Late Pleistocene variability of Arabian Sea summer monsoon winds and continental aridity: Eolian records from the lithogenic component of deep‐sea sediments

摘要: The modern Indian Ocean summer monsoon is driven by differential heating between the Asian continent and to south. This produces a strong pressure gradient which drives southwest winds during June, July, August. Satellite meteorological observations, aerosol measurements, sediment trap studies, mineralogical studies indicate an atmospheric mode of transport for lithogenic sediments in northwest Arabian Sea. Analyses grain size mass accumulation rate (MAR) records from Owen Ridge that eolian has been primary past 370 kyr. Visual inspection shows MAR record positively correlated with global ice volume as indicated marine δ18O record. In contrast, grain-size varies at much higher frequency, showing little correlation either or records. Spectral analyses confirm these relationships, indicating are coherent only over precession band whereby leads 124° (∼8 kyr). We conclude mechanism allows this phase difference same time supported comparison independent use paleoclimatic indicator wind strength source-area aridity. These interpretations indicators (Globigerina bulloides upwelling record) aridity (a loess central China). Such comparisons high coherence zero relationships. Our work supports findings previous have documented link Earth's axial cycles. Both coherency precessional insolation. Maximum (source-area aridity) (global volume) maximum insolation 88° (∼6 attribute lead influence glacial conditions on aridity, therefore deflation potential, source areas. (summer strength) lags 148° (∼9 lag both and/or local availability latent heat southern hemisphere Ocean, two combine determine monsoon.