CU-Boulder ATOC 1060 - ATOC CH 6 notes (2 pages)

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ATOC CH 6 notes



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ATOC CH 6 notes

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Atoc 1060 - Our Changing Environment: El Nino, Ozone, and Climate
Our Changing Environment: El Nino, Ozone, and Climate Documents

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Sarah Rose ATOC 1060 CHAPER 6 Cryosphere high albedo Earth s major ice caps Greenland and Antarctica Ice cover of the Arctic and Antarctica oceans Continental ice sheets ice shelves mountain glaciers sea ice river lake ice snow cover permafrost Glaciers ice sheets sea ice are in constant motion Ice sheets ice on land potential to change sea level Ice shelves ice floating on water does not change sea level Thermal inertia high albedo reflects energy that would other wise be absorbed Snow temperature keeps air temperature lower snow is not a good conductor of heat low thermal conductivity snow cover reduces heat loss from the ground to the atmosphere aged snow is more dense Permafrost p permafrost g atmospheric greenhouse gas concentration T temperature Permanently frozen ground any ground the remains below zero degrees Upper layer is the active layer Where permafrost has high ice content thawing can cause subsidence depression and small hill cause by this are referred to as thermokarst melting permafrost also releases trapped greenhouse gases near surface melting of permafrost results in lakes and waterlogged soil with anaerobic low oxygen conditions fosters an environment for methane producing organisms largest reservoir of carbon carbon in permafrost 2x carbon in the atmosphere melting permafrost effects local ecosystems Artic warming much faster then the rest of the planet because of the positive ice albedo feedback Glaciers and Ice Sheets They are shrinking Snow cover persists through summer and starts to accumulate over time increases in thickness localized differences in vapor pressure result in sublimation increases density Sea ice seasonal cycle over months shrinking on decadal time scale Sea Ice and atmosphere ocean heat flux winter artic air below freezing artic sea water near freezing warmer then air sea ice insulates ocean s sea ice concentration T air temperature h heat flux form ocean Ablation melt CHAPTER 7



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