One of major conclusion of this manuscript is the organic species deposited in Lampedusa coming from natural sources (sea spray and dust), notably in summer. However, your discussion is supported by a too limited literature about OM sources in atmospheric aerosols in this area. One of the reviewers reminded you that you did not consider the potential role played by pollen. It is also surprising that your discussion does not take into account the presence of atmospheric secondary organic aerosols as a source of organic matter at Lampedusa in spring and summer (see Mallet et al., ACP, 2019) but generally in Med Sea (Arndt et al., 2017; Michoud et al., 2017; Rinaldi et al., 2017..). Moreover, it is known that the regional pollution at Lampedusa is higher than presented in your manuscript (e.g. Pace et al. (2006) have shown that clean marine aerosol conditions are rare at Lampedusa, contrary to your sentence p3L81) and a discussion on air masses trajectories is available in Mallet et al., 2019. So please add this information in your corrected version before publication.

Arndt, J., Sciare, J., Mallet, M., Roberts, G. C., Marchand, N., Sartelet, K., Sellegri, K., Dulac, F., Healy, R. M., and Wenger, J. C.: Sources and mixing state of summertime background aerosol in the north-western Mediterranean basin, Atmos. Chem. Phys., 17, 6975–7001, https://doi.org/10.5194/acp-17-6975-2017, 2017.
Mallet, M. D., D'Anna, B., Même, A., Bove, M. C., Cassola, F., Pace, G., Desboeufs, K., Di Biagio, C., Doussin, J.-F., Maille, M., Massabò, D., Sciare, J., Zapf, P., di Sarra, A. G., and Formenti, P.: Summertime surface PM1 aerosol composition and size by source region at the Lampedusa island in the central Mediterranean Sea, Atmos. Chem. Phys., 19, 11123–11142, https://doi.org/10.5194/acp-19-11123-2019, 2019.
Michoud, V., Sciare, J., Sauvage, S., Dusanter, S., Léonardis, T.,Gros, V., Kalogridis, C., Zannoni, N., Féron, A., Petit, J.-E.,Crenn, V., Baisnée, D., Sarda-Estève, R., Bonnaire, N., Marchand,N., DeWitt, H. L., Pey, J., Colomb, A., Gheusi, F., Szidat, S., Stavroulas, I., Borbon, A., and Locoge, N.: Organic carbon at a remote site of the western Mediterranean Basin: sources and chemistry during the ChArMEx SOP2 field experiment, Atmos. Chem. Phys., 17, 8837–8865, https://doi.org/10.5194/acp-17-8837-2017, 2017.
Rinaldi, M., Gilardoni, S., Paglione, M., Sandrini, S., Decesari, S.,Zanca, N., Marinoni, A., Cristofanelli, P., Bonasoni, P., and Ielpo, P.: Physico-chemical characterization of Mediterranean background aerosol at the Capogranitola observatory (Sicily), EGU General Assembly Conference Abstracts, 23–28 April 2017, Vienna, Austria, 3161, 2017.

Dear authors,
The reviewers and handling editor have concluded that your manuscript is of high interest and suitable for publication in Biogeosciences. Based on these recommendations, I am happy to accept publication of your manuscript, provided some minor revisions that might help improving the text (see annotated manuscript).
Kind regards,
Christine Klaas