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Abstract. We investigate the response of stratospheric water vapor(SWV) to different forcing agents within the Precipitation Driver andResponse Model Intercomparison Project (PDRMIP) framework. For each modeland forcing agent, we break down the SWV response into a slow response, which iscoupled to surface temperature changes, and a fast response, which is theresponse to external forcing but before the sea surface temperatures haveresponded. Our results show that, for most climate perturbations, the slowSWV response dominates the fast response. The slow SWV response exhibits asimilar sensitivity to surface temperature across all climate perturbations.Specifically, the sensitivity is 0.35 ppmv K−1 in the tropical lowerstratosphere (TLS), 2.1 ppmv K−1 in the northern hemispheric lowermoststratosphere (LMS), and 0.97 ppmv K−1 in the southern hemispheric LMS.In the TLS, the fast SWV response only dominates the slow SWV response whenthe forcing agent radiatively heats the cold-point region – for example,black carbon, which directly heats the atmosphere by absorbing solarradiation. The fast SWV response in the TLS is primarily controlled by thefast adjustment of cold-point temperature across all climate perturbations.This control becomes weaker at higher altitudes in the tropics and altitudesbelow 150 hPa in the LMS.

The response of stratospheric water vapor to climate change driven by different forcing agents