Comprehensive Review: Mechanisms and Impacts of Earth's Changing Climate

Greenhouse Effect

A natural process that warms the Earth's surface.

Infrared Radiation

Lower-energy heat that the Earth re-radiates back toward space.

Greenhouse Gases (GHGs)

Gases that trap outgoing infrared radiation, warming the atmosphere.

Water Vapor ($H_2O$)

The most abundant natural greenhouse gas, with a short residence time in the atmosphere.

Carbon Dioxide ($CO_2$)

The primary greenhouse gas of concern due to human activity, with a long residence time.

Methane ($CH_4$)

A more potent greenhouse gas than $CO_2$, but existing in lower concentrations.

Nitrous Oxide ($N_2O$)

A highly potent greenhouse gas produced by agricultural activities.

Chlorofluorocarbons (CFCs)

Synthetic gases with immense heat-trapping capabilities, banned by the Montreal Protocol.

Global Warming Potential (GWP)

A measure of how much heat a gas traps in the atmosphere relative to carbon dioxide.

Positive Feedback Loops

Processes where rising temperatures cause cycles that lead to further warming.

Global Climate Change

Broad changes occurring on Earth due to excess heat, affecting ecosystems and weather.

Melting Ice Sheets

Contributes directly to sea-level rise from land-based ice like Greenland and Antarctic sheets.

Thermal Expansion

The increase in ocean water volume as temperatures rise, contributing to sea-level rise.

Coral Bleaching

The expulsion of algae from corals due to stress from rising water temperatures.

Ocean Acidification

Chemical absorption of $CO_2$ in seawater, leading to lower pH and impacting marine life.

Calcium Carbonate ($CaCO_3$)

A substance that marine organisms need to build shells and skeletons.

Ozone Hole

Reduced stratospheric ozone that allows more UV radiation to hit Earth.

Weather vs. Climate

Weather refers to short-term atmospheric conditions, while climate is long-term patterns.

Metabolic Changes in Marine Organisms

Increased temperatures lead to faster metabolic rates, affecting growth and reproduction.

Oxygen Depletion

Warmer ocean water holds less dissolved oxygen, causing hypoxia and fish kills.

Range Shifts in Ecosystems

Organisms migrating to maintain optimal temperature ranges due to climate change.

Changed Migration Patterns

Alterations in migration timing of birds and marine life due to changing climates.

Impacts on Weather Patterns

Increased storm intensity and altered precipitation due to climate change.

Dissociation of Carbonic Acid

The process where carbonic acid breaks down, contributing to ocean acidification.

Melting Permafrost

Thawing ground in tundra regions that destabilizes infrastructure and releases methane.

Phenological Mismatch

Discrepancies between the timing of natural events like migration and food availability.

Fossil Fuel Combustion

Primary anthropogenic source of $CO_2$ contributing to increased greenhouse gases.