Ice Phenology Investigation

Ice Phenology Investigation

River Freeze-Up Data Sheet

School Name: _____Tri_Valley School______Study Site: __Healy, AK_____

Observer Names:___Hunter & Riley______

Date: Year:_____2009___ Month: _____Nov_____ Day: ____25th_____

Local Time (hour:min): ______11:45am______Universal Time (hour:min): ______

General Freeze-Up Ice Observations:

Upstream (border ice only):
Estimate fraction of width covered by border ice: / _60____ %
Changes in border ice: / ❒ X None ❒ Fractured ❒ Flooding Movement
Downstream (border ice only):
Estimate fraction of width covered by border ice: / __70___ %
Changes in border ice: / ❒ None ❒ X Fractured Flooding Movement
Across stream (ice in open water only):
Ice types: / ❒ None X Frazil X Pancakes, small
❒ Pancakes, large
Frost smoke? / X Yes No
Ice surface:
(may choose more than 1) / ❒ X Smooth Rough ❒ X Blocky/Broken/Jumbled Wet/Flooded
❒ Holes/Leads ❒ Bare (melting) ❒ Ice jam
Snow on ice: / ❒ X None ❒ New, patchy New, continuous
❒ Stable with new snow layer Stable/No change ❒ X Wind redistributed
❒ Icy crust ❒ Melting/Wet ❒ None (warm)
Snow on bank/shore: / ❒ X None ❒ New, patchy New, continuous ❒ Stable with new snow layer
Stable/No change ❒ Wind redistributed ❒ Icy crust ❒ Melting/Wet

Environmental Observations:

Cloud Cover: / ·  If Three-quarters or More of the Sky is Visible: (Check one)
No Clouds Clear Isolated Scattered
0%-No Clouds ❑ <10% Clouds ❑ 10-25% Clouds ❑ 25-50% Clouds
Broken Overcast
❑ X 50-90% Clouds ❑ >90% Clouds
·  If View of More than One-quarter of the Sky is Blocked:
Obscured ❑ Check here
Why is the view of the sky blocked? (Check all that apply)
❑ Blowing Snow ❑ Heavy Snow ❑ Heavy Rain ❑ Fog ❑ Spray
❑ Volcanic Ash ❑ Smoke ❑ Dust ❑ Sand ❑ Haze
Wind*: / Calm (0 m/s) ❒ X Light wind (0.3-5.4 m/s) ❒ Windy (>5.4 m/s)
Precipitation type: / X None ❒ Snow flurries ❒ Snowing ❒ Fog/Drizzle ❒ Rain ❒ Freezing rain

*See Ice Phenology Investigation Field Guide for definitions.

Environmental Observation Comments:

It was -1.1 degrees Celsius at time of observation. We have had a lot of wind over the past day or two that really warmed us up!

Standard Photograph Set of River Ice Frreze-Up:

Enter the filename of each photo and accompanying comments here:

Across Photo:
HLY_091125_Acr
Comments:______
Downstream Photo:
HLY_091125_Dn
Comments: ______
Upstream Photo:
HLY_091125_Up
Comments:______

Optional Photographs of River Ice Freeze-Up:

Enter the filename of each photo and accompanying comments here:

Additional Photo 1:
XXX_999999_ADD1
Comments:______
Additional Photo 2:
XXX_999999_ADD2
Comments:______
Additional Photo 3:
XXX_999999_ADD3
Comments:______

Other Comments:

Kim Morris, Geophysical Institute, Univ. of Alaska Fairbanks 1