Atmospheric Chemistry and Physics Discussions Interactive comment on “Adjoint backtracking for the verification of the Comprehensive Test Ban

General comments This paper is motivated by the need to derive statements about possible or probable source locations for anomalous radionuclide measurements that may be observed in the global radionuclide measurement network which is under construction for the verifi-cation of the Comprehensive Nuclear-Test-Ban Treaty. It introduces the adjoint of a Eu-lerian transport and diffusion model as a tool to calculate source-receptor matrices (my wording) for these observations in Section 2. Sections 3-5 refer to an event encoun-tered during test measurements at one single station and present methods of various complexity for drawing conclusions on the source based on these measurements (i