Not withstanding departure procedures / SIDs / OCLs and OCHs, MSAs or SSAs -
Is there a panacea climb profile which would be the quietest (please don`t say shutdown the engines) - I was on the ground the other day and saw a nice BA flight out of EGLL and s/he flew over it was a 319 or 318 or a 320 - possibly a 318 anyway he was just trickling along - clean and looked nice and slow to my Earthbound eye he looked to be doing about 160 and he was quiet as anything - actually it might have been 180 or 190 but not more.
Would not 1,000 fpm do it with a nominal climb speed like - green dot - like, a speed which would not demand to much coal from the engines?
Why is distance your friend? Is it because you are going further away from the area of noise abatement?
I have seen some quiet climbs and some roaring climbs - they are kind of obvious. One can always tell when somebody is at full bore even at 28,000 feet -especially Tornados and F15s.
From the flightdeck though where everything sounds the same, most of the time, could there be a cool power speed roc combo that keeps it hushed?