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首页> 外文期刊>Marine Chemistry >Spatio-temporal distributions of δ~(18)O,δD and salinity in the Arabian Sea: Identifying processes and controls
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Spatio-temporal distributions of δ~(18)O,δD and salinity in the Arabian Sea: Identifying processes and controls

机译：阿拉伯海中δ〜（18）O，δD和盐度的时空分布：识别过程和控制

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摘要

Isotopic compositions (δ~(18)O and δD) and salinity (S) of 683 surface water samples from the Arabian Sea (AS) collected during 2008-2010, were measured to understand the factors controlling the spatio-temporal distribution of these parameters. From the distributions of δ~(18)O and salinity (S), and the relationships between δ~(18)O-δD and δ~(18)O-S, the following inferences have been drawn: (1) there is a broad correspondence between the geographic distributions of the δ~(18)O and S; (2) in spite of a large scatter, a statistically significant δ~(18)O-S relationship can be identified in much of the investigated part of the AS; (3) the δ~(18)O-δD regression line for all samples clumped together has a slope of 3.2 (±0.16), much lower than that (7.37) for the global ocean surface water line (GOSWL), which in the case of the AS is seen only for samples with salinity <34; (4) the linear relationship between δ~(18)O and δD breaks down completely in the months of March-May; (5) contrary to the adjoining Bay of Bengal (BOB), both δ~(18)O and S progressively increase from the equator northwards; (6) the δ~(18)O-δD and the δ~(18)O-d-excess relationships indicate strong kinetic fractionation due to evaporation from surface waters of the AS throughout the year, with enhancement during summer months.
机译：测量了2008-2010年从阿拉伯海（AS）采集的683个地表水样品的同位素组成（δ〜（18）O和δD）和盐度（S），以了解控制这些参数的时空分布的因素。从δ〜（18）O和盐度（S）的分布，以及δ〜（18）O-δD和δ〜（18）OS之间的关系，得出以下推论：（1）有一个广义的δ〜（18）O和S的地理分布之间的对应关系； （2）尽管散布很大，但在AS的大部分被调查部分中仍可以识别出具有统计学意义的δ〜（18）O-S关系； （3）聚集在一起的所有样本的δ〜（18）O-δD回归线的斜率为3.2（±0.16），远低于全球海洋表层水线（GOSWL）的（7.37）斜率。仅在盐度<34的样品中才能看到AS的情况； （4）3-5月，δ〜（18）O与δD的线性关系完全破裂。 （5）与邻近的孟加拉湾（BOB）相反，δ〜（18）O和S都从赤道向北逐渐增加； （6）δ〜（18）O-δD和δ〜（18）O-d-过量关系表明，由于AS地表水全年蒸发，强烈的动力学分级，而夏季月份则有所增加。

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