Global Warming Whitewash Proposed November 6, 2009

http://www.earthweek.com/2009/ew091106/ew091106c.html

Yerupaja mountain in the high Andes may be one area to be painted white after glaciers melt.

A Peruvian scientist told his country’s parliamentary commission on climate change that global warming could be combated by painting highly reflective white paint over rock and ground exposed by receding glaciers.

Eduardo Gold, president of Glaciers of Peru, says reflecting the sunlight would keep the ground from absorbing as much solar radiation.

He proposes using only environmentally friendly lime-based paint made without harmful chemicals.

His scheme has drawn interest from the World Bank, which is considering various “geoengineering” proposals to counter climate change.

Gold says hiring local residents to do the landscape painting could create about 15,000 jobs.

The glaciers of the tropical Andes have proven to be very sensitive to climate change.

Some scientists have estimated a loss in coverage of more than 30 percent over the past 30 years.

Are The Alps Growing Or Shrinking?

Remember on the 9th or 10th of November I said the Alps were no longer grwoing due to plate tectonics. When I first read the article below, I thought I had made a mistake, but on closer inspection, I found I wasn’t!

From http://www.sciencedaily.com/releases/2009/11/091105121207.htm

ScienceDaily (Nov. 6, 2009) — The Alps are growing just as quickly in height as they are shrinking. This paradoxical result comes from a new study by a group of German and Swiss geoscientists.

The formation of the Alps through the collision of the two continents Africa and Europe began about approximately 55 million years ago. This led to the upthrusting of the highest European mountains, which probably already achieved its greatest height some millions of years ago. At present, however, the Swiss Alps are no longer growing as a result of this tectonic process.

But Swiss geodesists, who have already been measuring the Alps with highest accuracy for decades, have observed, however, that the Alp summits, as compared to low land, rise up to one millimetre per year. Over millions of years a considerable height would have to result. But why then are the Alps not as high as the Himalayas? This is because the  mountains eroded at almost exactly the same speed as they were being built.

How does it come about now that the Alps erode at the same speed that they rise? “Here pure upthrusting forces are at work. It is similar to an iceberg in the sea. If the top melts, the iceberg surfaces out of the water  increases by almost the same share,” explains von Blanckenburg.

Thus this paradoxical situation with the Alps that through wind, water, glaciers and rock fall, they are being constantly finely eroded from the top but on the other hand, regenerated from the Earth’s mantle. This phenomenon, even if already postulated theoretically has now been proven for a complete mountain range for the first time.

Thus, the Alps are constantly rising, although they have been deemed “dead” in a tectonic sense ( because they plate movements have ceased a long time ago). Instead of plate forces it is the strong climatic variations since the beginning of the so-called quaternary glacial before approximately 2.5 million years, to which mountain slopes in particular have been reacting so sensitively. This holds the Alps in motion.

Think ships: if you laden a ship with a heavy load, it sinks down low in the water. If you take out some of the cargo then the ship will rise up higher in the water. But if the stuff you remove from the ship is only from the top deck, the height of ship + cargo will get less, but the height of ship above the water will be about the same as it was before.

What in effect they are saying is imagine the Alps as a piece of crust ‘floating ‘ on the mantle. As the mountain tops are eroded, the overall mass decreases and so the Alps ‘float’ higher than before.

September 30: Indonesian Quake Damages Java Homes

More than a thousand Sumatrans were dead in the wake of two strong earthquakes in as many days. Officials believe the death toll will rise further.

The initial quake registered a magnitude of 7.6 late Wednesday afternoon as it wrecked homes and other buildings, including hospitals, in the city of Padang.

The shaking also sparked fires and broke water mains, causing streets to flood across the city.

Thousands of victims were feared still buried beneath the rubble two days after the first quake struck.

Earthquake strikes southern Iran

An earthquake has struck southern Iran, with hundreds of people suffering injuries, a state news agency says.

There are no reported deaths but about 100 people needed hospital treatment, the Irna news agency said. The 4.9-magnitude quake in Bandar Abbas sent people streaming into open spaces and cut power cables in the city.

Iran straddles a major geological fault line, making it prone to tremors. In 2008, seven people were killed in an earthquake in the same region. On average one earthquake hits the country each day, although most are minor tremors and are often in sparsely populated regions.

Making the most of the water you have

 

 

 

 

 

 

 

 

 

For more about it: http://news.bbc.co.uk/1/hi/world/americas/8297276.stm

Fieldwork in Wales Day 3

Here are the the tables of data I collected

This is the water quality data

This is the velocity chart: reember the velocity calculation  = distance (10 metres)/time

This is the width, depth, estimated cross-sections, and discharge data – the cross-section estimate I used was

1/2 x width x depth; the discharge = x section x vel

My next job is to find a good way to present these graphically – it will not look as neat on a blog  as it would in a word doc. but I will see what I can do!

Fieldwork in Wales day 2 1/2

Methods

Water quality:

Temperature:

What was needed: Thermometers strips,  0.5 m of down pipe as explained below, watch with second hand.

The 2 thermometers (one low and one high temperature) were both on sticky backed strips. These were stuck to the bottom edge of a piece of down pipe. The thermometers needed to be kept 10 cm below the surface of the water for 1 minute. So a tape was fixed 10cm from the end of the pipe with the thermometers on, that gave the level and keep the hands dry (and warm). The down pipe was lowered into the water until it reached the level of the tape and timed for I minute. The temperature was recorded.  The thermometer strips showed temperatures rising in gaps of 2. If 3 strips were highlighted, the middle one was recorded. If 2 adjacent number bars were highlighted equally, the average of the pair was recorded.

Dissolved oxygen

What was needed: chemical test tablet, the small tube from the kit, a watch with a second hand, the conversion chart for ppm (parts per million) against temperature.

The small bottle was filled up to the top with water. 2 tablets were added. The bottle was left for 5 minutes. The colour was tested against the colour chart and recorded. Using the conversion chart, the ppm was also recorded.

pH

What was needed: chemical test tablets,  a tube with lid provided in the kit, colour chart.

A sample of water enough to fill tube to the 10ml marker was collected from the river. 1 testing tablet was added and the top was placed on the bottle. It was shaken until the tablet had dissolved and then the colour was checked against the colour chart and the pH was recorded.

Turbidity

What was needed: turbidity disc, container from the kit, comparison chart.

The disc was fixed to the bottom of the container. The water was taken from the river to fill the container and the visibility of the disc was assessed by comparison with the chart. The result was recorded.

The velocity of the river:

What was needed: a supply of aging oranges free from the veg shop, a 30m tape, a stop watch, a fishing net to catch the oranges.

A 10 metre distance was measured along the river bank. The start and the finish was marked. 3 oranges were dropped in the river in different spots across it. This was because it was obvious that the water passing through in different parts of the river varied in velocity and so to get a full range gave a better estimate of the average surface velocity.

The time taken to go from start to finish was recorded. The oranges were hopefully caught after they had passed the finish. Using velocity = distance/ time, the velocity was estimated and recorded. Then the average surface velocity could be found by adding the 3 results and dividing by 3.

The width, depth and cross-section of a river, discharge:

What was needed: the down pipe (to measure depth), the tape (to measure width), velocity measurements

The width was measure using the tape. By exploration, the maximum depth, along the line where the width was measured was also recorded. These 2, given the narrow width of the river, was seen as sufficient to estimate the cross section

Triangle A = ½ small base x depth

Triangle B = ½ long base x height

Total cross-section area estimate = ½ small base x depth + ½ long base x height

= ½ height ( short base + long base) = ½ height x width

Discharge = velocity (average) x total cross-section estimate

Fieldwork in Wales Day 2

I could not really say what I expected until I got there. But here is the general theory about each variable and what I expected. Tomorrow, I will tell what we actually found!

Temperature

Water is slower to warm and slower to cool than the land. The air temperature above the land is affected by the land temperature below it.

What I am expecting:

Hypothesis 1: The temperature will remain the same at all sites

So given this was a pleasant mild day, I would anticipate that the water temperature would be a bit lower than their temperature. There is no other sources of warmth along Nant Gwynllyn so I would not expect any peaks or troughs anywhere along the river. So all sites would probably be the about the same as each other and would be a few degrees below the air temperature.

Dissolved Oxygen (DO)*

The lower the temperature the more oxygen can dissolve in the water before it becomes saturated.

Dissolved oxygen needs to be high enough to support animal life. The amount of oxygen in a sample can be affected by a number of different circumstances

Certain water bodies, like swamps, naturally have low levels of dissolved in the water. This is because decaying matter uses a lot of oxygen during decomposition – or more accurately the micro-organisms that break down the decaying matter use up much of the oxygen in the process. Many rivers do not have a single source, but ooze out of boggy areas, which can lead lower dissolved oxygen levels.
Much of the oxygen in water comes from plants during photosynthesis so the presence of plants would indicate higher oxygen levels. The amount plants add vary with the time of day. During the day they are adding to the DO but once the sun goes down, photosynthesis stops and respiration takes over as the main plant process, so they like the animals use up the dissolved oxygen.

Oxygen from air as wind blows across the water’s surface and can add to the overall level as can the presence of ‘white water’ as the air bubbles mix with water as it tumbles over the rapids and waterfalls.

What I am expecting

Hypothesis 2: The dissolved oxygen will increase with the presence of white water

There was little wind that day, so no site would have oxygen entering from the air by this method.
Site 1 was just below the place where the river came off a plateau which contained a bog from which much of the water was sources. There was little plant life there. So the dissolved oxygen would probably be lower.

Site 2 had lots of white water from so probably this site more than any other will have a higher dissolved oxygen.

Site 3 & 4 were both under the trees, so did not get much sunlight, but there were few water plants in either. Neither had white water although in both the water had currents in and shallow slow flowing parts, so their dissolved oxygen would likely be lower than site 2.

pH (acidity)
The expected values are 6.5–8.5, from slightly acid to neutral to slightly alkaline.

There is some potential sources of acid in this river, from the acid given off by peat or other rotting material around the sources and also from animal pollution. But given this is on a site to the west of the UK, as most of the rain bearing clouds come across the Atlantic and so do not have acid in the clouds from industrial processes.

What I am expecting

Hypothesis 3: The pH will be more acid where there is organic pollutants

Site 1 is near the boggy sources, so this is likely to be more acid.

By the time the water reaches Site 2, the water may be slightly less acid.

At site 3, sheep have access to the river – there were some in the field that day and this is their only source of water, so pollution of urine (acid) and faeces is likely

Site 4 is has no particular sources, so is likely to be close to neutral

Turbidity

Turbidity refers to how cloudy the water is due to the solids carried in it in suspension. High turbidity indicates a lot of suspended material while low turbidity means that it can be seen through quite clearly.

The turbidity determines how much light gets into the water and how deep it goes. Excess soil erosion, dissolved solids or excess growth of micro-organisms can cause high turbidity on a long term basis. All of these can block light. Without light, plants die. Fewer plants mean less dissolved oxygen. Dead plants also increase the organic debris, which micro-organisms feed on. This will further reduce the dissolved oxygen. No dissolved oxygen means other aquatic life forms cannot live in the water.

What I am expecting

Hypothesis 4: The turbidity will be the same at all sites

The water is stained dark brown from its sources in the bogs. The bottom can be seen as if through a brown stained glass window. I am unsure as to whether this means it has high turbidity. Will have to wait until the test to see the answer to that one.
The velocity of the river:

In general, the steeper the slope, the higher the velocity. But there are other factors involved in the exact velocity of a particular place. Some parts of a river, for example on the outside of a bend the velocity is likely to be faster, while on the inside slower than the average. In mountain streams, large boulders can create currents and eddies that may either speed up or slow down the speed of the water.

What I am expecting

Hypothesis 5: The velocity will decrease the further the site is from the source

I would expect from the general rule, the velocity would decrease down stream, getting slower as you proceed from site 1 to site 4. But it would also seem likely that  site 2 would have a higher velocity that the others. However, given that the river was divided and very rock on site 2, the velocity here could not be measured.

The width, depth and cross-section of a river:

The width, depth and cross-section all change according the rainfall that has occurred in the recent past. All of these will increase if recent heavy rainfall has occurred.

In general as more water is added to a river from tributaries you would expect it to get wider and deeper. However, in some places a river might become much wider but shallower, if the river banks were gentle. Also if it passed through a narrow gap, the river might become much deeper but narrower.  So it is the cross-section that has some consistency, and that should increase as the river passes down stream.

What I am expecting

Hypothesis 6: The estimated cross-section will increase the further the site is from the source

Discharge

Is the amount of water passing a particular point in cumecs (cubic metres per second) and can be found by multiplying the velocity in metres by second by the cross-sectional area in square metres. As more water is added, then in general, you would expect the discharge to increase down stream.

Hypothesis 7: The estimated discharge will increase the further the site is from the source.

Fieldwork in Wales 1

The weather was mild ( 13.5 to 15,5 deg C) and there was no wind to speak of. It was quite sunny at the start but had clouded over by 4.30 when we had fnsihed, but the cloud was light grey with no sign of rain. The Pressure was 1018 and rising .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tomorrow, Iw ill explain what we expected to find and why.

We did water quality on all 4 sites

But only did width, depth and velocity on sites 1, 3 and 4. Can you think why that was?

 

Snowballs Entering The Earth’s Atmosphere?

Every child knows the water cycle and that the total volume of water on the planet stays the same. However, recent research suggests that snowballs the size of houses enter the atmosphere every few seconds, adding an additional 300 million tons of water a year, enough to increase sea levels by 0.1mm.
A bit more about it here here.