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141.
In order to examine the applicability of remotely-sensed ocean color for the estimation of phytoplankton biomass and primary
production in the Oyashio region, the western subarctic Pacific, vertical distributions of chlorophylla concentration and primary production were observed in April and May 1997. Spring bloom was observed in both April and May,
and the surface concentration of chlorophylla exceeded 40 mg m−3. The relationship between the standing stocks of chlorophylla within the layer from the sea surface to one optical depth (0–1/k layer) and the surface chlorophylla concentration is expressed as a Michaelis-Menten equation. The mean ratio of the standing stock of chlorophylla in the euphotic layer to that in the 0–1/k layer was 4.41, this ratio did not significantly differ from 4.61 which was obtained at homogeneous distribution of chlorophylla within the euphotic layer. These facts suggest that the distribution of chlorophylla could be assumed to be homogeneous in the euphotic layer during the spring bloom. Results of primary production measurements
by simulatedin situ method were compared with those by an algorithm with two variables; chlorphylla and non-spectral PAR. Daily primary production in the euphotic layer estimated by the algorithm varied in a range of 38–274%
of that estimated by incubation, although the primary productions by the algorithm agreed with those by the incubation at
a half of stations. Primary production within the euphotic layer calculated using simply the surface data was the same as
that estimated using vertical distribution of chlorophylla. These results show that the primary production in the euphotic layer may be estimated from the remote sensed measurements
during the spring bloom in the Oyashio region. 相似文献
142.
福建温泉的特点及其热源,成因的探讨 总被引:3,自引:0,他引:3
主要介绍了福建温泉的水温,水量,水质,水热异常区大小,空间分布以及产出的地质,地貌的特点,对福建温泉的主要热源观点进行讨论,并对福建温泉的热源,成因和温泉的构造意义提出了初步的想法。 相似文献
143.
油气田(井)生产动态预测的灰色预测模型 总被引:2,自引:0,他引:2
本文针对辽河油田荣37块天然气藏(井)的生产动态预测中,生产数据的离散状态及不均衡的实际,较完整、系统地介绍了所引入的几个使用效果好,拟合精度高的一般灰色系统GM(1,1)模型及为解决油气田(井)生产过程中因关井、生产间断、或因工程上的与地质上的原因生产出现随机性急剧变化而引入两个改进的GM(1,1)模型-非等间距和阶跃模型。通过几种模型特征的分析对比及在辽河油田荣37块全气藏及气井的动态拟合预测 相似文献
144.
根据灌溉用水决策支持系统(DSS)和实时配水的要求,建立了霍泉泉源年出流量随机预测模型和月出流量实时预测模型.经分析表明,随机AR(p)预测模型较适合预测泉源的年出流量,月出流量实时预测模型的预测精度也较高 相似文献
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149.
欧亚大陆积雪是重要的气候预测因子,评估其在气候模式中的预测潜力可为季节气候预测和模式发展提供重要参考。本文利用IAP AGCM4的多年集合后报结果,分析了欧亚大陆春季雪水当量的可预报性。结果表明该模式对提前1月后报的欧亚大陆春季雪水当量的空间分布,主要模态及变化趋势具有较好的可预报能力。此外模式对欧亚中高纬积雪的年际异常也具有较高的预报技巧,特别是高纬度区域。可预报性来源分析则表明,大气初始异常对欧亚中高纬积雪可预报性的影响与海温异常相比显得更为重要。 相似文献
150.
Cyclic behavior and failure mechanism of self‐centering energy dissipation braces with pre‐pressed combination disc springs 下载免费PDF全文
A new type of bracing system composed of friction energy dissipation devices for energy dissipation, pre‐pressed combination disc springs for self‐centering and tube members as guiding elements is developed and experimentally studied in this paper. The mechanics of this system are explained, the equations governing its hysteretic responses are outlined and large‐scale validation tests of two braces with different types of disc springs are conducted under the condition of low cyclic reversed loading. The experimental results demonstrate that the proposed bracing system exhibits a stable and repeatable flag‐shaped hysteretic response with an excellent self‐centering capability and effective energy dissipation throughout the loading protocol. Furthermore, the maximum bearing force and stiffness are predicted well by the equations governing its mechanical behavior. Fatigue and destructive test results demonstrate that the proposed bracing system can maintain stable energy dissipation and self‐centering capabilities under large deformation cyclic loading even when the tube members exceed the elastic limit and that a larger bearing capacity is achieved by the system that has disc springs without a bearing surface. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献