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We study the evolution and final dispersal of protoplanetary discs thatevolve under the action of internal and external photoevaporation, anddifferent degrees of viscous transport. We identify five distinct dispersalpathways, which are i) very long lived discs ($>20\,$Myr), ii) inside-outdispersal where internal photoevaporation dominates and opens inner holes, iii)outside-in dispersal where external photoevaporation dominates through disctruncation and two intermediate regimes characterised by lingering material inthe inner disc with the outer disc dispersed predominantly by either internalor external photoevaporation. We determine how the lifetime, relative impact ofinternal and external winds and clearing pathway varies over a wide, plausible,parameter space of stellar/disc/radiation properties. There are a number ofimplications, for example in high UV environments because the outer disclifetime is shorter than the time-scale for clearing the inner disc we do notexpect transition discs to be common, which appears to be reflected in thelocation of transition disc populations towards the Orion Nebular Cluster.Irrespective of environment, we find that ongoing star formation is required toreproduce observed disc fractions as a function of stellar cluster age. Thiswork demonstrates the importance of including both internal and external windsfor understanding protoplanetary disc evolution.

Dispersal of protoplanetary discs: How stellar properties and the local environment determine the pathway of evolution