Named after Carl G. Rossby - Swedish-American meteorologist (1898-1957).
Rossby Crater is an impact crater in the Eridania quadrangle on Mars at 47.9°S and 192.2°W, and it is 82.5 km in diameter. Pictures show gullies on the wall Crater. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Mars large craters are named after deceased scientists, writers and others who have contributed to the lore of Mars. Small creaters (less than 60km) are named after small towns and villages.