As atmospheric methane concentrations increase at record pace, it is critical to identify individual emission sources with high potential for mitigation. Here, we leverage the synergy between satellite instruments with different spatiotemporal coverage and resolution to detect and quantify emissions from individual landfills. We use the global surveying Tropospheric Monitoring Instrument (TROPOMI) to identify large emission hot spots and then zoom in with high-resolution target-mode observations from the GHGSat instrument suite to identify the responsible facilities and characterize their emissions. Using this approach, we detect and analyze strongly emitting landfills (3 to 29 t hour −1 ) in Buenos Aires, Delhi, Lahore, and Mumbai. Using TROPOMI data in an inversion, we find that city-level emissions are 1.4 to 2.6 times larger than reported in commonly used emission inventories and that the landfills contribute 6 to 50% of those emissions. Our work demonstrates how complementary satellites enable global detection, identification, and monitoring of methane superemitters at the facility level.

中文翻译：

---

使用卫星发现垃圾填埋场的大量甲烷排放

随着大气甲烷浓度以创纪录的速度增加，确定具有高缓解潜力的单个排放源至关重要。在这里，我们利用具有不同时空覆盖和分辨率的卫星仪器之间的协同作用来检测和量化单个垃圾填埋场的排放。我们使用全球测量对流层监测仪器 (TROPOMI) 来识别大型排放热点，然后放大来自 GHGSat 仪器套件的高分辨率目标模式观测，以识别负责任的设施并表征其排放。使用这种方法，我们检测和分析强烈排放的垃圾填埋场（3 到 29 小时-1) 在布宜诺斯艾利斯、德里、拉合尔和孟买。在反演中使用 TROPOMI 数据，我们发现城市层面的排放量是常用排放清单中报告的 1.4 到 2.6 倍，垃圾填埋场占这些排放量的 6% 到 50%。我们的工作展示了互补卫星如何在设施层面实现对甲烷超排放物的全球检测、识别和监测。