长江口中肋骨条藻赤潮发生过程环境要素分析──营养盐状况   总被引：34，自引：6，他引：34  

洪君超  黄秀清  蒋晓山  王桂兰 《海洋与湖沼》1994,25(2):179-184

从长江口１９９０年６月的一次中肋骨条藻赤潮发生过程中营养盐含量变化可见，由于潮汐的作用，观测水域各营养盐要素都在不同程度上存在周日波动特征，其中，ＮＯ３－Ｎ在一个潮周期内变化幅度可达１倍以上。赤潮发生时表层水体ＮＯ３－Ｎ，ＰＯ４－Ｐ和ＳｉＯ３－Ｓｉ值都呈下降趋势，降幅最大的ＰＯ４－Ｐ达３倍上；Ｎ／Ｐ值则急剧上升，峰值为４５０。随着赤潮肖亡，ＮＯ３－Ｎ，ＮＯ２－Ｎ和ＳｉＯ３－Ｓｉ浓度很快恢复正常，Ｎ  相似文献   

大深度触底指示器Pinger换能器及其声反射系统     

王清池  许肖梅  许鹭芬  黄锡明 《海洋科学》1997,21(6):61-63

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The impact of several chemical poisons on the absorbing ⁴⁵Ca by the Arca granosa     

Cai Fulong  Chen Ying  Huang Lingyi 《海洋学报(英文版)》1992,11(3):435-440

The impact of several chemical poisons on the Arca granosa absorbing 45Ca was studied. The results showed that the absorption of 45Ca in the blood and the soft tissue by Arca granosa was inhibited by the inorganic compounds of Cu, Zn, Pd, Cd, Hg and so on, among which the inhibition of Cd was the strongest, next was that of Cu and Hg. But the inhibition of the absorption of 45Ca in the shell of Arca granosa was little. The impact of three kinds of energy metabolism inhibitory substances on the absorption of 45Ca by the Area granosa showed that the absorption was an active transfer process.  相似文献   

三峡工程对河口及邻近海域渔业影响的初步探讨     

罗秉征  薛频  卢继武  黄颂芳 《海洋科学集刊》1992,(33):341-352

河口只是河流与海洋之间的一小部分水域,但对人类社会的发展和生物的进化起着重要的作用。它不仅是生物种群繁殖、育幼和栖息的场所,而且是溯河和降海鱼类洄游的必经之路,因此,河口对生物种群的繁衍延续和资源补充,以及保持生态平衡具有十分重要的意义。 然而,河口又是生态环境十分脆弱和敏感的水域,同时也是受人类干扰最为严重的区域。因此,河口的生态环境问题愈来愈引起人们的关注,其中包括长江三峡水库的兴建对长江口及其附近海域生态、环境的影响,特别是对位于河口两侧的我国著名两大渔场——舟山渔场和吕四渔场的影响问题。影响渔业资源的因子是多方面而且错综复杂的。本文主要通过长江径流的变化与环境因子变量的相关分析,并根据三峡水库不同蓄水方案,对河口近海渔业的影响问题进行初步探讨。  相似文献   

The Rossby wave as a key mechanism of Indian Ocean climate variability     

Mark R. Jury  Bohua Huang 《Deep Sea Research Part I: Oceanographic Research Papers》2004,51(12):2123-2136

We analyze the time-longitude structure of composite cases from model-assimilated ocean data in the period 1958–1998, following on from earlier work by Huang and Kinter (J. Geophys. Res. 107(C11) (2002) 3199) that studied east–west thermocline variability in the Indian Ocean. Our analysis focuses on the Rossby wave signal along the thermocline ridge in the tropical SW Indian Ocean (10°S, 60–80°E), where wind stress curl is important. Anomalous winds in the equatorial east Indian Ocean force successive Rossby waves westward at speeds of 0.1 m s⁻¹±30%. With a wavelength of 7000 km, the period of oscillation is in the range 1.9–5.2 years. The Indian Ocean Rossby wave is partially resonant with the global influence of the El Nino–Southern Oscillation, except during quasi-biennial rhythm. The presence of the Rossby wave offers potential predictability for east–west atmospheric circulation systems and climate that affect resources in countries surrounding the Indian Ocean.  相似文献   

Practical implementation of Hilbert-Huang Transform algorithm   总被引：12，自引：0，他引：12  

Huang Daji  Zhao Jinping  Su Jilan 《海洋学报(英文版)》2003,22(1):1-14

Hilbert-Huang Transform (HHT) is a newly developed powerful method for nonlinear and non-stationary time series analysis. The empirical mode decomposition is the key part of HHT, while its algorithm was protected by NASA as a US patent, which limits the wide application among the scientific community. Two approaches, mirror periodic and extrema extending methods, have been developed for handling the end effects of empirical mode decomposition. The implementation of the HHT is realized in detail to widen the application. The detailed comparison of the results from two methods with that from Huang et al. (1998, 1999), and the comparison between two methods are presented. Generally, both methods reproduce faithful results as those of Huang et al. For mirror periodic method (MPM), the data are extended once forever. Ideally, it is a way for handling the end effects of the HHT, especially for the signal that has symmetric waveform. The extrema extending method (EEM) behaves as good as MPM, and it is better t  相似文献   

青岛市大气污染时间序列分析预报方法研究   总被引：5，自引：0，他引：5  

黄磊  王赐震  王建华  于鹏 《中国海洋大学学报(自然科学版)》2001,31(1):14-20

根据青岛市大气污染监测资料 ,采用时间序列分析方法 ,建立多种预报模型 ,有原序列周期外延法、均生函数周期外延法、均生函数逐步回归法以及自回归预报法等 ,最后提出一种综合预报模型。连续预报试验表明 ,综合预报模型优于任何个别预报模型 ,有较好的预报能力。利用马尔可夫概型对污染状态 (轻、中、重 )进行了分级预报试验 ,也获得良好的效果。  相似文献   

Measurement of ²²⁴Ra, ²²⁶Ra and ²²⁸Ra in seawater using Mn-fiber adsorption-γ spectrum method   总被引：2，自引：1，他引：2  

Liu Guangshan  Huang Yipu  Chen Xinbao 《海洋学报(英文版)》2000,19(2):19-27

I~IOXThe half-lives of natural radioactive nuclides "'Ra, 226Ra and 228Ra are 3. 66 d, 5. 76 a,1600 a respectively, hence, the marine process with various time scales can be researched by taking these nuclides as tracers. Because these nuclides can be determined by measuring them or theirdaughters' a,g, y-rays, they have been applied extensively in oceanography research. Huang(1996), Huang et al. (1996 a,b) and Chen (1996) have given reviews on it.Since the contents of "'Ra, 226Ra and 228…  相似文献   

青岛海陆风三维结构的数值模拟   总被引：4，自引：1，他引：4  

常志清  吴增茂  高山红 《中国海洋大学学报(自然科学版)》2002,32(6):877-883

本文采用 1个陡地形影响修正的三维中尺度流体静力的气象学模式 ,对青岛地区海陆风的日变化规律和三维结构进行了较细致的分析。结果显示 ,青岛有多支海陆风存在 ,且每支海陆风出现的时间、强度和向内陆伸展的距离有很大的不同。这其中沿岸山地的机械和热力作用扮演着重要的角色。在观测站 ,模拟结果和实测资料等方面有较好的一致性。  相似文献   

Measurement of nuclides of uranium and thorium series of disequilibrium using γ-spectroscopy   总被引：3，自引：0，他引：3  

Liu Guangshan  Huang Yipu  Li Jing  Ye Lin 《海洋学报(英文版)》2002,21(4):505-517

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