Decadal warming of the coldest Antarctic Bottom Water flow through the Vema Channel
Decadal warming of the coldest Antarctic Bottom Water flow through the Vema Channel
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DOI：
10.1029/2007gl030340
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发表时间：
2007-07-26
影响因子：
5.2
通讯作者：
Morozov, Eugene
中科院分区：
文献类型：
--
作者：
Zenk, Walter;Morozov, Eugene
重新分析流经维马海峡的南极底层水的十年变暖趋势。我们的数据库由 94 个高精度全深度观测站组成，这些观测站来自对 Vema Sill 的 19 次访问以及在另外两个关键地点的 12 次中途停留。最初，在自 1972 年以来的一段深海温度相当稳定的时期之后，从 1992 年开始，近底急流的温度出现了长期上升。从今天的角度来看，直到 1991 年为止明显的停滞温度水平可以解释为与随后 15 年中 2.8 mK yr(-1) 的明显变暖趋势相比，这是一段微弱的上升时期。然而，明显的温度上升叠加了波动。可用的时间序列第一次出现足够长的时间来指示底层水的相关轻微清新。我们试图将观察到的变化追溯到威德尔海的源区。
A decadal warming trend of Antarctic Bottom Water flowing through the Vema Channel is reanalyzed. Our data base consists of 94 high precision, full depth stations from 19 visits to the Vema Sill plus twelve stopovers at two additional key locations. Originally a long-term temperature increase in the near-bottom jet was noted from 1992 onward, after a period of rather constant abyssal temperatures since 1972. From today's perspective the apparent stagnant temperature level until 1991 can be interpreted as a period of feeble rising in comparison with a perspicuous warming trend of 2.8 mK yr(-1) in the following 15 years. However, the clearly manifested temperature rise is superimposed with fluctuations. For the first time the available time series appears long enough to indicate an associated slight freshening of the bottom water. An attempt is made to trace the observed variability back to its source region in the Weddell Sea.