We’re not the only ones who need to keep a balanced budget. Just like we all have budgets, the Earth has one too. If we spend too much money, our household budget gets out of balance. Likewise, with tons of excess carbon dioxide released into the atmosphere, the Earth’s energy budget gets out of balance. Lin Chambers from NASA’s Goddard Space Flight Center spoke with us today about how changes in the atmosphere (like humans adding literally tons of CO2 to the atmosphere every year) can affect the climate.
So it works both ways – humans can affect the climate, and the climate affects us. We went outside and proved that for ourselves, and used Vernier temperature probes to record the temperatures of a variety of different materials and colors. Higher temperatures were recorded for darker colors, proving that old piece of advice you always get in the summer – wear a white shirt in the sun, not a black one. And what is one of the great things about the icy, white polar regions? They are like a white shirt for the Earth. If they melt, it unbalances the Earth’s budget even more. We all have to work on balancing this budget!
Comparing temperatures in sun and shade, and with different materials
Every time we take a breath, we inhale gazillions of tiny solid and liquid particles in the air. These particles are called aerosols. It’s incredible that something ranging from the size of a virus to the width of a human hair can have major effects on our health, and on the Earth’s climate. Aerosols are not completely understood – but what scientists do know is that there are many kinds, both human-caused and natural, and that they definitely can affect the climate.
A lot of aerosols are natural – like sea salt, dust, or the kind ejected up from volcanic eruptions. But then there are the kinds that we humans spew into the atmosphere – like from fossil fuel combustion, cars, and power plants. We learned that these aerosols affect the atmosphere and climate because depending on the type, they can reflect or absorb the sun’s radiation.
Delivering a climate presentation
There seem to be lots of kinds of aerosols, and lots of ways they affect the climate. So we split into groups and each took one kind to research. At the end of the day, we all got to teach each other what we learned about aerosols. Check out the pollution above Beijing, China in 2009 – that’s not clouds!
Pollution above Beijing
Through Second Life, we also got to talk to Dr. Compton Tucker, a scientist at NASA’s Goddard Space Flight Center. He talked about his work in studying an 200m diameter impact crater in the Amazon. The impact released 500 to 1000 megatons of TNT. Imagine the aerosols thrown into the atmosphere by that event!
So how is it that we know about past climate on the Earth? Nowadays we have satellites that monitor patterns and conditions in the land, atmosphere, oceans, and polar regions. But what about before satellites? Today we learned that scientists study ice and sediment cores to learn about past climates.
Basically, each year ice and sediment settle into layers. If you drill down deeper and deeper into ice or sediment, each layer tells us what the climate was like further and further back in time. In that way, ice and sediment cores are kind of like a time machine!
Today Bryan Mark from the Byrd Polar Research Center at the Ohio State University talked to us virtually through Second Life. (So really it was his avatar talking to all of our student avatars.) He talked to us about his research in paleoclimatology (an official way of saying he studies Earth’s long-term climate record), and his research in the connection between glaciers, climate and Earth’s water resources. Dr. Mark actually goes to Peru to study tropical glaciers in the Andes Mountains!
Dr. Bryan Mark meets with students in Second Life
We also got to make models of time machines (aka sediment cores). Using everyday stuff like gravel, dirt, ice, and clear plastic tubing, we actually mixed up the materials in three different combinations, and deposited them so they made three distinct layers. These layers represented three different conditions: an ice sheet (ice over solid land), an ice shelf (ice floating on water), and the open ocean. In real sediment cores, when scientists see indications of these conditions, in this order, it shows that the climate was warming up over that time period.
Reconstructing a sediment core
How amazing! We can “tell time” by rocks and ice! That is exactly what climate scientists like Dr. Mark are doing.
The YouthEXPO project has been busily developing a simulation, or “island,” in Second Life as a new model of climate change education. Last year, a prototype of the YouthEXPO island was started in the Teen Grid, but as of January 2011 all Teen Grid islands have been brought into a new, integrated grid.
This new presence gives us the opportunity to get closer to the mini-continent known as SciLands, including other NASA islands, Museums like the Exploratorium and The Tech Museum of Innovation, and other organizations dedicated to science education. This month, we submitted our official application to SciLands, and— wait for it— we’re in! The SciLands Senate sent their official welcome letter on February 12, 2011.
More updates on YouthEXPO in Second Life, and in SciLands, will be posted here.
On Wednesday 21, 2010 Matt Rogers an Atmospheric Scientist from Colorado State University joined Youth EXPO summer program students in-world in NASA Island. He delivered a presentation on the CloudSat mission and answered students’ questions about careers in Atmospheric Science. He blogged about it here. His post was featured on NASA’s Global Climate Change web page.
The material is based upon work supported by NASA Competitive Program for Science Museums and Planetariums under award No. NNX09AL31G. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration.