Find in Library

This study investigates the relationship of cloud properties and radiative effects with air mass origin during the winter (November–February, 2016–2020) at Ny-Ålesund, Svalbard, through a combination of cloud radar, ceilometer, and microwave radiometer measurements. The liquid cloud fraction (CF) was less than 2%, whereas the ice CF predominantly exceeded 10% below 6 km. The liquid water content (LWC) of mixed-phase clouds (LWC_mix), which predominantly exist in the boundary layer (CF_mix: 10–30%), was approximately four times higher than that of liquid clouds (LWC_liq). Warm air mass advection (<i>warm_adv</i>) cases were closely linked with strong southerly/southwesterly winds, whereas northerly winds brought cold and dry air masses (<i>cold_adv</i>) to the study area. Elevated values of LWC and ice water content (IWC) during <i>warm_adv</i> cases can be explained by the presence of mixed-phase clouds in the boundary layer and ice clouds in the middle troposphere. Consistently, the <i>r_e</i> of ice particles in <i>warm_adv</i> cases was approximately 5–10 μm larger than that in <i>cold_adv</i> cases at all altitudes. A high CF and cloud water content in <i>warm_adv</i> cases contributed to a 33% (69 W m⁻²) increase in downward longwave (LW) fluxes compared to cloud-free conditions.