數(shù)值模式垂直分辨率對臺風大渦模擬的影響

doi:10.12306/2021jms.0050

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數(shù)值模式垂直分辨率對臺風大渦模擬的影響
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                        10.12306/2021jms.0050
                    
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中圖分類號:P444
基金項目:國家重點研發(fā)計劃重點專項（2017YFC1501600）

The effect of vertical resolution on the large-eddy simulation of idealized tropical cyclone

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隨著計算能力的提升,臺風數(shù)值模擬大量采用了大渦尺度模擬,其水平分辨率已達到數(shù)10 m的量級,而垂直分辨率提升不大,其問題是數(shù)值模式的垂直分辨率對臺風大渦模擬的影響如何?因此,本文利用WRF(Weather Research and Forecasting)模式開展理想臺風模擬,在不同的模式垂直層次(42,69和90層)情況下,研究并討論數(shù)值模式垂直分辨率對臺風大渦模擬的影響。結(jié)果表明,42層的垂直分辨率明顯不足,而69層和90層的垂直分辨率則都能模擬出細致的臺風邊界層小尺度結(jié)構(gòu),龍卷尺度渦旋出現(xiàn)較多。與69層試驗相比,90層試驗模擬的臺風強度要弱、龍卷尺度渦旋數(shù)量要少,但模擬的臺風強度更穩(wěn)定,模擬的小尺度渦旋也更精細。

Abstract:

With the improvement of computing power, the numerical simulation of Tropical Cyclone (TC) has adopted a large number of Large-eddy Simulations (LES), and its horizontal resolution has reached the order of 10 m, while the vertical resolution of the numerical model has not improved much. The question is how does the vertical resolution of the numerical model affect the Tropical Cyclone Large-eddy Simulation (TC-LES)? In this study, idealized Tropical Cyclone simulations are carried out using the WRF (Weather Research and Forecasting) model. To discuss the effect of vertical resolution on TC-LES with 42, 69 and 90 model vertical levels. It is found that the vertical resolution of 42 levels is clearly inadequate, while the vertical resolution of both 69 and 90 levels can simulate detailed TC small-scale organized structure of the boundary layer, with more tornado-scale vortices appearing. Compared with the N69 experiment, the N90 experiment simulates weaker TC and fewer tornado-scale vortices. But the simulated TC intensity is more stable and the simulated small-scale vortices are more detailed.

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張威,談哲敏.數(shù)值模式垂直分辨率對臺風大渦模擬的影響.氣象科學,2021,41(6):711-719 ZHANG Wei, TAN Zhemin. The effect of vertical resolution on the large-eddy simulation of idealized tropical cyclone. Journal of the Meteorological Sciences,2021,41(6):711-719

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收稿日期:2021-05-19
最后修改日期:2021-05-24
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在線發(fā)布日期: 2022-01-10
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