CALM SITE R1	NADYM GRID
Site code	R1
Site name	Nadym Grid
CAPS I Metadata form	GGD357
CAPS II Metadata form	GGD313_R1A
Site Photograph	Data
Responsible for data submission	Andrey Gravis
Email Address	ag.gravis@gmail.com
Institution/Organization	Earth Cryosphere Institute SB RAS, Moscow
Location description	West Siberia
Location Lat.	65.314861 N
Location Lon.	72.864194 E
Elevation avg. (m)	28
Methods Grid	100
Methods Other	Air Temperature, Soil temperature, Soil Moisture
Landscape Description	Lacustrine-alluvial plain dissected by lakes and ravines
Vegetation /Classification	Wet dwarf shrub-moss-lichen peatland, and sedge-moss mire
Soils (or Material)	Dystri-Cryic and Dystri-Gelic Histosols (sandy) and Sphagnic Cryofibrists
Thaw depth measurements (year started)	1972-2000 (peatland), 1997-present (CALM grid)
Air temp. measurements (year started)	1997
Snow cover measurements (year started)	NA
soil temp. measurements (year started)	1997
soil moisture measurements (year started)	1997
general description of soil moisture (dry, moist, wet, saturated)	wet
soil texture: if non organic describe texture, if organic indicate thickness of organic layer (cm)	Organic Layer thickness: 35 (cm)

SITE DESCRIPTION

Active layer monitoring at the Nadym CALM grid was initiated in 1997. Since 1972 annual thaw depth monitoring was conducted at several transects and 10х10 m plots characteristic of dominant landscapes of the Nadum region and adjacent to the CALM grid. The Nadym site is located in the northern taiga with sporadic permafrost on the III fluvial-lacustrine plain with elevation ranging from 25 to 30 m above sea level. The plain is composed of sandy deposits interbedded with clays, occasional covering of peat. Patches of permafrost are closely associated with peatlands, tundras, bogs and frost mounds. In the central part of the III fluvial-lacustrine plain flat peatlands with cloudberry-shrub-lichen-moss cover are dominate Sedge-moss mires and hummocky sedge-shrub moss-lichen tundras are subdominant nature complexes. From nature complexes flat peatland is dominant, bog and tundra are subdominants. Peatland area characterized by Ledum palustre, Rubus chamaemorus, Sphagnum fuscum and Cladina stellaris; hummocky tundra is characterized by Betula nana, Ledum palustre, Cladina stellaris, Cladina rangiferina and Sphagnum Lindbergii in pools, bog is characterized by Carex rotundata, Carex limosa, Eriophorum russeollum, Shagnum Lindbergii and Betula nana, Eriophorum vaginatum on rare hummocks. The measurements of the active layer thickness show that the smallest values of seasonal thaw depths are observed under Rubus chamaemorus-Ledum palustre-Sphagnum-Cladina rangiferina cover on flat peatland. This type of peatland serves as an indicator of seasonal thaw depth. Areas with deepest thaw are developed in large sedge-moss pools within peatlands and in bogs. Rubus chamaemorus is developed at grid points with minimal thaw depth, but Sphagnum lindbergii is characteristic for places with maximal thaw depth. The interannual node variability of thaw depths at this grid averaged 20 %. The minimum values of this parameter are characteristic for the flat peatland, the maximum values are fixed on hummocky tundra. The same was observed on plots and transects on which measurements were carried out since 1972. For 1997-2007 period the maximal thaw depth is fixed in 2002 with warm summer and very high summer precipitations. In this year average thaw depth was 143 cm. The minimal thaw depth is observed in 1999 cold year. The least thaw depths are observed on a flat surface of a peatland where average depth is 80сm. Sites with deeper thaw depth are characteristic for the downturn places occupied by shrub-sedge-peat moss bog with thaw depth - 151сm. Sites with deep thaw depth are measured also on hummocky tundras with peat hummocks, frost boils and pools where thaw depth is 152сm.The greatest values of volumetric moisture are observed on a peatland and a bog. On the average for CALМ grid the value of volumetric moisture makes 67 %. The least values of moisture (20 %) are characteristic for hummocks, the greatest (89 %) - for pools of hummocky tundra and a peatland of CALМ grid. The steady increase in thaw depth in all natural complexes is observed. It corresponds to the air temperature steady increase from the beginning of 1970^th.

SOIL DESCRIPTION: (predominant texture, i.e., ‘sand’, ‘gravel’, ‘peat’, etc.): Dystri-Cryic and Dystri-Gelic Histosols (sandy) and Sphagnic Cryofibrists

SAMPLING DESIGN AND METHOD:

1-ha grid consists of a square array of permanent stakes separated by 10 m, yielding an 11 × 11 array of sampling nodes on each grid. Thaw depth sampling was conducted at least twice by manual probing at each stake. The two (or more) values for each sampling point are averaged, yielding a maximum of 121 data points per grid per probing date.

REFERENCES:

Melnikov, E.S., Vasiliev, A.A., Leybman, M.O., Moskalenko, N.G. 2005. Active-Layer Dynamics in West Siberia. Cryosphere of Earth 9, 2, 23 -32 (in Russian, abstract in English).

Melnikov, E.S., Leibman, M.O., Moskalenko, N.G. and Vasiliev, A.A. 2004. Active-layer monitoring in the cryolithozone of West Siberia. Polar Geography 28 (4), 267-287.

Moskalenko N. 2008. Vegetation and Permafrost Changes in the Northern Taiga of West Siberia Proceedings of the Ninth International Conference on Permafrost, Fairbanks, Alaska, Vol. 1, 1245- 1251.

Vasiliev, A.A., Leibman, M.O. & Moskalenko, N.G. 2008. Active layer monitoring in West Siberia under the CALM II program. Proceedings of the Ninth International Conference on Permafrost, Fairbanks,Alaska, June 29–July 3, 2008, Vol.2, 1815-1820.

Moskalenko N.G. Natural and antropogenic dynamics of bog ecosystems in West Siberia northern taiga // Development of the North and problem of the nature recovery,2010, Syktyvkar, Biology institute Komi NC URB RАS, p. 141-148 (in Russian).

Romanovsky, V.E., Drozdov, D.S., Oberman, N.G., Malkova, G.V., Kholodov, A.L., Marchenko, S.S., Moskalenko, N.G., Sergeev, D.O., Ukrainsteva, D.G., Abramov, A.A., and Vasiliev, A.A Thermal state of permafrost in Russia. 2010 // Permafrost and Periglacial Processes, 21. P. 106-116.

Moskalenko N.G. Natural and antropogenic vegetation dynamics in West Siberia northern taiga // Development of geobotany: a history and the present. Materials of the All-Russia conference. SPb, LGU, 2011, с. 81(in Russian).

Moskalenko N.G. Impact of a fire on vegetation and permafrost of northern taiga palsa pietlands in West Siberia // Materials of the fourth conference of Russia geocryologistes in the Moscow State University of name M.V. Lomonosov, v.3, part 9, 2011, p. 238-245(in Russian).

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