摘要
基于泡沫动力模型和破碎波模型,利用MASNUM海浪模式计算得到2003年渤、黄、东海的泡沫厚度,利用多层微波辐射理论及泡沫模型得到海表泡沫层的发射率及泡沫层对观测亮温的修正率。分析结果显示,泡沫层厚度在不同季节的分布特征及大小各不同,不仅与风速有关,而且与波面状态也密切相关;泡沫层的海表发射率随泡沫厚度的增大而增大,当超过某一阈值,海表泡沫层近似黑体,发射率为1。由于月平均风速及波高忽略了某些极值事件,2003-01和2003-07的月平均风速最大值仅在8m/s左右,但是海表泡沫层对亮温仍存在一定的贡献,修正率最大值约为1.2%,未来工作会进一步关注风速和波高较大的极值事件中泡沫层对观测亮温的影响。
Based on bubble dynamics model and breaking wave model,foam layer thickness in the Bohai Sea,the Yellow Sea and the East China Sea in 2003 is calculated with MASNUM wave model.Multilayer microwave emissivity theory and bubble dynamics model are employed to calculate the emissivity of the foam layer and its correction to the observed brightness temperature.Results indicate that the distribution and size of the foam layer thickness vary with seasons,which is not only related to wind speed but also closely associated with wave state.The emissivity of the foam layer increases with foam layer thickness,and can be treated as a blackbody with emissivity of 1when foam layer thickness is greater than a threshold.Since the wind data used are monthly mean,which some extreme events are smoothed out,the maximum wind speed is only about 8m/s in January and July in 2003.Nevertheless,the foam layer still contribute to the observed bright temperature with a maximum of about 1.2%.The future work will further focus on the effect of foam layer on the brightness temperature in extreme events whose wind speed and wave height are much higher.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2016年第4期486-496,共11页
Advances in Marine Science
基金
国家高技术研究发展计划项目--南海及周边海域风浪流耦合同化精细化数值预报与信息服务系统(2013AA09A506)
关键词
泡沫厚度
发射率
亮温
foam layer thickness
emissivity
brightness temperature
