Anomalous Anomalies in Averaged Hydrographic Data
Anomalous Anomalies in Averaged Hydrographic Data
复制标题
平均水文数据中的异常现象
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
W. Owens
中科院分区：
文献类型：
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作者：
M. Lozier;M. Mccartney;W. Owens
摘要 将最近组装的北大西洋水文数据库与 Lovitus 地图集进行比较，发现墨西哥湾流和北大西洋洋流附近存在显着差异。在主温跃层的等重表面上，莱维图斯数据库中发现了孤立的温暖咸水池，但在新数据库中却没有。使用天气数据作为时间平均气候数据的代理，结果表明，异常特征可以通过平均过程的差异来解释。为了从不规则间隔的站数据生成网格数据库，Levitus 对压力表面上的数据进行了平均，而新数据库是通过对潜在密度表面进行平均来准备的。结果表明，在急剧倾斜的等密度线区域中的压力表面上进行平均会产生具有 θ-S 特征的水团，这与当地水团不同。由此产生的异常潜在温度和盐度与大规模水流相比......
Abstract A comparison of a recently assembled hydrographic database for the North Atlantic with the Lovitus atlas shows striking differences in the vicinity of the Gulf Stream and the North Atlantic Current. On isopycnal surfaces in the main thermocline, isolated pools of warm, saline water are found in the Levitus database but are absent in the new database. Using synoptic data as a proxy for temporally averaged climatological data, it is shown that the anomalous features can be accounted for by the differences in the averaging process. To produce a gridded database from irregularly spaced station data, Levitus averaged the data on pressure surfaces while the new database was prepared with averaging an potential density surfaces. It is shown that averaging on a pressure surface in an area of sharply sloping isopycnals produces a water mass with a θ–S signature uncharacteristic of the local water mass(es). The anomalous potential temperatures and salinities that result are compared to the large-scale wate...