The information in spectroscopic databases is routinely updated, therefore it is necessary to evaluate on a regular basis how efficient the improvements in spectroscopic data are with respect to the atmospheric remote sensing problems. One of such problems is the methane total column retrieval from the ground-based FTIR measurements of the direct solar radiation. The CH₄ line parameters contained in various modern spectroscopic databases demonstrate some differences. In the present study, the impact of these differences on the atmospheric methane retrievals is estimated. The ground-based FTIR measurements at the St.Petersburg and Kourovka observational stations (Russian Federation) are taken as the basis for the study. The retrieval algorithms conform to the specifications worked out by the IRWG NDACC and TCCON networks. The databases HITRAN2001, HITRAN2008, HITRAN2012, HITRAN2016, GEISA, ATM12, ATM16, ATM19 and the GOSAT2014 line list are used as the input for the forward modeling and for the retrievals of the CH₄ total column. Different criteria for quality assessment of fitting of measured and simulated transmittance spectra are considered. It has been shown that the variability of the methane total column values retrieved using absorption line parameters from different spectroscopic databases reaches 1.7%. The obtained results confirmed that for mid-infrared range the current IRWG NDACC recommendation to use HITRAN2001 is still valid: the HITRAN2001 data provide better CH₄ retrievals than the newer spectroscopic databases, with the exception of one database (ATM19) yielding slightly different results but comparable to HITRAN2001. The best retrieval results in the near-infrared region are observed when the ATM, HITRAN2008 and GEISA2011 databases are used. The lowest value of RMS corresponded to the calculations which used the ATM19 line list.

光谱数据库中的信息会定期更新，因此有必要定期评估光谱数据相对于大气遥感问题的效率如何。这些问题之一是从直接太阳辐射的地面FTIR测量中提取甲烷总塔数。CH ₄各种现代光谱数据库中包含的线性参数显示出一些差异。在本研究中，估计了这些差异对大气甲烷回收的影响。圣彼得堡和Kourovka观测站（俄罗斯联邦）的地面FTIR测量被用作研究的基础。检索算法符合IRWG NDACC和TCCON网络制定的规范。数据库HITRAN2001，HITRAN2008，HITRAN2012，HITRAN2016，GEISA，ATM12，ATM16，ATM19和GOSAT2014行列表用作正向建模和CH ₄检索的输入总栏。考虑了测量和模拟透射光谱拟合的质量评估的不同标准。已经显示，使用吸收光谱参数从不同光谱数据库中检索到的甲烷总塔值的变异性达到1.7％。获得的结果证实，对于中红外范围，当前IRWG NDACC建议使用HITRAN2001仍然有效：HITRAN2001数据提供了更好的CH ₄与较新的光谱数据库进行检索相比，只有一个数据库（ATM19）产生的结果略有不同，但与HITRAN2001相当。当使用ATM，HITRAN2008和GEISA2011数据库时，可以观察到近红外区域的最佳检索结果。RMS的最小值对应于使用ATM19线路列表的计算。