Recently, it was recognized that widely used calculations of methane radiative forcing systematically underestimated its global value by 15% by omitting its shortwave effects. We show that shortwave forcing by methane can be accurately calculated despite considerable uncertainty and large gaps in its shortwave spectroscopy. We demonstrate that the forcing is insensitive, even when confronted with much more complete methane absorption spectra extending to violet light wavelengths derived from observations of methane-rich Jovian planets. We undertake the first spatially resolved global calculations of this forcing and find that it is dependent on bright surface features and clouds. Localized annual mean forcing from preindustrial to present-day methane increases approaches +0.25 W/m², 10 times the global annualized shortwave forcing and 43% of the total direct CH₄ forcing. Shortwave forcing by anthropogenic methane is sufficiently large and accurate to warrant its inclusion in historical analyses, projections, and mitigation strategies for climate change.

中文翻译：

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人为甲烷的大型区域性短波强迫，由Jovian观测得知。

最近，人们认识到，广泛使用的甲烷辐射强迫计算方法通过忽略其短波效应而将其全球价值低估了15％。我们显示，尽管在短波光谱学中存在很大的不确定性和较大的差距，但由甲烷引起的短波强迫仍可准确计算。我们证明了这种强迫是不敏感的，即使面对更完整的甲烷吸收光谱也延伸到紫罗兰色的光波时，紫罗兰色的波长是从富含甲烷的木星行星的观测中得出的。我们对该力进行了首次空间解析的全局计算，并发现它取决于明亮的表面特征和云。从工业化前到当今甲烷的局部年均强迫值接近+0.25 W / m ²，是全球年化短波强迫的10倍，占总直接CH ₄强迫的43％。人为甲烷造成的短波强迫足够大且准确，足以保证将其纳入历史分析，预测和气候变化缓解策略中。