Temporal and spatial variability of methane emissions from Alaskan Arctic tundra Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1r66j3168

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Methane flux was measured from northern Alaska Arctic Coastal Plain wetlands to assess the spatial and temporal variability of Arctic tundra emissions during the summers of 1987 through 1990. Initially, the role of vegetation in the release of methane from substrate to atmosphere was assessed. Methane emissions were shown to be proportional to the foliage surface area and release of methane from plants controlled by the stomata. Daily values of methane emissions and leaf conductance were correlated (r = 0.95). A satellite-derived regional methane flux estimate had 3 to 5 times greater precision than estimates based on direct expansion. Methane emissions from the tundra exhibit high temporal variability at hourly, daily, seasonal, and annual scales of observation. Daily variability in methane emissions was low near the summer solstice and increased through the growing season. Strong seasonal variation in emissions was related to the position of the local water table, the amount of leaf area above the water, and plant phenological development. An interannual comparison of emissions provided insight into the local and regional scale responses of Arctic tundra to potential climatic warming. Methane emissions in 1989, a warm year, were over three fold greater than in 1987, a "normal" year. Temperaturedependent increases in methane emissions expected as a result of climatic warming are projected to exceed increases due to a longer growing season. The potential for strong positive biological feedback exists whereby the enhanced emissions of methane, a greenhouse gas, to the atmosphere may further accelerate rates of regional and global climatic warming.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • Master files scanned at 600 ppi (24-bit Color and 256 greyscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (24-bit Color and 256 greyscale and 256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-07-22T19:37:41Z (GMT) No. of bitstreams: 1 Morrissey_Leslie_A_1992.pdf: 4659511 bytes, checksum: a542179c30a6fb75f112cbf36170f5a6 (MD5)
  • description.provenance : Submitted by Sara Mintonye (smscanner@gmail.com) on 2008-07-11T16:06:48Z No. of bitstreams: 1 Morrissey_Leslie_A_1992.pdf: 4659511 bytes, checksum: a542179c30a6fb75f112cbf36170f5a6 (MD5)
  • description.provenance : Made available in DSpace on 2008-07-22T19:37:41Z (GMT). No. of bitstreams: 1 Morrissey_Leslie_A_1992.pdf: 4659511 bytes, checksum: a542179c30a6fb75f112cbf36170f5a6 (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-07-22T19:34:48Z (GMT) No. of bitstreams: 1 Morrissey_Leslie_A_1992.pdf: 4659511 bytes, checksum: a542179c30a6fb75f112cbf36170f5a6 (MD5)

Relationships

In Administrative Set:
Last modified: 08/02/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items