Imnavait 1km

General Information

Created: 2013-12-27 16:07:35
Modified: 2014-02-03 13:41:19

Active: Yes
Country:United States
CALM-Code:U11 A
Responsible Countries: United States,
Timezone:UTC/GMT -09:00 hours
Vegetation Type:Shrub Tundra
Responsible Person:Nikolay Shiklomanov
Offset:100 m


The Imnavait Creek site encompasses a north-south trending stream valley, much of the valley’s slopes, and an adjoining hill crest. Wet acidic tundra with a thick organic mat occupies the valley bottom. The higher elevations are occupied by moist acidic tundra, but the slopes are broken by numerous water tracks that become more prominent downslope (McNamara et al., 1999). These narrow zones contain shrub vegetation, especially willow (Hinkel & Nelson, 2003).



1-sq km grid consists of a square array of surveyed permanent stakes separated by 100 m, yielding an 11 × 11 array of sampling nodes on each grid. Thaw depth and snow sampling was conducted twice by manual probing at each stake. The two values for each sampling point are averaged, yielding a maximum of 121 data points per grid per probing date. The active layer was not measured at locations where grid points intersect rocks or deep water.


Additional climate snow and hydrologic data are also available at

Slope:2 °
Permafrost Zone:Continuous
Vegetation:Tussock-graminoid, dwarf- shrub tundra and low-shrub tundra (moist acidic)
Landform:Glaciated foothills
Lithology:Typic Aquiturbel (Upland), Typic Hemistel (Lowland) Typic Histoturbel, Typic Aquorthel Dry on top of the ridges, wet to saturated in the valley Organic Layer thikness:10 (cm); mineral texture -- silty loam /loam/gravelly loam (coarce glacial till)
Access Timeseries
Bibliographic References
Klene A.E., Nelson F.E., and N.I. Shiklomanov. 2001 The n-factor as a tool in geocryological mapping: seasonal thaw in the Kuparuk River Basin, Alaska. Physical Geography, 22(6): 449-466.
Klene A.E., Nelson F.E., Shiklomanov N.I., and K.M. Hinkel. 2001 The n-factor in natural landscapes: Variability of air and soil-surface temperatures, Kuparuk River basin, Alaska. Arctic, Antarctic and Alpine Research, 33(2): 140-148.
Nelson, F.E., Shiklomanov, N.I., and G.R. Mueller. Variability of active-layer thickness at multiple spatial scales, north-central Alaska, USA. 1999 Arctic, Antarctic, and Alpine Research, 31(2): 179-186.
Shiklomanov, N.I. and F.E. Nelson. Analytic representation of the active layer thickness field, Kuparuk River basin, Alaska. 1999 Ecological Modelling, 123: 105-125.
Hinkel, K.M. Nelson, F.E. 2003. Spatial and temporal patterns of active layer thickness at Circumpolar Active Layer Monitoring (CALM) sites in northern Alaska, 1995-2000. Journal of Geophysical Research, Vol.108, No. D2, 8168.
McNamara, J. P., D. L. Kane, and L. D. Hinzman. 1999. An analysis of an arctic channel network using a digital elevation model, Geomorphology, 29,339353.
Shiklomanov, N.I. and F.E. Nelson. 2003 Climatic variability in the Kuparuk region, north-central Alaska: optimizating spatial and temporal interpolation in a sparse observation network. Arctic, 56: 136-146.
Shiklomanov, N.I. and F.E. Nelson. 2003 Statistical representation of landscape-specific active-layer variability. In Phillips, M., Springman, S. M., and Arenson, L. U. (eds.), Proceedings of the Eighth International Conference on Permafrost, vol. 2. Lisse: A.A. Balkema, 1039-1044.
Bockheim, J.G., Walker, D.A., Everett, L.R., Nelson, F.E. and N.I. Shiklomanov. 1998 . Soils and cryoturbation in moist nonacidic and acidic tundra in the Kuparuk River basin, Arctic Alaska, USA. Arctic and Alpine Research, 30(2): 166-174.
Nelson, F.E., Hinkel, K.M., Shiklomanov, N.I., Mueller, G.R., Miller, L.L., and D.A. Walker. Active-layer thickness in north central Alaska: systematic sampling, scale, and spatial autocorrelation. 1998 Journal of Geophysical Research-Atmospheres, 103(D22): 28963-28973.
Walker, D.A., Auerbach, N.A., Bockheim, J.G., Chapin, F.S., Eugster, W., King, J.Y., McFadden, J.P., Michaelson, G.J., Nelson, F.E., Oechel, W.C., Ping, C.L., Reeburg, W.S., Regli, S., Shiklomanov, N.I., and G.L. Vourlitis.1998 Energy and trace-gas fluxes across a soil pH boundary in the arctic. Nature, 394(6692): 469-472.
Nelson, F.E., Outcalt, S.I., Brown, J., Shiklomanov, N.I., and K.M. Hinkel. Spatial and temporal attributes of the active-layer thickness record, Barrow, Alaska, USA, 1998 Proceedings of the Seventh International Conference on Permafrost. Centre de etudes nordiques de l'Universite Laval, Laval, Quebec, Canada, Yellowknife, NWT, Canada, pp. 797-802
Nelson F.E., Shiklomanov, N.I., Mueller G.R., Hinkel K.M., Walker D.A., and J.G. Bockheim.1997 Estimating active-layer thickness over a large region: Kuparuk River basin, Alaska, USA. Arctic and Alpine Research, 29(4): 167-378.
Walker D.A., Jia G.J., Epstein H.E., Raynolds M.K., Chapin III F.S., Copass C., Hinzman L.D., Kane D., Knudson J.A., Maier H., Michaelson G.J., Nelson F.E., Ping C.L., Shiklomanov N.I., Romanovsky V.E., Shur Y. 2003 Vegetation-soil-thaw-depth relationships along a Low Arctic bioclimatic gradient, Alaska: Synthesis of information from the Atlas studies. Permafrost and Periglacial Processes, 14: 103-123.
Shiklomanov N. I. and F. E. Nelson, F. E., 2002. Active-layer mapping at regional scales: a 13-year spatial time series for the Kuparuk region, north-central Alaska. Permafrost and Periglacial Processes, 13: 219-230.

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U11a Imnavait CreekU11a Imnavait Creek2

Longitude:-149.5 °
Latitude:68.5 °
Elevation:818.700928 m
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