Air-sea carbon-dioxide flux estimated by eddy covariance method from a buoy observation

Precise measurements of the CO2 gas transfer across the air-sea interface provide a better understanding of the global carbon cycle.The air-sea CO2 fluxes are obtained by the eddy covariance method and the bulk method from a buoy observation in the northern Huanghai sea.The effects of buoy motion on flux calculated by the eddy covariance method are demonstrated.The research shows that a motion correction can improve the correlation coefficient between the CO2 fluxes estimated from two different levels.Without the CO2-H2 O cross-correlation correction which is termed as PKT correction,the air-sea CO2 fluxes estimated by eddy covariance method using the motion corrected data are nearly an order of magnitude larger than those estimated by the bulk method.After the CO2-H2 O cross-correlation correction,some eddy covariance CO2 fluxes indeed become closer to the bulk CO2 flux,whereas some are overcorrected which are in response to small water vapor flux.     

Climatology and seasonal variability of satellite-derived chlorophyll a around the Shandong Peninsula

The chlorophyll a (Chl a ) is an important indicator of marine ecosystems. The spatiotemporal variation of the Chl a greatly affects the mariculture and marine ...     

海洋牧场背景下的休闲渔业旅游发展模式研究

近年来随着产业融合的发展趋势显著,第一产业和第二产业开始向第三产业转型,海洋牧场建设发展过程中渔业与旅游业逐渐融合发展形成休闲渔业等渔业旅游形式。许多地区因地制宜形成了不同的休闲渔业发展模式,休闲渔业旅游发展多元化的趋势也在逐渐形成。文章对休闲渔业的概念进行了阐述,介绍了休闲渔业的产生与发展,并对我国休闲渔业的旅游模式进行归纳,提出当前休闲渔业发展存在的问题。如:发展观念滞后,缺乏长远规划;海洋休闲渔业产业结构单一;缺乏高素质的从业人员;科技、资金投入不足等。最后总结了海洋牧场背景下休闲渔业的未来发展趋势并对发展方向提出建议。     

海底动力环境原位监测中数据管理系统的设计

海底动力环境原位监测在海底监测中的重要性不言而喻.而数据管理系统是海底动力环境原位监测中的核心模块.数据管理系统以ARM9为硬件核心、Linux2.4.20为软件平台,集成三台深海仪器,为岸上基站与深海仪器之间提供实时的、可靠的控制及数据接口.经实验验证该系统可以稳定地为岸上基站提供实时动力环境数据,最后提出了系统还待完善的几个问题.     

长江口海域悬浮颗粒有机物的稳定氮同位素分布及其生物地球化学意义

对2006年2,5,8,11月份长江口海域表层水体中的悬浮颗粒物(SPM)进行稳定氮同位素分析,根据不同季节、不同区域内其1δ5N值的变化研究水体中氮的迁移、转化等生物地球化学过程,揭示其环境行为,从而对该海域的氮循环机制进行探索。研究发现:该海域悬浮颗粒有机物的稳定氮同位素组成(1δ5Np)分布范围较宽,在0.6‰~8.2‰之间,具有明显的时空分布特点,反映了不同程度的陆源输入和氮的生物地球化学过程的影响。口门内,表层水体中1δ5Np的变化主要受长江径流的陆源输入影响,生物地球化学作用影响较弱;最大浑浊带,水体中的悬浮颗粒有机氮受微生物的降解活动影响明显,各季节均存在不同程度的颗粒物分解作用;外海区,陆源输入减弱,悬浮颗粒物的δ15Np值主要受微藻的同化吸收作用以及一定程度的颗粒物分解作用影响。     

平台钢在海洋环境中腐蚀因子的灰色关联分析

结合海洋平台实测的pH值、温度、溶解氧、盐度、生物附着等数据,通过灰色关联算法分析了海水腐蚀因子对平台钢腐蚀的影响,并按实际影响大小进行了排序。结果表明海水腐蚀因子对于A537-1钢和SM50B-ZC钢平均腐蚀速率的影响主次顺序不同。对平台钢的腐蚀规律研究及现场应用提供了可参考的依据。     

Model Test Study on Ice-Induced Vibrations of Compliant Multi-Cone Structures

For the study on the ice-induced vibration of a compliant mono-cone structure,a series of model tests were performed from 2004 to 2006.In these tests,the ice sheet before the compliant conical structure was found to be failed in two-time breaking.Based on this important finding,model tests study of the ice force on a compliant multi-cone structure were performed from 2006 to 2007.in these tests,the ice sheet broke before each single cone non-simultaneously.The exciting energy of the total ice force was found to be in a wide range of frequencies,and the structure can be easily excited with nonlinear resonance.     

Application of Line Boundary Technique to 2D Tidal Current Simulation

To deal with the problems concerning the shore boundary,moving boundary and engineeringboundary which are encountered frequently in 2D tidal current simulation by the finite difference method,theconcept of line boundary is introduced and studied here,and then the line boundary technique in common useis proposed in this paper.Analysis of some calculation cases shows that this technique is practical,effective,and simple in 2D tidal current simulation involving different boundaries.     

神经网络反演散射计风场算法的研究

建立了一个神经网络反演卫星散射计海面风场的B-P算法,给出了一个神经网络反演风场的模型,并利用该反演算法和模型对实际卫星散射计数据进行了海面风场反演试验,对风向的多解性利用圆中数滤波方法进行排除.对神经网络训练和检验数据集分别采用ERS-1/2散射计数据和欧洲中期天气预报(ECMWF)提供的风场作为配准点数据.把反演的风速和风向与CMCD4和ECMWF的风场作了比较,它们吻合得比较好;研究表明神经网络反演海面风场是可行和高效的.     

烟台港和邻近锚地及其入境船舶压舱水中的浮游植物

本文根据2003年5月到2004年4月间烟台港和邻近锚地水域及其船舶压舱水中的浮游植物调查资料,对浮游植物的群落结构和压舱水对其影响进行了初步研究。结果表明,烟台港和临近锚地的浮游植物群落主要由温带沿岸性物种组成,以硅藻为主,还有少量甲藻和金藻;对比船舶压舱水中浮游植物群落发现:压舱水中浮游植物群落和本地群落的结构有很大差异,有害物种在压舱水中出现的频率较高。