高分辨率大气谱线并行计算方法研究  

Research on Parallel Computing Methods for High-Resolution Atmospheric Spectral Lines

作　　者：马志昂 李大成 吴军 程晨 Ma Zhiang;Li Dacheng;Wu Jun;Cheng Chen(Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,Anhui,China;Key Laboratory of General Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]安徽大学物质科学与信息技术研究院,安徽合肥230601 [2]中国科学院安徽光学精密机械研究所中国科学院通用光学定标与表征技术重点实验室,安徽合肥230031

出　　处：《光学学报》2024年第18期264-272,共9页Acta Optica Sinica

基　　金：国家自然科学基金青年基金(42105082);高分专项(52-L10D01-0613-20/22)。

摘　　要：大气谱线计算是大气辐射传输中的一个重要环节,其计算速度慢是长期以来限制大气辐射传输计算效率的主要问题之一。通过对大气透过率中谱线计算可并行性的分析,利用图形处理器(GPU)构建了基于GPU并行处理的大气谱线计算模型。针对大气环境和高温环境进行仿真计算,结果表明,相较于中央处理器(CPU),基于GPU的并行算法模型可以在达到相同精度的同时,计算速度提升1~3个数量级。在此基础上,使用Malkmus带模式参数拟合法,基于并行计算构建了相关K分布系数表,能够支持并行计算成果在无GPU或内存受限设备上的使用,提高该技术的普适性。为常规大气、高温燃气等条件下的高分辨快速辐射传输计算提供新的技术途径。Objective With the development of infrared and laser technology,the computational demand for high-resolution atmospheric gas absorption spectra is continuously increasing.Instruments featuring ultra-high spectral resolution,exemplified by the Tropospheric Emission Spectrometer(TES),have already been developed internationally.To retrieve valid information from high spectral resolution devices,rapid computation of atmospheric transmittance at higher spectral resolutions is imperative.At the same time,in specialized application fields such as the simulation of high-altitude flying object plumes,reliance on specialized spectral databases like the high-temperature molecular spectroscopic database(HITEMP)becomes essential for high spectral resolution calculations.However,some specialized models addressing these challenges have already been developed abroad,and domestic resources for addressing the above issues are still relatively scarce.In atmospheric radiation transmission calculations,the computation of transmittance presents a significant challenge.Currently,the line-by-line integration method offers the highest calculation accuracy,up to 0.5%,but it is extremely time-consuming.Consequently,calculating absorption coefficients for broader bands imposes numerous practical engineering usage restrictions.In recent years,graphics processing unit(GPU)parallel computing technology has been widely applied in scientific computation.We design a general high-resolution atmospheric spectral line parallel computing model based on GPU,which has increased the computing speed by one to three orders of magnitude.On this basis,combined with the correlated K distribution algorithms,a correlated K distribution coefficient table with a spectral resolution of 1 cm-1 has been constructed,achieving a parameterized representation of line-by-line integration calculation results and enhancing the universality of computational products.Our work endeavors to present a novel technical approach for high-resolution,rapid radiation transmission ca

关 键 词：光学计算 并行处理 逐线积分法 计算统一设备架构 相关K分布 

分 类 号：P409[天文地球—大气科学及气象学]