Study Notes on Solar Radiation and Energy Balance

Course Overview

• Instructor: Faiaz Khaled, PhD

• University: Texas Tech University

• Course: ATMO 1300: Introduction to Atmospheric Science

• Key Dates:

  • Exam schedules: Exam 1 on Mar 6, Exam 2 during finals week (May 7-12)

Energy Concepts

• Types of Energy:

  • Kinetic Energy: energy of motion

  • Potential Energy: stored energy

Temperature and Heat Transfer

• Temperature: Measure of hotness or coldness; relates to molecular motion

• Heat: Transfer of energy due to temperature differences

  • Heat Transfer Mechanisms:

  • Conduction: Direct molecule-to-molecule transfer

  • Convection: Fluid movement transfers heat

  • Radiation: Transfer through electromagnetic waves

• Latent Heat: Energy absorbed/released during phase changes (solid, liquid, gas)

Radiation Fundamentals

• Radiation: Emission of energy as electromagnetic waves. All objects emit radiation dependent on temperature.

  • Wavelength/Categories:

  • Ultraviolet, Visible, Infrared, etc.

• Stefan-Boltzmann Law: $I = \sigma T^4$; Intensity is proportional to the fourth power of temperature.

• Wien's Law: Shorter wavelengths correlate with higher temperatures.

Earth's Seasons and Solar Radiation

• Solar Angle: Affects intensity and duration of sunlight; higher angles result in more concentrated energy

• Seasonal Changes: Result from Earth's axial tilt (23.5°) and position in orbit around the Sun.

  • Solstices: June (summer in Northern Hemisphere), December (winter)

  • Equinoxes: March and September, equal day/night length globally

• Solar Constant: Amount of solar radiation received by Earth

Conclusion

• Understanding energy balance and solar radiation is crucial for comprehending atmospheric phenomena and climate variations.