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What you are experiencing is "cold start" or "start up" mode.
On cold start the idle rpm is raised and the engine runs at a rich fuel mixture. This is partly to get a cold engine running smoothly and partly to heat up the catalysts more quickly. I believe ignition timing also is different in order to enable the rich fuel mixture to burn in the exhaust manifold/catalyst (thus heating the cat).
When cats are heated (or the software in the DME decides), idle and fuel mixture is gradually returned to normal.
Since cold start/startup mode is a special mode, it can't be replicated just by raising the revs to the same level via the throttle pedal.
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