Atmosphere and Carbon Cycle Notes

Overview of the Lab

The lab focuses on understanding the carbon cycle within the atmosphere, marine environments, and terrestrial ecosystems. It examines both inorganic and organic processes, $CO_2$ budgets, and human impacts on carbon emissions.

Main Topics

1. Marine Inorganic Carbon Cycle

   • Chemical reactions involving water, carbon dioxide, carbonic acid, calcium ions, and carbonate ions.

   • The role of phytoplankton, zooplankton, and decomposition in sediment formation.

2. Terrestrial Inorganic Carbon Cycle

   • Chemical reactions similar to the marine cycle but in a terrestrial context.

   • The influence of rivers, subduction zones, and rock types ($CaSiO<em>3$, $CaCO</em>3$).

3. Global $CO_2$ Budgets

   • Box model approach with reservoirs and net fluxes.

   • Analysis of emissions, land flux, and ocean flux.

   • Calculations to determine unknown fluxes ($A$ and $B$).

4. Personal $CO_2$ Emissions

   • Methods for estimating $CO_2$ release from car travel, public transit, and air travel.

   • Comparison of personal emissions to average per capita emissions in different countries.

5. Shift in Energy Sources

   • Analyzing changes in energy sources (e.g., from coal to nuclear) and their implications.

Ways to Solve the Lab and Things to Know

1. Understand Chemical Equations:

   • Know the reactions involved in the inorganic carbon cycle, such as:

     • $H<em>2O + CO</em>2 \rightleftharpoons H<em>2CO</em>3$

     • $Ca^{2+} + CO<em>3^{2-} \rightleftharpoons CaCO</em>3$

   • These equations represent the equilibrium between carbon dioxide, water, and various ions in both marine and terrestrial environments.

2. Master Budget Calculations:

   • Use the box model approach to understand carbon fluxes between reservoirs.

   • Be prepared to solve for unknown fluxes using given emissions, land flux, and ocean flux data.

3. Emission Estimates

   • Be ready to estimate personal $CO_2$ emissions based on travel habits.

   • Understand how to convert miles, gallons, and $CO_2$ release rates into annual emissions.

4. Interpreting Flux Changes

   • Analyze trends and changes in the global carbon cycle.

   • For example, the increase of flux due to the industrial revolution

Practice Question

If a person drives 10,000 miles per year in a car that gets 20 miles per gallon and releases 8 kg of $CO<em>2$ per gallon, what is their annual $CO</em>2$ release from driving?

Solution:

1. Calculate total gallons used: $10000 \text{ miles} \div 20 \text{ mpg} = 500 \text{ gallons/year}$

2. Calculate total $CO_2$ release: $500 \text{ gallons} \times 8 \text{ kg CO}2 \text{/gallon} = 4000 \text{ kg CO}2\text{/year}$

Answer