Energy Flow in Global Systems
Ms. Terkper's Digital Classroom — Social and Environmental Contexts Emphasis
Focusing Questions
"Are there relationships between solar energy, global energy transfer processes, climate and biomes? What evidence suggests our climate may be changing more rapidly than living species can adapt? Is human activity causing climate change? How can we reduce our impact on the biosphere and on global climate, while still meeting human needs?"
Program Outcomes
Key Concepts
Unit Overview
Solar energy sustains all life on Earth and drives global climate systems. The absorption and transfer of thermal energy at and near Earth's surface produces climate zones and biomes. The IPCC states the balance of evidence suggests a human influence on global climate, and scientists are studying the potential impact on biomes.
Solar Energy & Earth's Energy Systems
Earth's Major Spheres
Layer of gases surrounding Earth. Contains N2 (78%), O2 (21%), Ar, CO2, H2O vapor, and trace greenhouse gases. Layers: troposphere, stratosphere, mesosphere, thermosphere.
All water on Earth: oceans (~97%), ice caps and glaciers (~2%), freshwater lakes, rivers, groundwater. Oceans cover ~71% of Earth's surface. Stores and transports thermal energy.
Solid outer layer of Earth including the crust and upper mantle. Contains rocks, soil, and minerals. Influences climate through topography, mountain ranges, and land surface albedo.
The zone of life on Earth — all ecosystems from ocean floor to mountain tops. Depends on inputs from all other spheres. Interacts with climate through respiration, photosynthesis and transpiration.
The greenhouse effect is the process by which greenhouse gases in the atmosphere trap outgoing infrared (longwave) radiation from Earth's surface, warming the planet.
Natural vs Enhanced Greenhouse Effect
The natural greenhouse effect keeps Earth ~33°C warmer than it would otherwise be. The enhanced greenhouse effect is caused by human activity increasing greenhouse gas concentrations, leading to additional warming beyond the natural baseline.
| Gas | Formula | Source | Warming Potential |
|---|---|---|---|
| Water Vapour | H2O | Evaporation | Natural; ~50% of total GH effect |
| Carbon Dioxide | CO2 | Combustion, deforestation | GWP = 1 (reference) |
| Methane | CH4 | Livestock, landfills, wetlands | GWP = 28–36 (over 100 yr) |
| Nitrous Oxide | N2O | Fertilizers, combustion | GWP = ~265 |
| Ozone | O3 | Chemical reactions in atm. | Complex; also shields UV |
Global Energy Transfer Processes
Factors Affecting Solar Energy at Earth's Surface
- Angle of inclination: Low-angle sunlight is spread over a larger area, delivering less energy per m² (explains why poles are cooler)
- Length of daylight: More hours of sunlight = more energy absorbed (seasons)
- Cloud cover: Clouds reflect incoming shortwave radiation; also trap outgoing infrared
- Albedo: Fraction of solar energy reflected; snow/ice high (~80%), ocean low (~6%)
- Aerosols & particulates: Volcanic ash and pollution scatter and absorb radiation
The Hydrologic Cycle
The continuous movement of water through the Earth's systems. Transfers enormous amounts of thermal energy through phase changes (evaporation, condensation, melting, freezing).
Liquid → gas; absorbs energy
Gas → liquid; releases energy
Rain, snow, sleet, hail
Water flows back to oceans
Global Wind Patterns
Coriolis Effect
Earth's rotation deflects moving air and water to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This creates the curved paths of winds and ocean currents. It also causes cyclones to rotate counterclockwise in the Northern Hemisphere.
Albedo — Surface Reflectivity Explorer
Click a surface type to see its albedo (reflectivity) and relative contribution to heating or cooling. Higher albedo = more reflection = less warming.
Heat Transfer Calculations
| Substance | c (J/g·°C) | Significance |
|---|---|---|
| Water (liquid) | 4.18 | Very high c — oceans act as a giant heat buffer, moderating coastal climates |
| Ice | 2.09 | Lower than liquid water; glaciers warm faster than oceans |
| Steam (water vapour) | 2.01 | Important in atmospheric energy transfer |
| Dry Air | 1.01 | Low c — air heats and cools quickly over land |
| Sand / Soil | ~0.84 | Very low c — deserts have extreme temperature swings day/night |
| Granite (rock) | 0.79 | Rocks heat and cool rapidly; amplifies temperature range in continents |
Why Water Has Such High Specific Heat
Water molecules form strong hydrogen bonds. A large amount of energy is needed to break these bonds and increase temperature. This makes water an excellent thermal buffer — oceans and large lakes resist large temperature changes, which is why coastal cities have milder climates than inland cities at the same latitude.
- Hfus = 6.01 kJ/mol (melting ice at 0°C)
- Hvap = 40.7 kJ/mol (boiling water at 100°C)
- c(liquid) = 4.18 J/g·°C
Sensible Heat Calculator
Heat of Fusion
Heat of Vaporization
World's Major Biomes
A biome is an open system characterized by specific climatic conditions (temperature, precipitation, sunlight, wind) and topography. Biomes with similar characteristics can exist at similar latitudes anywhere in the world.
Alberta Connection
Alberta spans multiple biomes: the southern prairies are grassland, the northern half of the province transitions through taiga (boreal forest), and the Rocky Mountains create alpine tundra at high elevations. Climate change is already impacting all three of these biomes in Alberta, with particular concern for the shrinking of glaciers in the Rockies and permafrost thaw in the north.
Human Activity & Climate Change
| Evidence Type | How It Works | What It Shows |
|---|---|---|
| Ice Core Samples | Air bubbles trapped in ancient ice preserve samples of past atmospheres | CO2 and temperature data going back 800,000 years; clear correlation |
| Tree Ring Analysis (Dendrochronology) | Width and density of annual growth rings records climate conditions | Drought periods, temperature anomalies, past centuries of climate |
| Coral Records | Coral skeletons record ocean temperature and chemistry | Sea surface temperatures and acidification over centuries |
| Sediment Cores | Lake and ocean bottom sediments preserve pollen and organisms | Past vegetation and climate conditions |
| Satellite Imaging | Continuous monitoring of ice extent, vegetation, sea level | Measurable shrinkage of Arctic ice pack; rising sea levels |
High-Risk Impacts
- Arctic ice pack reduction — loss of polar bear habitat; impacts Inuit communities' traditional lifestyle and food security
- Permafrost thaw — releases CH4; destabilizes infrastructure in northern communities
- Rising sea levels — threatens coastal cities and low-lying nations
- Coral reef bleaching — ocean warming and acidification
- Increased extreme weather events (droughts, floods, heat waves)
Moderate-Risk Impacts
- Shifts in biome boundaries as temperature zones move poleward
- Changes to Alberta's agriculture seasons and crop suitability zones
- Altered precipitation patterns; changing river flows
- Species range shifts; mismatched migration/bloom timing
Multiple Perspectives on Climate Action
Gaia Hypothesis (James Lovelock, 1970s): Earth acts as a self-regulating system — living organisms interact with their inorganic environment to maintain conditions suitable for life.
Traditional Aboriginal Perspectives: Indigenous worldviews have long emphasized relational thinking — humans are part of the natural world, not separate from it. Practices of stewardship and reciprocity with the land are seen as responsibilities, not choices.
| Organization / Program | Role |
|---|---|
| IPCC — Intergovernmental Panel on Climate Change | Reviews and synthesizes global climate research; publishes assessment reports used by governments worldwide for policy decisions |
| WMO — World Meteorological Organization | Coordinates global network of weather and climate observation; produces international weather standards |
| World Weather Watch | Global system of weather observation, analysis and forecasting using satellites, ground stations and ocean buoys |
| Global Atmosphere Watch (GAW) | Monitors greenhouse gases, ozone, aerosols and acid rain globally; provides long-term data trends |
| SHEBA Project | Surface Heat Budget of the Arctic Ocean — studied how solar energy is absorbed by Arctic ice and open water; critical for understanding ice-albedo feedback |
| Paleoclimate Research | Studies past climate using ice cores, sediments, tree rings; provides context for current changes and validates climate models |
Interactive Practice & Quizzes
Knowledge Check Quiz
Test your understanding of global energy systems, biomes and climate change.
Global Systems — Science 10
Biome Characteristics Match
Match each biome on the left with its key characteristic on the right.
Vocabulary Flashcards
Click card to flip. Use arrows to navigate all 20 terms.