Related Experiment Video
Updated: Nov 15, 2025

06:10
Using Generative Art to Convey Past and Future Climate Transitions
Published on: March 31, 2023
1.3K
Multidecadal climate oscillations during the past millennium driven by volcanic forcing.
Michael E Mann1, Byron A Steinman2, Daniel J Brouillette3
1Department of Meteorology and Atmospheric Science, The Pennsylvania State University, 514 Walker Building, University Park, PA 16802-5013, USA. mann@psu.edu.
Summary
This study finds no evidence for internal multidecadal climate oscillations. Apparent oscillations in paleoclimate data are artifacts of preindustrial volcanic activity, not a distinct climate cycle.
Area of Science:
- Climate Science
- Paleoclimatology
- Climate Modeling
Background:
- Previous research proposed an internal multidecadal oscillation (40-60 years) in climate.
- Recent studies suggested the Atlantic Multidecadal Oscillation is driven by anthropogenic forcings.
- Current climate models lack robust multidecadal oscillations in control simulations.
Purpose of the Study:
- To investigate the origin of multidecadal oscillations observed in paleoclimate data.
- To determine if these oscillations represent an internal climate system behavior or an artifact.
Main Methods:
- Comparison of control and forced
- Last Millennium
- climate simulations.
- Analysis of paleoclimate data for multidecadal oscillatory behavior.
- Frequency band analysis of simulated climate variability.
Main Results:
- Paleoclimate data exhibit multidecadal oscillatory behavior during the preindustrial era.
- Apparent oscillations in preindustrial climate data are artifacts of volcanic activity pulses.
- Volcanic activity significantly influences the 50- to 70-year frequency band.
Conclusions:
- There is no compelling evidence for internal multidecadal oscillations in the climate system.
- The observed multidecadal variability is likely a result of external forcings, particularly volcanism.
More Related Videos
Related Concept Videos
Global Climate Change
27.9K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
27.9K
Isothermal Processes
4.4K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of 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...
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...
4.4K
Forced Oscillations
7.3K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
7.3K
Isochoric and Isobaric Processes
3.9K
A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only.
Suppose 1000 g of water is heated from 40...
Suppose 1000 g of water is heated from 40...
3.9K
The Carbon Cycle
42.4K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
42.4K
What is Climate?
19.9K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
19.9K

