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Radon 222 tracing of soil and forest canopy trace gas exchange in an open canopy boreal forestA set of continuous, high-resolution atmospheric radon (Rn-222) concentration time series and radon soil flux measurements were acquired during the summer of 1990 at a micrometeorological tower site 13 km northwest of Schefferville, Quebec, Canada. The tower was located in a dry upland, open-canopy lichen-spruce woodland. For the period July 23 to August 1, 1990, the mean radon soil flux was 41.1 +/- 4.8 Bq m(exp -2)/h. Radon surface flux from the two end-member forest floor cover types (lichen mat and bare soil) were 38.8 +/- 5.1 and 61.8 +/- 15.6 Bq m(exp -2)/h, respectively. Average total forest canopy resistances computed using a simple 'flux box' model for radon exchange between the forest canopy and the overlying atmosphere range from 0.47 +/- 0.24 s cm(exp -1) to 2.65 +/- 1.61 cm(exp -1) for daytime hours (0900-1700 LT) and from 3.44 +/- 0.91 s cm(exp -1) to 10.55 +/- 7.16 s cm(exp -1) for nighttime hours (2000-0600) for the period July 23 to August 6, 1990. Continuous radon profiling of canopy atmospheres is a suitable approach for determining rates of biosphere/atmosphere trace gas exchange for remote field sites where daily equipment maintenance is not possible. where daily equipment maintenance is not possible.
Document ID
19950031293
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ussler, William, III
(Univ. of North Carolina, Chapel Hill, NC United States)
Chanton, Jeffrey P.
(Florida State Univ. Tallahassee, FL, United States)
Kelley, Cheryl A.
(Univ. of North Carolina, Chapel Hill, NC United States)
Martens, Christopher S.
(Univ. of North Carolina, Chapel Hill, NC United States)
Date Acquired
August 16, 2013
Publication Date
January 20, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: D1
ISSN: 0148-0227
Subject Category
Meteorology And Climatology
Accession Number
95A62892
Funding Number(s)
CONTRACT_GRANT: NAGW-1823
CONTRACT_GRANT: NAGW-1455
CONTRACT_GRANT: NAGW-834
Distribution Limits
Public
Copyright
Other

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