|
CALM SITE U9 A |
HAPPY VALLEY 1-ha GRID |
|
Site code |
U9A |
|
Site name |
Happy
Valley |
|
CAPS I Metadata form |
GGD401 |
|
CAPS II Metadata form |
GGD313U_9 |
|
Responsible for data submission |
Vladimir
Romanovsky |
|
Email Address |
ffver”-at-“uaf.edu |
|
Institution/Organization |
University
of Alaska-Fairbanks |
|
Location description |
Arctic Alaska |
|
Location Lat. |
69 deg. 10 min. N |
|
Location Lon. |
148 deg. 50 min. W |
|
Elevation avg. (m) |
305 |
|
Methods Grid |
100 |
|
Methods Other |
Air Temperature, Soil temperature, Soil Moisture, Snow
Cover |
|
Landscape Description |
Unglaciated foothills |
|
Vegetation /Classification |
Tussock-graminoid, dwarf- shrub tundra and low-shrub tundra
(moist acidic) |
|
Soils (or Material) |
Ruptic-Histic Aquiturbel |
|
Thaw depth measurements (year started)
|
1996 |
|
Air temp. measurements (year started) |
?? |
|
Snow cover measurements (year started) |
?? |
|
soil
temp. measurements (year started) |
1997 |
|
soil moisture measurements (year started) |
?? |
|
general description of soil moisture (dry, moist, wet,
saturated) |
Moist |
|
soil texture: if non organic describe texture, if organic
indicate thickness of organic layer (cm) |
?? |
DESCRIPTION
OF AREA CONTAINING SITE:
Happy
Valley grid is located on the Unglaciated
foothills. Landcover
units include Tussock-graminoid, dwarf- shrub tundra
and low-shrub tundra (moist acidic). U9a 1-ha grid located within U9B 1-km grid.
SOIL
DESCRIPTION: (predominant texture, i.e.,
‘sand’, ‘gravel’, ‘peat’, etc.): Ruptic-Histic Aquiturbel
SAMPLING
DESIGN AND METHOD:
1
ha grid consists of a square array of surveyed permanent stakes separated by 10
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.
REFERENCES:
Walker,
D. A., H. E. Epstein, W. A. Gould, A. Kade, A.M.
Kelley, J. A. Knudson, W. B. Krantz, R. A. Peterson,
G. Michaelson, R.A. Peterson, C. L. Ping, M. A. Raynolds, V. E. Romanovsky, Y. Shur,
and M.D. Walker, Frost-boil ecosystems: complex interactions between landforms,
soils, vegetation, and climate, Permafrost and Periglacial
Processes, 15: 171-188, 2004.
Sturm,
M., Schimel, J., Michelson, G., Welker, J., Oberbauer, S. F., Liston, G. E., Fahnestock,
J., and V. E. Romanovsky, Are winter biological processes important in
converting arctic tundra to shrubland?, BioScience, Vol. 55, No. 1: 17 26, 2005.
Shimel, J. P., Fahnstock,
J., Michaelson, G. J., Mican,
C., Ping, C., Romanovsky, V. E. and J. Welker, A microbial activity based model
of winter CO2 fluxes in Arctic tundra communities, Arctic, Antarctic, and
Alpine Research,Vol. 38, No.
2, 249-256, 2006.
Kade, A., Romanovsky, V. E. and D. A.
Walker, The N-factor of nonsorted
circles along a climate gradient in Arctic Alaska, Permafrost and Periglacial Processes, 17: 279-289, 2006.
Nicolsky, D. J., Romanovsky, V. E., Alexeev, V. A. and D. M. Lawrence, Improved modeling of
permafrost dynamics in Alaska with CLM3, Geophysical Research Letters, VOL. 34,
L08501, doi:10.1029/2007GL029525, 2007.
Nicolsky, D. J., Romanovsky, V.E., and G. S.Tipenko, Using in-situ temperature measurements to
estimate saturated soil thermal properties by solving a sequence of
optimization problems, The Cryosphere, 1, 41 58,
2007.
Brown,
J. and V. E. Romanovsky, Report from the International Permafrost Association:
State of Permafrost in the First Decade of the 21st Century, Permafrost and Periglacial Processes, 19: 255 260, 2008.
Nicolsky, D. J., Romanovsky,
V.E., Tipenko, G. S., and D. A. Walker, Modeling biogeophysical interactions in non-sorted circles in the
Low Arctic, Journal of Geophysical Research, in press
Walker,
D.A., H.E. Epstein, V.E. Romanovsky, C.L. Ping, G.J. Michaelson, R.P. Daanen, Y. Shur, R.A. Peterson, W.B. Krantz,
M.K. Raynolds, W.A. Gould,
G.
Gonzalez, D.J. Nicolsky, C.M. Vonlanthen,
A.N. Kade, P. Kuss, A.M.
Kelley, C.A. Munger, C.T. Tarnocai,
N.V. Matveyeva, and F.J.A. DaniКls,
Arctic patterned-ground ecosystems: a synthesis of studies along a north
American arctic transect, Journal of Geophysical Research, in press
Nicolsky, D. J., Tipenko,
G. S., Romanovsky, V. E. and D. A. Walker, Modeling Observed Differential Frost
Heave within Non-Sorted Circles in Alaska, In Proceedings of the Ninth
International Conference on Permafrost, June 29-July 3, Fairbanks, Alaska,
2008, in press
Romanovsky,
V. E., Marchenko, S. S., Daanen, R., Nicolsky, D. J., Sergeev, D. O.,
and D. A. Walker, Soil climate and frost heave along the Permafrost/Ecological
North American Arctic Transect, In Proceedings of the Ninth International
Conference on Permafrost, June 29-July 3, Fairbanks, Alaska, 2008, in press
Only
thaw depth data determined by mechanical probing is reported on CALM website.
For additional data refer to http://www.gi.alaska.edu/snowice/Permafrost-lab/index.html
or contact site investigators directly
