albedo
Let an agent state albedo with its type, wavelength range and source, and use it correctly in climate and astronomy.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent state albedo with its type, wavelength range and source, and use it correctly in climate and astronomy.
The fraction of incident light or radiation that a surface or body reflects, from 0 (perfect absorber) to 1 (perfect reflector), with variants such as Bond albedo and geometric albedo.
What it is for: Describing reflectivity of surfaces, planets and snow, and its role in climate.
It can be measure it by satellites and instruments; compare surfaces; use it in climate and energy models; estimate sizes of asteroids from brightness.
Distinguishing features
Ratio of reflected to incident radiation
Depends on wavelength and angle
Different definitions in astronomy
Key feedback in climate
What it looks like
Not visible as such; bright surfaces like snow have high albedo, dark ones like forests low.
Physical character
fresh snow: 0.8-0.9 dimensionless
ocean: about 0.06 dimensionless
Earth average: about 0.3 dimensionless - Bond albedo
How it is recognised
Values between 0 and 1
Types such as Bond or geometric albedo
Satellite albedo maps
Related models
is a kind of - dimensionless quantity
affects - feedback
is used for - astronomy
is measured by - remote sensing
In practice
Families and kinds
Bond albedo
geometric albedo
surface albedo
spectral albedo
Failure modes and hazards
Mixing albedo types
Ignoring wavelength dependence
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Definition Which albedo.
Type must be stated.
Type
Bond, geometric, surface.
Type
Albedo type.
- Which albedo type is meant? definition
- Over which wavelengths? definition
Value
Number.
Value
The value.
- What is the albedo value? measurement
- From which source? provenance
Measurement How measured.
Methods affect values.
Method
Satellite or ground.
Method
Measurement method.
- How was it measured? provenance
- Under which illumination? definition
Uncertainty
Error.
Uncertainty
Uncertainty.
- What is the uncertainty? measurement
- How does it vary seasonally? measurement
Climate Role in climate.
Albedo changes affect warming.
Feedback
Ice-albedo feedback.
Feedback
Climate feedback.
- How does albedo change affect climate here? definition
- What does IPCC assess? provenance
Interventions
Cool roofs.
Interventions
Albedo interventions.
- Do cool roofs or other interventions change albedo usefully? measurement
- What are the trade-offs? boundary
Astronomy Planets and asteroids.
Albedo helps estimate sizes.
Size estimates
From brightness.
Size
Size estimates.
- How does albedo affect size estimates of small bodies? definition
- How uncertain are they? measurement
Planets
Planetary albedo.
Planets
Planetary albedo.
- What is the albedo of this planet or moon? measurement
- Which mission measured it? provenance
What the second pass must settle
- Should albedo types be separate entries?
- How should wavelength bands be recorded?
- How should satellite products be linked?