Dear authors,
The paper under discussion received good and excellent ratings by the reviewers and it has been further improved by the applied revisions. Therefore, I am pleased to accept the revised manuscript for publication in ACP. A few minor technical corrections may help to further clarify the description of the steady-state model used to estimate the atmospheric isoprene concentration.
(1) In the description of the box model, you make the statement '..for a one hour lifetime it takes approximately 10 hours to achieve steady state'. If the boundary conditions (emission rate, boundary-layer height, isoprene lifetime) are kept constant, I would expect that the steady state is reached in 2-3 hours. Please check.
(2) If I understand the description correctly, the atmospheric steady-state isoprene concentration Ca is simply given by the equation: Ca = (kAS*Cw)*tau/h, where tau is the atmospheric lifetime of isoprene and h is the marine boundary-layer height. It would be helpful for the reader to include the equation, which you have used, into Paragraph 4.
Best regards,
Andreas Hofzumahaus
Co-editor ACP