The authors have reasonably well addressed the comments of the two anonymous referees and they have modified their manuscript accordingly. However, the comments given below should be addressed and several alterations are needed for the Main text and Supplement before the manuscript can be published in ACP.

For the Main text:
Line 19: Replace "the snapshot" by "our snapshot".
Line 20: Replace "to the mean" by "to a mean".
Line 21: Replace "closer to" by "close to".
Line 29: Replace "discussed the" by "discuss the".
Line 51-54: Although SOA from the photo-oxidation of isoprene produced by phytoplankton blooms has been proposed as a potentially important marine SOA source by Meskhidze and Nenes (2006), a study by Claeys et al. (Chemical characterisation of marine aerosol at Amsterdam Island during the austral summer of 2006-2007, J. Aerosol Sci. 41 (2010) 13-22) found no evidence for isoprene SOA at that remote site. On the other hand, Gantt, Meskhidze, and Kamykowski (A new physically-based quantification of marine isoprene and primary organic aerosol emissions, Atmos. Chem. Phys. 9 (2009) 4915-4927) state "Using a fixed 3% mass yield for the conversion of isoprene to SOA, our emission simulations show minor (<0.2%) contribution of marine isoprene to the total marine source of OC on a global scale. However, our model calculations also indicate that over the tropical oceanic regions (30◦S to 30◦N), marine isoprene SOA may contribute over 30% of the total monthly-averaged sub-micron OC fraction of marine aerosol. The estimated contribution of marine isoprene SOA to hourly-averaged sub-micron marine OC emission is even higher, approaching 50% over the vast regions of the oceans during the midday hours when isoprene emissions are highest". This is in contrast with the study by Arnold et al. (Evaluation of the global oceanic isoprene source and its impacts on marine organic carbon aerosol, Atmos. Chem. Phys. 9 (2009) 1253-1262), where it is stated "Inclusion of secondary organic aerosol (SOA) production from oceanic isoprene in the model with a 2% yield produces small contributions (0.01-1.4%) to observed organic carbon (OC) aerosol mass at three remote marine sites in the Northern and Southern Hemispheres. Based on these findings we suggest an insignificant role for isoprene in modulating remote marine aerosol abundances, giving further support to a recently postulated primary OC source in the remote marine atmosphere". Note also that the study of Claeys et al. (2004) does not deal with marine isoprene SOA, but instead with isoprene SOA from the Amazon Basin. Using "marine AND SOA AND isoprene" as topic on the Web of Science I receive 47 hits. Therefore, the sentence here should be rewritten and appropriate references should be given. It is in any case clear that isoprene emissions from the continents are much more important than those from the oceans, as appears from the paper by Guenther et al. (A global model of natural volatile organic compound emissions, J. Geophys. Res. 100 (1995) 8873-8892), so that the importance of marine isoprene SOA should be downplayed.
Line 56: Replace "future warming climate in the future" by "future warming climate".
Line 61: See what I wrote above about marine isoprene SOA; its importance should be downplayed.
Line 66: Replace "emissions fluxes" by "emission fluxes".
Line 68: Replace "air etc." by "air, etc.".
Line 71: Replace "Sharma," by "Sharma et al.,".
Line 74: I do not understand the use of "revere" here; should it perhaps be "reverse" instead of "revere"?
Line 75: Replace "Update observations" by "Updated observations".
Line 77: Replace "we analyzed the" by "we determined the".
Line 119: Replace "run every" by "ran every".
Line 132: Replace "under the controlled" by "under controlled".
Line 142: Replace "the smaller difference among the means" by "the small difference among the mean".
Line 156: Replace "suggested that" by "suggest that".
Line 170: Replace "indicated a" by "indicate a".
Line 175: Replace "traceries and" by "trajectories and".
Line 197: Replace "differences were found" by "difference was found".
Line 198: Replace "limited samples" by "limited number of samples".
Line 199: Replace "emissions sources" by "emission sources".
Lines 230 and 233: I presume that it should be "SOAI" instead of "SOA".
Page 9, Figure 3, right panel: Replace "SOA Traces" by "SOA Tracers".
Lines 240, 260, 408, 418, 420 and 436: It is unclear what "ECS" denotes; I presume that it stands for "East China Sea". In any case, abbreviations and acronyms should be defined (written full-out) when first used. Also, I think that "ECS" in two of these cases (i.e., in lines 240 and 436) should be replaced by "YBS".
Line 248: Replace "atmospheres (Gordon" by "atmosphere (Gordon".
Line 266: Replace "confirm" by "confirm this".
Line 276: Replace "remains unexplained" by "remain unexplained".
Line 289: Replace "decrease down" by "decreases down".
Line 292: Replace "differences were observed" by "difference was observed".
Line 300: Replace "other two" by "the other two".
Line 301: "Li et al., 2013" is missing in the Reference list; there is "Li et al., 2014" in that list to which not is referred within the text.
Line 339: Replace "MTLs observations" by "MTLs observation".
Line 342: Replace "indicated these" by "indicates these".
Line 425: Replace "this SOC compounds" by "these SOC compounds".
Line 428: Replace "heterogonous reactions" by "heterogeneous reactions".
Line 441: Replace "found that a" by "found a".
Lines 728-729: There is no reference made to "Zhu et al., 2016b" within the text.

For the Supplement:
Page 2, lines 1, 2, and 11: Replace "analyzed" by "measured".
Page 2, line 12: It is unclear what is meant by "both analyses".
Page 6, line 2: Replace "up panel" by "upper panel" and replace "below panel" by "lower panel".
Page 7, line 2: Replace "up panel" by "upper panel".
Page 7, line 3: Replace "below panel" by "lower panel".
Page 8, line 2: Replace "analyzed" by "measured".
Page 9, line 1: Replace "primary, secondary" by "primary and secondary".
Page 9, line 2: Replace "gaactosan" by "galactosan".

The following alterations are needed for the Main text and Supplement before the manuscript can be published in ACP.

For the Main text:
Lines 56-57: Replace "estimated the contribution of marine isoprene-derived SOA to the OC in marine atmospheric particles ranged from <0.2% on a global scale, but to as high as 50% (sub-micron OC) over the vast" by "estimated that the contribution of marine isoprene-derived SOA to the OC in marine atmospheric particles is <0.2% on a global scale, but that the hourly-averaged sub-micron OC emission may approach 50% over vast".
Line 108: Replace "analyzed in" by "measured in".
Line 132: Replace "were analyzed" by "were measured".

For the Supplement:
Page 2, line 1: Replace "analyzed in" by "measured in".
Page 2, line 11: Replace "were analyzed" by "were measured".
Page 2, line 14: Replace "was analyzed" by "was measured".