Solar Radiation, Albedo, and Solar Radiation, Albedo, and Light Transmission in Light Transmission in

SeawaterSeawater

Objectives: To examine how Objectives: To examine how the sun’s energy affects the the sun’s energy affects the

ocean environmentocean environment

The Earth’s revolution The Earth’s revolution around the sunaround the sun

Equinoxes and solsticesEquinoxes and solstices

Exercise #1 – Solar Exercise #1 – Solar ConstantConstant

• Set the equator to the same height Set the equator to the same height as your light by using the meter stickas your light by using the meter stick

• Measure using the Lux MeterMeasure using the Lux Meter– Lux meters have different settings (x1, Lux meters have different settings (x1,

x10, x100)x10, x100)– Hold it flat to the globe for all readingsHold it flat to the globe for all readings

Sun’s rays and surface areaSun’s rays and surface area

Exercise #2 – LatitudeExercise #2 – Latitude

• Latitude lines are parallel to the Latitude lines are parallel to the equator.equator.

• Keep Lux meter flat to the globe.Keep Lux meter flat to the globe.

• When answering your questions, be When answering your questions, be sure to move the globe and take new sure to move the globe and take new measurements.measurements.

Execise 3# - AlbedoExecise 3# - Albedo

• The incoming radiation will be the same The incoming radiation will be the same for every sample.for every sample.

• Do not move or change the set-up without Do not move or change the set-up without asking the TA, only change out the sample asking the TA, only change out the sample trays.trays.

• Ask the TA for an Ice sample to measure. Ask the TA for an Ice sample to measure. Ice doesn’t have a dark sand bottom.Ice doesn’t have a dark sand bottom.

• Best to answer question in the way it Best to answer question in the way it SHOULD be, not the way your results SHOULD be, not the way your results suggest.suggest.

Exercise #4 – Visible light in Exercise #4 – Visible light in WaterWater

• Be sure that the light is in the middle Be sure that the light is in the middle depth of water.depth of water.

• Different ways to measure it?Different ways to measure it?

• Red should have lowest transmissionRed should have lowest transmission

• Best to answer question in the way it Best to answer question in the way it SHOULD be, not the way your results SHOULD be, not the way your results suggest.suggest.

Exercise #5&6– Settling of Exercise #5&6– Settling of particlesparticles

• Start with 2.4 gms. powdered silicaStart with 2.4 gms. powdered silica

• Be sure to add an additional 1.2 g Be sure to add an additional 1.2 g each time . each time .

• You must put your own scale into the You must put your own scale into the forms.forms.

• Stir thoroughly when required.Stir thoroughly when required.