Ch 7.6 Is our climate also changing on a local scale? Flashcards

1
Q

What are the changes in other weather elements because of climate change?

A
  1. Decrease in visibility.
  2. Decrease in relative humidity.
  3. Increase in cloud cover and rainfall.
  4. Decrease in the amount of sunshine received.
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2
Q

Explain why there is a change in decrease in visibility.

A
  1. Urban activities such as transport, power plants and manufacturing activities produce air pollutants like nitrogen oxide, sulphur dioxide, carbon dioxide and suspended particles. This causes high concentration of air pollutants which reduce visibility.
  2. Low wind speeds in urban areas cannot disperse air pollutants.
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3
Q

Explain why there is a decrease in relative humidity.

A
  1. Vegetation is removed for urban development -> Decrease in evapotranspiration.
  2. Wet surfaces are reclaimed for urban development -> Decrease in evapotranspiration.
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4
Q

Explain why there is an increase in cloud cover and rainfall.

A
  1. Higher air temperature -> Air heats up and rises.
  2. Tall building -> Wind rise higher up into the atmosphere. -> Rising air currents.
  3. High concentration of suspended particulates -> More condensation nuclei -> Favours formation of cloud.
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5
Q

Explain why is there a decrease in the amount of sunshine received.

A
  1. More clouds reflect more solar radiation back into space.
  2. High concentration of suspended particles scatter more solar radiation back into the space.
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6
Q

What are the negative impacts of climate change in Hong Kong (Rising sea levels)?

A
  1. Rising air temperature -> Rising sea levels -> More and severe strong storms -> Frequency and intensity of coastal flooding increase -> Low-lying areas such as North West New Territories -> Damage wildlife habitats such as Mai Po in the New Territories.
  2. Rising air temperature -> Rising sea levels -> More and severe strong storms-> Frequency and intensity of coastal flooding increase -> HK International Airport -> Disrupt external transport -> Economic losses
  3. Rising air temperature -> Rising sea levels -> More and severe strong storms -> Frequency and intensity of coastal flooding increase -> Business Districts such as CBD -> Disrupt economic activities. -> Economic losses.
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7
Q

What are the negative impacts of climate change in Hong Kong (Strong tropical cyclones)?

A

Rising air temperature -> Strong tropical cyclones ->More and severe storm surges.

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8
Q

What are the negative impacts of climate change in Hong Kong (Rising air temperature)?

A
  1. Rising sea levels.
  2. Strong tropical cyclones.
  3. Increased energy consumption for air conditioning.
  4. Increased risks of diseases like malaria, dengue fever and heatstrokes.
  5. Favour the development of smog -> Cause different health problems.
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9
Q

What are the negative impacts of climate change in Hong Kong (More frequent rainstorms)?

A

More frequent rainstorms -> Higher risk of landslides and flooding -> Damage buildings and infrastructure.

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10
Q

What are the negative impacts of climate change in Hong Kong (Higher seawater temperature)?

A

Higher seawater temperature -> Coral bleaching -> Damage wildlife habitats such as coral reefs in Sai Kung and Mai Po in New Territories.

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11
Q

What are the mitigation measures easing climate change in Hong Kong?

A
  1. Use energy resources with low GHG emissions.
  2. Promote low carbon transport.
  3. Increase energy efficiency in buildings and infrastructure.
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12
Q

Elaborate on use energy resources with low GHG emissions to ease climate change in Hong Kong.

A
  1. Phase down coal for electricity generation.
  2. Increase the share of natural gas.
  3. Adopt renewable energy resources such as installing solar panels on roods, buying excess solar power from the public and use landfill gas to produce energy.
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13
Q

Elaborate on promote low carbon transport to ease climate change in Hong Kong.

A
  1. Expand railways services to lower the energy used per passenger.
  2. Encourage the use of electric and hybrid cars.
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14
Q

Elaborate on increase energy efficiency in buildings and infrastructure.

A
  1. Promote rooftop and vertical greening to help lower air temperatures by transpiration and shading effect.
  2. Introduce district water cooling air conditioning systems to reduce the use of air conditioning.
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15
Q

What are the adaptation measures easing climate change in Hong Kong?

A
  1. Improve drainage management and flood control.
  2. Better urban designs.
  3. Build flood walls.
  4. Enhance slope safety.
  5. Protect and enhance ecosystems. IBBEP
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16
Q

Elaborate on how improving drainage management and flood control ease climate change in Hong Kong.

A
  1. Construct underground drainage systems.
  2. Construct storage tanks to prevent densely populated areas from flooding.
17
Q

Elaborate on how better urban designs ease climate change in Hong Kong.

A
  1. Construct rain garden to capture and filter rainwater.
  2. Build retention lake and storage lakes to capture and store storm water.
    All can decrease surface run off -> More water for future use.
  3. Construct porous pavement.
  4. Revitalise river channels to provide habitats to wildlife.
    All can increase infiltration -> More water stored for future use.
  5. New Development Areas are incorporated with blue green infrastructure.
18
Q

Elaborate on how build flood walls ease climate change in Hong Kong.

A

Build flood walls in low-lying coastal areas to prevent coastal flooding

19
Q

Elaborate on how enhance slope safety ease climate change in Hong Kong.

A
  1. Regularly check and maintain government slopes.
  2. Provide guidelines and advisory services of slope maintenance to private slopes.
20
Q

Elaborate on how protect and enhance ecosystems ease climate change in Hong Kong.

A
  1. Expand country parks and marine parks.
  2. Promote urban forestry to provide habitats for wildlife and help reduce heat island effect.