Country: United States
Site: Arctic Village CALM-Code: U55
Timezone: UTC/GMT -09:00 hours
Vegetation Type: Forest Tundra
Responsible Person: Leah M. Mackey
Offset: 5 m
DESCRIPTION OF AREA CONTAINING SITE:
Arctic Village is located on the east fork of the Chandalar River, about 100 miles north of Fort Yukon and 290 miles north of Fairbanks. Arctic Village is part of the Yukon- Koyukuk Census Area. The village is in the floodlands of the river, but surrounded by rolling hills. The 50m2 grid is located next to the river on the far end of the “old” village. The area is open and the ground is tussock with sparse alders and tall grasses. The NW corner of the 50mx50m grid is marked by 2 crossed stakes (by the airplane). Two parallel lines of stakes placed every 5m are along the ____ and ___ side. The grid center (N68.13, W145.54) contains continuous soil temperature & soil moisture sensors at above permafrost & just below surface levels. An air temperature sensor is installed on a tree near grid center (microstation ~5m SE of tree). All sensors collect and store data on a 30-minute continuous cycle. The grid was established in 2010, with assistance from the Arctic Village Council, in the second year of a cooperative agreement with the Yukon River Inter-Tribal Watershed Council and the U.S. Geological Survey.
SAMPLING DESIGN AND METHOD:
The Nome Creek site was chosen to increase the range of distribution of Active Layer Network sites.
The grid consists of 2 parallel lines of 10 survey stakes at 5-meter intervals, creating a 50mx50m square grid with a maximum of 100 data points. A compass was used to orientate the grid to a square. Measurements were taken manually every 5m and recorded on a fieldsheet. The measurements were taken at the lowest surface level within about 0.3m of the designated point, to minimize the questionable influence of tussocks on the AL measurement. The "surface level" was determined to be the top of the low-lying vegetation (i.e. moss, lichen, low-bush berries). Thaw measurements greater than 1.3m were noted, but not used in calculations, as of 2009. [CALM protocol suggests a grid size of 100mx100m, however a 50m2 grid was deemed acceptable due to difficult terrain and length of time for installation (personal communication Dr. V.Romanovsky).]
The soil climate station was established in early September 2010 and is located near grid center. The station monitors air temperature, soil temperature & soil moisture. The
HOBO micro station was installed at the grid center. A ~30cm4 hole was dug down to the impenetrable clay layer at 37cm. One set of soil moisture and soil temperature sensors were placed just above the clay layer and one set just below surface level. Soil samples were cut from 31cm and 9cm (cubes) to be analyzed for soil moisture content. The HOBO pro v2 temp/ext temp sensor was installed, recording air temperature, near the grid center about one meter off the ground surface. The Hobo data logger is set to store data on 30min intervals for up to 428 days.
GPS points were taken at the four corners of the grid, as well as the center point where the sensors were located. Site elevation is 533m, recorded at grid center.