Study Notes on Climate and Weather

Introduction to Climate

  • Definition of climate: the long-term patterns of temperature, humidity, wind, and other atmospheric conditions in a particular area.

  • Importance: Understanding climate helps in predicting weather patterns, assessing environmental changes, and preparing for natural disasters.

The Physical Nature of Weather and Climate

  • Weather refers to the short-term atmospheric conditions at a specific time and place, while climate is the average of these conditions over longer periods.

  • Factors influencing weather and climate include: temperature, humidity, atmospheric pressure, and winds.

The Earth

  • Essential components: The Earth's tilt, rotation, and orbit around the sun significantly affect climate and weather patterns.

Three Ways the Tilt Affects Heating of the Earth

  • Period of Daylight

    • The tilt of the Earth causes variations in the length of day and night, influencing heating patterns. Longer daylight leads to more sunlight and warmer temperatures.

  • Solar Angle

    • The angle at which sunlight strikes the Earth's surface affects the intensity of solar radiation. Direct sunlight is more intense and leads to higher temperatures, while oblique angles result in lower temperatures.

  • Atmospheric Beam Depletion

    • As sunlight passes through the atmosphere, certain factors influence its intensity. The thicker the atmospheric layer, the more sunlight gets reflected and scattered, leading to diminished solar energy reaching the Earth’s surface.

Insolation at the Top of Atmosphere

  • Insolation, or incoming solar radiation, refers to the amount of solar energy received on a certain area of the Earth's surface over a specific time.

  • It is a crucial factor in determining the Earth’s climatic conditions.

Convection Cells

  • Simplified Convection Cells

    • Convection cells are the systematic movement of air due to the heating and cooling of the Earth's surface, leading to circulation patterns influencing weather.

  • Realistic Convection Cells

    • In realism, convection cells become more complex due to factors like geographical formations and atmospheric conditions.

Albedo

  • Definition: Albedo is a measure of the reflective property of a surface, indicating how much light or radiation is reflected without being absorbed.

  • Variations: Different surfaces have varying albedos; for example:

    • Ice reflects light and has a high albedo (reflectivity).

    • Water absorbs light/heat, leading to a lower albedo.

Homework

  • Reading Assignment:

    • Read ON Science 10, sections 7.1 (pages 266 - 288).

  • Questions: Complete problem set from ON Science 10, page 278, questions 1-6, and page 289, question 4.