Impact of Atmospheric Transmittance and NLTE Correction on Simulation of High Spectral Infrared Atmospheric Sounder onboard FY-3E

IF 2.8 3区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Chenggege Fang, Peiming Dong, Yang Han, Wanlin Kan
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Abstract

With the launch of the first civilian early-morning orbit satellite Fengyun-3E (FY-3E), higher demands are placed on the accuracy of radiative transfer simulations for hyperspectral infrared data. Therefore, several key issues are investigated in the paper. First, the accuracy of the fast atmospheric transmittance model implemented in the Advanced Research and Modeling System (ARMS) has been evaluated with both the line-by-line radiative transfer model (LBLRTM) and the actual satellite observations. The results indicate that the biases are generally less than 0.25 K when compared to the LBLRTM, while below 1.0 K for the majority of the channels when compared to the observations. However, during both comparisons, significant biases are observed in certain channels. The accuracy of Hyperspectral Infrared Atmospheric Sounder-II (HIRAS-II) onboard FY-3E is comparable to, and even superior to that of the Cross-track Infrared Sounder (CrIS) onboard NOAA-20. Furthermore, apodization is a crucial step in the processing of hyperspectral data in that the apodization function is utilized as the instrument channel spectral response function to produce the satellite channel-averaged transmittance. To further explore the difference between the apodized and unapodized simulations, Sinc function is adopted in the fast transmittance model. It is found that the use of Sinc function can make the simulations fit the original satellite observations better. When simulating with apodized observations, the use of Sinc function exhibits larger deviations compared to the Hamming function. Moreover, a correction module is applied to minimize the impact of Non-Local Thermodynamic Equilibrium (NLTE) in the shortwave infrared band. It is verified that the implementation of the NLTE correction model leads to a significant reduction in the bias between the simulation and observation for this band.

大气透射率和 NLTE 校正对 FY-3E 上高光谱红外大气探测仪模拟的影响
随着首颗民用清晨轨道卫星风云三号 E(FY-3E)的发射,对高光谱红外数据辐射传递模拟的精度提出了更高的要求。因此,本文对几个关键问题进行了研究。首先,利用逐行辐射传递模型(LBLRTM)和实际卫星观测数据评估了高级研究与建模系统(ARMS)中实施的快速大气透射模型的精度。结果表明,与 LBLRTM 相比,偏差一般小于 0.25 K,而与观测结果相比,大多数信道的偏差小于 1.0 K。不过,在这两次比较中,某些信道出现了明显的偏差。FY-3E 上的高光谱红外大气探测仪-II(HIRAS-II)的精度可与 NOAA-20 上的跨轨红外探测仪(CrIS)相媲美,甚至更胜一筹。此外,光栅化是处理高光谱数据的关键步骤,因为光栅化函数被用作仪器信道光谱响应函数,以产生卫星信道平均透射率。为了进一步探讨加光栅和不加光栅模拟之间的差异,在快速透射率模型中采用了 Sinc 函数。结果发现,使用 Sinc 函数能使模拟结果更好地贴近原始卫星观测数据。与汉明函数相比,使用 Sinc 函数模拟经聚焦的观测数据时,会出现较大的偏差。此外,还应用了一个校正模块,以尽量减少短波红外波段非局部热力学平衡(NLTE)的影响。结果表明,NLTE 修正模型的实施显著减少了该波段模拟与观测之间的偏差。
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来源期刊
Journal of Meteorological Research
Journal of Meteorological Research METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
6.20
自引率
6.20%
发文量
54
期刊介绍: Journal of Meteorological Research (previously known as Acta Meteorologica Sinica) publishes the latest achievements and developments in the field of atmospheric sciences. Coverage is broad, including topics such as pure and applied meteorology; climatology and climate change; marine meteorology; atmospheric physics and chemistry; cloud physics and weather modification; numerical weather prediction; data assimilation; atmospheric sounding and remote sensing; atmospheric environment and air pollution; radar and satellite meteorology; agricultural and forest meteorology and more.
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