Summer and nonsummer climatic signals in speleothem δ¹⁸O revealed by loess microcodium δ¹⁸O in East Asia.

ABSTRACT: Speleothem δ¹⁸O records from central southern China have long been regarded as a key benchmark for Asian summer monsoon intensity. However, the similar δ¹⁸O minima observed among precession minima and their link to seasonal precipitation mixing remains unclear. Here, we present a 400,000-y record of summer precipitation δ¹⁸O from loess microcodium, which captures distinct precession cycles similar to those seen in speleothem δ¹⁸O records, particularly during glacial periods. Notably, our microcodium δ¹⁸O record reveals very low-δ¹⁸O values during precession minima at peak interglacials, a feature absent in speleothem δ¹⁸O records from central southern China. This discrepancy suggests that the mixed summer and nons

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC12280954 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature