Task: Question Answering
Input (English): Passage: The sun set over Framheim on 21 April, not to reappear for four months. Amundsen was mindful of the boredom and loss of morale that had blighted the Belgica expedition's winter in the ice, and although there was no possibility of sledging he ensured that the shore party kept busy. One urgent task was to improve the sledges, which had not worked well during the depot journeys. In addition to those chosen specifically for the expedition, Amundsen had brought along several sledges from Sverdrup's 1898–1902 Fram expedition, which he now thought would be better suited to the task ahead.  Bjaaland reduced the weight of these older sledges by almost a third by planing down the timber, and also constructed three sledges of his own from some spare hickory wood. The adapted sledges were to be used to cross the Barrier, while Bjaaland's new set would be used in the final stages of the journey, across the polar plateau itself.  Johansen prepared the sledging rations (42,000 biscuits, 1,320 tins of pemmican and about 220 pounds (100 kg) of chocolate), while other men worked on improving the boots, cooking equipment, goggles, skis and tents. To combat the dangers of scurvy, twice a day the men ate seal meat that had been collected and frozen in quantities before the onset of winter. The cook, Lindstrøm, supplemented the vitamin C intake with bottled cloudberries and blueberries, and provided wholemeal bread made with fresh yeast, rich in B vitamins.While Amundsen was confident in his men and equipment, he was, Hassel recorded, tormented by thoughts of Scott's motor sledges and the fear that these would carry the British party to success. With this in mind Amundsen planned to begin the polar journey as soon as the sun rose in late August, though Johansen warned that it would be too cold on the Barrier so early in the season.  Amundsen overruled him, and at sunrise on 24 August seven sledges were made ready. Johansen's concerns seemed justified, as harsh conditions for the next two weeks—temperatures as low as −58 °C (−72 °F)—prevented the men from leaving. On 8 September 1911, when the temperature rose to −27 °C (−17 °F), Amundsen decided he could wait no longer, and the party of eight set off; Lindstrøm remained alone at Framheim. 
Question: Amundsen overruled who?
Output (English): Johansen.