Climate Change
Albedo: The reflectivity of a surface. Higher albedo surfaces, like ice, reflect more solar radiation, leading to cooling.
Anthropogenic: Caused by human activities.
Archean Eon: A geological eon from 4.0 to 2.5 billion years ago, characterized by the early evolution of life, a reducing atmosphere, and warmer temperatures despite a fainter sun.
Carbon Cycle: The biogeochemical cycle by which carbon circulates between the atmosphere, oceans, biosphere, and lithosphere.
Climate Forcing: A factor that influences Earth's climate system, either externally (e.g., solar radiation) or internally (e.g., volcanic eruptions).
Climate Feedback: A process that amplifies (positive feedback) or diminishes (negative feedback) the effects of climate forcing.
Cryogenian Period: A geological period within the Neoproterozoic Era, marked by several severe global glaciations, potentially resulting in a "Snowball Earth."
Dansgaard-Oeschger (D-O) Events: Abrupt warming events during the last glacial period, characterized by rapid temperature increases over decades.
Eccentricity: The degree to which Earth's orbit deviates from a perfect circle, influencing the amount of solar radiation received over a year.
Greenhouse Effect: The trapping of heat in the Earth's atmosphere by gases like carbon dioxide, methane, and water vapor.
Heinrich Events: Episodes of massive iceberg discharges into the North Atlantic during the last glacial period, causing climate disruptions.
Holocene Epoch: The current interglacial period, spanning the last 11,700 years.
Hydrolysis: A chemical weathering process that removes atmospheric CO2 by reacting silicate minerals with carbonic acid, forming carbonates and releasing ions.
Ice Core: A core sample drilled from a glacier or ice sheet, containing layers of ice that preserve information about past atmospheric composition and temperature.
Interglacial Period: A warmer period between glacial periods, characterized by retreating ice sheets and higher sea levels.
Milankovitch Cycles: Cyclical variations in Earth's orbital parameters (eccentricity, obliquity, precession) that influence the amount and distribution of solar radiation, affecting long-term climate patterns.
Obliquity: The tilt of Earth's rotational axis, influencing the intensity of seasons.
Paleocene-Eocene Thermal Maximum (PETM): A period of abrupt global warming about 55 million years ago, possibly triggered by the release of methane hydrates, leading to significant environmental changes.
Phanerozoic Eon: The current geological eon, spanning the last 541 million years, characterized by the evolution and diversification of complex life forms.
Pleistocene Epoch: The first epoch of the Quaternary Period, spanning from 2.58 million to 11,700 years ago, characterized by glacial-interglacial cycles.
Precession: The wobble of Earth's rotational axis, affecting the timing of the seasons relative to Earth's position in its orbit.
Proxy Data: Indirect sources of climate information from natural archives like tree rings, ice cores, and sediments.
Quaternary Period: The current geological period, spanning the last 2.58 million years, encompassing the Pleistocene and Holocene Epochs, characterized by significant climate fluctuations.
Radiative Forcing: The difference between incoming and outgoing energy radiation at the top of the atmosphere, influencing Earth's energy balance and climate.
Snowball Earth: A hypothetical state where Earth's surface was entirely or nearly entirely frozen, potentially occurring during the Neoproterozoic Era.
Thermohaline Circulation: The global ocean circulation driven by density differences caused by temperature (thermo) and salinity (haline) variations.
Younger Dryas: A brief return to glacial conditions that interrupted the deglacial warming trend at the end of the last glacial period, possibly caused by disruptions to the thermohaline circulation.