|The manuscript 'Lower-stratospheric aerosol measurements in eastward shedding vortices over Japan from the Asian summer monsoon anticyclone during the summer of 2018' by Fujiwara et al., is ready for publication after revising the following comments: |
1) P2/L51: ’The enhanced aerosol particle signature in the ASM anticyclone at 14–18 km altitude is known as the Asian Tropopause Aerosol Layer (ATAL), which is believed to consist of carbonaceous and sulphate materials, mineral dust, and nitrate particles (Vernier et al., 2015, 2018; Brunamonti et al., 2018; Bossolasco et al., 2020; Hanumanthu et al., 2020).'
I still recommend to revise this sentence to better make clear which information is from measurements and which from model simulations (e.g. as follows):
The enhanced aerosol particle signature in the ASM anticyclone at 14–18 km altitude found in satellite as well as in in situ balloon-borne measurements is known as the Asian Tropopause Aerosol Layer (ATAL) (e.g. Vernier et al., 2015, 2018; Brunamonti et al., 2018; Hanumanthu et al., 2020). Based on model simulations ATAL is believed to consist of carbonaceous and sulphate materials,
mineral dust, and nitrate particles (e.g. Fadnavis et al., 2013; Gu et al.,2016; Lau et al., 2018; Fairlie et al., 2020; Bossolasco et al., 2020;...). However, only limited information on the chemical composition of the ATAL particles is available from measurements (e.g. Martinsson et al., 2014; Vernier et al., 2018; Höpfner et al., 2019;....).
I just mentioned a few references. Feel free to add some other references or select some other references. I propose to better check the current status of publications to the issue of chemical composition of ATAL.
Fadnavis, S., Semeniuk, K., Pozzoli, L., Schultz, M. G., Ghude, S. D., Das, S., and Kakatkar, R.: Transport of aerosols into the UTLS and their impact on the Asian monsoon region as seen in a global model simulation, Atmos. Chem. Phys., 13, 8771–8786, https://doi.org/10.5194/acp-13-8771-2013, 2013.
Martinsson, B. G., Friberg, J., Andersson, S. M., Weigelt, A., Hermann, M., Assmann, D., Voigtländer, J., Brenninkmeijer, C. A. M., van Velthoven, P. J. F., and Zahn, A.: Comparison between CARIBIC Aerosol Samples Analysed by Accelerator-
Based Methods and Optical Particle Counter Measurements, Atmos. Meas. Tech., 7, 2581–2596,
Gu, Y., Liao, H., and Bian, J.: Summertime nitrate aerosol in the upper troposphere and lower stratosphere over the Tibetan Plateau and the South Asian summer monsoon region, Atmos. Chem. Phys., 16, 6641–6663, https://doi.org/10.5194/acp-16-6641-2016, 2016.
Lau, W. K. M., Yuan, C., and Li, Z.: Origin, Maintenance and Variability of the Asian Tropopause Aerosol Layer (ATAL): The Roles of Monsoon Dynamics, Sci. Rep., 8, 3960,
Fairlie, T. D., Liu, H., Vernier, J.-P., Campuzano-Jost, P., Jimenez, J. L., Jo, D. S., Zhang, B., Natarajan, M., Avery, M. A., and Huey, G.: Estimates of Regional Source Contributions to the Asian Tropopause Aerosol Layer Using a Chemical Transport Model, J. Geophys. Res., 125, e2019JD031506,
'However, it should be noted that the lidar BSR and PDR measurements cannot exclude the possibility of co-existence of other types of solid aerosol particles such as mineral dust, black carbon, and some types of carbonaceous aerosols which are solid.'
Please add here some references for publications that propose that ATAL could consist of solid aerosol particles such as mineral dust, black carbon, and some types of carbonaceous aerosols which are solid. It would be an added value for the paper to know if these references are based on simulations or measurements of ATAL.