The suitability of using Landsat TM-5 Images for estimating chromophoric dissolved organic matter in subarctic Lakes
(2014) In Student thesis series INES NGEK01 20132Dept of Physical Geography and Ecosystem Science
- Abstract
- Recent trends of permafrost thawing in the subarctic are expected to cause increased release of dissolved organic carbon (DOC) to inland waters, which might have cascading effects on downstream aquatic ecosystems and release of CO2 to the atmosphere. This study therefore aimed at evaluating the applicability of an empirical band ratio algorithm for estimating chromophoric dissolved organic matter (CDOM; a proxy for DOC) from the easily accessible satellite images Landsat TM-5, to counter the inaccessibility of the region in general. The study targeted 14 smaller lakes in the Stordalen catchment in northern Sweden where values of CDOM absorbance had been obtained from the summer of 2009 that could be used to evaluate algorithm suitability.... (More)
- Recent trends of permafrost thawing in the subarctic are expected to cause increased release of dissolved organic carbon (DOC) to inland waters, which might have cascading effects on downstream aquatic ecosystems and release of CO2 to the atmosphere. This study therefore aimed at evaluating the applicability of an empirical band ratio algorithm for estimating chromophoric dissolved organic matter (CDOM; a proxy for DOC) from the easily accessible satellite images Landsat TM-5, to counter the inaccessibility of the region in general. The study targeted 14 smaller lakes in the Stordalen catchment in northern Sweden where values of CDOM absorbance had been obtained from the summer of 2009 that could be used to evaluate algorithm suitability. The satellite image type and algorithm have been successfully applied to predict CDOM in previous studies of lakes with relatively high absorbance, but in this study no significant correlations were found between the in situ measured and the remote sensing estimates for the studied lakes (in situ aCDOM (440) = 0.29 - 1.22 m-1; R2 ≤ 0.21); except for when lakes with certain characteristics were tested separately (shallow lakes R2 = 0.86). It was concluded that Landsat TM-5 images are not generally suitable for estimating CDOM in the Stordalen area. However higher quality satellite products probably would; since with a higher ground-, spectral- and radiometric resolution some disturbances could be reduced, more lakes could be included in the study and they would be more accurately recorded. Nonetheless more in situ collected data is needed for supporting the discussed deductions and for adaptive algorithm modifications. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/4281362
- author
- Jakobsson, Julia LU
- supervisor
- organization
- course
- NGEK01 20132
- year
- 2014
- type
- M2 - Bachelor Degree
- subject
- keywords
- CDOM, dissolved organic carbon, colored dissolved organic matter, Chromophoric, landsat thematic mapper 5, subarctic lakes, Stordalen, empirical algorithm., Abisko, DOC, remote sensing, Physical Geography and Ecosystem Science
- publication/series
- Student thesis series INES
- report number
- 299
- language
- English
- additional info
- External technical supervisor: Sam Kallaghi, Center for Geographical Information Systems, Lund University
- id
- 4281362
- date added to LUP
- 2014-02-24 13:35:35
- date last changed
- 2014-02-24 13:35:35
@misc{4281362, abstract = {{Recent trends of permafrost thawing in the subarctic are expected to cause increased release of dissolved organic carbon (DOC) to inland waters, which might have cascading effects on downstream aquatic ecosystems and release of CO2 to the atmosphere. This study therefore aimed at evaluating the applicability of an empirical band ratio algorithm for estimating chromophoric dissolved organic matter (CDOM; a proxy for DOC) from the easily accessible satellite images Landsat TM-5, to counter the inaccessibility of the region in general. The study targeted 14 smaller lakes in the Stordalen catchment in northern Sweden where values of CDOM absorbance had been obtained from the summer of 2009 that could be used to evaluate algorithm suitability. The satellite image type and algorithm have been successfully applied to predict CDOM in previous studies of lakes with relatively high absorbance, but in this study no significant correlations were found between the in situ measured and the remote sensing estimates for the studied lakes (in situ aCDOM (440) = 0.29 - 1.22 m-1; R2 ≤ 0.21); except for when lakes with certain characteristics were tested separately (shallow lakes R2 = 0.86). It was concluded that Landsat TM-5 images are not generally suitable for estimating CDOM in the Stordalen area. However higher quality satellite products probably would; since with a higher ground-, spectral- and radiometric resolution some disturbances could be reduced, more lakes could be included in the study and they would be more accurately recorded. Nonetheless more in situ collected data is needed for supporting the discussed deductions and for adaptive algorithm modifications.}}, author = {{Jakobsson, Julia}}, language = {{eng}}, note = {{Student Paper}}, series = {{Student thesis series INES}}, title = {{The suitability of using Landsat TM-5 Images for estimating chromophoric dissolved organic matter in subarctic Lakes}}, year = {{2014}}, }