EVALUATION OF CORRECTIONS ON TURBULENT FLUXES OBTAINED BY EDDY COVARIANCE METHOD IN HIGH WINDS

This paper investigates processing of fast-response data and corrections of turbulent fluxes obtained by using eddy covariance method based on data collected at an offshore observation tower during three Cold-intrusion(CI)events in the South China Sea in 2010. This study presents the data processing procedure in detail and compares frictional velocities(u*), sensible heat fluxes(H) and latent heat fluxes(LE) yielded by using different averaging periods and different coordinate rotation methods; evaluates the sonic temperature correction for sensible heat flux and the Webb correction for latent heat flux as a function of 10 m wind speed(u10) during the CIs. The results show(1) that the different averaging periods of 30 min and 10 min cause biases of u*(H, LE) within 5%(15%, 62%). The values of u*(H,LE) averaged from 30 mins are mostly larger than those averaged from 10 mins. We suggest that the averaging period of 10 min is not sufficiently long to capture all scale eddies and recommend 30 min averaging period in calculating turbulent fluxes using eddy covariance method during CIs;(2) that the values of u*(H, LE) obtained from double rotation(DR2) and those obtained from planar fit rotation(PF) have good agreements and correlation coefficients between them are larger than 0.99. Because PF method requires unchanged environment and it is easier to apply DR2 method, we suggest DR2 coordinate rotation method in processing fast-response data; and(3) that the median values of frictional velocity(sensible heat flux and latent heat flux) binned according to 2 m s~(-1) intervals of u_(10) increase(decrease,increase) by less than 9%(4%, 10%) by Coriolis corrections(sonic temperature corrections, Webb corrections), which decreases(decreases, increases) with increasing u10 when u10 are 5-17 m s~(-1).     

通过数据挖掘调查气候变化的长期趋势及其因区域和地方环境而产生的空间差异（英文）

Climate change is a global phenomenon but is modified by regional and local environmental conditions.Moreover,climate change exhibits remarkable cyclical oscillations and disturbances,which often mask and distort the long-term trends of climate change we would like to identify.Inspired by recent advancements in data mining,we experimented with empirical mode decomposition(EMD) technique to extract long-term change trends from climate data.We applied GIS elevation model to construct 3 D EMD trend surface to visualize spatial variations of climate change over regions and biomes.We then computed various time-series similarity measures and plot them to examine spatial patterns across meteorological stations.We conducted a case study in Inner Mongolia based on daily records of precipitation and temperature at 45 meteorological stations from 1959 to 2010.The EMD curves effectively illustrated the long-term trends of climate change.The EMD 3 D surfaces revealed regional variations of climate change,while the EMD similarity plots disclosed cross-station deviations.In brief,the change trends of temperature were significantly different from those of precipitation.Noticeable regional patterns and local disturbances of the changes in both temperature and precipitation were identified.The trends of change were modified by regional and local topographies and land covers.     

深圳房屋建筑桩基础桩端持力层选择及入岩深度分析

结合深圳地区多年来施工房屋建筑桩基础的经验,讨论了有关深圳地区房屋建筑桩基础桩端持力层的选择和入岩深度问题,并提出了相关建议.     

京津冀协同发展的机制创新与区域政策研究

机制创新与区域政策是政府对区域发展的方向、目标、速度、格局和路径进行调控的政策手段。本文探讨了机制创新与区域政策在京津冀协同发展中的保障作用,强调京津冀协同发展必须正确处理好公平与效率的关系、人与自然的关系。根据京津冀协同发展近中期的主要任务,提出了当前机制创新与区域政策应重点服务于：有序疏解北京非首都功能、优化产业结构与空间布局、构建一体化的现代交通网络、促进基本公共服务均等化、加强生态环境保护五大方面;并基于长远和全局视角,阐述了京津冀协同发展的机制创新与宏观区域政策,包括：区域产业协同发展机制与政策、区域要素市场一体化机制与政策、区域协同创新机制与政策、区域公共服务共建共享机制与政策和区域横向生态补偿机制与政策。这些政策旨在为推动京津冀协同发展提供决策参考依据。     

前兆地电阻率资料处理的剥皮法

在台址下电阻率分层均匀的前提下，针对我国绝大多数前兆地电台单极距观测的事实与现状，提出一种试图从这种观测所获得的视电阻率时间序列中识别电阻率表层变化和深部变化的等效模型方法．分析表明，在保持布极方式和观测结果不变的前提下，任意多层的地电结构都可以视为一个二层地电结构——等效模型．本文中，等效模型上层的地电参数（电阻率和厚度）与实际模型第一层相同，下层的地电参数（电阻率）则根据等效要求，由实际模型第二层及其以下各层的地电参数经计算得到，因此，等效模型的下层包含了实际模型第二层及其以下各层的综合影响．初步研究表明，这种方法是可行的．      

福建省新世纪可持续发展的问题与对策

福建省是我国沿海地区改革开放以来经济发展迅速的省区之一。可持续发展作为我国跨世纪的基本战略,对21世纪福建省经济和社会同人口、资源、生态环境的协调发展具有重要的指导意义。本文对影响福建省今后20年可持续发展的若干重大问题,如经济的可持续发展、投资环境建设与扩大对外开放、城镇化与大中小城市的协调发展、自然资源的合理开发利用、环境保护与生态建设以及缩小区域发展差距等问题作了较深入的分析,并提出相应的对策     

贵州安龙海子农场下岔河CK_2孔的孢粉组合及古气候

安龙海子农场下岔河CK2孔的孢粉分析有55个科属,蕨类孢子及木本花粉较多.古植被由疏树蕨类(喜热的蕨类)——以松为优势的针阔叶混交林—针阔叶混交林.气候由温暖—温凉—温暧转干.其地质时代,在孔深5.27—5.61m处的泥炭层中,经~(14)C测定为5990±210a.B.P.     

扎塘赤泥库岩溶渗漏的环境水文地质研究

本文在赤泥库岩溶渗漏评价的基础上,对赤泥废水的污染效应作了分析,并用模糊数学综合评判法进行水质评价。根据一维水动力弥散理论,建立了岩溶裂隙——管道域污染质运移迭加模型,研究结果为渗漏治理提供了依据。     

贵州省学会召开第二次学术年会

1991年12月23～25日贵州省矿物岩石地球化学学会在贵州工学院召开了第二次学术年会。会议收到论文摘要55篇,到会代表48人,来自地质、有色、环保、石油、矿管、劳改系统、地校、中国科学院和高校系统等17个单位。会议传达了贵州省科协“四大”会议精神,认真学习了江泽民同志在中国科协“四大”的重要讲话。会议组织了10个大会学术报告,并分为金矿与成矿构造,低温地球化学和环境地     

西沙永兴岛西南季风期大气中CI-和SO4=核的分布特征

本文对1987年5月在西沙永兴岛观测的Cl~-核与SO_4~-核资料进行了分析。主要结果是:(1)干直径大于2μ的Cl~-核平均浓度618个/L,平均含盐量57.2μg/m~3,介于普陀与海洋岛的观测值之间,谱型呈准单调下降的幂函数递减谱;最大干直径59μ的SO_4~-核平均浓度15个/L,平均含盐量23.8μg/m~3,谱较Cl~-核谱宽得多。(2)Cl~-核与SO_4~-核浓度均随离海面高度增加而减少。(3)盐核分布与风速,波高有较好的对应关系;Cl~-核在14时出现极大值,其日变化规律与潮位有一定关系。