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. In the context of the Arctic amplification of climatechange affecting the regional atmospheric hydrological cycle, it is crucialto characterize the present-day moisture sources of the Arctic. Theisotopic composition is an important tool to enhance our understanding ofthe drivers of the hydrological cycle due to the different molecularcharacteristics of water stable isotopes during phase change. This studyintroduces 2 years of continuous in situ water vapour and precipitationisotopic observations conducted since July 2015 in the eastern Siberian Lenadelta at the research station on Samoylov Island. The vapour isotopicsignals are dominated by variations at seasonal and synoptic timescales.Diurnal variations of the vapour isotopic signals are masked by synopticvariations, indicating low variations of the amplitude of local sources atthe diurnal scale in winter, summer and autumn. Low-amplitude diurnalvariations in spring may indicate exchange of moisture between theatmosphere and the snow-covered surface. Moisture source diagnostics basedon semi-Lagrangian backward trajectories reveal that different air massorigins have contrasting contributions to the moisture budget of the Lenadelta region. At the seasonal scale, the distance from the net moisturesources to the arrival site strongly varies. During the coldest months, nocontribution from local secondary evaporation is observed. Variations of thevapour isotopic composition during the cold season on the synoptic timescaleare strongly related to moisture source regions and variations inatmospheric transport: warm and isotopically enriched moist air is linkedto fast transport from the Atlantic sector, while dry and cold air withisotopically depleted moisture is generally associated with air masses movingslowly over northern Eurasia.

Moisture origin as a driver of temporal variabilities of the water vapour isotopic composition in the Lena River Delta, Siberia