海洋岛海域水温异常波动与养殖栉孔扇贝死亡的关系   总被引：2，自引：0，他引：2  

周玮  薛真福  王有君  贺先钦  林祥辉  王庆成  刘兴盛  孙景伟 《海洋湖沼通报》1992,(4)

本文对海洋岛海域水温异常波动,与该海域养殖栉孔扇贝大批死亡的关系,进行了研究。首先,总结了几年来海洋岛海域养殖栉孔扇贝死亡的特征。其次,结合水温观测数据分析了水温异常波动与栉孔扇贝大批死亡的关系。得出的结论是:大幅度、跳跃型水温异常波动是导致扇贝死亡主要原因。最后,通过生物试验证实了上述观点。  相似文献   

The concentration and distribution of dimethyl sulfide in the marine atmospheric boundary layer near the equator     

Li Xingsheng  Li Zhe  F. Parungo  C. Nagamoto 《海洋学报(英文版)》1995,14(3):355-369

Ｔｈｅｃｏｎｃｅｎｔｒａｔｉｏｎａｎｄｄｉｓｔｒｉｂｕｔｉｏｎｏｆｄｉｍｅｔｈｙｌｓｕｌｆｉｄｅｉｎｔｈｅｍａｒｉｎｅａｔｍｏｓｐｈｅｒｉｃｂｏｕｎｄａｒｙｌａｙｅｒｎｅａｒｔｈｅｅｑｕａｔｏｒ￥ＬｉＸｉｎｇｓｈｅｎｇ；ＬｉＺｈｅ；Ｆ．Ｐａｒｕｎｇｏ...  相似文献   

动态最小二乘支持向量机学习算法     

邓兴升  花向红 《武汉大学学报(信息科学版)》2008,33(11):1122-1125

针对大样本集的训练问题和动态训练样本的模型更新问题,提出了动态最小二乘支持向量机学习算法.该算法充分利用已建好的模型,逐渐加入新样本,并可删除位于任何位置的非支持向量,避免了矩阵求逆运算,保证了算法的高效率.大坝变形及电离层延迟两个时间序列的预报实例表明,该算法具有计算时间短、预报精度高的特点.  相似文献   

垂线测量数据管理软件的研制及应用     

邓兴升  王新洲  游扬声 《测绘信息与工程》2003,28(1):11-13

介绍了基于局域网络开发的垂线测量数据管理软件的组成、原理、功能、操作及应用，该软件操作简单、使用方便、极易掌握，并能通过多方位、直观的图形表示来反映监测对象的挠度、倾斜、水平位移状态。  相似文献   

天津地区大气颗粒物物化特性的研究          下载免费PDF全文

罗超  李兴生  周秀骥  卞慧生 《气象学报》1993,51(1):126-128

本文利用天津气象科学研究所铁塔,在1989年冬、夏两季对天津地区气溶胶颗粒物进行了粒度分布、成份分布等的测量研究。1 气溶胶颗粒物平均地面粒度谱分布的特征 为了减少观测数据的误差和气溶胶颗粒物随机性的起伏,我们把夏季和冬季相同天气条件下的观测值加以平均。夏季采样期间天气为一致的晴朗天气,能见度大于15km,采样期间绝大多数风向为  相似文献   

CHARACTERISTICS OF TURBULENCE SPECTRA IN DIFFERENT WEATHER PROCESSES UNDER UNSTABLE CONDITIONS^*          下载免费PDF全文

Zhu Wenqin  Zhu Cuijuan  Li Xingsheng 《Acta Meteorologica Sinica》1994,8(3):296-304

In this paper,the data chosen from measurements by supersonic anemometers in Tongxian County of Beijing in 1990 are used to study characteristics of turbulence spectra in precipitation weather.Some turbulence parameters such as turbulence intensity,heat and momentum fluxes,friction velocity,M-O length and stability parameter are calculated and their dependence on turbulence spectra in different stability conditions are analyzed.Some encouraging results are obtained and compared with others' results.  相似文献   

A numerical investigation on the interaction of turbulent and long-wave radiative fluxes in the surface layer     

Li Xingsheng  Bian Xindi  Zhong Shiyuan 《大气科学进展》1985,2(4):522-530

The interaction of turbulent and radiative transfer applied to a number of plausible atmospheric situations in the surface layer under the stably stratified condition is discussed.The calculated results show that the long-wave radiative flux has a great influence upon the thermal structure of the surface layer, and that it usually acts in such a way as to weaken the thickness of the constant turbulent heat flux layer. In the case of low wind velocities and strongly stable stratifications, the thickness of the turbulent heat flux layer will become very thin and/or inexistent.  相似文献   

A numerical study on the meso-scale pollutant dispersion over a sloped surface in the stable boundary layer     

Zhong Shiyuan  Zhou Mingyu  Li Xingsheng 《大气科学进展》1987,4(3):300-312

A numerical model is used to study the properties of pollutant dispersion over a large uniformly-sloped surface in the stable atmospheric boundary layer. By simulating the structure of boundary layer flow to improve the advective wind field and vertical eddy diffusivities included in the advection-diffusion equa-tion, this numerical model permits an estimation of the distribution of pollutant concentration for more real-istic atmospheric diffusion conditions.  相似文献   

GRADIENT MEASUREMENTS OF METHANE FLUX IN LIN''''AN RICE PADDIES          下载免费PDF全文

邵志清  李兴生  周秀骥  王木林 《Acta Meteorologica Sinica》1995,(2)

From July to September of 1990,CH_4 flux measurements were made in Lin'an rice paddies using gradient profiletechniques.Some characteristics of the turbulence structure under the stable conditions have been verified in the surfacelayer according to the in situ measurements.The semi-empirical turbulent parameters β_m,β_h and β_c and their changeswith the stability parameter Ri are given.Observed results indicate that CH_4 flux in the rice-paddy is mainly decided bythe methnogenesis and the process of CH4 transport from internal soils to the atmosphere,and that the CH_4 verticaltransfer is depressed in the stable surface layer.The CH_4 flux shows that its obvious diurnal changes,and the meanCH_4 flux are higher in nighttime and lower in daytime,and the peaks appear at about 2000 BST at night and 0300 BSTin the early morning,respectively.The mean value of CH_4 flux is about 4.18±2.3 mg/m~2 h.  相似文献   

GRADIENT MEASUREMENTS OF METHANE FLUX IN LIN’AN RICE PADDIES^*          下载免费PDF全文

Shao Zhiqing  Li Xingsheng  Zhou Xiuji  Wang Mulin 《Acta Meteorologica Sinica》1995,9(2):152-161

From July to September of 1990,CH₄ flux measurements were made in Lin'an rice paddies using gradient profile techniques.Some characteristics of the turbulence structure under the stable conditions have been verified in the surface layer according to the in situ measurements.The semi-empirical turbulent parameters β_m,β_h and β_c and their changes with the stability parameter Ri are given.Observed results indicate that CH₄ flux in the rice-paddy is mainly decided by the methnogenesis and the process of CH₄ transport from internal soils to the atmosphere,and that the CH₄ vertical transfer is depressed in the stable surface layer.The CH₄ flux shows that its obvious diurnal changes,and the mean CH₄ flux are higher in nighttime and lower in daytime,and the peaks appear at about 2000 BST at night and 0300 BST in the early morning,respectively.The mean value of CH₄ flux is about 4.18±2.3 mg/m² h.  相似文献