Asian summer monsoon orbital variability directly paced by CO2 and precession, not eccentricity

Nature Communications, Published online: 22 August 2026; doi:10.1038/s41467-026-76856-y Asian summer monsoon variability is investigated using climate model simulations covering the last 800 kyr. Greenhouse gases drive 100-kyr variability via its thermal forcing, while precession governs 20-kyr variability.