Because the trends in LHF and SHF are less affected by the main large-scale circulation indices, we seek the explanation in meteorological variables. The trends in air–sea-specific humidity difference, 10-m wind speed, and air–sea temperature difference are shown in Figs. 910–11. The spatial patterns of the trends in air–sea-specific humidity difference are similar to those of LHF among seasons (Fig. 9) but with some small differences. In summer, the significant increasing trend in LHF in the region south of Greenland does not correspond to the remarkable increasing trend in air–sea-specific humidity difference in the same region. In autumn, the extent of the significantly negative trends of air–sea-specific humidity difference exceeds that of LHF in the Okhotsk Sea. The spatial patterns of the trends in wind speed among seasons are not consistent with those of LHF, especially over the central North Atlantic Ocean in summer. But along some coasts, for example, the coasts of the Gulf of Alaska and North Europe, and the southern Hudson Bay, they show a certain consistency. According to the bulk parameterization of LHF, apart from wind speed and air–sea-specific humidity difference, aerodynamic transfer coefficient can also influence LHF. Moreover, the aerodynamic transfer coefficient is related to wind speed, and their relationship is nonlinear and complicated.16 Hence, the consistency of wind speed and LHF is various depending on the time and circumstances.