On coarse patterns in the atmospheric concentration of ice nucleating particles

The atmospheric concentration of ice nucleating particles active at around-10 degrees C (INP-10) is very low. Nevertheless, these particles play a role in the development of cloud systems, so their spatial and temporal patterns merit attention. We collated available datasets on INP-10 to identify such patterns. Among the five low altitude observatories in northern Eurasia, median values throughout May to October were lowest in Scandinavia (4 and 6 m- 3), somewhat higher in central Europe (11 m- 3), substantially higher in the West Siberian Plain (69 m- 3) and highest in the Central Yakutian Lowland (204 m- 3), suggesting that the abundance of INP-10 in northern Eurasia may increase with continentality and from West to East. The range of values at the same ob-servatories was narrower throughout November to April (2 to 27 m- 3). On average, by an order of magnitude smaller values were reported for the four Arctic observatories. Consequently, increasing poleward transport of air masses from the midlatitudes likely raises the concentration of INP-10 in the Arctic, particularly when air masses had surface contact in eastern parts of northern Eurasia

Oribatid mites in a succession of permafrost soils in Central Yakutia

ABSTRACTThermokarst troughs formed on ice-rich ground in Central Yakutia harbor contrasting soils that have developed from lake silt through a marsh stage to meadow and steppe-like soils. Associated processes result in radical transformations of an important component of the decomposer community in the biological cycle—the oribatid mites community. During the transition of soil from a Histic Reductaquic Cryosol to a Gleyic Cryosol and, finally, to a Turbic Chernic Cryosol, the number of species increased from three to six to thirteen. Total abundance of oribatid mites increased from 1,600 m−2 (±265) to 2,442 m−2 (±328) to 8,640 (±588) m−2. A characteristic feature of these permafrost soils was the considerable similarity of the populations in the Gleyic Cryosol and the Turbic Chernic Cryosol and their negligible overlap with the oribatids population of the Histic Reductaquic Cryosol. The peculiarity of the Histic Reductaquic Cryosol is manifested both in quantitative parameters of the communities and in their qualitative characteristics, such as the dominance structure and the sets of species with different ecological preferences

Hyperon signatures in the PANDA experiment at FAIR

We present a detailed simulation study of the signatures from the sequential decays of the triple-strange pbar p -> Ω+Ω- -> K+ΛbarK- Λ -> K+pbarπ+K-pπ- process in the PANDA central tracking system with focus on hit patterns and precise time measurement. We present a systematic approach for studying physics channels at the detector level and develop input criteria for tracking algorithms and trigger lines. Finally, we study the beam momentum dependence on the reconstruction efficiency for the PANDA detector