ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged methane from Sentinel-5P, generated with the WFM-DOAS algorithm, version 1.5, November 2017 - December 2020

This product is the column-average dry-air mole fraction of atmospheric methane, denoted XCH4. It has been retrieved from radiance measurements from the TROPOspheric Monitoring Instrument (TROPOMI) on the Sentinel-5 Precursor satellite in the 2.3 µm spectral range of the solar spectral range, using the Weighting Function Modified Differential Optical Absorption Spectroscopy (WFM-DOAS or WFMD) retrieval algorithm. This dataset is also referred to as CH4_S5P_WFMD. This version of the product is version 1.5, and covers the period from November 2017 - December 2020.

The WFMD algorithm is based on iteratively fitting a simulated radiance spectrum to the measured spectrum using a least-squares method. The algorithm is very fast as it is based on a radiative transfer model based look-up table scheme. The product is limited to cloud-free scenes on the Earth's day side.

These data were produced as part of the European Space Agency's (ESA) Greenhouse Gases (GHG) Climate Change Initiative (CCI) project.

When citing this dataset, please also cite the following peer-reviewed publication:
Schneising, O., Buchwitz, M., Reuter, M., Bovensmann, H., Burrows, J. P., Borsdorff, T., Deutscher, N. M., Feist, D. G., Griffith, D. W. T., Hase, F., Hermans, C., Iraci, L. T., Kivi, R., Landgraf, J., Morino, I., Notholt, J., Petri, C., Pollard, D. F., Roche, S., Shiomi, K., Strong, K., Sussmann, R., Velazco, V. A., Warneke, T., and Wunch, D.: A scientific algorithm to simultaneously retrieve carbon monoxide and methane from TROPOMI onboard Sentinel-5 Precursor, Atmos. Meas. Tech., 12, 6771–6802, https://doi.org/10.5194/amt-12-6771-2019, 2019.

本产品为大气甲烷的柱平均干空气摩尔分数，记作XCH4。该数据源于对Sentinel-5 Precursor卫星上TROPOspheric Monitoring Instrument (TROPOMI)在太阳光谱2.3 µm波段内所测辐射亮度值进行的处理，采用加权函数修正差分光学吸收光谱法（WFM-DOAS或WFMD）检索算法获得。该数据集亦被称为CH4_S5P_WFMD。本产品的版本为1.5，覆盖了2017年11月至2020年12月的时间段。WFMD算法基于迭代拟合模拟辐射亮度光谱至测量光谱，采用最小二乘法进行。该算法因其基于辐射传输模型查找表方案而具有极高的运算速度。产品数据仅限于地球白天无云场景。这些数据是欧洲航天局（ESA）温室气体（GHG）气候变化倡议（CCI）项目的一部分。在引用此数据集时，请同时引用以下同行评审出版物：Schneising, O.，Buchwitz, M.，Reuter, M.，Bovensmann, H.，Burrows, J. P.，Borsdorff, T.，Deutscher, N. M.，Feist, D. G.，Griffith, D. W. T.，Hase, F.，Hermans, C.，Iraci, L. T.，Kivi, R.，Landgraf, J.，Morino, I.，Notholt, J.，Petri, C.，Pollard, D. F.，Roche, S.，Shiomi, K.，Strong, K.，Sussmann, R.，Velazco, V. A.，Warneke, T.，Wunch, D.：A scientific algorithm to simultaneously retrieve carbon monoxide and methane from TROPOMI onboard Sentinel-5 Precursor, Atmos. Meas. Tech., 12, 6771–6802, https://doi.org/10.5194/amt-12-6771-2019, 2019.