A321
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Time Pressure; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft
Clearing [Runway] XXL in ZZZ; a master warning light and bell sounded; with the ECAM; SMOKE AFT CARGO SMOKE. First Officer began the 'Immediate action/ECAM exception' search but the warning disappeared before he could complete it. The same warning sounded for about the same amount of time (5 seconds) right after crossing [Runway] XXC; but also disappeared before action could be taken. It sounded a 3rd time about 300 yards west of  concourse. We stopped; ran the checklist; including discharging the fire suppression agent. The last item on the ECAM action is to not open the cargo door until the pax have deplaned. We called both Ramp and Operations and asked them to relay this information. We then proceeded to the gate; at which time the aft cargo door was immediately opened. Thankfully there was no fire; but if there had been it could obviously have been serious for the baggage handler as well as the aircraft and its occupants.We have no direct means (that I know of) to communicate with the ground crew and tell them not to open a cargo door. Relaying through Ops or Ramp is not a great option when time is critical; as it is when we have fire indications. I have been told that other countries utilize the beacon; turing it off as a signal that it is safe to open the cargo doors. That would have been a very useful tool in this situation.
A-321 Captain reported intermittent ECAM SMOKE AFT CARGO annunciation during taxi at destination airport. Reporter highlighted ramp communication issues upon gate arrival.