Seasonal variability of bottom water properties off Adélie Land, Antarctica
Seasonal variability of bottom water properties off Adélie Land, Antarctica
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DOI：
10.1029/1999jc900292
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发表时间：
2000-03
影响因子：
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通讯作者：
Y. Fukamachi;M. Wakatsuchi;K. Taira;S. Kitagawa;S. Ushio;Akiyoshi Takahashi;K. Oikawa;T. Furukawa;Hiroyuki Yoritaka;M. Fukuchi;T. Yamanouchi
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文献类型：
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作者：
Y. Fukamachi;M. Wakatsuchi;K. Taira;S. Kitagawa;S. Ushio;Akiyoshi Takahashi;K. Oikawa;T. Furukawa;Hiroyuki Yoritaka;M. Fukuchi;T. Yamanouchi
阿德利地附近地区被认为是南极底层水的来源之一。在1994年12月和1995年1月以及1996年1月和2月的两次航行中对该区域进行了水文观测。沿着140°E的垂直剖面显示，底层水比上层水更冷、更新鲜。这种底层水也具有较高的溶解氧和较低的硅酸盐浓度。在142°E以西的水文资料中没有发现来自罗斯海的咸水底层水。还在该区域大陆坡的三个地点进行了海流计系泊。1995年1月至1996年3月，在其中一个系泊点（东经139°59′，南纬65°10′，深2665米）成功地获得了数据。在该系泊系统的1075、1778和2632 m深处部署了三个流速计。数据显示，下部流速计的平均流速为16.2 cm s-1，比上部两个流速计的平均流速大3倍。此外，速度和温度的变化在较低的流速计处最大。此外，速度和温度的季节性变化仅在该流速计处明显。从8月到12月，速度大5.7 cm s-1，温度低0.27°C。而且，在同一时期，它们的变异性更大。在海底附近观察到的这种季节性变化表明该区域底层水形成的季节性变化。
The region off Adelie Land is considered as one of the sources of Antarctic Bottom Water. Hydrographic observations were carried out during two cruises in December 1994 and January 1995 and January and February 1996 in this region. Vertical sections along 140°E show that bottom water is colder and fresher than the water above. This bottom water also has higher dissolved oxygen and lower silicate concentrations. The saline bottom water that originated from Ross Sea is not found in these hydrographic data obtained west of 142°E. Current meter moorings were also carried out at three locations on the continental slope in this region. At one of these moorings (139°59′E, 65°10′S, 2665 m deep), data were successfully obtained from January 1995 to March 1996. Three current meters were deployed at 1075, 1778, and 2632 m deep in this mooring. The data show that the average current speed at the lower current meter is 16.2 cm s−1, and it is about 3 times larger than those at the upper two current meters. Also, variability of speed and temperature is largest at the lower current meter. In addition, seasonal variability of speed and temperature is evident only at this current meter. From August to December, speed is larger by 5.7 cm s−1 and temperature is lower by 0.27°C. Also, their variability is larger during the same period. This seasonal variability observed near the bottom suggests seasonal variability of bottom water formation in this region.