: Learning

The MET Office have issued weather warnings for fog for large parts of the UK today. Fog is dangerous when travelling because it causes poor visibility. Have you walked in a thick fog before? I’ve walked into a fog where I could only see about a foot to either side of me. It was thrilling, but I was on a long, even, mostly empty beach at the time. I wouldn’t have liked to be crossing roads or surrounded by obstacles I couldn’t see. 

Fog is made of water droplets smaller than rain drops. Some parts of the world use nets designed to capture the water droplets of fog, which provides a supply of water in areas that don’t see much rain. Some places call this ‘sky fishing’ or ‘stealing from the sky’. How much water do you think can be collected from fog? The MET Office website states that ‘if you were to fill an Olympic sized swimming pool with fog and then somehow condense it, you would be left with around 1.25 litres of water (or just over 2 pints).’ 

Do you know the difference between mist and fog? It’s visibility! The Met Office states that ‘If you can see more than 1,000 metres it's called mist, but if it is thicker and the visibility drops below 1,000 metres it's called fog.’ Mist and fog are both formed from water droplets collecting in the air, but mist is less dense (meaning an Olympic sized pool full of mist would provide less water when condensed) this means it can be seen through easier and is less likely to stick around for a long time. 

Fog can also be described as a cloud forming at ground level. This is because fog and clouds form in the same way. They are the result of warm, moist air being cooled. Water vapour in the air cools to form water droplets. For example, think about how the water vapour from a hot shower, clings to the cool glass of a mirror as condensation. Or, how on a cold day your breath forms a mist when you exhale, as your warm breath mixes with the cold air. Clouds form when warm, moist air meets with cooler air flows. Fog often forms when warm, moist air is cooled by cold surfaces. For this reason, fog is more common in autumn and winter when the ground is coldest. Except for coastal fog, which is more common when warm, moist summer air meets the cold surface of the sea. 

Water droplets in fog cause poor visibility by reflecting light, which can distort shapes and make it difficult to judge distances. The MET Office refers to thick fog when visibility is below 180m and dense fog when it’s below 50m (that’s the length of the Olympic sized pool we’ve been talking about!). It’s interesting to note that thicker fogs often form in industrial areas. This is because water droplets cling to tiny particles in the air. At the coast the water usually attaches to salt particles in the air. In industrial areas it’s often particles of air pollution that the water collects around. This means that industrial areas (which are usually the areas of highest air pollution) are more likely to see thicker fogs, because there are more particles in the air for the water to cling to. 

Fog that mixes with air pollution is often called smog (smoke fog). Smog can turn the sky green, yellow, red, brown, black or grey. It’s been a problem since the onset of the Industrial Revolution in the late 1700’s, which saw an increase in coal burning for industry (for example to fuel factories and steam trains). In December 1952 London saw what become known as ‘The Great Smog’, during which weather conditions trapped the smoke from coal fires and produced ideal conditions for the formation of a dense fog. Combined, this caused poor air quality that was extremely dangerous. The Clean Air Acts of 1956 and 1968 were a direct result of this, reducing emissions of black smoke. As a result, fewer smogs were reported in the UK in the following decades. 

However, since then something known as Photochemical smog (or summer fog) has become more common, especially in largely populated industrial cities with warm climates. This forms when sunlight reacts with pollution particles in the air (nitrogen oxides from car exhausts or coal burning and volatile organic compounds from gasoline, cleaning products and household aerosols). Photochemical smog is bad for our health and damaging to crops and plants. It forms without smoke or fog and is only named the same (smog) because the resulting haze is similar. 

So, what can we do? Well, raising awareness by talking to others about what you learn is key. That's why I'm writing this blog and telling you!  We can also think about how we can reduce chemicals in the atmosphere. We might choose to walk, cycle or get the bus rather than travel by car. We might choose natural household cleaners and detergents over chemical ones. It can be as simple as choosing a roll-on deodorant over a spray (aerosol) one. By talking about what we learn we can encourage others to sign petitions that raise awareness of issues like air quality and  to vote for politicians who show by their voting record that they take issues relating to climate seriously. There are lots of things that can be done, gaining an understanding of the problems and their causes is the first step. 

Let’s look at the weather observations sent in by schools this week. I wonder if anyone has mentioned the fog!

School comments:

Stanford in the Vale Primary School: It’s been a windy week and we have finally got to see two digit numbers with the temperatures finally. We can see spring is just around the corner with buds on the trees and snowdrops around the school grounds. We are checking our bulbs every day at the moment. 

Livingston Village Primary School: We noticed that all the bulbs have started to grow which are the daffodils. Last year’s daffodils have started growing too.

Irvinestown Primary School: We had snow this week!

Logan Primary School: We have some little green shoots in our plantpots

Sacred Heart Primary School – Omagh: Our bulbs are shooting in both the pots and the ground

St Mary's Primary School (Newry): Still no sight of flowers but the shoots are up for the leaves. 

Gavinburn Primary School: After all the rain last week the has been none at all this week and it has felt really cold.

Roseacre Primary Academy: WE can't wait for the flowers.

St Anne's Catholic Primary School – Knowsley: Other days not recorded as ground frozen and path slippery

Fleet Wood Lane Primary School: We are starting to take pictures of the bulbs because we can see the start of the daffodil flowers.

Hello bulb buddies,

What an interesting time to be studying and observing the weather! Most of you will have had frost and cold winds this last week. I've heard that many schools have had to close in January because of the effects of extreme weather conditions, such as ice and floods.  Even on days where schools were open, conditions in the school grounds may have meant you weren’t able to collect weather data.

It’s likely that you’ve heard people talking about weather warnings a lot recently. Weather warnings are released by the MET Office (the UK’s official weather service) and are colour coded (green, yellow, amber and red) to indicate how extreme the weather will be in different areas.

Green: weather is not expected to be extreme.

Yellow: possibility of extreme weather so you should be aware of it.

Amber (orange): strong chance of the weather effecting you in some way, so be prepared.

Red: extreme weather expected, plan ahead and follow the advice of the emergency services and local authorities.

The Met Office also use symbols to indicate what type of weather to expect. For example, the symbols to the right show (in order) a red warning for rain, green for wind, green for snow, amber for ice and green for fog. This means there will be heavy rain and that you should prepare for ice. Why not have a look at the Met Office website and see what the weather forecast is for where you live?

The Met Office warn us about bad weather so that we can prepare for it. This is because extreme weather (such as strong winds and ice) can cause difficulties and make it hard to travel. Roads and train lines can close, flights can be cancelled, and walking conditions can be dangerous.

What was the weather like where you live? If you weren’t able to collect weather records you can enter ‘no record’ on the online form, but please let me know in the comment section what the weather was like! You can also let me know how your plants are doing and whether they have begun to sprout!

Keep up the good work Bulb Buddies,

Professor Plant

Hi Bulb Buddies, 

I hope that planting day went well and that you are enjoying documenting weather data for our investigation. 

I want to say a big thank you to you all for your hard work on planting day. Together we planted over 18 thousand bulbs across the UK! Your fantastic planting day photos show that you had a great time.  

Weather records started on 1 November. There is a resource on the website with more information on keeping weather records. I’ve attached this here in case you haven’t already seen it. This resource helps you to answer important questions, such as why rainfall and temperature readings are important to our investigation into the effects of climate on the flowering dates of spring bulbs.  

Use your Weather Chart to log the rainfall and temperature every day that you are in school. At the end of each week, log into your Spring Bulbs account on the Amgueddfa Cymru – National Museum Wales website to enter your weekly readings. You can also leave comments or ask questions for me to answer in my next Blog. 

Let me know how you get on and remember that you can share photos via email or Twitter. 

Keep up the good work Bulb Buddies, 

Professor Plant 

Autumn sends us an invitation to pause and admire the beautiful trees that surround us. It lays a vibrant carpet of colourful leaves welcoming us into the woods. In this once in a year spectacle, we advise that you wear comfortable shoes, take slower steps and mindfully redirect your gaze up to the sky to contemplate our magnificent trees. 

In St. Fagans National Museum of History, you can find some of the most beautiful specimens of trees planted by the Victorians and Edwardians that shaped our beautiful gardens. 

This year we celebrate the 150^th anniversary of the Fern-leaved Beech (Fagus sylvatica ‘Aspleniifolia’) located in the terraced gardens of the castle. This magnificent and unusual specimen was planted in 1872 under the head gardener William Lewis. This cultivar was introduced in the UK in the early 1800’s and won the RHS Award of Garden Merit in 2002. The leaves are dark green and deeply serrated, turning golden before falling in autumn. This specimen has an impressive dark and smooth trunk with its girth measuring 3.67m in diameter. The Fern-leaved Beech is a Chimera, originated from a plant cell mutation of the Common Beech (Fagus sylvatica). An interesting fact is that occasionally some of the serrated leaves revert to the Beech leaf shape, when that happens it is advisable to remove the reverted branches as they tend to grow more vigorously than the cultivar.

Another magnificent feature that celebrates 150 years in St. Fagans is the row of London and Oriental Planes planted by William Lewis along the formal ponds overlooking the terraced gardens.  The London plane is a natural hybrid of the Oriental Plane and the American Plane. The Oriental (Platanus orientalis) and London Plane (Platanus x acerifolia) are distinguishable by their leaf shape with the Oriental Plane having more deeply lobed leaves. Many London planes were planted over 200 years ago in the squares of London, hence its common name. This tree can withstand high levels of pollution and was one of the few trees that could thrive in the soot-laden atmosphere of cities before the passing of the Clean Air Act in 1956. Did you know that this resilient tree can store around 7.423 kg of Carbon at maturity? Large trees like this play an important role in improving air quality by sequestering carbon dioxide, removing air pollutants and absorbing gases that are harmful to human health.

William Lewis was also responsible for the planting of the Pine Walk in 1870. This beautiful avenue of Black Pine (Pinus nigra) and Scots Pine (Pinus sylvestris) guides you through the path towards the old Orchard. These tall and majestic trees enclose the space resembling the walls of a Cathedral. The bark of the Black Pine is dark grey with ridges and the needles are longer than other Pines. The Scots Pine is the only Pine native to Britain, it has shorter and compact needles and a warm red upper bark. Unfortunately, in recent years we have lost some of our Pine trees, in order to preserve this historic feature, we have planted four new Black Pines along the path. 

As we take pleasure in admiring these magnificent trees in the present, we must thank some of the far-sighted people of the past who have gifted us with this wonderful legacy. Trees make our cities a more pleasant and healthy environment. They enhance biodiversity, reduce flood risk, improve air quality, provide shade, and reduce the urban heat island effect in summer months. If you would like to leave a valuable legacy for future generations, start by planting a tree.  

If you are visiting St. Fagans gardens this autumn, follow this Tree Walk Guide written by Dr. Mary Barkham to learn more about our outstanding tree collection. 

Hello Bulb Buddies,

Schools from across the UK will be planting their bulbs as close to 20 October as they can. 

Click here for activities and resources that will help you with this part of the project and with looking after your bulbs over the coming months. 

These resources will help you on planting day:

• Adopt your Bulb (an overview of the care your bulbs will need)

• Planting your Bulbs (guidelines for ensuring a fair experiment)

And these activities are fun to complete:

• Bulb Adoption Certificate

• Make Bulb Labels

Please read the resources as they contain important information. For example, do you know to label your pot so that you know which side the daffodil and crocus are planted?

Remember to take photos of your planting day to enter the Planting Day Competition. Do this by sharing your images on Twitter or via email. 

Keep an eye on Professor Plant's Twitter page to see how planting day goes for other schools.

Best of luck Bulb Buddies, let us know how you get on.

Professor Plant & Baby Bulb