Environmental Systems and Climate Feedbacks
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Questions and Answers

What is the latitude of the subsolar point also known as?

  • Solar altitude
  • Solar declination (correct)
  • Circle of illumination
  • Tropic of Cancer

    • Which layer of the atmosphere is known for containing 80% of the atmosphere's mass?

  • Thermosphere
  • Troposphere (correct)
  • Stratosphere
  • Mesosphere

    • What occurs as a result of the changing solar altitude and length of daylight hours?

  • Greenhouse effect
  • Earth’s seasonality (correct)
  • Atmospheric absorption
  • Air pressure dynamics

    • What is the term for the line that separates day from night?

    <p>Circle of illumination</p> Signup and view all the answers

    What phenomenon keeps Earth's average temperature higher than it would be if Earth was a blackbody?

    <p>Greenhouse effect</p> Signup and view all the answers

    How does air density change with height in the atmosphere?

    <p>Decreases exponentially with height</p> Signup and view all the answers

    What primarily comprises the troposphere?

    <p>Layer with the most aerosols</p> Signup and view all the answers

    What is atmospheric absorption?

    <p>The absorption of radiation that heats atmospheric constituents</p> Signup and view all the answers

    What is the primary function of a forest in environmental systems?

    <p>Storing carbon and producing oxygen</p> Signup and view all the answers

    Which type of feedback in environmental systems tends to amplify disturbances?

    <p>Positive feedback</p> Signup and view all the answers

    What signifies a stable state in an ecological system?

    <p>Negative feedback dominates</p> Signup and view all the answers

    Which of the following describes a dynamic equilibrium in environmental systems?

    <p>Inputs and outputs fluctuate within a narrow range</p> Signup and view all the answers

    What happens when a climate tipping point is reached?

    <p>A new state of equilibrium is reached</p> Signup and view all the answers

    Which statement describes the current state of the Earth system?

    <p>It is absorbing more radiation than it is emitting</p> Signup and view all the answers

    How do anthropogenic activities affect ecological systems?

    <p>They force systems to change states</p> Signup and view all the answers

    What does the ice-albedo feedback mechanism illustrate?

    <p>The impact of temperature increases on ice melting</p> Signup and view all the answers

    What is the solar constant, and what does it represent?

    <p>The average value of solar insolation received by Earth at its average distance from the sun.</p> Signup and view all the answers

    Which effect explains why the Earth receives different amounts of solar radiation at various latitudes?

    <p>Tilt of Earth's axis.</p> Signup and view all the answers

    Which statement regarding hot and cold objects is correct?

    <p>Hotter objects emit shorter wavelengths and more energy.</p> Signup and view all the answers

    What is the primary reason for variations in insolation throughout the year?

    <p>Earth's axial tilt.</p> Signup and view all the answers

    What process uses photosynthetically active radiation (PAR)?

    <p>Photosynthesis in green plants.</p> Signup and view all the answers

    How does the concept of 'sphericity of the Earth' affect insolation?

    <p>It causes uneven distribution of insolation from pole to pole.</p> Signup and view all the answers

    What role does the subsolar point play in solar energy distribution?

    <p>It's where the sun's rays are perpendicular to the Earth's surface.</p> Signup and view all the answers

    What is the primary characteristic of terrestrial longwave radiation emitted by Earth?

    <p>It is predominantly emitted at night.</p> Signup and view all the answers

    What is the main effect of deforestation on interception?

    <p>It reduces interception because more water reaches the soil surface.</p> Signup and view all the answers

    How does deforestation influence transpiration rates?

    <p>Transpiration rates decrease because of fewer roots.</p> Signup and view all the answers

    What occurs when rainfall intensity exceeds infiltration capacity?

    <p>Excess water produces surface runoff.</p> Signup and view all the answers

    What characterizes a gaining stream?

    <p>Its base flow is supported by a high water table.</p> Signup and view all the answers

    What is a defining feature of the urban heat island (UHI) effect?

    <p>Urban areas tend to retain more heat due to built structures and activities.</p> Signup and view all the answers

    How does urbanization typically affect runoff patterns?

    <p>Runoff increases due to impervious surfaces.</p> Signup and view all the answers

    What hydrologic effect was observed in the Hubbard Brook catchment due to deforestation?

    <p>Greater runoff was noted.</p> Signup and view all the answers

    Which statement about flow paths after deforestation is true?

    <p>Flow paths become more direct and efficient.</p> Signup and view all the answers

    What is one consequence of increased impervious areas in urban environments?

    <p>Increased peak runoff and flood risk</p> Signup and view all the answers

    How does El Niño affect global weather patterns?

    <p>It leads to a reversal of trade winds, reducing warm water upwelling</p> Signup and view all the answers

    What typically occurs during urbanization regarding water runoff?

    <p>Faster discharge and peak runoff</p> Signup and view all the answers

    What effect does decreased water availability have in urban areas?

    <p>Overall decrease in water resources</p> Signup and view all the answers

    What is the impact of sewerage systems on water flow in urban areas?

    <p>They decrease subsurface flow and lower the water table</p> Signup and view all the answers

    Study Notes

    Environmental Systems

    • Functions: Processes within a system, like carbon storage in forests.
    • Scale: Time and space dimensions impacting system behavior.
    • Feedbacks: Amplification or dampening of initial disturbances within a system.
      • Positive Feedback: Enhances initial change, pushing system to a new state (e.g., global warming).
      • Negative Feedback: Dampens change, bringing system back to original state.
    • Equilibrium States: Steady-state (inputs ≈ outputs) and dynamic equilibrium (inputs < or > outputs).
      • Stable States: Dominated by negative feedback.
      • Unstable States: Dominated by positive feedback.
      • Equilibrium States: Can be stable or unstable, influencing system behavior.
    • Climate Tipping Points: Thresholds that trigger dramatic change into a new state (e.g., permafrost thawing).

    Solar Radiation and the Atmosphere

    • Electromagnetic Radiation: Radiant energy emitted by objects with temperature above absolute zero.
    • Shortwave Radiation: Emitted by hotter objects (e.g., Sun).
    • Longwave Radiation: Emitted by cooler objects (e.g., Earth).
    • Solar Constant: Average solar radiation Earth receives at its average distance from the Sun (1370 W/m²).
    • Photosynthetically Active Radiation (PAR): Radiation used for photosynthesis by plants.
    • Earth's Tilt: Causes seasonal variation in daylight hours and solar radiation received at different latitudes.
    • Subsolar Point: Point where Sun's rays are perpendicular to Earth's surface.
    • Circle of Illumination: Line separating day and night.
    • Solar Altitude: Angle of the Sun above the horizon, varying from equator to poles.
    • Atmospheric Transmission: Passage of shortwave and longwave radiation through the atmosphere.
    • Atmospheric Scattering/Reflection: Redirection of radiation through interactions with atmospheric particles.
    • Atmospheric Absorption: Absorption of radiation by atmospheric constituents, causing heating.
    • Greenhouse Effect: Warming of Earth's surface due to absorption of longwave radiation by greenhouse gases in the atmosphere.
    • Air Density: Amount of gas molecules in a given volume, decreasing exponentially with height.
    • Air Pressure: Weight of the atmosphere above a point, decreasing exponentially with height.

    Atmospheric Layers

    • Troposphere: Lowest layer of the atmosphere, where all weather occurs.
      • Contains 80% of the atmosphere's mass.
      • Highest water vapor content and aerosol concentration.
    • Environmental Lapse Rate: Rate of cooling with increasing altitude in the troposphere.

    Deforestation & Hydrology

    • Deforestation significantly impacts hydrology and microclimate.
    • Hydrological Effects:
      • Reduced interception: More water reaches the soil surface.
      • Reduced transpiration: Fewer trees, leading to lower transpiration rates.
      • Increased runoff: More water flowing off the land surface.
    • Microclimate Effects:
      • Higher temperatures due to reduced evapotranspiration and increased solar radiation absorption.
      • Altered wind patterns, influencing cloud formation.
      • Creation of urban heat islands.

    Urban Heat Island Effect (UHI)

    • Urban areas experience higher temperatures than surrounding rural areas.
    • Causes:
      • Reduced evapotranspiration.
      • Increased heat absorption by impervious surfaces (e.g., roads, buildings).
      • Urban energy balance equation reflects these factors.

    Urbanization and Hydrology

    • Urbanization alters hydrological processes:
      • Increased impervious areas (roads, buildings) lead to overland flow.
      • Sewer systems increase subsurface flow and lower the water table.
      • These changes result in:
        • Increased peak runoff (floods).
        • Decreased low flow runoff.
        • Creation of urban rivers.
        • Faster discharge (response) peaking earlier.

    El Niño

    • El Niño is a climate pattern characterized by warmer-than-average sea surface temperatures in the central and eastern Pacific Ocean.
    • Causes:
      • Reversal of trade wind patterns.
      • Reduced upwelling of cold water.
    • Impacts:
      • Altered rainfall patterns in the tropics, leading to increased risks of floods.
      • Changes in atmospheric circulation affecting weather patterns worldwide.

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    GEOG 203 Lecture 2 - Environmental Systems - PDF

    Description

    Explore the intricate functions of environmental systems, including processes like carbon storage and the impacts of scale on system behavior. Understand feedback mechanisms and equilibrium states, and delve into critical climate tipping points that influence environmental dynamics.

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