This is a very interesting proxy development based on grape production. So far, grape harvest dates (ghd) are well-known proxies of past temperatures from April to July that can generate very accurate and fascinating time series (see Labbé et al. 2019, https://doi.org/10.5194/cp-15-1485-2019). However, the analysis of wine must has not yet been considered, although the present manuscript shows that it is a highly potential climate proxy when other related information is missing. This study opens the door to exciting future studies

The article by Darrell Kaufman and Valérie Masson-Delmotte provides a useful Opinion piece on the inclusion of paleoscience in the upcoming IPCC AR7.

This paper is an excellent example of how sophisticated climate reconstructions can be made on the basis of historical documentary data. The authors have not only succeeded in analysing the rich historical descriptions in a very valuable way, they have also applied various statistical approaches very skillfully in a remarkably interdisciplinary approach. The article stands out for its deep understanding of historical sources, drought processes, and various social processes.

The paper entitled "Continuous synchronization of the Greenland ice-core and U-Th timescales using probabilistic inversion" presents a first and new continuously measured transfer function that quantifies the age difference between the GICC05 and the U-Th timescale during the last ice age. The transfer function was estimated using a new automated algorithm for proxy data alignment. The approach was the subject of much discussion with the various referees who evaluated it, but it is at least described clearly enough for the community to form its own opinion and henceforth use it.

This study presents an interesting attempt to reconstruct global surface temperature by combining sparse SST proxy data and PlioMIP2 simulations using a state-of-the-art data assimilation framework. The work highlights the potential of this method for providing key insights into past warming patterns, and will serve as a good starting point for future investigations.

Romero et al. mapped geomorphological features on the landscape and dated moraine boulders and outwash sediments to constrain past changes of the former Patagonian Ice Sheet in southern Argentina. They show that the Lago Argentino glacier expanded during Marine Isotope Stage 6 (153.0±14.7 ka) and during Marine Isotope Stage 3, culminating at 44.5±8.0 ka and at 36.6±1.0 ka, thus preceding the Last Glacial Maximum. They hypothesize that this was a result of longer and colder winters, as well as increased precipitation resulting from an equatorward shift of the Southern Hemisphere Westerlies.

The Atlantic Meridional Overturning Circulation (AMOC) is at its weakest of the last millennium and is projected to further weaken over the coming decades, with the risk of a collapse over the coming century non negligible. The geologic record provides examples of rapid and large AMOC variations, with phases of AMOC weakening, preceding an AMOC shutdown. One key question is whether CO2-driven AMOC weakening is reversible, or whether it represents a tipping point, which might lead to an AMOC collapse. The study by Willeit et al. offers a new diagnostic that is simple to implement and allows for comparing AMOC stability between different models, as well as different time periods. This offers a powerful new tool in understanding the conditions for AMOC stability, and thus the AMOC future.

This manuscript deserves to be highlighted as it presents an incredible dataset, analysed using state-of-the-art techniques and summarised in a clear and readable form. As the reviewers pointed out, the content could easily have resulted in two articles (or even more...) - a practice that is sometimes done to increase ‘academic output’. However, the authors have chosen to provide a comprehensive overview and interpretation of the results. In addition, the site studied is of great importance for Icelandic studies of Holocene climate change.