Related Experiment Video
Updated: Apr 21, 2026

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
Orbital Asian summer monsoon dynamics revealed using an isotope-enabled global climate model
Thibaut Caley1, Didier M Roche2, Hans Renssen1
1Department of Earth Sciences, Earth and Climate Cluster, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, The Netherlands.
Asian speleothem records do not solely reflect summer monsoon intensity at orbital timescales. These records indicate annual hydrologic and circulation changes, influenced by factors like Pacific sea surface temperatures.
Area of Science:
- Paleoclimatology
- Climate Dynamics
- Isotope Geochemistry
Background:
- Orbital-scale dynamics of the Asian summer monsoon are debated.
- The reliability of speleothem oxygen isotopes (δ(18)O) as a proxy for monsoon intensity is questioned.
- The ultimate forcing and timing of monsoon shifts remain unclear.
Purpose of the Study:
- To investigate the validity of Asian speleothem δ(18)O records as a proxy for orbital-scale monsoon intensity.
- To understand the factors influencing speleothem δ(18)O variations in the Indo-Asian region.
- To clarify the forcing mechanisms behind Asian monsoon dynamics.
Main Methods:
- Conducted a 150,000-year transient climate simulation.
- Incorporated water isotope tracers into the simulation.
- Analyzed simulation outputs to interpret speleothem proxy data.
Main Results:
- Asian speleothem δ(18)O records are not exclusively representative of orbital-scale summer monsoon intensity.
- These records reflect annual variations in hydrology and atmospheric circulation across the Indo-Asian region.
- Equatorial Pacific sea surface temperature variations play a role in modulating monsoon precipitation timing.
Conclusions:
- Speleothem δ(18)O is a complex proxy influenced by multiple factors beyond just monsoon intensity.
- Internal climate variability, such as sea surface temperatures, significantly impacts regional monsoon precipitation.
- Re-evaluation of speleothem records is needed for accurate paleoclimate reconstructions.
More Related Videos
13:27Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
Published on: June 8, 2015
06:27Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer
Published on: May 29, 2019
Related Concept Videos
Precipitation Processes
Global Climate Change
Magnetostatic Boundary Conditions
Isochoric and Isobaric Processes
Suppose 1000 g of water is heated from 40...
Isothermal Processes
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is: