渤、黃、東海泡沫厚度的分布及對(duì)亮溫的修正
發(fā)布時(shí)間：2019-04-10 10:28
【摘要】：基于泡沫動(dòng)力模型和破碎波模型,利用MASNUM海浪模式計(jì)算得到2003年渤、黃、東海的泡沫厚度,利用多層微波輻射理論及泡沫模型得到海表泡沫層的發(fā)射率及泡沫層對(duì)觀測(cè)亮溫的修正率。分析結(jié)果顯示,泡沫層厚度在不同季節(jié)的分布特征及大小各不同,不僅與風(fēng)速有關(guān),而且與波面狀態(tài)也密切相關(guān);泡沫層的海表發(fā)射率隨泡沫厚度的增大而增大,當(dāng)超過(guò)某一閾值,海表泡沫層近似黑體,發(fā)射率為1。由于月平均風(fēng)速及波高忽略了某些極值事件,2003-01和2003-07的月平均風(fēng)速最大值僅在8m/s左右,但是海表泡沫層對(duì)亮溫仍存在一定的貢獻(xiàn),修正率最大值約為1.2%,未來(lái)工作會(huì)進(jìn)一步關(guān)注風(fēng)速和波高較大的極值事件中泡沫層對(duì)觀測(cè)亮溫的影響。
[Abstract]:Based on the foam dynamic model and the breaking wave model, the foam thickness of the Bohai Sea, Yellow Sea and East China Sea in 2003 is calculated by using the MASNUM wave model. The emissivity of the sea surface foam layer and the correction rate of the foam layer to the observed brightness temperature are obtained by using the multi-layer microwave radiation theory and the foam model. The results show that the thickness of foam layer is different in different seasons, which is related not only to wind speed but also to wavefront state. The surface emissivity of the foam layer increases with the increase of foam thickness. When a certain threshold is exceeded, the emissivity of the foam layer is similar to blackbody, and the emissivity is 1. Because the monthly average wind speed and wave height ignore some extreme events, the maximum monthly mean wind velocity in 2003 / 01 and 2003 / 07 is only about 8m/s, but the sea surface foam layer still has a certain contribution to the brightness temperature, and the maximum correction rate is about 1.2%. Future work will pay more attention to the influence of foam layer on observed brightness temperature in extreme events with high wind speed and wave height.
【作者單位】： 國(guó)家海洋局第一海洋研究所;海洋環(huán)境科學(xué)與數(shù)值模擬國(guó)家海洋局重點(diǎn)實(shí)驗(yàn)室;中國(guó)海洋大學(xué);
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃項(xiàng)目——南海及周邊海域風(fēng)浪流耦合同化精細(xì)化數(shù)值預(yù)報(bào)與信息服務(wù)系統(tǒng)(2013AA09A506)
【分類號(hào)】：P731.2;P715.7
本文編號(hào)：2455723
[Abstract]:Based on the foam dynamic model and the breaking wave model, the foam thickness of the Bohai Sea, Yellow Sea and East China Sea in 2003 is calculated by using the MASNUM wave model. The emissivity of the sea surface foam layer and the correction rate of the foam layer to the observed brightness temperature are obtained by using the multi-layer microwave radiation theory and the foam model. The results show that the thickness of foam layer is different in different seasons, which is related not only to wind speed but also to wavefront state. The surface emissivity of the foam layer increases with the increase of foam thickness. When a certain threshold is exceeded, the emissivity of the foam layer is similar to blackbody, and the emissivity is 1. Because the monthly average wind speed and wave height ignore some extreme events, the maximum monthly mean wind velocity in 2003 / 01 and 2003 / 07 is only about 8m/s, but the sea surface foam layer still has a certain contribution to the brightness temperature, and the maximum correction rate is about 1.2%. Future work will pay more attention to the influence of foam layer on observed brightness temperature in extreme events with high wind speed and wave height.
【作者單位】： 國(guó)家海洋局第一海洋研究所;海洋環(huán)境科學(xué)與數(shù)值模擬國(guó)家海洋局重點(diǎn)實(shí)驗(yàn)室;中國(guó)海洋大學(xué);
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃項(xiàng)目——南海及周邊海域風(fēng)浪流耦合同化精細(xì)化數(shù)值預(yù)報(bào)與信息服務(wù)系統(tǒng)(2013AA09A506)
【分類號(hào)】：P731.2;P715.7
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