A multi-year methane inversion using SCIAMACHY, accounting for systematic errors using TCCON measurements
A multi-year methane inversion using SCIAMACHY, accounting for systematic errors using TCCON measurements
复制标题
使用 SCIAMACHY 进行多年甲烷反演，使用 TCCON 测量来解释系统误差
DOI：
10.5194/acp-14-3991-2014
复制
发表时间：
2013
影响因子：
6.3
通讯作者：
I. Aben
中科院分区：
文献类型：
--
作者：
S. Houweling;M. Krol;P. Bergamaschi;C. Frankenberg;E. Dlugokencky;I. Morino;J. Notholt;V. Sherlock;D. Wunch;V. Beck;C. Gerbig;Huilin Chen;E. Kort;T. Röckmann;I. Aben
抽象的。这项研究调查了使用SCIAMACHY卫星仪器的总CH4(XCH4)柱来量化大规模甲烷排放的情况。SCIAMACHY提供了一个独特的数据集，跨越了近十年的测量，涵盖了全球甲烷增长率从稳定到不断增加的显著过渡时期。TM5 4DVAR逆向模拟系统已用于推算2003-2010年期间卫星和地面测量的CH4排放量。与早先的逆模型研究不同，SCIAMACHY反演已使用地面傅里叶变换光谱仪的TCCON网络进行了系统误差校正。其目的是进一步研究卫星数据的偏差改正在反演中的作用。讨论了偏置校正的方法，并量化了优化排放对不同偏置校正函数的灵敏度。结果发现，在TM5 4DVAR中使用SCIAMACHY反演，与仅使用地面观测相比，大尺度通量的估计年际变率增加了22%。2006年7月前后两年期间全球甲烷排放量的差异估计为27-35tg/年−1。使用SCIAMACHY反演导致50±25tg/年−1的排放从热带向热带转移。该值的较大不确定性源于偏差修正函数的不确定性。使用河马和巴萨飞机战役的测量，我们表明SCIAMACHY测量中的系统误差是限制反演性能的主要因素。为了利用当前和未来的卫星飞行任务进一步限制热带甲烷排放，在热带地区扩大验证能力至关重要。
Abstract. This study investigates the use of total column CH4 (XCH4) retrievals from the SCIAMACHY satellite instrument for quantifying large-scale emissions of methane. A unique data set from SCIAMACHY is available spanning almost a decade of measurements, covering a period when the global CH4 growth rate showed a marked transition from stable to increasing mixing ratios. The TM5 4DVAR inverse modelling system has been used to infer CH4 emissions from a combination of satellite and surface measurements for the period 2003–2010. In contrast to earlier inverse modelling studies, the SCIAMACHY retrievals have been corrected for systematic errors using the TCCON network of ground-based Fourier transform spectrometers. The aim is to further investigate the role of bias correction of satellite data in inversions. Methods for bias correction are discussed, and the sensitivity of the optimized emissions to alternative bias correction functions is quantified. It is found that the use of SCIAMACHY retrievals in TM5 4DVAR increases the estimated inter-annual variability of large-scale fluxes by 22% compared with the use of only surface observations. The difference in global methane emissions between 2-year periods before and after July 2006 is estimated at 27–35 Tg yr−1. The use of SCIAMACHY retrievals causes a shift in the emissions from the extra-tropics to the tropics of 50 ± 25 Tg yr−1. The large uncertainty in this value arises from the uncertainty in the bias correction functions. Using measurements from the HIPPO and BARCA aircraft campaigns, we show that systematic errors in the SCIAMACHY measurements are a main factor limiting the performance of the inversions. To further constrain tropical emissions of methane using current and future satellite missions, extended validation capabilities in the tropics are of critical importance.
影响因子：
6.3
作者：
Fraser, A.;Palmer, P. I.;Weiss, R. F.
通讯作者：
Weiss, R. F.
影响因子：
5.2
作者：
Guerlet, S.;Basu, S.;Aben, I.
通讯作者：
Aben, I.