# Earth Climate Drivers, Mediators, Resistors, Interactions, and Feedbacks
► Earth operates as an interconnected energy-water-rock-ocean-atmosphere-biosphere system spanning timescales from seconds to 4.6 billion years.
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# 1. Major Drivers
## External Drivers
### Galactic Cosmic Rays (GCRs)
▪ High-energy particles from outside the Solar System.
▪ Atmospheric ionization.
▪ Radiation environment.
▪ Cloud and atmospheric interactions.
▪ Modulated by solar activity and magnetic shielding.
### Solar Variability
▪ Solar irradiance changes.
▪ Sunspot cycles.
▪ Solar magnetic cycles.
▪ Solar flares and CMEs.
▪ Primary external energy source.
### Solar Inertial Motion (SIM)
▪ Sun's motion around Solar-System barycenter.
▪ Trochoidal and precessional motion.
▪ Long-term solar-cycle modulation.
### Orbital Cycles (Milankovitch)
▪ Eccentricity.
▪ Obliquity.
▪ Precession.
▪ Alters distribution of solar energy.
### Lunar Tides
▪ Ocean tides.
▪ Ocean mixing.
▪ Coastal circulation.
### Asteroid and Comet Impacts
▪ Tsunamis.
▪ Dust loading.
▪ Surface restructuring.
▪ Mass-extinction events.
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## Internal Drivers
### Deep Earth Heat
▪ Stored since Earth's formation.
▪ Primordial heat.
▪ Radiogenic heat.
▪ Powers mantle convection.
### Mantle Convection
▪ Rising and sinking mantle.
▪ Drives plate tectonics.
▪ Reshapes continents and oceans.
### Tectonic Upwelling
▪ Mantle plumes.
▪ Rifts.
▪ Hotspots.
### Seafloor Spreading
▪ New ocean crust formation.
▪ Ocean basin evolution.
### Hydrothermal Activity
▪ Ocean-crust fluid circulation.
▪ Heat and chemical transfer.
### Volcanism
▪ Heat transfer.
▪ Ash.
▪ Sulfur compounds.
▪ Water vapor.
▪ Carbon-bearing gases.
### Plate Tectonics
#### Divergent Boundaries
▪ New crust.
▪ Ocean expansion.
#### Convergent Boundaries
▪ Mountain building.
▪ Subduction.
▪ Volcanic arcs.
#### Transform Boundaries
▪ Fault systems.
▪ Basin development.
### Earth's Magnetic Field Variations
▪ Cosmic-ray shielding.
▪ Space-weather interactions.
▪ South Atlantic Anomaly.
▪ Weak-field regions extending through South America, South Atlantic, southern Africa, Indian Ocean, and toward Southeast Asia.
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# 2. Major Mediators
## Oceanic Mediator
### Ocean Circulation
▪ Thermohaline circulation.
▪ Global conveyor belt.
▪ Surface currents.
▪ Deep currents.
### Ocean Heat Content
▪ Largest active heat reservoir.
▪ Thermal inertia.
▪ Heat redistribution.
### Water Enthalpy
▪ Heat storage.
▪ Latent heat transport.
### Phase Changes
▪ Evaporation.
▪ Condensation.
▪ Freezing.
▪ Melting.
### Sea Ice
▪ Reflectivity control.
▪ Ocean-atmosphere insulation.
### Ocean Acidification
▪ Carbonate chemistry.
▪ Ocean buffering.
### Carbon Cycle
▪ Atmosphere-ocean exchange.
▪ Biological cycling.
▪ Sedimentary storage.
### Ocean Biogeochemistry
▪ Carbon.
▪ Nitrogen.
▪ Phosphorus.
▪ Sulfur.
▪ Silicon.
▪ Iron.
### Marine Ecosystems
▪ Phytoplankton.
▪ Zooplankton.
▪ Fisheries.
▪ Deep-sea ecosystems.
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# 3. Major Resistors
## Deep Ocean Heat Storage
▪ Largest thermal capacitor.
▪ Delays climate responses.
## Rock Weathering
▪ Chemical buffering.
▪ Mineral cycling.
## Carbonate Systems
▪ Long-term chemical stabilization.
## Sedimentary Burial
▪ Carbon storage.
▪ Nutrient storage.
## Hydrocarbon Reservoirs
▪ Coal.
▪ Oil.
▪ Natural gas.
## Soil Organic Matter
▪ Nutrient storage.
▪ Water retention.
## Forest Biomass
▪ Carbon storage.
▪ Water storage.
▪ Ecosystem buffering.
## Deep Earth Heat Storage
▪ 4.6 billion years of accumulated internal energy.
▪ Mantle and core heat reservoirs.
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# 4. Major Interactions
## Space-Earth
▪ Solar Variability ↔ GCRs
▪ Solar Variability ↔ Magnetosphere
▪ Magnetosphere ↔ Atmosphere
## Ocean-Atmosphere
▪ Evaporation
▪ Condensation
▪ Heat exchange
▪ Storm generation
## Ocean-Ice
▪ Sea ice formation
▪ Sea ice melting
▪ Albedo changes
## Ocean-Biosphere
▪ Nutrient cycling
▪ Biological productivity
## Ocean-Geology
▪ Hydrothermal circulation
▪ Seafloor spreading
## Tectonics-Oceans
▪ Ocean gateway formation
▪ Ocean basin evolution
## Tectonics-Atmosphere
▪ Volcanism
▪ Mountain building
▪ Weathering
## Biosphere-Geosphere
▪ Carbon burial
▪ Soil formation
▪ Forest expansion
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# 5. Major Feedbacks
## Negative Feedbacks
### Ocean Heat Uptake
▪ Buffers rapid energy changes.
### Weathering Feedback
▪ Increased weathering stabilizes long-term chemistry.
### Ocean Carbon Uptake
▪ Transfers carbon to deep ocean and sediments.
### Forest Growth
▪ Biomass accumulation.
▪ Soil development.
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## Positive Feedbacks
### Ice-Albedo Feedback
▪ Less ice → less reflection → more absorption.
### Ocean Heat Feedback
▪ More stored heat → greater heat redistribution.
### Water Vapor Feedback
▪ More evaporation → greater atmospheric energy transport.
### Ocean Circulation Feedback
▪ Circulation changes alter regional climates.
### Volcanic-Tectonic Feedbacks
▪ New rock exposure.
▪ Enhanced weathering.
▪ Nutrient redistribution.
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# Time Scales of Influence
## Seconds to Minutes
▪ Earthquakes.
▪ Tsunamis.
▪ Solar flares.
▪ Lightning.
▪ Volcanic explosions.
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## Hours to Days
▪ Day-night cycle.
▪ Storms.
▪ Floods.
▪ Cyclones.
▪ Tides.
### Cataclysmic Threshold Releases
▪ Major earthquakes.
▪ Mega-tsunamis.
▪ Volcanic eruptions.
▪ Landslides.
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## Seasons to Years
▪ Monsoons.
▪ Ocean-atmosphere oscillations.
▪ Sea-ice changes.
▪ Ecosystem cycles.
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## Decades to Centuries
▪ Solar cycles.
▪ Ocean circulation shifts.
▪ Glacier changes.
▪ Forest changes.
▪ Intervals between major cataclysmic events.
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## Thousands to Millions of Years
▪ Ice ages.
▪ Milankovitch cycles.
▪ Carbon burial.
▪ Desertification.
▪ Soil formation.
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## Millions to Hundreds of Millions of Years
▪ Plate tectonics.
▪ Mountain building.
▪ Ocean basin evolution.
▪ Supercontinent cycles.
▪ Large igneous provinces.
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## Billions of Years
▪ Solar evolution.
▪ Mantle cooling.
▪ Core evolution.
▪ Magnetic-field evolution.
▪ Ocean evolution.
▪ Atmospheric evolution.
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# Simplified Earth Energy Budget
## Incoming Solar Radiation
▪ 100%
### Reflected (Albedo)
▪ ~30%
### Absorbed by Earth System
▪ ~70%
Absorbed by:
▪ Oceans
▪ Atmosphere
▪ Land
▪ Ice
▪ Biosphere
### Outgoing Longwave Radiation
▪ ~70%
Returned to space as thermal radiation.
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## If Earth Disappeared
▪ Reflected = 0%
▪ Absorbed = 0%
▪ Emitted by Earth = 0%
Solar radiation simply passes through the location into space.
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# System Hierarchy
► Primary Energy Source
▪ Sun
► Primary External Modulators
▪ Galactic Cosmic Rays
▪ Solar Variability
▪ Orbital Cycles
▪ Lunar Tides
▪ Asteroid Impacts
► Primary Internal Engine
▪ Deep Earth Heat
▪ Mantle Convection
▪ Plate Tectonics
▪ Volcanism
▪ Hydrothermal Activity
► Primary Mediator
▪ Oceans
► Primary Resistors
▪ Oceans
▪ Rocks
▪ Soils
▪ Forests
▪ Sediments
▪ Deep Earth Heat Storage
► Result
▪ Energy is received, reflected, absorbed, stored, transported, buffered, amplified, and released through interacting systems operating from seconds to billions of years across the atmosphere, oceans, cryosphere, lithosphere, biosphere, mantle, and space environment.
