Whether the stratospheric radiative feedback amplifies the global warming remains under debate. The stratospheric water vapor (SWV), one of the primary feedbacks in the stratosphere, is argued to be an important contributor to the global warming. On the other hand, the overall stratospheric feedback, which consists of both the SWV feedback and the stratospheric temperature (ST) feedback, does not amount to a significant value. The key to reconciling these seemingly contradictory arguments is to understand the ST change. Here, we develop a method to decompose the ST change and to quantify the decomposed feedbacks. We find that the SWV feedback, which consists of a 0.04 W m⁻² K⁻¹ direct impact on the top-of-the-atmosphere radiation and 0.11 W m⁻² K⁻¹ indirect impact via ST cooling, is offset by a negative ST feedback of − 0.13 W m⁻² K⁻¹ that is radiatively driven by the tropospheric warming. This compensation results in an insignificant overall stratospheric feedback.

平流层辐射反馈是否会加剧全球变暖尚有争议。平流层水汽（SWV）是平流层的主要反馈之一，被认为是导致全球变暖的重要因素。另一方面，由SWV反馈和平流层温度（ST）反馈组成的整个平流层反馈值并不大。调和这些看似矛盾的论点的关键是理解ST的变化。在这里，我们开发了一种分解ST变化并量化分解后反馈的方法。我们发现，SWV反馈包括对大气顶部辐射的0.04 W m ^-2  K ^-1直接影响和0.11 W m ^-2  K的直接影响通过ST冷却产生的^-1间接冲击被-0.13 W m ^-2  K ^-1的负ST反馈抵消，该负ST反馈由对流层变暖辐射驱动。这种补偿导致平流层总体反馈微不足道。