EAST RUTHERFORD, N.J. — It may qualify as a small irony that in the run-up to the first outdoor, cold-weather Super Bowl, the people seemingly least threatened about the possibility of bad weather are the folks whose job is to protect the surface on which the game will be played. It should come as no surprise, since the NFL's groundskeeping experts are used to dealing with the elements — and improvising when they have to. Like the time when rehearsals the night before one Super Bowl put foot-deep indentations into the NFL logo at midfield, necessitating an emergency trip to a local high school field where crews dug up chunks of sod as a replacement.