Coupling Bertoin's and Aldous-Pitman's representations of the additive coalescent

We construct a coupling between two seemingly very di erent constructions of the standard additive coalescent, which describes the evolution of masses merging pairwise at rates proportional to their sums. The rst construction, due to Aldous & Pitman, involves the components obtained by logging the Brownian Continuum Random Tree (CRT) by a Poissonian rain on its skeleton as time increases. The second one, due to Bertoin, involves the excursions above its running in mum of a linear-drifted standard Brownian excursion as its drift decreases. Our main tool is the use of an exploration algorithm of the so-called cut-tree of the Brownian CRT, which is a tree that encodes the genealogy of the fragmentation of the CRT