Well, it's time to call it a day here. As ever, we'll have highlights of the match available on the BBC Sport website at midnight. Thanks very much for giving us your attention on a Friday night. I hope you can join our coverage on radio, TV and online over the weekend, with league games galore and the showpiece Scottish League Cup final on Sunday. Good night.
- McDonald opens scoring for Motherwell
- Keeper Long knocks Taylor header into own net
- Rooney scores winner for Dons after mix-up
- Dons close in on leaders Celtic
- Motherwell stay second bottom
Motherwell manager Ian Baraclough
"Talk about a sorry story, but if you don't defend set pieces... You have to have the desire to attack a ball when it comes into the area. It has cost us a game of football. How do you comprehend losing a game like that? You have to learn. We were looking very comfortable at half-time, looking to extend our lead but we have shot ourselves in the foot, not attacking a ball. The performance level has risen in the last few weeks. I'm gutted for them."
Motherwell's Keith Lasley (left) and Josh Law walk off the Pittodrie pitch, contemplating the defeat. They will know that a win for St Mirren away to Kilmarnock on Saturday will leave them bottom of the Premiership.
John Bryson: "Some of the players Baraclough has brought in look good, but neither Laing or Long have impressed."
Aberdeen manager Derek McInnes
"Motherwell were far more aggressive than us. We had worked on a shape to deal with their front two. We changed the shape and in the second half we changed our demeanour, we were much more aggressive. We thoroughly deserved the win in the end. We did it the hard way. Motherwell were excellent in the first half. We showed why we are where we are in the league in the second half. That could be the best three points of the season. We always felt it would be a tough night."
BBC Scotland football pundit Willie Miller
"In the second half you were thinking Aberdeen would be tested. But they were gifted two goals in two minutes. The goals were incredible! Ash Taylor given a free header, unchallenged at the back post! The second goal was from a 'nothing' ball down the middle. After they got the two goals they were the superior team, there is no doubt about that. It would have been interesting to see how they would have reacted if they hadn't got those goals."
We should hear shortly from Motherwell manager Ian Baraclough when he speaks to BBC Radio Scotland's Sportsound. They have conceded 54 goals in 29 matches but there were signs in that first half that Well are a team that can play attractive, confident football.
It's a sore one for Motherwell to take. They were worth their half-time lead but two errors in as many minutes allowed Aberdeen to seize the advantage and from then on the visitors rarely threatened the Reds' goal.
In the final minute of added time Adam Rooney takes the ball into the corner and plays it off Josh Law for a corner kick. It's surely all over.
Motherwell sub Dom Thomas is full of verve as he picks the ball up and takes a run at Aberdeen full-back Shay Logan, but the Dons man has had a fine game and coolly dispossesses the attacker before hoofing the ball to safety.
There are four minutes of injury time to be played.
George Long saves the initial headed effort by Ash Taylor, but a second or so later he knocked the bouncing ball into his own net.
Lee Erwin and Scott McDonald have been booked in recent minutes as Motherwell become frustrated.
Aberdeen, being urged forward by the likes of Shay Logan and Niall McGinn, look the more likely team to score in the remaining seven minutes of the match.
Topical Mark Evans: "A bit of comic relief from the motherwell defence tonight. #COYR #bbcscotfootball"
Dave, Carlisle: "Baraclough needs time. He inherited the worst squad in my 50 years watching Well. McCall took his eye off the ball. We need to finish 10th. Hibs will do us in the play offs."
BBC Scotland football pundit Craig Paterson
"When it's self-inflicted it hurts you. The quality of defending at the two goals was way below the standard required by the manager at this stage of the season."
Aberdeen boss Derek McInnes will be a happier man now that his team have scored twice in the second half.
Niall McGinn goes on a mazy run from the halfway line and, as the white-shirted Well players back off, he makes it to 25 yards from goal and unleashes a left-foot shot that he tugs a shade to the left of the target.
What contrasting emotions for these two players as Adam Rooney nicks in to pounce on Louis Laing's mix-up with the Motherwell goalkeeper.
Tom and 20 others, sent earlier: "Motherwell need to start the 2nd half how they ended the 1st, and not concede any soft..... oh dear #bbcscotfootball"
Ivan in Dunoon: "24 goals for Rooney for the Dons, need a win tonight for the dandy dons, we can believe."
Aberdeen striker David Goodwillie glances in anger at the pitch, perhaps looking for a wayward hedgehog, as he balloons a shot high and wide of the target from the edge of the box - the ball took a horrible bobble off the surface just as he swept his foot through it.
That was Adam Rooney's 24th goal of the season, and probably his simplest finish.
The bulk of the 13,267 inside Pittodrie will be in a good mood now. They'll certainly have enjoyed the bit of skill shown by Niall McGinn as he controls the ball and sends an inviting cross into the box - no takers in red shirts, though.
Dave Dewsbury: "After last week's failure to stand up for a save, bring back Dan Twardzik, he's saved the 'Well from many a thumping, print and be damned."
The unmarked Ash Taylor powers a header at the Well goal - his effort was saved but inadvertently punched into the net by George Long.
What a turnaround in this match. Motherwell manager Ian Baraclough will be watching this slack-jawed. His half-time team talk must surely have included the words "don't give anything away at the start of the second half".
It's a stinker of a goal for Motherwell to lose as keeper George Long comes out of his goal - unnecessarily, I'd suggest - and watches in horror as Louis Laing heads the ball past him at the edge of the box. In races Adam Rooney to capitalise on the mix-up and he taps the ball into the empty net.
Aberdeen make the perfect start to the second half as Ash Taylor is completely unmarked to head at the Motherwell goal from eight yards. George Long makes a good save but, with the ball bouncing a yard from goal, he punches it into his own net instead of clutching it.
Ah, the magic of football under the floodlights. It makes you play better, right?
Thankfully, Motherwell appear and we have a second instalment of Friday night football.
No sign of Motherwell re-emerging yet, despite 15 minutes having elapsed.
Scott McDonald celebrates scoring the opener at Pittodrie, as he nicked ahead of his marker to poke Lee Erwin's shot into the Aberdeen net.
Andrew Priestley: "After the heavy defeat to Celtic, the wind has gone out of Aberdeen's sails. Their season is in danger of fizzling out. #bbcscotfootball"
A statistic from my colleague Brian McLauchlin - Aberdeen have beaten Motherwell only once in the Steelmen's last 10 visits to Pittodrie and that was in October last year.
BBC Scotland football pundit Craig Paterson
"(Motherwell manager) Ian Baraclough needs exactly the same 45. Sometimes when you're 1-0 up at half-time you start to think negatively. The strength of the Motherwell performance was the retention of the ball. Everybody looked on the top of their game. It gives them something to defend. Aberdeen have huffed and puffed but they never really looked like knocking down the Steelmen's rearguard."
As things stands, Well's rivals in the relegation fight - Ross County and St Mirren - will be groaning at the scoreline.
Aberdeen make half-hearted claims for a penalty as Niall McGinn goes in with a raised foot to tackle Motherwell's Anthony Straker. The ref awards a free-kick to the visitors, correctly.