Man-induced salinity and temperature increases in western Mediterranean deep water. (Reannouncement with new availability information)
Man-induced salinity and temperature increases in western Mediterranean deep water. (Reannouncement with new availability information)
复制标题
人为引起的地中海西部深水盐度和温度升高。
DOI：
--
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
H. Bryden
中科院分区：
文献类型：
--
作者：
E. Rohling;H. Bryden
历史数据库用于研究西地中海深水(WMDW)和黎凡特中水(LIW)的性质变化。上个世纪WMDW属性的变化已经在前面描述过了，尽管数据库更有限。我们不知道以前有任何关于LIW属性变化的研究。在我们使用的广泛的数据库中，从1909年到现在，大规模杀伤性武器的温度和盐度都出现了上升，这证实了之前报道的观测结果。此外，我们发现大规模杀伤性武器的密度似乎也有所增加，这与之前关于它保持不变的说法不一致。我们观察到，从1955年开始，WMDW的温度上升表现出明显的加速，而WMDW盐度的增加也出现了类似的加速，尽管不那么明显。从我们对LiW属性的历史数据的研究中，Liw盐度似乎也自1909年以来有所增加。我们认为，WMDW的变暖趋势很可能是对盐度上升的反应，盐度上升似乎是由LIW从地中海东部输入的，因此我们的观察结果支持了最近发表的一个假说。反过来，生活盐度的增加更多地归因于地中海东部淡水预算的变化，这是直接或间接流入地中海东部的主要河流被筑坝所致。
The historical data base is used to study property changes in both the Western Mediterranean Deep Water (WMDW) and the Levantine Intermediate Water (LIW). Changes in WMDW properties during the past century have been described previously, although on a more limited data base. We are not aware of any previous study of changes in LIW properties. In the extensive data base we used, increases appear in both WMDW temperature and salinity, from 1909 to the present, which substantiate previously reported observations. In addition, we find that the density of WMDW seems to have increased as well, which disagrees with previous suggestions that it has remained constant. We observe that the WMDW temperature increase displays a distinct acceleration starting about 1955 and that a similar, although less conspicuous, acceleration occurs in the WMDW salinity increase. From our study of historical data on LIW properties, the LIW salinity also appears to have increased since 1909. We argue that the warming trend in WMDW may well be a response to the salinity increase, which seems to be imported from the eastern Mediterranean by LIW, and as such our observations endorse a recently published hypothesis. The increase in LIW salinity, in turn, is attributedmore » to changes in the eastern Mediterranean freshwater budget, resulting from damming of major rivers that drain either directly or indirectly into the eastern Mediterranean.« less