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国家自然科学基金(41076007)

作品数:7 被引量:51H指数:3
相关作者:赵栋梁李水清宋朝阳张宇铭更多>>
相关机构:中国海洋大学国家海洋环境监测中心更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:天文地球理学更多>>

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The Influence of Wind Speed and Sea States on Whitecap Coverage被引量:1
2019年
Callaghan and White(2009) put forward the automated whitecap extraction(AWE) technique to determine the whitecap coverage(W). An improved AWE was used to analyze images collected in the South China Sea during 2012 and 2013 and in western Pacific during 2015 to determine W. The influences of meteorological and oceanographic factors on whitecap coverage were investigated in this study. It is found that W increases with wind speed. Scale factor and exponent of parameterization for W(U10) vary greatly in different models. Overall, there is a larger scatter of W at low wind speed than at high wind speed. W decreases with the increasing of wave age. Compared with wind speed, the scatter of W is smaller with wave age, which means the impact of wave age on the whitecap coverage is more robust under various environmental conditions. There is no significant dependence on SST and whitecap coverage seems to weakly decrease with SST. W decreases with the atmospheric stability. Relationship between W and wind speed change when swells are dominant. Swell can suppress wave breaking and decrease W. The effect is independent of the deflection angle between wind wave and swell.
JIA NanZHAO Dongliang
关键词:COVERAGEAWEWAVESSTSWELL
The Influence of Advection Schemes and Turbulence Closure Models on Drag Coefficient Calculation Around a Circular Cylinder at High Reynolds Number
2011年
Different advection schemes and two-equation turbulence closure models based on eddy viscosity concept are used to compute the drag coefficient around a circular cylinder at high Reynolds number (106).The numerical results from these simulations are compared with each other and with experimental data in order to evaluate the performance of different combinations of advection scheme and two-equation turbulence model.The separate contributions from form drag and friction drag are also ana-lyzed.The computational results show that the widely used standard k-ε turbulence closure is not suitable for such kind of study,while the other two-equation turbulence closure models produce acceptable results.The influence of the different advection schemes on the final results are small compared to that produced by the choice of turbulence closure method. The present study serves as a reference for the choice of advection schemes and turbulence closure models for more complex numerical simulation of the flow around a circular cylinder at high Reynolds number.
LIN ZhenhuaZHAO DongliangSONG Jinbao
An Investigation of the Effects of Wave State and Sea Spray on an Idealized Typhoon Using an Air-Sea Coupled Modeling System被引量:3
2012年
In this study, the impact of atmospherewave coupling on typhoon intensity was investigated using numerical simulations of an idealized typhoon in a coupled atmospherewaveocean modeling system. The coupling between atmosphere and sea surface waves considered the effects of wave state and sea sprays on airsea momentum flux, the atmospheric lowlevel dissipative heating, and the wavestateaffected sea spray heat flux. Several experiments were conducted to examine the impacts of wave state, sea sprays, and dissipative heating on an idealized typhoon system. Results show that considering the wave state and seasprayaffected seasurface roughness reduces typhoon intensity, while including dissipative heating intensifies the typhoon system. Taking into account sea spray heat flux also strengthens the typhoon system with increasing maximum wind speed and significant wave height. The overall impact of atmospherewave coupling makes a positive contribution to the intensification of the idealized typhoon system. The minimum central pressure simulated by the coupled atmospherewave experiment was 16.4 hPa deeper than that of the control run, and the maximum wind speed and significant wave height increased by 31% and 4%, respectively. Meanwhile, within the area beneath the typhoon center, the average total upward airsea heat flux increased by 22%, and the averaged latent heat flux increased more significantly by 31% compared to the uncoupled run.
LIU BinGUAN ChanglongLi’an XIEZHAO Dongliang
气体交换速率和时间平均尺度对海-气碳通量估计的影响被引量:2
2013年
基于卫星资料建立的CCMP风场、ECMWF波浪和最新CO2分压数据,分别用4种以风速为单参数和2种包含海况影响的双参数气体交换速率公式,估算了全球海-气CO2通量,发现前者的结果比后者平均小30%左右,从整体上看,与单参数公式相比,双参数公式使得海洋中CO2源和汇的强度均明显增强。在此基础上,讨论了时间平均尺度对海-气CO2通量估计的影响,结果表明,标量平均法比矢量平均具有更好的稳定性,但依然使得短时间平均比长时间平均得到的CO2通量值要大,月平均与6h平均相比,单参数公式和双参数公式分别使海洋的净吸收量减少33%和5%,说明双参数公式具有较好的稳定性。研究还发现,1988—2009年间,全球平均风速有增大的趋势,2006年前后出现一个极大值,但相应的CO2年净通量基本保持稳定,甚至其绝对值有所减小、海洋的吸收能力减弱的倾向。
宋朝阳赵栋梁张宇铭
风浪和涌浪分离方法的比较被引量:28
2012年
海浪通常以风浪和涌浪混合的形式存在。文中利用模型试验和实测资料,对目前提出的一种二维谱风涌浪分离方法(2D法)和3种一维谱风涌浪分离方法(PM法、WH法、JP法)进行了检验,分析发现:2D法给出的结果整体而言最为可靠,与2D法相比,PM法明显高估了风浪成分,WH法低风速时高估了风浪,高风速时跟2D法比较接近,而JP法在整体上高估了风浪成分。通过调整分割频率的比例系数,改进了PM法,改进后的PM法给出的分离结果与2D法最为一致。
李水清赵栋梁
关键词:风浪涌浪海浪频谱
Comparison of spectral partitioning techniques for wind wave and swell被引量:3
2012年
The ocean waves are generally mixed with wind wave and swell. In order to separate these two kinds of ocean waves, many wave spectral partitioning techniques have been proposed. In this study, a two-dimensional(2D) and three one-dimensional (1D) wave spectral partitioning techniques (denoted as PM, WH, and JP) are examined based on the model simulations and in-situ observations. It is shown that the 2D technique could provide the most reliable results as a whole. Compared with 2D technique, PM and JP techniques obviously overestimate the wind-wave components, and the same situation happens for WH technique at low wind speed. With the adjustment of the partitioning frequency ratio, the 1D PM technique is modified, in which the result agree well with that of the 2D scheme.
李水清赵栋梁
关键词:SWELLPARTITION
海洋飞沫及其对海—气相互作用影响的研究进展被引量:14
2012年
按照海水滴生成机制和粒径大小,由海浪破碎生成的海洋飞沫分为膜滴、射滴和裂滴三大类,较小的海水滴在大气中滞留时间长,成为云的凝结核,对长期气候变化有重要影响,较大的海水滴参与海—气界面动量和热量交换过程,有利于热带气旋的形成和发展。海洋飞沫的生成与海上风速、海浪、海流和大气稳定度等因素有关,但由于缺乏观测数据,刻画海洋飞沫效应的关键物理量——海洋飞沫生成函数通常用海上风速进行参数化,忽略其他因素的影响,彼此间的差异非常大,给研究海洋飞沫对气候和海—气相互作用的影响造成困难,需要进一步开展海洋飞沫的观测,考虑风速之外的其他因素对海洋飞沫生成函数的作用,改进海洋飞沫热量和动量效应的参数化方案,进而阐明海洋飞沫对气候和海—气相互作用的影响。
赵栋梁
关键词:风速波浪
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