The Boston Red Sox made the Cody Ross signing official today. In order to make room for him on the 40-man roster, they designated reliever Scott Atchison for assignment.

Here’s the release from the Red Sox:

BOSTON, MA—The Boston Red Sox today signed outfielder Cody Ross to a one-year contract for the 2012 season.  No further terms were disclosed.  To make room for Ross on the 40-man roster, the Red Sox designated right-handed pitcher Scott Atchison for assignment.

Boston Red SoxThe announcement was made by Executive Vice President/General Manager Ben Cherington.

Ross played in 121 games for the Giants in 2011, including 107 starts, and appeared at all three outfield positions.  The 31-year-old knocked 14 home runs, his sixth straight season with double-digit homers, and hit .240 (97-for-405) last year with 25 doubles, 52 RBI and 54 runs, and led the Giants with a career-high 49 walks.  He made just one error in 192 total chances in the field and tallied eight assists.  A right-handed batter, he hit at a .309 clip (17-for-55) with four home runs and 10 RBI in 13 games in September.

Selected by Detroit in the fourth round of the 1999 First-Year Player Draft, Ross has played in 757 Major League games over eight seasons with the Tigers (2003), Dodgers (2005-06), Reds (2006), Marlins (2006-10) and Giants (2010-11).  He has a .261 career average (636-for-2,436) with 152 doubles, 11 triples, 100 home runs, 371 RBI, 328 runs, 197 walks and 28 stolen bases.  Ross has hit at a .282 clip (193-for-684) off left-handed pitching and is posting a .563 slugging percentage against southpaws in his career, the seventh-best mark in the Majors since 2003.  He earned MVP honors for the National League Championship Series in 2010 after batting .350 (7-for-20) with three home runs and five RBI, and hit .294 (15-for-51) with five home runs and 10 RBI in 15 games overall that postseason to help the Giants to a World Series title.

The 35-year-old Atchison made 17 appearances over six stints with the Red Sox in 2011, posting a 1-0 record with a 3.26 ERA (11 ER/30.1 IP) and his first Major League save.  He also pitched in 36 games with Triple-A Pawtucket, including one start, going 6-2 with five saves, a 2.64 ERA (18 ER/61.1 IP), 72 strikeouts and nine walks.  Signed by the Red Sox as a free agent on December 2, 2009, the right-hander has appeared in 113 career Major League games (one start) over parts of five seasons with the Mariners (2004-05), Giants (2007) and Red Sox (2010-11), tallying a 4.09 ERA (72 ER/158.1 IP) and 128 strikeouts while going 5-6 with one save