| Summary: | The dataset presented here contains continuous water vapor isotopic (δ18O, δD, deuterium excess) measurements during the autumn 2021 cruise on the US Coast Guard Cutter (USCGC) Healy. The cruise (HLY21TD, HLY2101) includes transiting coastal Alaska, through the Northwest Passage and Canadian Archipelago, and transects of Baffin Bay, the Labrador Sea, and coastal West Greenland. Water vapor isotopic measurements were collected continuously from the bow of the ship (11 m above the sea surface) along the cruise track between 31 August through 07 October 2021. These vapor measurements are directly related to a similar dataset of seawater isotopic observations during this same cruise. With relatively water vapor isotopic measurements over Arctic ocean waters, this dataset provides important observations of ocean-atmosphere interactions in regions where significant sea ice loss has occurred. These observations allow for the measurement of evaporative fluxes and tracing of this new moisture from its point of origin to sites downwind as the moisture is transported around the Arctic.
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