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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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