Shared Flashcard Set

Details

Global Warming Midterm
Key Terms and Concepts
62
Geology
Undergraduate 3
04/30/2009

Additional Geology Flashcards

 


 

Cards

Term

 

 

Stefan-Boltzman Law

&

Blackbody Radiation

Definition
Law stating that the total energy radiated from a black body is proportional to the fourth power of its absolute temperature. Energy in space where peak energy emittecd druing visibel layers of spectrum.
Term
Absorption Spectra
Definition
 Shows the fraction of incident electromagnetic spectrum absorbed by the material over a range of frequencies. Opposite of emissions spectrum. Used to identify certain elements present in a gas or liquid.
Term
Shortwave Radiation
Definition
One of the two flows. Contains the visivle and UV or the shorter wavelengths. Balance between what is absorbed and what is reflected back out into space. Sun's energy output.
Term
Longwave Radiation
Definition
INFARED. This is where the greenhouse effect is put into gear. One of the two energy fluxes. Unbalanced because some of the energy is recycled by the earth and its processes. Earth's energy output
Term
Radiation Fluxes
Definition
Measure of the flow of radiation from a given radioactive source
Term
Albedo
Definition
The fraction of solar radiation that is reflected from certain surfaces. On water varies due to angle of incidence. Higher latitude, lower albedo. Function of latitude. Albedo high at poles due to lots of snow and ice, and low angles of incidence on water. Seasonal changes affect because of more or less water.
Term
Latent Heat
Definition
Energy used in phase transition. Heat utilized to change water into different states and is carried upward.
Term

Sensible Heat

 

Definition
Direct warming from Earth. Use of convection through greenhouse effect. Rises upward.
Term
Clouds
Definition
Created by water vapor. Radiates and absorbs a certain amount of energy upward and downward. More clouds, more water vapor.
Term
aerosols
Definition
Microscopic liquid droplets, dust, or particulate matter that are airborne in the atmosphere. May remain in atmosphere for days or years depending on the type and location. They may reflect, or absorb incoming and outgoing radiation and impact atmostpheric energy and temperatures within surface and atmosphere. Decrease warming because reflect so effects of global warming are muted.
Term
Feedbacks
Definition
Positive and negative. Basically a cycle or processes that have cause and effect. 1 or great is positive feedback and less than one is negative feedback. Short-term feedbacks are usually positive and its runaway feedbacks that cause warming.
Term
Greenhouse effect
Definition
Trapping and recycling of heat. Results in a colling of lower atmosphere. Gases are Methane, Water Vapor, CFCs, and CO2
Term
Keeling Curve
Definition
CO2 vs. Time from 1956 to presetn. Shows the systematic rise in CO2 levels. Dips in curve are caused by N. Hemipheres summers where plants take in CO2.
Term
Mann's Hockey-Stick Curve
Definition
Combined proxy data to come up with curve. Starts at 1000 AD to present. Temperature vs. Time.
Term
Stratospheric Ozone Layer
Definition
Lies above troposphere. Lower stratosphere contains ozone layer which absorbs ultraviolet solar radiation warming surrouding atmosphere. Thinner ozone layer from CFCs results in a colder stratosphere because not absorbing radiation.
Term
Dust Fluxes
Definition
Contain wind shear and fertilization effects. Wind shear is the difference in wind speed and direction between slightly different altitudes and can determine whteher or not conditions are favorable for tropical cyclone developments.
Term
hydrologic cycle
Definition
The continuous movement of water on, above, and below surfaces of the Earth. Water changes states throughout this cycle. Ice, Water, and Vapor
Term
Hydroxyls
Definition
One oxygen and one hydrodgen molecule, OH-. Atmospheres detergent because transforms all manner of gaseous pollutants so that they become soluble in water and wash away in the rain. Called OXIDATION. Life span of a few seconds. Much higher in the tropics and produced by UV radiation.
Term
CO2 fertilization Effect
Definition
Could potentially prove to be a negative Co2 feedback. This is where CO2 is "fertilizes" plant growth. CO2 is taken in the photoshynthesis process converting the CO2 into oxygen.
Term
Asian Monsoons
Definition
Caused by land-sea thermal contrast which results in spatial variation in sensible heat fluxes and laten heat-flux. Warm water, cool land surface. Vice versa
Term
oceanic conveyor
Definition
model deep ocean circulation. Mostly in the atlantic. Carries oxygenated water to deep sea. As atmosphere warms less flux from ocean. Theorized by Wally Broecker.
Term
Wadham's Chimneys
Definition
Huge Whirlpools in N. Atlantic. Giant 'chimneys' in the sea where columns of cold, dense water were sinking from the surface to the seabed 3,000 metres below, but now they have almost disappeared. Maybe they are starting to stop circulating?
Term
Ocean Acidity
Definition
acidification is negative feedback. When this happens reduces the production of calcium carbonate so when these species die off, will slightly inrease the ocean's ability to take up CO2. Kills off coral reafs.
Term
Maunder Minimum
Definition
Name given to the period roughly from 1645 to 1715, when sunspots became exceedingly rare, as noted by solar observers of the time. Due to sunspot cycles.
Term
Earth's Orbital Cycles
Definition
precession, obliquity, and eccentricity. Eccentricity is the shape of the orbit Earth. Pulses back and forth. Obliquity or inclination is the tilt or angle of rotation. average is 23.5. Precession is the movement of the Earth's rotation around a cirlce. Pacemaker of the ice age.
Term
Okham's Razor
Definition
simplist explanation is most likely, shaving away unnessesary features.
Term
hyperweather
Definition
Because of warmer temperatures, creates extreme weather conditions.
Term
megadroughts
Definition
Drought that lasts for decades or centuries
Term
Anthropocene
Definition
Used by some scientists to describe the most recent period in the Earth's history. It has no precise start date, but may be considered to start in the late 18th century when the activities of humans first began to have a significant global impact on the Earth's climate and ecosystems.
Term
Climate Modes
Definition
Conatins Stable States and Tipping Points. Tipping points happen when climate goes from one stable state to another stable state. After tipping point, a transition to new state occurs.
Term
equilibrium line, zone of accumulation, zone of ablation
Definition
On a glacier, the accumulation zone is the area above the firn line, where snowfall accumulates and exceeds the losses from ablation, (melting, evaporation, and sublimation). The annual Glacier equilibrium line separates the accumulation and ablation zone annually. The accumulation zone is also defined as the part of a glacier’s surface, usually at higher elevations, on which there is net accumulation of snow, which subsequently turns into firn and then glacier ice.
Term
sea-level change
Definition
Increasing temperatures result in sea level rise by the thermal expansion of water and through the addition of water to the oceans from the melting of continental ice sheets. Has currently been on the rise for the past couple decades.
Term
Carbon cycle
Definition
Sum of processes includeing photosynthesis, decomp, respiration, weathering, and sedimentation by which carbon cycles betweent it major reservoirs, the atmosphere, living organisms, sediments, and rocks.
Term
Gaia
Definition
Hypothesis that says taht Earth is a homostasis system, self-controlling.
Term
Sahara
Definition
climate sensitive area which may see a vegetation sometime in the future if CO2 levels increase
Term
Svalbard/Spitzbergen
Definition
very climate sensitive area where the ice sheets are melting at a fairly high rate. A lot of research is done here to find out more about climate change. Northernmost colonization
Term
Artic sea ice
Definition
Significantly change their size during seasonal changes of the year. However, underlying this seasonal variation, there is an underlying trend of melting as part of a more general process of Arctic shrinkage.
Term
Antartic Ice Shelves
Definition

Wordie, Larsen, and Ross.

Floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface.

In the last several decades, glaciologists have observed consistent decreases in ice shelf extent through melt, calving, and complete disintegration of some shelves.

Term
Permafrost, melting-point isotherm, methane production
Definition
Release methane when melted
Term
Seafloor clathrates
Definition
Huge amounts of methane stored under the seafloor and when warmed, produce a great amount of methane that is released into the atmosphere.
Term
ice cores
Definition
core sample from the accumulation of snow and ice over many years that have re-crystallized and have trapped air bubbles from previous time periods. The composition of these ice cores, especially the presence of hydrogen and oxygen isotopes, provides a picture of the climate at the time.
Term
"snowball Earth"
Definition
refers to hypotheses regarding paleoclimatic global-scale glaciation, claiming that the Earth's surface was nearly or entirely frozen at some points in its past.
Term
Glacial-Intglacial Cycles
Definition
glacials for colder periods during ice ages and interglacials for the warmer periods. Periods of ice ages.
Term
Younger Dryas
Definition
also referred to as the Big Freeze,[1] was a geologically brief (approximately 1,300 ± 70 years) cold climate period following the Bölling/Allerød interstadial at the end of the Pleistocene between approximately 12,800 to 11,500 years ago,[2] and preceding the Preboreal of the early Holocene. Was a abrupt climate change.
Term
Medieval warm Period
Definition
was a time of warm climate in the North Atlantic region, lasting from about the tenth century to about the fourteenth century. It was followed by the a cooler period in the North Atlantic termed as the Little Ice Age. The MWP is often invoked in discussions of global warming. Some refer to the event as the Medieval Climatic Anomaly as this term emphasizes that effects other than temperature were importa
Term
Little Ice Age
Definition
was a period of cooling occurring after a warmer North Atlantic era known as the Medieval Warm Period. three minima with slight warming intervals.
Term
Volcanic eruptions
Definition

Toba and Tambora

Volcanic eruptions can enhance all three of these climate effects to variable degrees. They contribute to ozone depletion, as well as to both cooling and warming of the earth's atmosphere

 

Tambora known as year without a summer

Term
Heinrich Events
Definition
Variations in solar flux or solar energy output. Pulses or massive discharges create these events.
Term
Dansgaard-Oechger Cycles
Definition
Cycles in oxygen-isotope, water ocillations of the last ice ages. What the temp fluxes deal with.
Term
IPCC
Definition
Intergovernmental Panel on Climate Change. scientific intergovernmental body[1] tasked to evaluate the risk of climate change caused by human activity. Eventually led to Kyoto Protocol
Term
Kyoto Accord
Definition
an international environmental treaty produced at the United Nations Conference on treaty is intended to achieve "stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system
Term
Byrd Polar Research Institute
Definition

he Byrd Polar center at Ohio State University was established in 1960 as the Institute for Polar Studies. Research foci originally included geology, glaciology, and biology.

Famous for important studies with ice cores and climate change.

Term
Louis Agassiz
Definition
prominent innovator in the study of the earth's natural history
Term
James Croll
Definition
Linked Fluctuations to Earth's Orbit in the 1800s
Term
Svante Arrhenius
Definition
Calculated changes in CO2 and temperature and linked them
Term
Wally Broecker
Definition
Ocean Conveyer Belt
Term
Richard Alley
Definition
Focused on rapied warming or change called tipping point
Term
James Hansen
Definition
Bush's top climated modeler despite outspoken warnings about the climate
Term
Lonnie Thompson
Definition
Drilled low-latitude records. Ice cores and such
Term
James Lovelock
Definition
Popularized Gaia Theory
Term
Milutin Milankovitch
Definition
Calculated Orbital Paramters
Term
Paul Crutzen
Definition
Nobel Prize winner for his work with CFCs and destruction of ozone layer. Coined tern Anthropocene.
Supporting users have an ad free experience!