tl5c_surfgeom_u6

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Alaska Geobotany Center
Publication_Date: Unknown
Title: tl5c_surfgeom_u6
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: \\137.229.50.172\geodata\arcticAtlasMaster.gdb
Description:
Abstract:
The Toolik Lake Grid map focuses on the south side of Toolik Lake. This areas is on of the principal intensive research areas at the Toolik Lake Field Station. It includes many experimental research sites where long-term observations and experiments are being conducted, including the greenhouse and snow-fence experimetns. The grid was constructed in 1989 to provide geographic referencing for experimental plots and to provide a sampling scheme for periodic measurements of snow, active layer and plant communities.
The surfaces of the landscapes in the Toolik Lake region have been modified by a variety of geomorphological processes including alluviation (movement of material by water), colluviation (movement of material by gravity), and periglacial processes (freezing and permafrost-related phenomena). Common surficial geomorphological features within the mapped area include sorted and nonsorted circles (frost boils), turf hummocks, gelifluction lobes and terraces, water tracks, high-and low-centered ice-wedge polygons, wetland features and thermokarst features.
Classes of surficial geomorphology: Stony surface. Areas covered by cobbles and stones such as river gravels, talus slopes, blockfields, and bedrock areas.
Nonsorted circles. Roughly circular 1-2-m diameter slightly convex barren features, spaced from 2 to many meters apart. They are composed of fine-grained mineral material that periodically undergo freezing and heaving. Nonsorted circles, or frost scars, are ubiquitous features on most hillslopes, and are not differentiated here unless they cover more than 50% of a surface.
Stripes. Hillslopes with a striped pattern consisting of elongated relatively dry well-drained elements 1-3 m wide oriented down the steepest available slope, alternating with intervening moister interstripe elements 1-3 m wide. They are caused by combination of cryoturbation, erosion, and gelifluction. The dry elements usually are covered by nonsorted circles. Most stripes are nonsorted with similar grain size of material in the stripe and interstripe areas; sorted stripes and circles occur in rocky alpine areas.
Upland turf hummocks. Small regularly spaced hummocks (<50 cm high) and 25 to 50 cm wide, thought to be caused by a combination of runoff, thermal erosion and gelifluction. They are common on steep well-drained slopes, often found in association with snowbeds and gelifluction lobes and terraces.
Gelifluction features. Areas of slow downslope movement of the active layer caused by saturated soils moving over permanently frozen ground. Includes gelifluction lobes, benches, and streams mostly greater than 50 cm high. Common on steep hillslopes.
Well-developed hillslope watertracks. Shallow subparallel drainages normally spaced tens of meters apart, with well defined channels giving many slopes distinctive "horsetail" patterns. Well-developed watertracks carry runoff and meltwater through most of the summer and are usually filled with shrubby vegetation. They are most abundant on long lower hillslopes, particularly slopes that have deep snow accumulation to provide meltwater throughout the summer.
Poorly-developed hillslope watertracks. Watertracks with poorly defined channels that normally carry runoff only during the snowmelt season and immediately after rainfall events. They are discernible on aerial photographs because of somewhat shrubbier vegetation in the water tracks. Poorly defined watertracks often occur on upper hillslopes and may turn into well-developed watertracks on the lower slopes.
Low-centered ice-wedge polygons. Ice-wedge polygons composed of a central low "basin", a raised "rim", and a "trough" between polygons. The basins are usually 8-10 m in width and circular to weakly polygonal in plan. The raised rims of the polygons may be as much as 1-2 m wide, as much as 0.5 m higher than the basin and may compose over 30% of the total polygonal unit. The troughs of polygons occur over the tops of underlying ice wedges, are usually less than 1 m wide. The basins and troughs are usually wet all summer. Thermokarst ponds commonly occur at the junctions of polygon troughs. Low-centered polygons are not abundant in the region but occur in association with flat drained lake basins and river floodplains. pads.
High-centered ice-wedge polygons and palsas. Ice-wedge polygons with a raised center portion that is raised above the trough element. Relief between the center and the trough is normally about 0.5-1.0 m, and polygon diameters are usually 10-15 m in diameter. High centered polygons occur marginal to larger streams and rivers, especially on outwash terraces. On some upland surfaces, the polygons are poorly developed or totally masked by tussock-tundra vegetation. Some raised features, particularly in colluvial palsas, which are small peaty mounds with perennial ice lenses.
Wetland microrelief. Wet areas with a mixture of strangmoor, disjunct ice-wedge polygon rims, aligned hummocks, nonaligned hummocks, and lowland watertracks. Strangmoor consists strangs, which are sinuous ridges many meters long that form perpendicular to the direction of the local hydrologic gradient. Aligned hummocks are shorter features also oriented perpendicular to the hydrologic gradient. The strangs are up to 0.5 m wide and 0.5 high. Disjunct polygon rims are associated with incompletely formed or eroded low-centered polygons.
Thermokarst. This code is used in three situations: (1) Areas with eroding subsurface ice that may be buried glacial ice or ice-rich permafrost; this occurs marginal to several kettle lakes on Itkillik-age glacial surfaces. (2) Thermokarst pits that occur at ice-wedge junctions and often associated with ice-wedge polygons. (3) Beaded streams that have regularly spaced circular pools that have formed where the stream has eroded out ice-wedge junctions; between "beads" the stream often follows a linear channel along eroded ice-wedges.
Pond complex. Wetland areas with numerous ponds mixed with relatively well-drained areas.
Featureless. Areas with no discernible pattern at the mapping scale. However, nonsorted circles, small gelifluction features, and/or poorly-developed water tracks commonly occur in these areas.
Irregular microrelief. This unit is used for a wide variety of situations where there is considerable microrelief that cannot be ascribed to any of the above features, such as rolling topography common on till and outwash surfaces, hillslopes and bluffs with irregular erosion features, and floodplains with a mixture of channels, bars, ponds, etc.
Water. Includes lakes, ponds, and rivers.
Disturbed. Includes gravel mines and contstruction pads.
Purpose:
Map of surface features in the Toolik Lake research grid for use by various projects
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Currentness_Reference: Unknown
Status:
Progress: In work
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -149.622532
East_Bounding_Coordinate: -149.593013
North_Bounding_Coordinate: 68.626764
South_Bounding_Coordinate: 68.616895
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: Alaska Geobotany Center
Theme_Keyword: tl5c
Theme_Keyword: ITUM
Theme_Keyword: geomorphology
Theme_Keyword: tundra
Theme_Keyword: research grid
Theme_Keyword: LTER
Place:
Place_Keyword_Thesaurus: Alaska Geobotany Center
Place_Keyword: arctic
Place_Keyword: Alaska
Place_Keyword: northslope
Place_Keyword: Upper Kaparuk River region
Place_Keyword: Toolik Lake
Access_Constraints: Unknown
Use_Constraints:
Data provided by the Alaska Geobotany Center are copyright protected under the provisions of a Creative Commons Attribution-NonCommercial-ShareAlike License (<http://creativecommons.org/licenses/by-nc-sa/1.0/>). Materials may be freely downloaded, reprinted and redistributed for non-commercial use. Reproduction and redistribution of the materials on this web site, including derivative works, shall give credit to the Alaska Geobotany Center and remain subject to the above license. Any web pages that use this material shall contain a link pointing to the Alaska Geobotany Center home page (<http://www.geobotany.uaf.edu/>).
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Alaska Geobotany Center
Contact_Person: Hilmar A. Maier
Contact_Position: GIS and Remote Sensing Manager
Contact_Address:
Address_Type: physical address
Address: Alaska Geobotany Center
Address: Institute of Arctic Biology
Address: University of Alaska Fairbanks
City: Fairbanks
State_or_Province: AK
Postal_Code: 99775
Country: US
Contact_Voice_Telephone: +1.907.474.1540
Contact_Voice_Telephone: +1.907.474.2459
Contact_Voice_Telephone: +1.907.474.2460
Contact_Electronic_Mail_Address: hilmar.maier@alaska.edu
Contact_Instructions: <http://www.geobotany.org/>
Native_Data_Set_Environment:
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Data_Quality_Information:
Lineage:
Process_Step:
Process_Description: Dataset copied.
Process_Date: 20100127
Process_Time: 14392800
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Point_and_Vector_Object_Information:
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Point_and_Vector_Object_Count: 15
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UTM_Zone_Number: 6
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Longitude_of_Central_Meridian: -147.000000
Latitude_of_Projection_Origin: 0.000000
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Planar_Distance_Units: meters
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: tl5c_surfgeom_u6
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
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Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
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Attribute:
Attribute_Label: surfgeom
Attribute_Definition: Surficial geomorphology
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Enumerated_Domain_Value_Definition: Stony surface
Enumerated_Domain_Value_Definition_Source: AGC
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Enumerated_Domain_Value_Definition: Nonsorted circles
Enumerated_Domain_Value_Definition_Source: AGC
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Enumerated_Domain_Value_Definition: Stripes
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Enumerated_Domain_Value_Definition: Upland turf hummocks
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Enumerated_Domain_Value_Definition: Geligluction features
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Enumerated_Domain_Value_Definition: Well-developed hillslope watertracks
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Enumerated_Domain_Value_Definition: Poorly-developed hillslope watertracks
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Enumerated_Domain_Value_Definition: Low-centered ice-wedge polygons
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Enumerated_Domain_Value_Definition: High-centered ice-wedge polygons
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Enumerated_Domain_Value_Definition: Wetland microrelief
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Enumerated_Domain_Value_Definition: Thermokarst
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Enumerated_Domain_Value_Definition: Pond complex
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Enumerated_Domain:
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Enumerated_Domain_Value_Definition: Irregular microrelief
Enumerated_Domain_Value_Definition_Source: AGC
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Enumerated_Domain_Value_Definition: Water
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Enumerated_Domain_Value_Definition: Disturbed
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Alaska Geobotany Center
Contact_Person: Hilmar A. Maier
Contact_Position: GIS and Remote Sensing Manager
Contact_Address:
Address_Type: physical address
Address: Alaska Geobotany Center
Address: Institute of Arctic Biology
Address: University of Alaska Fairbanks
City: Fairbanks
State_or_Province: AK
Postal_Code: 99775
Country: US
Contact_Voice_Telephone: +1.907.474.1540
Contact_Voice_Telephone: +1.907.474.2459
Contact_Voice_Telephone: +1.907.474.2460
Contact_Electronic_Mail_Address: dataManager@geobotany.org
Contact_Instructions: <http://www.geobotany.org/>
Resource_Description: Downloadable Data
Distribution_Liability: Unknown
Metadata_Reference_Information:
Metadata_Date: 20100203
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Alaska Geobotany Center
Contact_Person: Gayle Neufeld
Contact_Position: GIS technician
Contact_Address:
Address_Type: physical address
Address: Alaska Geobotany Center
Address: Institute of Arctic Biology
Address: University of Alaska Fairbanks
City: Fairbanks
State_or_Province: AK
Postal_Code: 99775
Country: US
Contact_Voice_Telephone: +1.907.474.1540
Contact_Voice_Telephone: +1.907.474.2459
Contact_Voice_Telephone: +1.907.474.2460
Contact_Electronic_Mail_Address: dataManager@geobotany.org
Contact_Instructions: <http://www.geobotany.org/>
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Generated by mp version 2.9.6 on Wed Feb 03 13:59:39 2010