Electron Microscopy Unit Snow Page

Data for snow samples collected during the 2002 (CLPX) (IOP-1) Cold Land Processes Experiment for Low Temperature Scanning Electron Microscopy (LTSEM). (ISA) Intensive Study Area- Saint Louis Creek- Pit site- FSSP9 located in Alpha sector- south east side in young coniferous and deciduous forest. Samples Collected : by Eric Erbe-USDA-ARS-Beltsville Agricultural Research Center-Electron Microscopy Unit-Feb.20,2002, 12:30 AM , 15 meters East of the pit marking pole. Light graupel snow falling-No sun-breezy-below 0 degrees C entire period of collection Pit characterization done by Dr. Richard Armstrong.


Total Pit Depth: 81 cm AG= (above ground)
70-81 cm AG New snow (dendrites and pyramid graupel)
62-70 cm AG ( 2-3 day old snow crystals)
62- AG - weak layer
57-62 cm AG small faceted grains
57- AG - weak layer
38-57 cm AG - Faceted grains
37-38 cm AG - 0.5 cm thick ice layer (old sun crust)
0-37 cm AG - Faceted Depth Hoar

Samples for (LTSEM) taken from north facing pit wall. 2-3 samples collected from the center of each 10 cm layer of the snow pit starting collection in the bottom layer (0-10) cm AG.
CR = cryo run # for LTSEM processing information. Samples photographed on a Hitachi S-4100 low voltage scanning electron microscope using an Oxford CT-1500 HF cryo preparation system.

33987 33991 33973 33985 33927 33937 33925 33929 33959 33966 33960 33967 33918 33923 33917 33921 33906 33903 33896 33900 33856 33864 33860 33866 33886 33880 33889 33885 33876 33872 33874 33878 33847 33846 33849 33853


USDA, ARS, PSI, SGIL, EMU. Updated: 2006.