000030114 001__ 30114
000030114 041__ $$aEnglish
000030114 100__ $$aDuchi, R.
000030114 245__ $$aSynoptic-Scale Dust Transport Events in the Southern Himalaya
000030114 260__ $$c2014
000030114 300__ $$a51-57
000030114 520__ $$aThe variability of long-range dust transport events observed in the southern Himalaya and its relation with source areas have been studied thanks to five years’ continuous measurements which were carried out at the “Nepal Climate Observatory-Pyramid” (NCO-P, 27°57′N, 86°48′E), the highest Northern Hemisphere GAW-WMO global station sited at 5079 m a.s.l. in the high Khumbu valley (Nepal) on the southern Himalaya. During the period March 2006–February 2011, the analyses of the aerosol particle concentrations and LAGRANTO three-dimensional backward trajectories indicated the occurrence of 275 days affected by synoptic-scale dust transport, which account for 22.2% of the investigated period. The frequency of dust transport days (DTDs) showed a clear seasonal cycle, with the highest seasonal value observed during pre-monsoon season (33.5% of the pre-monsoon’s days are DTDs). Large enhancements in coarse aerosol number concentration N1–10 (average: +689%) and mass PM1–10 (average: +1086%) were observed during the dust transport events as compared to the days without dust (dust-free days, DFDs). In addition, the single scattering albedo (SSA) also showed higher values, ranging from 0.87 to 0.90, during DTDs with respect to DFDs (0.80–0.87). The predominant source of mineral dust reaching the measurement site was identified in the arid regions of the north-western Indian subcontinent (Thar desert), which accounted for 41.6% of the trajectories points associated with DTDs. Seasonal analysis also indicated that the winter season was significantly influenced by far western desert regions, such as North Africa and the Arabic Peninsula.
000030114 700__ $$aCristofanelli, P.
000030114 700__ $$aMarinoni, A.
000030114 700__ $$aBourcier, L.
000030114 700__ $$aLaj, P.
000030114 700__ $$aCalzolari, F.
000030114 700__ $$aAdhikary, B.
000030114 700__ $$aVerza, G. P.
000030114 700__ $$aVuillermoz, E.
000030114 700__ $$aBonasoni, P.
000030114 773__ $$pAeolian Research
000030114 773__ $$v13 (0)
000030114 773__ $$ahttp://dx.doi.org/10.1016/j.aeolia.2014.03.008
000030114 8564_ $$uhttp://www.sciencedirect.com/science/article/pii/S1875963714000275$$yExternal link (open access)
000030114 980__ $$aARTICLE