| The sources of the upper and lower halocline water in the Canada Basin derived from isotopic tracers |
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| 作者姓名： | 陈敏 黄奕普 金明明 邱雨生 |
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| 作者单位： | 陈敏,黄奕普,邱雨生(Department of Oceanography, Xiamen University, Xiamen 361005, China);金明明(Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China) |
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| 基金项目： | This work was supported by the Chinese First Arctic Expedition Foundation. |
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| 摘 要： | The Arctic Ocean is almost entirely surrounded by land, with shallow openings to the Pacific through Bering Strait (~ 45 m deep) and to the Atlantic through the Barents Sea (~50—450 m deep) and Fram Strait where the sill depth is around 2500 m. The bathy…
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The sources of the upper and lower halocline water in the Canada Basin derived from isotopic tracers |
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| Chen?MinEmail author,Huang?Yipu,Jin?Mingming,Qiu?Yusheng.The sources of the upper and lower halocline water in the Canada Basin derived from isotopic tracers[J].Science in China(Earth Sciences),2003,46(6):625-639. |
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| Authors: | Email author" target="_blank">Chen?MinEmail author Huang?Yipu Jin?Mingming Qiu?Yusheng |
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| Institution: | 1. Department of Oceanography, Xiamen University, Xiamen 361005, China
2. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | Seawater samples were collected in the water column from the Canada Basin aboard RV Xuelong in August 1999. Concentrations of d D, d 18O, nutrients (NO3-, PO43-, SiO32-) and dis-solved oxygen were measured, along with hydrographic parameters (salinity and temperature). Our results showed that the upper layer of the water column was characterized by the occurrence of the upper halocline water (UHW) and the lower halocline water (LHW). The UHW was associ-ated with a salinity of 33.1 (~150m depth) and maximums of nutrients, NO and PO*, whereas minimums of NO and PO* (PO* = PO43- O2/175-1.95 mmol/dm3) occurred at the depth of LHW (~300m depth). Two tracer systems, S-d 18O-PO* and S-d D-SiO32-, were used to estimate the fractions of the Atlantic water, Pacific water, river runoff and sea ice meltwater in water samples. Combined with the nutrient ratio NO/PO, it was suggested that the UHW was derived from the in-flow of the Pacific water through the Bering Strait. These waters were modified to obtain the high salinity and nutrients in the Chukchi shelf or/and the east Siberian shelf. The LHW was maintained by inflow of the Atlantic water through Barents Sea and subsequent mixing with freshwater in the shelf region to produce the signals of NO and PO* minimums. In study basin, the river runoff sig-nals were confined to water depths less than 300 m and the fractions of river runoff decreased with the increasing depth. Water column inventories of river runoff and sea ice meltwater were calcu-lated between the surface and 300m. The river runoff inventories in the Canada Basin were higher than those in other sea areas, suggesting that the Canada basin is a major storage region for Arc-tic river water. The sea ice meltwater signals suggested that the Canada Basin is a region of net sea ice formation and the inventories of net sea ice in the upper water column increasing from the south to the north. |
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| Keywords: | halocline water water mass the Canada Basin 2H 18O nutrients |
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