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15 Cards in this Set
- Front
- Back
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2012-2015 is the lowest Kern River flow in the last 2,000 years. |
WHOA |
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The warmer the oceans the __ water we get because more evaporation happens. |
more (more evaporation = more rain). |
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Why aren’t we getting more rain now? Aren’t the oceans warming? ___ conditions have changed: ___ winter arctic ice = lessrain in the western U.S.
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Boundary conditions; less winter arctic ice; |
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When climate has changed in the past, usually it is from Greenhouse gases. |
Global temperatures rising. CO2 Mauna Loa Rising. CO2 ice cores kind of. |
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How do we know how the atmospheric air was back then? |
Air bubbles in glaciers |
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8 pounds of 1 gallon of gas produces more than twice as much CO2 19 pounds. |
CO2 in atmosphere is light and has more Carbon 12. |
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Volcanoes throw a lot of CO2, but average eruptions in year only 1/150th of the Carbon coming from fossil fuels. |
It is isotopic fingerprint of carbon. |
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Pre-18th Century C in atmosphere @280 ppm600 billion metric tons (Gt).
Total C production from fossil fuel burning 320 Gt. More than enough to bring [CO2] up 40% tocurrent value of ~390 ppm (excess is absorbed p |
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___ measurements ofatmospheric CO2supports a fossilfuel source.As does decrease in atmospheric __ required forcombustion of the fossil fuels.
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Carbon isotope; O2 |
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We know that the world’s oceans are becoming __ acidic over time which is caused by theirabsorption of atmospheric CO2
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more acidic |
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How do we know the earth is warming? |
1. Temperature measurements.
2. Ocean heat content 3. Shrinking cryosphere (ice and snow) 4. Rising sea level |
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Scientists know or strongly suspect Carbon Dioxide (CO2) has been increasing in the atmospherebecause
1. Using records of fossil-fuel burning, can calculate the approx. amount of CO2 that shouldhave been liberated to the atmosphere over time. 2. We know the amount of human-caused CO2 increasing in the atmosphere over time because we can measurethe amount of Carbon-12 isotopes as found in ancient samples from glacial-ice cores. 3. We can measure the amount of DECREASE of atmospheric Oxygen which is a gas consumed during burning offossil fuels by analyzing samples of gas trapped in glacial-ice cores. |
kkkkkk |
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Atmospheric increases of CO2 is causing the planet to warm and a local example of climate changeis evidenced locally by the lowest streamflow in the __ in the last 2,000 years
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San Joaquin Valley |
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Every doubling of CO2 leads to increase of how many Celsius degrees? |
3 degrees Celsius |
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We are almost at 400. Half from Greenhouse half from reflectivity of earth changing. |
NO ONE CARES |
