Global warming experiment help?!?

Wouldn't you be able to use just the light of the sun (perhaps via a simple magnifying glass) to melt the ice-cubes or is the event indoors?

Personally, I am not too fond of having an electrical lamp close to water.

What you can try though is use a torch, the ones which have a low voltage. You'd have to mount it over the container in such a way that the heat it generates does not get lost in the air separating the two (ie, by using some sort of heat resistant plastic which surrounds both the top of the container as the torch).

To Richie:

<<However to mimic what will happen if the North Pole melts you could fill a glass of water and put a few ice cubes into the water. Mark the water level then let the ice melt and you will see that the water level has actually fallen. >>

Grasping the most basic scientific fundamentals is not your strongest point, it appears.

A floating object displaces an amount of water equal to its own weight. When the ice cubes melt, the water level stays exactly the same.

It may be difficult to direct all the light and heat from the bulb onto the ice and create an atmosphere like the earth within the container.

However to mimic what will happen if the North Pole melts you could fill a glass of water and put a few ice cubes into the water. Mark the water level then let the ice melt and you will see that the water level has actually fallen. (You will not need a heat lamp for this experiment)

My experiment proves that all the ice in the North Pole could melt however it would make NO difference to sea level rise as the ice is already displaced in the water and some of the ice would be lost to evaporation. I am surprised that some of the alarmists are not aware of this simple fact as its basic science guys!

There are lots of ways to go about setting up a light source. On a small budget your best option is to make a set of neutral density filters. Good ND filters cost more than you can afford, but reasonable results can be obtained by using aluminized mylar from packaging materials with an electrostatic shielding function. Most of the packaging for computer parts (motherboard, hard drive, etc) is of the right type. Your light bulb output is constant, but the illumination varies as the light passes through 0 to 6 layers of the filter material. Your next best option (higher cost but technically superior) is to build a chopper wheel. Make a series of disks that can be mounted on a small motor. Cut slots in the each disk with different widths. As the disk rotates the light passed is proportional to the cut out area divided by the total area that the light shines on.

A better but more expensive approach is to pulse width modulate the light at 10 kHz. I use PWM in machine vision systems for quality control.

You can use a digital camera as a light meter. Use manual exposure and capture the images to your computer. You can get intensity profiles in each wavelength band into a spreadsheet using a program called ImageJ, which is free from NIH.

I hope this helps.

Edit

here is the link to imageJ

http://rsbweb.nih.gov/ij/

Further to Linlyons comment about transparency, water is nearly transparent in the visible region but absorbs strongly in the infrared. An incandescent light bulb radiates across the spectrum from infrared to visible. There is also UV, especially in the newer compact fluorescent bulbs, but the glass in the bulb is designed to filter the UV out. Thick black polyethylene from a heavy duty garbage bag will pass the IR and block the visible part of the emission spectrum. The water level will change slightly with thermal expansion after all the ice melts and the temperature increases (no change at 0 C). The volume will first decrease to a minimum near 4 C and then increase monotonically.

Also note that it is important to keep the angle of incidence for the illumination constant in the experiment because the amount of light is reflected at the air/water interface is angle (and polarization) dependent. For more details, study the Fresnel equation.

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