Ice nucleating particles (INPs) affect the cloud radiative budget in the rapidly warming Arctic by changing the cloud liquid/ice phase balance. Dust emitted in the Arctic (Arctic dust) has been suggested to be a major contributor to INPs in the Arctic lower troposphere. However, how Arctic dust and its impacts on ice nucleation change with Arctic warming has not been explored. Here we find that the simulated dust emission flux in the Arctic (>60°N) in global model simulations increases by 20% from 1981–1990 to 2011–2020. This increase weakens the sensitivity of ice nucleation in Arctic lower tropospheric clouds to warming by 40% compared to the case without considering Arctic dust emission increases. Our results demonstrate a better understanding of the counterbalancing feedbacks of Arctic dust (i.e., increasing emissions and decreasing ice nucleation efficiency) is needed for more accurate estimates of changes in ice nucleation in the rapidly changing Arctic climate.

冰核粒子 （INPs） 通过改变云液/冰相平衡来影响快速变暖的北极的云辐射收支。北极排放的尘埃（北极尘埃）被认为是北极对流层低层 INP 的主要贡献者。然而，北极沙尘及其对冰核的影响如何随北极变暖而变化尚未得到探索。在这里，我们发现全球模式模拟中北极的模拟沙尘排放通量 （>60°N） 从 1981-1990 年到 2011-2020 年增加了 20%。与不考虑北极沙尘排放增加的情况相比，这种增加削弱了北极对流层低层云中冰核对变暖的敏感性 40%。我们的结果表明，需要更好地了解北极沙尘的平衡反馈（即增加排放和降低冰核效率），以便在快速变化的北极气候中更准确地估计冰核的变化。