CALM SITE
R45 |
KRUGLAYA |
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Site
code |
R45 |
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Site
name |
Kruglaya |
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CAPS
I Metadata form |
NA |
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CAPS
II Metadata form |
NA |
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Responsible
for data submission |
Oleg Tregubov |
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Email
Address |
Tregubov2”-at-“yandex.ru |
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Institution/Organization |
Far East
Complex Research Scientific Institute RAS, Anadyr |
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Location
description |
Anadyr, Chukotka |
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Location
Lat. |
64 deg. 38 min. N |
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Location
Lon. |
176 deg. 58
min. E |
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Elevation
avg. (m) |
2.5 |
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Methods
Grid |
100 |
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Methods
Other |
Air
Temperature, Soil temperature |
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Landscape
Description |
lake-marsh basin |
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Vegetation
/Classification |
Mesic dwarf shrub-cottongrass-moss
tussock bog tundra |
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Soils
(or Material) |
Gley peat, illuvial-humus
soils |
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Thaw
depth measurements (year started)
|
2010 |
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Air
temp. measurements (year started) |
2010 |
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Snow
cover measurements (year started) |
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soil temp. measurements (year started) |
2010 |
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soil
moisture measurements (year started) |
2011 |
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general
description of soil moisture (dry, moist, wet, saturated) |
wet |
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soil
texture: if non organic describe texture, if organic indicate thickness of
organic layer (cm) |
organic
layer 25-45 cm |
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SITE DESCRIPTION The grid
“Cape Kruglaya”, 100x100 m, is located
on Lower-Anadyr (Nizhneanadyrskaya) Lowland at the south-east coast of
Onemen bay (Gniloy ugol) - 64°38¢ North and 176°58¢ East. Relief of the area is lake
bog basin with altitudes 1.5 to 2.5 m above the water level in the Bay. CALM
grid is set at the flat bottom lake-marsh basin. The surface is represented by
typical hummocky-moss tundra and sedge marsh. Hummocks are formed of cotton
grass (Erioophorum vaginatum)
dominating on dry area.
Hummock height is 10-15 cm. Here they occupy 40 to 50% of the surface,
the rest occupied by inter-hummock depressions filled sedge, green and bog
mosses (Sphagnum sp.sp.) with participation low shrub. In south-east part
of the grid wide-spread bush of the osier (Salix glauca, S. tschuktschorum), with lower tier from moss, sedge and gramineae.
Coverage of the bush tundra within the grid is 10-15 %; coverage of
moss-sedge bog tundra is 20-30 % and of hummocky-moss tundra - 70 to 55%. Main producer of ground-level phytomass is cotton grass and sedge. The grid is located in
the area of transition from moderately-continental to marine climate subzone
of the Sub-Arctic climatic zone. Mean annual air temperature at Anadyr
weather station (30 km from the grid) is -7.7oС, mean annual
precipitation is 312 mm. The hydrochemical conditions of the grid in many respects are
instituted by closeness of marine coast. The type of atmospheric
precipitation here is transitional from maritime to continental. Rain and
thawed snow water are of chloride-hydrocarbon-sodium type with mineralization
up to 45 mg/l. At inflow of thawed and rain waters into the active layer,
they get saturated by ions of calcium, magnesium and hydrocarbonate,
the mineralization rise up to 80-88 mg/l. The
grid is located in the continuous permafrost area. Taliks
of hydrogenous type are found only below the Onemen
Bay and large lakes. Mean annual ground temperature is about –5oC,
the permafrost thickness is up to 150 m. Frost cracks and ice-wedge, and
spot-medallion formation are periglacial features
developed within the grid. At the adjacent area, the coastal processes are
spread: coastal thermoerosion, thermocircues
connected with massive ground ice occurrence. Cryolithological
structure of permafrost is variable. Immediately beneath the active layer
modern ice wedges are lying, up to 1 m wide and up to 2 m high. SOIL
DESCRIPTION:
(predominant texture, i.e., ‘sand’, ‘gravel’,
‘peat’, etc.): Soils of grid are gley
peat, gley illuvial-humus
with poorly developed (up to 45, rarely to 25 cm) organic horizon underlain
by peaty silt. Below lies illuvial horizon, frozen loam or turf.
In base of soils lake-alluvial sediment Holocene water-glacial rocks Late-Pleistocene |
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SAMPLING
DESIGN AND METHOD:
Permanent 100x100
m grids have been established, with 10-m intervals between grid nodes. Thaw
depths were determined at each grid node (121) using a steel rod. The
measurements of the active-layer thickness were performed according to the CALM
procedure from 2010 to present.
REFERENCES: