资料摘要
资料下载在海冰形成的过程中将光学微氧传感器(Micro-optodes)冻结在冰中,直接测量其中的氧动力状态。 Oxygen micro-optodes were used to measure oxygen dynamics directly within the microstructure of sea ice by freezing the sensors into the ice during its formation.The experiment was conducted in a 4 m3 mesocosm filled with artificial seawater and inoculated with a unialgal culture of the common Antarctic ice diatom Fragilariopsis cylindrus (Bacillariophyceae) to a final chlorophyll a (chl a) concentration of 11 μg l–1. Ice growth was initiated 7 d after inoculation by reducing the air temperature to –10 ± 2°C and terminated 17 d later. The final ice thickness was 27 cm. One optode was frozen into grease ice and 2 others into the skeletal layer of the growing ice sheet. Increasing oxygen concentrations during ice crystal formation at the water surface and the ice-water interface revealed a strong inclusion of oxygen, which was either physically trapped and/or the result of photosynthesising diatoms. The major portion of oxygen was present as gas bubbles due to supersaturation as a result of increasing salinity and oxygen production by diatoms. An increase in salinity due to a concurrent decrease in ice temperatures during subsequent sea ice development reduced the maximum concentration of dissolved oxygen within brine. Thus, dissolved oxygen concentrations decreased over time, whereas gaseous oxygen was released to the atmosphere and seawater. The sensors are a significant advance on more conventional microelectrodes, because the recordings can be temperature and salinity compensated in order to obtain precise measurements of oxygen dynamics with regard to total (dissolved and gaseous) and dissolved oxygen in sea ice. Optodes do not consume oxygen during measurement over a long period under extreme conditions, which is another advantage for long-term deployment in the field.
Stratasys? F900? 3D 打印机说明书
简介:高性能 F900 3D 打印机深受全球制造业领导者的信赖,为可靠、较精确的 3D 打印树立了标杆。无论您要打印一整盘复杂零件还是单个大型零件,F900 总能为您能带来较精确的结果。
光电测量资料
简介:博源光电目前有以下几款光电测量装置:拉曼测量装置、激光测量装置、LED测量装置、膜厚测量装置、辐照度测量套件,感兴趣的请下载宣传页进行查看。
功率计资料
简介:博源光电目前有以下几个系列的功率计:光电功率探测器、热电堆功率探测器、积分球功率探测器,感兴趣的请下载宣传页进行查看。
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简介:博源光电目前有以下几个系列的光源:氘卤光源、均匀光源、LED光源、弧灯光源,感兴趣的请下载宣传页进行查看。
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简介:博源光电目前有以下几个系列的光谱仪:微型光谱仪、高分辨率光谱仪、高灵敏光谱仪、近红外光谱仪、拉曼光谱仪,感兴趣的请下载宣传页进行查看。
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