کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9480659 1626717 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A novel method for tracing coastal water masses using Sr/Ca ratios and salinity in Nanwan Bay, southern Taiwan
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
A novel method for tracing coastal water masses using Sr/Ca ratios and salinity in Nanwan Bay, southern Taiwan
چکیده انگلیسی
A new method using two tracers, namely, the high-precision Sr/Ca ratio and salinity, has been successfully applied to quantitative determination of mixing proportions of freshwater, intruding surface seawater and upwelled water in a semi-enclosed bay, Nanwan Bay, southern Taiwan, where strong upwelling is induced by tidal forcing. The Sr/Ca ratio of the coastal water is essentially determined by the mixing ratio of the offshore surface water and the upwelled water, which usually have different Sr/Ca ratios. On the other hand, variability of coastal water salinity is strongly influenced by fresh water input. A Sr/Ca-salinity (Sr/Ca-S) diagram can thus be used to decipher the endmember contributions. During the 1994 dry season it was found that the Nanwan water was composed mainly of two components: 75.0% upwelled water from depths of 100-200 m offshore, and 25.0% offshore surface water. In the wet season an additional 2.0-2.5% fresh water, primarily from rainfall and surface runoff, was added to the bay. Validity of this model is confirmed by the agreement between the observed δ18O value of the bay water and that calculated from model-derived mixing proportions using the endmember compositions. Once the mixing proportions were determined, the freshwater input rate provided a scaling factor for estimating the turnover rate of the bay water. The case study has thus demonstrated that the Sr/Ca-S relationship may serve as a novel tool for distinguishing different water masses and assessing the upwelling strength in a coastal environment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 65, Issues 1–2, October 2005, Pages 135-142
نویسندگان
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