who was the first person to land on antarctica
History of Antarctica In 1820, several expeditions claimed to have been the first to have sighted the ice shelf or the continent. A Russian expedition was led by Fabian Gottlieb von Bellingshausen and Mikhail Lazarev, a British expedition was captained by Edward Bransfield and an American sealer Nathaniel Palmer participated. The first landing was probably just over a year later when American Captain John Davis, a sealer, set foot on the ice.
Antarctic ice sheet The icing of Antarctica began in the middle Eocene about 45.5 million years ago[6] and escalated during the Eocene–Oligocene extinction event about 34 million years ago. CO2 levels were then about 760 ppm[7] and had been decreasing from earlier levels in the thousands of ppm. Carbon dioxide decrease, with a tipping point of 600 ppm, was the primary agent forcing Antarctic glaciation.[8] The glaciation was favored by an interval when the Earth's orbit favored cool summers but oxygen isotope ratio cycle marker changes were too large to be explained by Antarctic ice-sheet growth alone indicating an ice age of some size.[9] The opening of the Drake Passage may have played a role as well[10] though models of the changes suggest declining CO2 levels to have been more important.[11]