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Session Length
~17 min
Adaptive Checks
15 questions
Transfer Probes
8
Climatology is the scientific study of climate, defined as weather conditions averaged over extended periods of time, typically 30 years or more. Unlike meteorology, which focuses on short-term atmospheric phenomena, climatology examines the long-term patterns, variability, and trends in temperature, precipitation, wind, humidity, and other atmospheric variables. The discipline draws on physics, chemistry, geography, oceanography, and biology to construct a holistic understanding of Earth's climate system and the forces that drive it.
The field encompasses several major branches, including paleoclimatology (the study of past climates using ice cores, tree rings, and sediment records), synoptic climatology (linking large-scale atmospheric circulation patterns to surface climate), and applied climatology (using climate data for agriculture, urban planning, energy, and public health). Advances in satellite remote sensing, global climate models, and high-performance computing have transformed climatology from a descriptive science into a powerful predictive discipline capable of projecting future climate scenarios under different greenhouse gas emission pathways.
Today, climatology occupies a central role in addressing one of humanity's greatest challenges: anthropogenic climate change. Climatologists contribute to the Intergovernmental Panel on Climate Change (IPCC) assessments, inform international climate negotiations, and develop adaptation and mitigation strategies. Understanding climatology is essential not only for scientists and policymakers but also for anyone seeking to comprehend how Earth's climate has changed in the past, how it is changing now, and what the future may hold.
One step at a time.
The complex, interactive system consisting of five major components: the atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere. Energy exchanges and feedbacks among these components determine Earth's climate at local, regional, and global scales.
Example: The El Nino-Southern Oscillation (ENSO) demonstrates how ocean-atmosphere coupling in the tropical Pacific can alter weather patterns across the entire globe, causing droughts in Australia and floods in South America.
The difference between the incoming solar radiation absorbed by Earth and the outgoing longwave radiation emitted back to space. Positive radiative forcing warms the surface, while negative forcing cools it. It is measured in watts per square meter (W/m2).
Example: Since pre-industrial times, the increase in atmospheric CO2 has produced a radiative forcing of approximately +2.1 W/m2, while volcanic aerosols from major eruptions like Mount Pinatubo temporarily produced negative forcing that cooled the planet.
The process by which greenhouse gases in the atmosphere (such as CO2, methane, and water vapor) absorb and re-emit infrared radiation, trapping heat near Earth's surface. Without the natural greenhouse effect, Earth's average temperature would be roughly -18 degrees Celsius instead of the current +15 degrees Celsius.
Example: Venus has a runaway greenhouse effect: its thick CO2 atmosphere traps so much heat that surface temperatures reach about 465 degrees Celsius, making it hotter than Mercury despite being farther from the Sun.
Periodic variations in Earth's orbital geometry, including eccentricity (shape of orbit), obliquity (axial tilt), and precession (wobble of axis), that occur over tens of thousands of years. These cycles alter the distribution and intensity of solar radiation reaching Earth and are a primary driver of glacial-interglacial cycles.
Example: Over the past 800,000 years, ice core records show that glacial periods have recurred roughly every 100,000 years, closely tracking changes in Earth's orbital eccentricity as predicted by Milankovitch theory.
Processes that amplify (positive feedback) or dampen (negative feedback) an initial climate perturbation. Feedbacks determine the overall sensitivity of the climate system to changes in radiative forcing and are critical for understanding how much warming results from a given increase in greenhouse gases.
Example: The ice-albedo feedback is a positive feedback: warming melts reflective ice, exposing darker ocean or land, which absorbs more solar radiation, causing further warming and more ice loss.
Complex computer simulations that represent the physical processes in the atmosphere, ocean, cryosphere, and land surface using mathematical equations. GCMs divide the Earth into a three-dimensional grid and solve equations for energy, momentum, and mass conservation at each grid cell over time.
Example: The CMIP6 ensemble of general circulation models, used in IPCC assessments, projects global mean surface temperature increases ranging from approximately 1.5 to 4.5 degrees Celsius by 2100 under different Shared Socioeconomic Pathways.
The global ocean circulation pattern driven by differences in water density created by variations in temperature (thermo) and salinity (haline). This large-scale overturning circulation redistributes heat from the tropics to the poles and plays a fundamental role in regulating regional and global climate.
Example: The Atlantic Meridional Overturning Circulation (AMOC) transports warm surface water northward in the Atlantic, keeping Western Europe several degrees warmer than equivalent latitudes in North America. Scientists are monitoring it for signs of weakening due to freshwater input from melting Greenland ice.
The study of past climates using natural archives known as proxy records, including ice cores, tree rings, ocean sediment cores, cave speleothems, and coral records. Paleoclimatology provides context for understanding current climate change by revealing how climate has varied naturally over thousands to millions of years.
Example: Analysis of Antarctic ice cores from the Vostok and EPICA Dome C projects has reconstructed atmospheric CO2 concentrations and temperatures over the past 800,000 years, showing that current CO2 levels exceed anything in that record.
More terms are available in the glossary.
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