We thank the reviewers for their comments. Based on their feedback, we have significantly revised the manuscript. Most notably, we have updated our mixed-layer model to include hydrometeor-vapor isotopic exchange, which resolves the physical discrepancies noted by Reviewer 2. We have also refined our statistical analysis to use standardized regression coefficients as suggested by Reviewer 1, and corrected the citation errors. These changes have strengthened the physical interpretation of the results.  Our detailed responses are attached as a PDF.