Hadley circulation—when heated air rises in the tropics, it ascends to the upper level of the atmosphere and then travels to the north and south. It descends again in the mid-latitudes, and travels ba ...

events over the Jan-March period. Also, we'll study how improving the initial state of the atmosphere in the models during El Niño can impact forecast skill. The campaign was an invaluable experience ...

more than 800 submissions. This photograph of Sulphide Glacier may only be reproduced or re-used in connection with the Fifth National Climate Assessment. Any other use must be negotiated with the aut ...

Stressors and impacts. As emissions of heat-trapping bases accumulate in our atmosphere, Earth's polar regions are warming more quickly than at lower latitudes. The rapid environmental changes that re ...

while a gas, nevertheless behaves broadly as a fluid. The polar vortex is the region of the atmosphere that contains the hemisphere's cold air, rotating from west to east. In the Northern Hemisphere, ...

students to compare and contrast different climate variables such as El Niño, temperature, CO2, solar energy levels, on the same time scales. Comments from expert scientist: The resource contains gra ...

pressure over the eastern United States. At the 500-millibar (mb) pressure level of the atmosphere (the altitude where the pressure is 500 millibars, or roughly 18,000 feet), the younger, smaller brot ...

information and resources are provided. Because links to online resources are also provided in the student worksheets, prep time on the teacher's part should be minimal. Materials included in both PDF ...

to explore an estuary of their choice (note, no rubric is supplied for this additional activity). In lesson 5 where students will evaluate their own hypothesis, educators should remind students that i ...

slowed compared with 20 years ago, which is consistent with there being less chlorine in the atmosphere. To learn more about NOAA and NASA efforts to monitor ozone and ozone-depleting gases, visit:. O ...