Comparing the F g in the AIS in 1961 with that in 2006, we identified a positive trend in F g (− 6 ± 2.2‰ to − 1 ± 0.4‰) from 1961 to 2006 (Fig. 2 c), implying that ice shelf freezing has been weakened, which may be related to mCDW intrusion 31 , 32 .
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Intense ocean freshening from melting glacier around the Antarctica during early twenty-first century.
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