Bishop 103, Earth's seasonality

Understanding Saturn

  • General Characteristics

    • Known as the "ring planet"

    • Takes 29 years to orbit the sun

    • A day in its rotation is approximately 10 hours

  • Seasonal Changes

    • Seasons can last up to 8 years

    • Unlike Jupiter, Saturn's seasons are influenced by its rings

    • Rings affect temperature and intense winds can decrease by up to 40% during certain points in its orbit

  • Storm Activity

    • Experiences intense storms typical of gas giants

Understanding Uranus

  • Unique Characteristics

    • Known as the "oddball" due to its extreme axial tilt of 98 degrees

    • Rings are oriented vertically, creating unique climatic and weather patterns

  • Day and Year

    • A typical day is approximately 17 hours

    • Takes 84 years to complete an orbit around the sun

  • Seasonality

    • Seasons are affected by the extreme tilt causing one side to constantly face the sun while the other remains in darkness

    • Resulting in drastic temperature changes and cloud formations

Understanding Venus

  • General Characteristics

    • Similar to Earth, yet vastly different due to its tilt of 177 degrees

    • Has the most extreme axial tilt in the solar system although it affects seasonality the least

Understanding Neptune

  • Axial Tilt

    • Tilt of 28.3 degrees, making Neptune's climatic variations significant yet not as drastic as Uranus

Comparison of Planetary Tilt and Seasonality

  • Extreme Tilt and Seasonality

    • Uranus with 97.7 degrees is notable, yet does not exhibit the most extreme seasonality

    • Venus's tilt, although extreme, has minimal seasonal impact due to its orientation

  • Illustration of Effects of Tilt

    • Comparing the effects of tilts to determine seasonality

    • Example: flipping Earth's poles and observing variations in weather effects

Hadley Cells and Global Climate Dynamics

  • Convective Current Performance

    • Driven primarily by solar radiation, causing air to warm, rise, and subsequently cool down as it reaches higher altitudes

  • Characteristics of Rising Air

    • Decreased pressure and lower temperatures as altitude increases

    • Water vapor capacity diminishes, leading to precipitation in areas where the sun strikes most directly

  • Desert Formation

    • Cold, dry air at 30 degrees North and South lead to desert conditions

    • Explanation: Sinking cold air warms and extracts moisture from land, contributing to desert climates

Seasonal Weather Dynamics

  • Global Distribution of Hadley Cells

    • Center tracks directly over the solar equator, moving with solar intensity throughout the year

    • Shifts during solstices:

    • June Solstice: Northern hemisphere tilt, Hadley cell center shifts towards 23.5 degrees North (Tropic of Cancer)

    • December Solstice: Hadley cell center shifts to 23.5 degrees South (Tropic of Capricorn)

  • Questions for Reflection

    • Would Hadley cells exist without planetary tilt?

    • What happens to the cell locations during equinoxes?

Rain Shadow Effect

  • Definition

    • A phenomenon that occurs when a mountain range lifts moist air, causing precipitation on the windward side and creating arid conditions on the leeward side

  • Ingredients for Rain Shadow

    • Presence of mountain ranges near coastal areas

    • Adequate moisture from off ocean winds encountered by the mountains

  • Precipitation Patterns

    • Windward side: wet and lush with high precipitation

    • Leeward side: arid and dry due to the lack of moisture

  • Example

    • Sierra Nevada mountains in California serve as a classic example of the rain shadow effect, with differing precipitation rates on each side:

    • High precipitation on windward side (>100 cm)

    • Low precipitation on leeward side (~35 cm)

  • Personal Context

    • Local annual precipitation in Albany: approximately 39.35 inches; compared to precipitation levels in nearby areas illustrating the rain shadow effect