1. The formation of ice crystal clouds catalyzed by dust aerosols were observed by coherent Doppler wind lidar in the Taklimakan Desert. 2. The wind provides a dynamic basis for the formation of ice crystal clouds and plays an important role in the decomposition process. 3. The special basin topography, turbulence and downdrafts keep the base height of the ice crystal clouds at around 3 km.

This study evaluates the reliability of precipitation measurements from disdrometers under different wet-bulb temperatures. Using four years of 2DVD (Two-dimensional Video Disdrometer) data compared with tipping-bucket and weighing rain gauges, three quality control methods based on fall velocity showed high reliability (correlation > 0.98) when T_w exceeded 5 °C. However, accuracy declined sharply when T_w was below 2 °C, with correlation dropping below 0.6.

We evaluated different methods to obtain the ice nucleating particle (INP) concentration from ambient filters using GRAINS (GRAnada Ice Nuclei Spectrometer), the INP spectrometer at the Andalusian ObseRvatory of the Atmosphere (AGORA). We first characterized GRAINS and compared it to other INP devices. Then, we sampled polycarbonate and quartz filters for three months and tested three different particle extraction methods, finding general good agreement but that the INP concentration is systematically higher when using quartz filters.

Hypoiodous acid (HOI) and molecular iodine (I₂) are the dominant precursors of reactive gaseous iodine, which plays an important role in the atmospheric oxidative capacity and in aerosol formation. However, difficulties in the quantification of HOI and I₂ mean that very few measurements are available. This work describes a novel calibration method for HOI and reports the detection of HOI and I₂ in the marine boundary layer using Br^- chemical ionisation mass spectrometry.