Greenland records of aerosol source and atmospheric lifetime changes from the Eemian to the Holocene.

摘要: The Northern Hemisphere experienced dramatic changes during the last glacial, featuring vast ice sheets and abrupt climate events, while high northern latitudes interglacial (Eemian) were warmer than today. Here we use high-resolution aerosol records from Greenland NEEM core to reconstruct environmental alterations in source regions accompanying these changes. Separating transport effects, find strongly reduced terrestrial biogenic emissions glacial times reflecting net loss of vegetated area North America. Rapid have little effect on emissions. A strong increase dust coldest intervals indicates higher aridity storm activity East Asian deserts. Glacial sea salt Atlantic region only moderately (50%), likely due expansion. Lower concentrations Eemian compared Holocene are mainly shortened atmospheric residence time, changed little.