摘要：This study clarifies changes in the chemical forms of microparticles during Termination I, the period of drastic climate change between the Last Glacial Maximum (LGM) and the Holocene. We determine the chemical forms of individual water-soluble microparticles through micro-Raman spectroscopy and compare the relative frequencies of different types with the ion concentrations in melted ice. Micro-Raman spectroscopy shows that Na 2 SO 4 ·10H 2 O and MgSO 4 ·11H 2 O are abundant in Holocene ice, while CaSO 4 ·2H 2 O and other salts are abundant in LGM ice. Further, the number of CaSO 4 ·2H 2 O particles is strongly correlated with the concentration of Ca 2 during Termination I. Taken together, the evidence strongly suggests that most of the Ca 2 exists as CaSO 4 ·2H 2 O. The different compositions of microparticles from the Holocene and LGM can be explained by ion balance arguments.
