摘要：Abstract. By considering the moisture transport for precipitation (MTP) for a targetregion to be the moisture that arrives in this region from its major moisturesources and which then results in precipitation in that region, we explore(i) whether the MTP from the main moisture sources for the Arctic region islinked with inter-annual fluctuations in the extent of Arctic sea icesuperimposed on its decline and (ii) the role of extreme MTP events in theinter-daily change in the Arctic sea ice extent (SIE) when extreme MTPsimultaneously arrives from the four main moisture regions that supply it.The results suggest (1) that ice melting at the scale of inter-annualfluctuations against the trend is favoured by an increase in moisturetransport in summer, autumn, and winter and a decrease in spring and, (2) ona daily basis, extreme humidity transport increases the formation of ice inwinter and decreases it in spring, summer, and autumn; in these three seasonsextreme humidity transporttherefore contributes to Arctic sea ice melting. These patterns differsharply from that linked to the decline on a long-range scale, especially insummer when the opposite trend applies, as ice melt is favoured by a decreasein moisture transport for this season at this scale.
