Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010
The observed greening of Arctic vegetation and the expansion of shrubs in the last few decades has likely had profound implications for the tundra ecosystem, including feedbacks to climate. Uncertainty surrounding the magnitude, direction, and implications of this vegetation shift calls for monitori...
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ftmontclairstuni:oai:digitalcommons.montclair.edu:etd-1080 2023-07-23T04:17:46+02:00 Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010 Duchesne-Onoro, Rocio Raquel 2015-08-01T07:00:00Z application/pdf https://digitalcommons.montclair.edu/etd/81 https://digitalcommons.montclair.edu/context/etd/article/1080/viewcontent/Duchesne_20Dissertation_20FINAL_20153_Redacted.pdf unknown Montclair State University Digital Commons https://digitalcommons.montclair.edu/etd/81 https://digitalcommons.montclair.edu/context/etd/article/1080/viewcontent/Duchesne_20Dissertation_20FINAL_20153_Redacted.pdf Theses, Dissertations and Culminating Projects Earth Sciences Environmental Sciences text 2015 ftmontclairstuni 2023-07-03T21:54:09Z The observed greening of Arctic vegetation and the expansion of shrubs in the last few decades has likely had profound implications for the tundra ecosystem, including feedbacks to climate. Uncertainty surrounding the magnitude, direction, and implications of this vegetation shift calls for monitoring of vegetation structural parameters, such as fractional cover of shrubs. Due to the extent of the North Slope of Alaska and its extreme environments, remote sensing may be the most suitable tool to produce wall-to-wall fractional shrub cover maps for the entire region, however, most regional maps have relied on vegetation indices or needed many years worth of data to cover the whole region. Here, a new mapping approach is presented that uses satellite imagery from the Multi-angle Imaging SpectroRadiometer (MISR) sensor and some landscape variables to predict tall shrub (> 0.5 m) cover with the ultimate goal of evaluating temporal changes in tall shrub fractional cover during the period of 2010-2000. Specifically, we: 1) undertook two field surveys in the North Slope of Alaska to obtain estimates of tall shrub cover, canopy height, crown radius, and total number of shrubs at 26 sites (250 m × 250 m each); 2) evaluated the ability of the semi-automated image interpretation algorithm CANAPI - CANopy Analysis from Panchromatic Imagery, to derive structural data for tall (> 0.5 m) shrubs in the Arctic; 3) constructed a robust reference database with estimates of shrub structural parameters; 4) trained and validated the boosted regression tree model to predict tall shrub fractional cover from moderate resolution imagery; 5) created the 2000 and the 2010 tall shrub fractional cover map for the North Slope of Alaska; and 6) evaluated the changes in shrub abundance during the period 2010-2000 in the North Slope of Alaska. Results from the field surveys suggested that tall shrub fractional cover was less than 5% at 250 m scales. The evaluation of the CANAPI algorithm showed that CANAPI could successfully retrieve ... Text Arctic north slope Tundra Alaska Montclair State University Digital Commons Arctic |
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Earth Sciences Environmental Sciences Duchesne-Onoro, Rocio Raquel Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010 |
topic_facet |
Earth Sciences Environmental Sciences |
description |
The observed greening of Arctic vegetation and the expansion of shrubs in the last few decades has likely had profound implications for the tundra ecosystem, including feedbacks to climate. Uncertainty surrounding the magnitude, direction, and implications of this vegetation shift calls for monitoring of vegetation structural parameters, such as fractional cover of shrubs. Due to the extent of the North Slope of Alaska and its extreme environments, remote sensing may be the most suitable tool to produce wall-to-wall fractional shrub cover maps for the entire region, however, most regional maps have relied on vegetation indices or needed many years worth of data to cover the whole region. Here, a new mapping approach is presented that uses satellite imagery from the Multi-angle Imaging SpectroRadiometer (MISR) sensor and some landscape variables to predict tall shrub (> 0.5 m) cover with the ultimate goal of evaluating temporal changes in tall shrub fractional cover during the period of 2010-2000. Specifically, we: 1) undertook two field surveys in the North Slope of Alaska to obtain estimates of tall shrub cover, canopy height, crown radius, and total number of shrubs at 26 sites (250 m × 250 m each); 2) evaluated the ability of the semi-automated image interpretation algorithm CANAPI - CANopy Analysis from Panchromatic Imagery, to derive structural data for tall (> 0.5 m) shrubs in the Arctic; 3) constructed a robust reference database with estimates of shrub structural parameters; 4) trained and validated the boosted regression tree model to predict tall shrub fractional cover from moderate resolution imagery; 5) created the 2000 and the 2010 tall shrub fractional cover map for the North Slope of Alaska; and 6) evaluated the changes in shrub abundance during the period 2010-2000 in the North Slope of Alaska. Results from the field surveys suggested that tall shrub fractional cover was less than 5% at 250 m scales. The evaluation of the CANAPI algorithm showed that CANAPI could successfully retrieve ... |
format |
Text |
author |
Duchesne-Onoro, Rocio Raquel |
author_facet |
Duchesne-Onoro, Rocio Raquel |
author_sort |
Duchesne-Onoro, Rocio Raquel |
title |
Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010 |
title_short |
Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010 |
title_full |
Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010 |
title_fullStr |
Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010 |
title_full_unstemmed |
Changes in Tall Shrub Abundance on the North Slope of Alaska, 2000-2010 |
title_sort |
changes in tall shrub abundance on the north slope of alaska, 2000-2010 |
publisher |
Montclair State University Digital Commons |
publishDate |
2015 |
url |
https://digitalcommons.montclair.edu/etd/81 https://digitalcommons.montclair.edu/context/etd/article/1080/viewcontent/Duchesne_20Dissertation_20FINAL_20153_Redacted.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope Tundra Alaska |
genre_facet |
Arctic north slope Tundra Alaska |
op_source |
Theses, Dissertations and Culminating Projects |
op_relation |
https://digitalcommons.montclair.edu/etd/81 https://digitalcommons.montclair.edu/context/etd/article/1080/viewcontent/Duchesne_20Dissertation_20FINAL_20153_Redacted.pdf |
_version_ |
1772179784492646400 |