Bornemann;R. Knust;A. Schröder;M. Bester
通讯作者：
M. Bester