發(fā)布時間：2018-08-30 13:10

【摘要】：基于WRF模式探究不同垂直分辨率下模式對黃海海霧的模擬表現(xiàn)。將3種垂直分層方案(35η、44η與63η)和2種邊界層方案(YSU、MYNN)組合,對10次海霧做模擬研究。統(tǒng)計分析了水平霧區(qū)與霧頂高度對垂直分辨率的敏感性,并利用1次典型個例剖析了霧頂長波輻射與霧體湍流的作用。統(tǒng)計結(jié)果顯示,提高垂直分辨率能顯著改進(jìn)水平霧區(qū)的模擬效果,改善明顯的個例在不同垂直分辨率試驗下的霧頂高度差異也較大;YSU方案相比于MYNN方案更敏感,從35η層增至44η層其試驗個例的擊中率(POD)和公正預(yù)兆得分(ETS)的平均改進(jìn)率分別提高了13.29%和10.22%。典型個例研究結(jié)果揭示,模式對霧頂長波輻射和霧體湍流作用的模擬程度強(qiáng)烈依賴垂直分辨率:粗垂直分辨率給出的湍流強(qiáng)度很弱,導(dǎo)致模擬失敗;霧頂存在"云水含量增多→長波輻射增強(qiáng)→降溫加大→云水含量增多"的正反饋過程,細(xì)垂直分辨率比粗垂直分辨率更容易維持與增強(qiáng)此反饋;只有細(xì)垂直分辨率才能模擬出霧頂長波輻射冷卻產(chǎn)生的貫穿霧體直抵海面、強(qiáng)度不弱于近海面機(jī)械湍流的浮力湍流,它導(dǎo)致霧體降溫而出現(xiàn)符合觀測事實的海溫高于氣溫的現(xiàn)象。
[Abstract]:Based on WRF model, the simulation performance of Huang Hai sea fog with different vertical resolution was studied. Three vertical stratification schemes (35 畏 -44 畏 and 63 畏) and two boundary layer schemes (YSU,MYNN) were combined to simulate 10 sea fogs. The sensitivity of horizontal fog zone and height of fog roof to vertical resolution is analyzed statistically and the effect of long wave radiation on fog body turbulence is analyzed by a typical example. The statistical results show that the improved vertical resolution can significantly improve the simulation effect of horizontal fog zone, and the difference of fog top height in different vertical resolution test cases is more sensitive than that of MYNN scheme. From 35 畏 layer to 44 畏 layer, the average improvement rates of (POD) and (ETS) are increased by 13.29% and 10.22%, respectively. The results of typical case studies show that the simulation degree of the model to the effect of long wave radiation on the top of fog and turbulence of fog body depends strongly on the vertical resolution: the turbulence intensity given by the coarse vertical resolution is very weak, which leads to the failure of simulation; There is a positive feedback process of "increasing cloud water content and increasing cloud water content". The fine vertical resolution is easier to maintain and enhance than the coarse vertical resolution. Only the fine vertical resolution can simulate the floating turbulence through the fog body which is generated by the long wave radiation cooling at the top of the fog, and the intensity is not weaker than that of the mechanical turbulence near the sea surface. It causes the fog to cool and the observed SST is higher than the temperature.
【作者單位】： 中國海洋大學(xué)物理海洋教育部重點實驗室海洋與大氣學(xué)院;
【基金】：國家自然科學(xué)基金(41276009) 海洋公益性行業(yè)科研專項(201505007) 天津興�？萍�(KJXH2014-20)
【分類號】：P732

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