GOES-16 ABI觀測(cè)和ERA5全天空模擬亮溫揭示的熱帶對(duì)流水平特征尺度對(duì)比分析

doi:10.12306/2023jms.0084

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GOES-16 ABI觀測(cè)和ERA5全天空模擬亮溫揭示的熱帶對(duì)流水平特征尺度對(duì)比分析
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                        10.12306/2023jms.0084
                    
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中圖分類號(hào):P407
基金項(xiàng)目:國家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2018YFC1507004)

Comparison of tropical convection horizontal scales between GOES-16 ABI TB observations and ERA5 all sky simulations

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摘要:

本研究通過將GOES-16 ABI觀測(cè)亮溫和ERA5再分析資料的全天空模擬亮溫進(jìn)行對(duì)比分析,發(fā)現(xiàn)觀測(cè)亮溫和模擬亮溫對(duì)流低值區(qū)位置大體接近,也能夠定性反映出對(duì)流從發(fā)展到減弱的日變化過程,但亮溫低值區(qū)域的強(qiáng)度存在較大差異。即使把高分辨率ABI通道13觀測(cè)亮溫平均到ERA5分辨率(0.25°×0.25°),在熱帶對(duì)流區(qū)的低亮溫強(qiáng)度仍然高于ERA5全天空模擬亮溫。因此利用主成分分析(Principal Component Analysis,PCA)和離散傅里葉變換(Discrete Fourier Transform,DFT)對(duì)任意選擇的兩對(duì)流區(qū)域內(nèi)的觀測(cè)和模擬亮溫進(jìn)行了尺度分析和對(duì)比。在其中對(duì)流較強(qiáng)的區(qū)域內(nèi),當(dāng)ABI觀測(cè)亮溫的主成分分量從1增加到9時(shí),水平特征尺度從700 km逐漸減小到150 km。ERA5全天空模擬亮溫從主成分1增加到4時(shí),水平特征尺度從950 km減小到270 km空間尺度,但當(dāng)主成分4增加到9時(shí),特征尺度幾乎不變。在對(duì)流較弱的另一區(qū)域也能夠發(fā)現(xiàn)ERA5模擬亮溫對(duì)對(duì)流水平特征尺度有明顯高估。ERA5模擬亮溫各主成分的相位和觀測(cè)亮溫存在2 h以內(nèi)的誤差。由于ERA5全天空模擬亮溫低值區(qū)與ERA5云冰路徑大值區(qū)吻合度較高,由此可以推測(cè)ERA5云冰路徑誤差是造成ERA5全天空模擬亮溫與ABI觀測(cè)亮溫差別的主要原因之一。

Abstract:

In this study,GOES-16 Advanced Baseline Imager Temperature Brightness (ABI TB) observations were compared with all-sky simulations of ERA5 reanalysis data.It is found that the ERA5 simulated low TB areas are nearly consistent with those of observations,and qualitatively reflect a diurnal variation from a developing to weakening process of convection.However,there are significant differences in how low TB reached.Even if the high-resolution (2 km) channel-13 TB observations are averaged to the ERA5 resolution (0.25°×0.25°),they are still lower than the ERA5 all-sky simulations.By using Principal Component Analysis (PCA) and Discrete Fourier Transform (DFT) methods,a scale analysis on the observed and simulated TB fields in two arbitrarily selected convective areas was conducted.In the area where convection is strong,the horizontal scales gradually decrease from 700 km to 150 km for principal components of TB observations from 1 to 9.However,the horizontal scales gradually decrease from 950 km to 270 km for the principal components of ERA5 all-sky simulations from 1 to 4,but hardly change from 4 to 9.In another area with weaker convection,it can also be observed that the ERA5 simulated TB significantly overestimates the horizontal characteristic scale of convection.For ERA5 simulated TB,there is an error of within two hours for the phase of each main component compared with ABI TB observations.Since the low-TB areas of the ERA5 all-sky simulations coincide highly with the areas of large ice water path,it can be speculated that the ice water path in the ERA5 reanalysis is responsible for the differences of spatial distributions and intensity changes of TBs between ERA5 all-sky simulations and ABI observations.

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汪栩濤,鄒曉蕾. GOES-16 ABI觀測(cè)和ERA5全天空模擬亮溫揭示的熱帶對(duì)流水平特征尺度對(duì)比分析.氣象科學(xué),2024,44(1):125-137 WANG Xutao, ZOU Xiaolei. Comparison of tropical convection horizontal scales between GOES-16 ABI TB observations and ERA5 all sky simulations. Journal of the Meteorological Sciences,2024,44(1):125-137

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收稿日期:2023-11-05
最后修改日期:2023-12-03
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在線發(fā)布日期: 2024-03-13
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