GGD314 Seasonal thawing of palsas in Finnish Lapland Investigator Matti Seppala matti.seppala@helsinki.fi

University of Helsinki

Department of Geography

Hallituskatu 11

Helsinki SF-00100 Finland Technical Contact Maria Ronkko maria.ronkko@helsinki.fi 358 9 191 51060 358 9 191 50 760

University of Helsinki

Laboratory of Physical Geography

P.O. Box 64

Helsinki 00014 Finland EARTH SCIENCE Atmosphere Atmospheric Pressure Surface Pressure EARTH SCIENCE Atmosphere Atmospheric Radiation Outgoing Longwave Radiation EARTH SCIENCE Atmosphere Atmospheric Radiation Solar Radiation EARTH SCIENCE Atmosphere Atmospheric Temperature Air Temperature EARTH SCIENCE Atmosphere Atmospheric Temperature Surface Air Temperature EARTH SCIENCE Atmosphere Atmospheric Water Vapor Humidity EARTH SCIENCE Atmosphere Atmospheric Winds Surface Winds EARTH SCIENCE Land Surface Soils Soil Temperature Active Layer Peat Seasonal Freeze/thaw Thermal Properties 1972-01-01 1982-12-31 68 70 21 28 CONTINENT EUROPE NORTHERN EUROPE SCANDANAVIA FINLAND FINNISH LAPLAND English NSIDC_FGDC NSIDC Frozen Ground Data Center http://nsidc.org/fgdc/ Data Center Contact NSIDC FGDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA Seppala, M. 1983. Seasonal thawing of palsas in Finnish Lapland. International Permafrost Conference, 4th. Proceedings, p. 1127-1132.

This study investigates the thickness of the active layer of palsas in northernmost Finland and temporal, local, and regional differences in the thawing of palsas there. (Seppala 1983). Probes of frost depth were made over a 9-year period, a total of 185 measurements in 17 palsa bogs at sites ranging from 50 - 490 m in altitude. Thermal gradients were also measured ; weather observations were taken at two sites.

CEOS IDN DIF 9.7 2003-05-12 2005-01-24