کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1263394 1496740 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of gas bubble fractionation rates in the deep ocean by laser Raman spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Determination of gas bubble fractionation rates in the deep ocean by laser Raman spectroscopy
چکیده انگلیسی

A new deep-sea laser Raman spectrometer (DORISS—Deep Ocean Raman In Situ Spectrometer) is used to observe the preferential dissolution of CO2 into seawater from a 50%–50% CO2–N2 gas mixture in a set of experiments that test a proposed method of CO2 sequestration in the deep ocean. In a first set of experiments performed at 300 m depth, an open-bottomed 1000 cm3 cube was used to contain the gas mixture; and in a second set of experiments a 2.5 cm3 funnel was used to hold a bubble of the gas mixture in front of the sampling optic. By observing the changing ratios of the CO2 and N2 Raman bands we were able to determine the gas flux and the mass transfer coefficient at 300 m depth and compare them to theoretical calculations for air–sea gas exchange. Although each experiment had a different configuration, comparable results were obtained. As expected, the ratio of CO2 to N2 drops off at an exponential rate as CO2 is preferentially dissolved in seawater. In fitting the data with theoretical gas flux calculations, the boundary layer thickness was determined to be ∼ 42 μm for the gas cube, and ∼ 165 μm for the gas funnel reflecting different boundary layer turbulence. The mass transfer coefficients for CO2 are kL = 2.82 × 10− 5 m/s for the gas cube experiment, and kL = 7.98 × 10− 6 m/s for the gas funnel experiment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Chemistry - Volume 99, Issues 1–4, 6 March 2006, Pages 12–23
نویسندگان
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