![]() ![]() 60: “during the termination of the AHP” to “during the AHP” (1999): UC, and how about the other recent studies? (2006), many studies have already been implemented on this topic, but why do the authors not mention any recent studies? - Liu et al. L.43: “the rate of this transition remains controversial” – The authors would be better to clarify whether these are differences among data or/and discrepancies between data and model. 2020) reproduce global-scale surface temperature and precipitation? 2019) how good do the LIG simulation (Li et al. Not directly related to this study, but compared to the data (e.g., Hoffman et al. (3) It seems that the data already show that the Green Sahara happened in the two periods, but what else do we know from the data, especially about differences? Finally, is there a reason for no quantitative model-data comparison, in particular, the Holocene has been made at all? We cannot decide whether these simulations are good or bad at all. However, it is better to analyse the western and eastern parts of the Sahara separately rather than the whole Sahara. In this study, one of the main analyses is to investigate changes in climate (particularly surface temperature and precipitation) and vegetation cover in the whole Sahara or North Africa, including the Sahel, during the LIG and Holocene. 2020), and data regarding the abruptness of precipitation/vegetation decline is a local- or regional-scale feature (Brovkin and Claussen 2008), not the whole Sahara. For example, the spatial and temporal complexity of the termination of the African Humid Period (AHP) have already known (Shanahan et al. (2) It might be better to describe what is already known in the Introduction section and show more new results in this paper. Alternatively, it would be interesting to have a new fact (not known from the data alone) that can be obtained through the comparison. Therefore, it would be better to have a clear motivation, for example, to obtain clues (regarding vegetation-climate interactions) to modify the Holocene simulation by comparing the two periods. ![]() 2016 Hopcroft and Valdes 2021), but many Paleo-modelling still fails to simulate it (Tierney et al. We understand some studies already modified to simulate Green Sahara reproducing intensification and geographical expansion of the West African monsoon (e.g., Pausata et al. It is not clear why it is necessary to simply compare these two time periods regarding Green Sahara (vegetation-precipitation transition in the Sahara). (1) The authors could do a better job of motivating this study. I am outlining my main concerns below, and the paper can be accepted after moderate revisions if the research questions are pertinent. However, the presentation of the experiments and results is a bit vague/unclear and lacks necessary information in its current manuscript because the authors have written too briefly. I am not sure whether the three questions were appropriate, a research design was developed or not, and a reasonable amount of analysis was conducted to answer them. These two periods have been adopted as the CMIP6/PMIP4 target period, and this study help to understand the role of changes in insolation, one of major forcing agents in the Earth system, as well as climate-vegetation interactions. (2020) that focused on simulated climate-vegetation interactions in North Africa during the LIG. The Holocene simulations (8.5 ka to 1 ka BP) were run for this study, and the LIG simulations were the same as Li et al. This manuscript presents a comparison of the vegetation transition in the Sahara between the Holocene and the Last Interglacial (LIG), using an earth system model of intermediate complexity (iLOVECLIM) in combination with two dynamical vegetation models, VECODE and LPJ-GUESS. ![]()
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