Graph analysis

There is a clear correlation between surface temperature averages for any given day. Surfaces with a higher albedo are cooler, while those with a lower albedo are warmer; however, the line from day to day for each given location is of a similar shape, indicating that fluctuations in day-to-day temperatures affect each surface simililarly.

Additionally, there is a correlation between aerosol optical thickness and percent transmission: as AOT goes up, percent transmission goes down. This is because AOT measures the amount of aerosol particles in the atmosphere, and percent transmission measures the percentage of light not being blocked by aerosols. The two are directly connected.

Aerosol effects

According to the NASA article provided to our class, it seems that the only well-defined and understood effects of aerosols involve global cooling and not global warming, whether from directly reflecting the sun or from increasing cloud coverage and therefore indirectly reflecting of the sun. However, there are several factors which complicate the effects of aerosols, making this simple prescription of effects far from accurate. For example, aerosols  have the potential to decrease rainfall, and many aerosols trap reemitted heat as well as they reflect entering sunlight, adding to the greenhouse effect and contributing to heating as much as to cooling.

Another major twist in the plot, so to speak, involves the nature of specific aerosols. Though overall, the presence of these aerosols may block solar radiation from entering the atmosphere, this measurement does not account for the difference between man-made and natural aerosols or the chemical makeup and specific effects of different aerosols. As such, the climate effects created specifically by human aerosols, and therefore the ones which are variable and likely increasing, have not been well-studied in isolation. Dust in the air may create longer-lasting clouds, but there has always been dust in the air, and as such it is not particularly relevant to the discussion of climate change. What is relevant, however, are the aerosols created by industrial plants or increased by human behaviors like sulfates and black carbon.

It's still not fully clear how aerosols will affect climate. Based on the articles provided, I predict that the net effect will likely be global cooling, potentially a positive in the wake of other factors leading to global warming. However, because there is the possibility of decreased rainfall as well as damage to human health from harsher chemical aerosols, the situation is not all positive, and even global cooling caused by aerosols could have unforseen effects.

Summary of notes

Solar radiation from the sun controls weather on earth in a variety of ways. Solar radiation, for example, provides 100% of earth's energy budget. This energy given by the sun then is absorbed and heats the planet, or is reflected back into space. A surface's absorption depends on how well it does the first, its albedo on how well it does the second. Some examples of surfaces with a high absorption rate are asphalt, concrete, and other dark, dry materials, which causes a heat island effect in large cities made primarily of those surfaces wherein more heat than usual is absorbed and the areas are especially hot compared to greener places nearby.

When the sun heats the earth, however, it does so unevenly, causing pockets of warm and cool air. Because warm air rises and cool air sinks, this creates uneven pressure within the atmosphere. Wind is the horizontal travel of air from high pressure areas into low pressure areas, as the atmosphere attempts to even out its own pressure. 

The earth's temperature is also affected by greenhouse gases. Though the earth's atmosphere is made of about 78% Nitrogen and 21% Oxygen, the last 1% contains gases like water vapor, carbon dioxide, methane, and more. These gases trap reemitted solar radiation into the atmosphere and prevent it from returning to space, warming the earth. Levels of some of these gases within the atmosphere has been on the rise in recent years, caused mostly by the burning of fossil fuels in human society. 

Another important factor in atmospheric behavior is the prevalence of aerosols in the atmosphere. Aerosols are small solid or liquid particles suspended in a gas, and they can block solar radiation from either entering or leaving earth's atmosphere. They are caused by many processes and events, both human and natural, and can be important or extremely damaging. Some examples of the less pleasant, polluting ones would be sulfur, nitrogen oxides, and hydrocarbons. Clouds are also aerosols.

There are three main groups of clouds: Cirro, or high altitude, Alto, or middle altitude, and nimbus, low altitude clouds carrying precipitation. These main types are further divided into cumulus, or puffy, stratus, or layered, and cirrus, or wispy clouds.

Humidity is a related concept to aerosols, referring to the amount of water molecules in the air. Air can hold different amounts of water molecules at different temperatures, however, so humidity is usually measured as a percentage of the air's water content versus the air's possible water content, with 100% being completely saturated.

Yet another thing which affects earth's climate is the gravity which creates our atmosphere by pushing air molecules toward the earth, effectively pressurizing the atmosphere. This pressure is defined as the force air exerts over an area. Air density, a related concept, deals with the amount of air molecules in a given space.This density decreases rapidly as one travels higher into the atmosphere. Air temperature decreases similarly, with the rate of decrease being called the lapse rate. Earth's atmosphere is divided into several sections based on trends in temperature for each layer. These are, in order from the bottom up, the troposphere, the stratosphere, the mesosphere, the thermosphere, and the exosphere.

Aerosols

     Aerosols are solid or liquid particles suspended in a gas, usually air. There are many types of aerosols, lots of which are man-made and likely what the average person thinks of when hearing the term--hairspray, air freshener, and the like. But the vast majority of aerosols are natural, ranging from the water found in clouds to dust found in dry regions of the world to sea salt from ocean spray. These are part of a planet-wide system of weather patterns which have always existed and which significantly shape the climate of every part of the earth. Many others are natural in origin, but caused by human behaviors--huge amounts of sulfate from burning fossil fuels and black carbon and organic carbon from "biomass burning" (clearing land or getting rid of farm waste).

     The primary ways these particles affect the climate is by changing the levels of solar radiation which reach the earth, either by reflecting radiation back into space or by preventing it from leaving the atmosphere once it enters. These changes can have the net effect of cooling the earth and of heating it, respectively. This makes the process of predicting climate change difficult, because while some atmospheric variables, like greenhouse gases, are well-understood and fairly consistent, the effects of the changing levels of man-made aerosols are highly varied and difficult to predict.

     This means that the long-term effect of aerosols on earth's climate is difficult to pinpoint. There are, however, other ways that they affect daily life. A change in the level of aerosols in a given area can affect visibility, as in city smog or the recently noted haze over places like the Grand Canyon. Certain man-made aerosols can be damaging when breathed in. And some of the "propellants", or base gases, once used in canned aerosol sprays contributed significantly to the thinning of the ozone layer. These propellants, called fluorocarbons, have been almost universally banned, but their effects are still being felt today.

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sources:
http://www-das.uwyo.edu/~geerts/cwx/notes/chap02/aerosol&climate.html
http://www.eoearth.org/article/Aerosols#gen4
http://earthobservatory.nasa.gov/Features/Aerosols/
http://en.wikipedia.org/wiki/Particulates
http://en.wikipedia.org/wiki/Aerosol

Group Work

Three things that worked in my group:

• Everyone got along well.
• Everyone did some work--my group members almost without exception knew what was going on and were willing to do something if it was asked of them.
• Our presentation was the best in the business.

And three things that didn't:

• Our time management wasn't great. We had a few days where no one did anything and one or two where we worked really hard to get it finished in time, and we had to finish up our powerpoint during presentation week.
• I was kind of bossy/controlling. Old habits die hard, and I'm kind of a perfectionist, but I think I should have respected others' choices and work more and done less "management".
• We didn't always allocate the work very well--some people did much more, others less. 

Surface Ozone

Ozone is a chemical made up of three oxygen atoms. It is most often found in the upper atmosphere, where it is created naturally when energy from the sun breaks oxygen molecules (O2) in half and binds each atom to another O2 molecule. This form of ozone is good for the earth; it protects us from harmful UVB rays, which can damage crops and cause skin cancer.

Another form of ozone, however, is less benign. Called surface ozone, it is created in the lower atmosphere by chemicals like volatile organic compounds and Nitrogen oxides (VOCs come from various man-made chemical products like cleaners and paint, while NOx are created by combustion, as in car engines) and is corrosive, damaging plants, animals, and people. It can cause permanent lung damage in people who breathe it repeatedly. And what's more, it's pervasive, because the chemicals which create it come from the burning of fossil fuels, something that western society is completely dependent on and which no one can avoid doing in some aspect of their lives, whether driving, using electricity, or heating one's house.

Because of the dangers of "bad" ozone and its ubiquity, it's extremely important that we study it to figure out how to reduce it or protect against its effects. The role it plays in air pollution is significant and unavoidable, so we must learn as much as we can.

Procedure - measuring HHS trees

We began our research of trees in the Huntington High forest by marking off a rectangle of 10 by 10 meters using twine and wood stakes. Within this rectangle, or transect, we used paint to number all trees large enough to hypothetically be used for lumber.

Using a Clinometer app on students' smartphones, we found the angle to the bottom and to the crotch of the tree 20 meters from the base in order to find the height of the tree. We also used a tape measure to find the circumference of each tree. With these numbers we calculated the size in cubic feet and board feet of the usable part of the tree.

We used a dichotomous key of North American tree species to figure out the types of trees being measured and found the value per board foot of those species, which we then calculated to get an estimated worth of each tree.

Afterward, we used ArcGIS to find the approximate area of the Huntington High forest and looked at tree value data from other classes. Using 4 transects from 4 class mods gave us an improved sample size and we used those numbers and the area of the forest to calculate the estimated (and most likely incorrect, due to measuring inaccuracies) value of the HHS forest.