Weather and climate

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Notas de aula

Weather vs. Climate

Weather is the state of the atmosphere at a specific place and time, described by temperature, humidity, cloud cover, and stability.
Climate is the average of atmospheric conditions over a longer period of time.
Weather refers to day-to-day conditions, while climate describes long-term patterns.
Most weather phenomena occur in the troposphere, the lowest layer of the atmosphere.

Measuring Weather

Temperature is measured with a thermometer, usually in degrees Celsius (°C).
Precipitation (rain, snow, etc.) is measured with a rain gauge, typically in millimetres (mm).
Wind direction is measured with a wind vane, and wind speed with an anemometer.
Air pressure is measured with a barometer, often in millibars (mb) or hectopascals (hPa).

Types of Rainfall

Relief rainfall occurs when moist air is forced to rise over mountains, cooling and condensing to form clouds and rain on the windward side.
Convectional rainfall happens when the ground is heated strongly, causing air to rise rapidly, cool, and form tall cumulonimbus clouds with heavy showers.
Frontal rainfall is produced when a warm air mass meets a cold air mass; the warm air rises over the cold air, leading to prolonged rainfall.

Pressure Systems

High pressure (anticyclone) brings sinking air, clear skies, and calm conditions.
Low pressure (depression) brings rising air, cloud formation, and precipitation.
Air moves from high pressure to low pressure, creating wind.
The jet stream is a fast-moving band of air in the upper atmosphere that influences weather systems in the mid-latitudes.

Air Masses Affecting the UK

Polar maritime air masses come from the north Atlantic, bringing cool, moist air and frequent rain.
Tropical maritime air masses come from the south Atlantic, bringing warm, moist air and mild, cloudy weather.
Polar continental air masses come from the east, bringing cold, dry air in winter.
Tropical continental air masses come from the south, bringing hot, dry air in summer.

Factors Affecting Climate

Latitude: The higher the latitude, the lower the sun angle, so temperatures are cooler.
Altitude: Higher altitudes are cooler; temperature decreases with height (adiabatic lapse rate).
Distance from the sea: Coastal areas have smaller temperature ranges than inland areas because the sea heats and cools more slowly.
Prevailing winds: Winds from the sea bring moisture and moderate temperatures; winds from land bring drier conditions.

Reading a Climate Graph

A climate graph shows average monthly temperature as a line graph and average monthly precipitation as a bar chart.
The temperature scale is usually on the right, and the precipitation scale on the left.
The pattern of temperature shows the seasons: highest in summer, lowest in winter.
The pattern of precipitation shows wet and dry months.
Climate graphs help compare the climate of different places.

Slides

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CADASTRE-SE — GRÁTIS ENTRAR

Questões de prática

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1.Which term describes the day-to-day state of the atmosphere at a particular place, including its temperature, precipitation and cloud cover?
Easy
- AWeather
- BClimate
- CRelief
- DAltitude
2.In which layer of the atmosphere do almost all familiar weather phenomena, such as wind, cloud and rain, occur?
Easy
- ATroposphere
- BStratosphere
- CMesosphere
- DThermosphere
3.What is the main reason why places at higher altitude are usually cooler than places at lower altitude?
Medium
- AThey are farther from the Sun.
- BMost atmospheric heating comes from contact with the Earth's surface.
- CThey receive less rainfall.
- DThey are closer to the jet stream.
4.Which type of rainfall occurs when warm, moist air is forced to rise over a mountain barrier?
Medium
- ARelief rainfall
- BConvectional rainfall
- CFrontal rainfall
- DCyclonic rainfall
5.Which of the following is a human factor that can affect the climate of a place?
Medium
- ALatitude
- BAltitude
- CDistance from the sea
- DUrbanisation
6.What causes the seasons?
Medium
- AThe Earth's distance from the Sun changing during the year
- BThe tilt of the Earth's axis relative to its orbital plane
- CChanges in the Sun's energy output
- DThe movement of the jet stream
7.Which large-scale atmospheric circulation cell is located between the equator and about 30° latitude?
Medium
- AHadley cell
- BFerrel cell
- CPolar cell
- DJet stream
8.Which air mass affecting the UK brings cold, dry air from the north?
Medium
- APolar maritime
- BTropical continental
- CArctic maritime
- DTropical maritime

Mais perguntas

9.What is the name of the boundary between two air masses of different temperatures and densities?
Medium
- AFront
- BJet stream
- CIsobar
- DAnticyclone
10.Which of the following is a characteristic of a low-pressure system (depression) in the UK?
Hard
- AClear skies and calm conditions
- BSinking air and dry weather
- CRising air and unsettled, rainy weather
- DHigh temperatures and drought
11.Which instrument is used to measure atmospheric pressure?
Medium
- ABarometer
- BAnemometer
- CThermometer
- DRain gauge
12.What is the difference between weather and climate?
Medium
- AWeather refers to long-term averages, while climate refers to short-term conditions.
- BWeather refers to short-term conditions, while climate refers to long-term averages.
- CWeather is only about temperature, while climate is only about rainfall.
- DWeather occurs in the stratosphere, while climate occurs in the troposphere.
13.Which of the following are factors that affect the climate of a place? (Select all that apply.)
Medium
- ALatitude
- BAltitude
- CDistance from the sea
- DPrevailing winds
- EThe number of clouds on a particular day
14.Which of the following are types of rainfall? (Select all that apply.)
Medium
- ARelief rainfall
- BConvectional rainfall
- CFrontal rainfall
- DCyclonic rainfall
- EOrographic rainfall
15.Weather and climate mean the same thing.
Easy
True or false?
16.The Earth's axis is tilted relative to its orbital plane, and this tilt causes the seasons.
Easy
True or false?
17.Most weather phenomena occur in the stratosphere.
Medium
True or false?
18.Match each weather instrument with the weather element it measures.
Medium
- Thermometer
- Barometer
- Anemometer
- Rain gauge
- Temperature
- Atmospheric pressure
- Wind speed
- Precipitation
19.Match each air mass affecting the UK with the conditions it typically brings.
Medium
- Polar maritime
- Tropical continental
- Arctic maritime
- Tropical maritime
- Cold and wet
- Warm and dry
- Cold and dry
- Warm and wet
20.Put the stages of convectional rainfall in the correct order.
Medium
- The ground is heated strongly by the Sun.
- Warm, moist air rises rapidly.
- The air cools and water vapour condenses to form clouds.
- Heavy rain falls, often as a thunderstorm.
21.Put the stages of relief rainfall in the correct order.
Medium
- Moist air approaches a mountain range.
- The air is forced to rise over the mountains.
- The air cools and condenses, forming clouds and rain on the windward side.
- The air descends on the leeward side, becoming warmer and drier.
22.Why does the Northern Hemisphere receive more direct sunlight in June than in December?
Medium
- AThe Northern Hemisphere is tilted towards the Sun in June.
- BThe Earth is closer to the Sun in June.
- CThe Sun moves northwards in June.
- DThe Northern Hemisphere has less cloud cover in June.
23.Which factor is the main cause of the strong temperature contrast between polar and tropical air?
Medium
- ADifferences in latitude, which affect the angle of incoming sunlight.
- BDifferences in altitude between the poles and the tropics.
- CDifferences in ocean currents.
- DDifferences in vegetation cover.
24.Which of the following are consequences of the strong temperature contrast between polar and tropical air? (Select all that apply.)
Hard
- AThe formation of the Hadley cell
- BThe formation of the Ferrel cell
- CThe formation of the polar cell
- DThe formation of the jet stream
- EThe formation of the Great Red Spot on Jupiter
25.Higher altitudes are usually cooler than lower altitudes because most atmospheric heating comes from contact with the Earth's surface.
Easy
True or false?
26.What is a temperature inversion?
Medium
- AA situation where temperature increases with height instead of decreasing.
- BA situation where temperature decreases with height instead of increasing.
- CA situation where temperature stays the same with height.
- DA situation where temperature changes rapidly over a short horizontal distance.
27.How can a temperature inversion affect the weather?
Medium
- AIt can lead to the formation of fog and suppress thunderstorm development.
- BIt causes strong updrafts that form thunderstorms.
- CIt causes rapid cooling and snowfall.
- DIt increases wind speed at the surface.
28.Why do different surfaces (such as oceans, forests, ice sheets and human-made objects) cause local temperature differences?
Medium
- AThey have different physical characteristics such as reflectivity, roughness or moisture content.
- BThey are at different latitudes.
- CThey are at different altitudes.
- DThey receive different amounts of solar radiation due to the Earth's tilt.
29.Match each atmospheric circulation cell with its approximate latitude range.
Medium
- Hadley cell
- Ferrel cell
- Polar cell
- 0° to 30° latitude
- 30° to 60° latitude
- 60° to 90° latitude
30.
A weather station records these readings over four days:
Day Temperature (°C) Precipitation (mm)
Mon 12 0
Tue 13 0
Wed 11 18
Thu 12 2
Which statement is best supported by this evidence?
Medium
- AThe heaviest rainfall occurred on Wednesday.
- BThe climate of the site became wetter during the week.
- CTemperature fell steadily from Monday to Thursday.
- DThursday was the driest day of the week.
31.A student writes: 'The weather in my town is always the same in July, so the climate never changes.' Which criticism of this statement is most accurate?
Hard
- AIt confuses weather with climate: climate is the long-term average, so a single month cannot show that climate never changes.
- BIt is correct, because weather and climate are the same thing.
- CIt is wrong only because July is in the wrong season for measuring climate.
- DIt is wrong because climate changes every day, just like weather.
32.A climate graph for a coastal town shows a small annual temperature range: mild winters and cool summers. Which factor affecting climate best explains this pattern?
Medium
- ADistance from the sea
- BAltitude
- CLatitude
- DPrevailing winds from the north
33.A map shows a town at grid reference 456 789 on a 1:50,000 scale map. Which statements about using this map evidence are correct? (Select all that apply.)
Medium
- AThe first three digits (456) give the easting and the last three (789) give the northing.
- BA distance of 4 cm on the map represents 2 km on the ground at this scale.
- CGrid references are read along the corridor and up the stairs.
- DThe scale 1:50,000 means 1 cm on the map represents 50,000 km on the ground.
- EGrid references can be used to describe the location of a weather station.
34.A data table showing one day's temperature, rainfall and wind speed can be used to describe the climate of a place.
Medium
True or false?
35.Match each piece of evidence from a weather record with what it shows.
Medium
- Temperature falls from 15 °C at sea level to 8 °C at 1000 m
- A climate graph shows a small annual temperature range
- A map shows a town on the west coast of the UK
- A record shows 20 mm of rain in one hour
- The effect of altitude on temperature
- The effect of distance from the sea on climate
- The effect of prevailing winds on climate
- A short-term weather event, not a climate pattern
36.A student is given this extract: 'In June the Northern Hemisphere is tilted towards the Sun, so at any given Northern Hemisphere latitude sunlight falls more directly on that spot than in December.' Which conclusion is best supported by this evidence?
Hard
- AThe tilt of the Earth's axis causes the seasons.
- BThe Earth is closer to the Sun in June than in December.
- CThe Northern Hemisphere is always warmer than the Southern Hemisphere.
- DSunlight is spread over a greater surface area in June than in December.
37.Which layer of the atmosphere lies immediately above the troposphere?
Easy
- AStratosphere
- BMesosphere
- CThermosphere
- DExosphere
38.Which of the following is NOT a common weather phenomenon listed in the reference material?
Easy
- AEarthquake
- BWind
- CFog
- DDust storm
39.Which large-scale atmospheric circulation cell is located between about 30° and 60° latitude?
Medium
- AHadley cell
- BFerrel cell
- CPolar cell
- DJet stream
40.Most weather phenomena occur in the troposphere.
Easy
True or false?
41.What is the name of the lowest layer of the Earth's atmosphere, where most weather occurs?
Easy
42.What is the term for the long-term average of atmospheric conditions in a place?
Medium
43.According to the reference material, over how many years has Jupiter's Great Red Spot anticyclonic storm been known to exist?
Medium
44.Complete the sentence about the difference between weather and climate.
Easy
Weather is the state of the atmosphere at a specific place and time, whereas ____ is the averaging of atmospheric conditions over longer periods of time.
45.Name the three main types of rainfall.
Medium
The three main types of rainfall are ____, ____, and ____.
46.What is the name of the process by which the uneven heating of the Earth's surface leads to the formation of zones of temperature and moisture gradients?
Medium
47.For approximately how many years has Jupiter's Great Red Spot anticyclonic storm been known to exist?
Easy
48.Complete the sentence about the cause of seasons.
Medium
Because the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different ____ at different times of the year. In June the Northern Hemisphere is tilted ____ the Sun, so at any given Northern Hemisphere latitude sunlight falls more directly on that spot than in December.
49.Over how many years has Jupiter's Great Red Spot anticyclonic storm been known to exist? Give your answer as a number of years.
Easy
50.On Earth, surface temperatures usually range by how many degrees Celsius annually? Give your answer as a number.
Medium
51.Complete the sentence about the layers of the atmosphere.
Easy
Almost all familiar weather phenomena occur in the ____ , the lowest layer of the atmosphere, just below the ____ .
52.The temperature at sea level is 20 °C. If the air cools at the adiabatic lapse rate of 6.5 °C per 1000 m, what is the approximate temperature at 2000 m? Give your answer in °C.
Medium
53.Explain why places at higher altitude are usually cooler than places at lower altitude.
Hard
54.Explain how the uneven heating of the Earth's surface can lead to the formation of weather systems.
Hard
55.A climate graph for a mountain town shows that January temperatures are higher than those in the valley below. Explain how a temperature inversion can cause this.
Hard
56.According to the reference material, over how many years has Jupiter's Great Red Spot anticyclonic storm been known to exist?
Medium
- A330 years
- B270 years
- C300 years
- D360 years
57.For approximately how many years has Jupiter's Great Red Spot anticyclonic storm been known to exist?
Easy
- A300 years
- B330 years
- C360 years
- D270 years
58.Over how many years has Jupiter's Great Red Spot anticyclonic storm been known to exist? Give your answer as a number of years.
Easy
- A270 years
- B360 years
- C330 years
- D300 years
59.On Earth, surface temperatures usually range by how many degrees Celsius annually? Give your answer as a number.
Medium
- A72 °C
- B88 °C
- C80 °C
- D96 °C
60.The temperature at sea level is 20 °C. If the air cools at the adiabatic lapse rate of 6.5 °C per 1000 m, what is the approximate temperature at 2000 m? Give your answer in °C.
Medium
- A7 °C
- B8 °C
- C9 °C
- D6 °C

Resumos de revisão

## Weather and Climate - **Weather** = the state of the atmosphere at a **specific place and time** — day-to-day temperature, precipitation, humidity, cloud cover, stability. - **Climate** = the **averaging of atmospheric conditions over longer periods of time**. - Almost all familiar weather happens in the **troposphere**, the lowest layer of the atmosphere, just below the stratosphere. ## What Drives Weather - Weather is driven by **air pressure, temperature and moisture differences** between places. - These differences come from the **Sun's angle**, which varies with **latitude**: the farther from the tropics, the lower the sun angle, so sunlight spreads over a greater surface and it is cooler. - Strong temperature contrast between **polar and tropical air** creates large-scale circulation cells — the **Hadley cell, Ferrel cell, polar cell** — and the **jet stream**. - Mid-latitude weather systems (e.g. **extratropical cyclones**) are caused by **instabilities of the jet stream flow**. - Earth's axis is **tilted** relative to its orbital plane, so sunlight hits at different angles through the year — this causes the **seasons**. - **Surface temperature differences cause pressure differences.** - **Higher altitudes are cooler** than lower altitudes: most atmospheric heating comes from contact with Earth's surface, while radiative losses to space are mostly constant. - Sometimes temperature **increases with height** — an **inversion** — which can make mountaintops warmer than valleys, form **fog**, and suppress thunderstorms. ## Rainfall Types - **Relief rainfall** — air forced to rise over hills/mountains. - **Convectional rainfall** — air heated at the surface rises. - **Frontal rainfall** — warm air rises over cold air at a front. ## Pressure Systems - **High pressure** — sinking air; generally settled. - **Low pressure** — rising air; cloud and rain. ## Factors Affecting UK Climate - **Latitude** — sun angle and temperature. - **Altitude** — higher = cooler. - **Distance from the sea** — sea heats and cools more slowly than land. - **Prevailing winds** — bring the characteristics of the **air masses** they come from. ## Climate Graphs - A climate graph shows **average monthly temperature** (line) and **average monthly precipitation** (bars) for a place. - Read: months along the bottom, temperature and rainfall on the two vertical axes. ## Key Idea - Earth's weather system is a **chaotic system**: small changes in one part can grow to have large effects on the whole system. - **Weather forecasting** = applying science and technology to predict the state of the atmosphere for a future time and a given location.

Weather: The state of the Earth's atmosphere at a specific place and time, typically described in terms of temperature, humidity, cloud cover, and stability.
Climate: The averaging of atmospheric conditions over longer periods of time.
Troposphere: The lowest layer of the Earth's atmosphere, just below the stratosphere, where almost all familiar weather phenomena occur.
Air pressure: One of the main differences between places that drives weather, along with temperature and moisture.
Latitude: The position north or south of the equator; the Sun's angle varies with latitude, so the farther from the tropics, the lower the sun angle and the cooler the location.
Hadley cell, Ferrel cell, polar cell: The largest scale atmospheric circulation cells, caused by the strong temperature contrast between polar and tropical air.
Jet stream: A large-scale atmospheric flow caused by the temperature contrast between polar and tropical air; instabilities in it cause mid-latitude weather systems such as extratropical cyclones.
Extratropical cyclone: A mid-latitude weather system caused by instabilities of the jet stream flow.
Inversion: A situation where temperature increases with height; it can make mountaintops warmer than valleys, form fog, and suppress thunderstorm development.
Relief rainfall: Rainfall caused when air is forced to rise over hills or mountains.
Convectional rainfall: Rainfall caused when air heated at the surface rises.
Frontal rainfall: Rainfall caused when warm air rises over cold air at a front.
High pressure system: A pressure system with sinking air, generally bringing settled weather.
Low pressure system: A pressure system with rising air, bringing cloud and rain.
Air mass: A body of air with particular characteristics; prevailing winds bring the characteristics of the air masses they come from.
Weather forecasting: The application of science and technology to predict the state of the atmosphere for a future time and a given location.
Chaotic system: A system, such as Earth's weather system, in which small changes to one part can grow to have large effects on the system as a whole.

Flashcards

What is the difference between weather and climate?

Weather is the day-to-day state of the atmosphere at a specific place and time, while climate is the average of atmospheric conditions over a longer period.

In which layer of the atmosphere do most weather phenomena occur?

The troposphere, the lowest layer of the atmosphere just below the stratosphere.

What drives weather?

Weather is driven by differences in air pressure, temperature, and moisture between one place and another.

How does latitude affect the Sun's angle and temperature?

The farther from the tropics, the lower the Sun's angle, so sunlight spreads over a greater surface area, making those locations cooler.

What causes the seasons?

The tilt of Earth's axis relative to its orbital plane means sunlight hits at different angles at different times of the year.

What are the three main atmospheric circulation cells?

The Hadley cell, the Ferrel cell, and the polar cell.

What is the jet stream and what does it cause?

The jet stream is a fast-moving air current; instabilities in its flow cause weather systems in the mid-latitudes, such as extratropical cyclones.

Why are higher altitudes typically cooler than lower altitudes?

Most atmospheric heating comes from contact with Earth's surface, so as you go higher, there is less surface heating.

What is a temperature inversion?

A situation where temperature increases with height, which can make mountaintops warmer than valleys and can lead to fog.

What is relief rainfall?

Rainfall caused when air is forced to rise over hills or mountains, cools, condenses, and falls as rain on the windward side.

What is convectional rainfall?

Rainfall caused by the Sun heating the ground, making air rise, cool, condense, and form tall cumulonimbus clouds that produce heavy showers.

What is frontal rainfall?

Rainfall that occurs when a warm air mass meets a cold air mass, and the warm air rises over the cold air, cools, and condenses.

What is a high-pressure system?

An area where air is sinking, leading to clear skies and settled weather, often called an anticyclone.

What is a low-pressure system?

An area where air is rising, leading to cloud formation and precipitation, often called a depression.

What are air masses and how do they affect the UK?

Air masses are large bodies of air with specific temperature and moisture characteristics; they bring different weather to the UK depending on where they come from.

Name four factors that affect climate.

Latitude, altitude, distance from the sea, and prevailing winds.

How does distance from the sea affect climate?

The sea heats and cools more slowly than land, so coastal areas have milder winters and cooler summers than inland areas.

How do prevailing winds affect climate?

Prevailing winds bring the characteristics of the areas they blow over, such as warm air from the tropics or cold air from polar regions.

What is a climate graph?

A graph that shows average monthly temperature and precipitation for a location, used to identify climate patterns.

What instruments are used to measure temperature, precipitation, wind, and pressure?

Temperature is measured with a thermometer, precipitation with a rain gauge, wind with an anemometer and wind vane, and pressure with a barometer.

What is the typical annual temperature range on Earth's surface?

Temperatures usually range between about -40 °C and 40 °C annually.

Why is weather forecasting difficult?

Earth's weather system is chaotic, so small changes in one part can grow to have large effects on the system as a whole.

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Em breve

Day	Temperature (°C)	Precipitation (mm)
Mon	12	0
Tue	13	0
Wed	11	18
Thu	12	2