To find the new position of the submarine after it ascends 200 feet, you can start with its current depth of -650 feet (since depth below sea level is represented as a negative value).
When the submarine ascends 200 feet, you add 200 to its current position:
\[ -650 + 200 = -450 \]
Thus, the integer that represents its new position is -450 feet, which means it is now 450 feet below sea level.