Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve
There are hundreds of glaciers in Kenai Fjords National Park (KEFJ) and Katmai National Park and Preserve (KATM) covering over 2276 sq km of park land (circa 2000). There are two primary glacierized areas in KEFJ -- the Harding Icefield and the Grewingk-Yalik Glacier Complex, and three primary glaci...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20120003718 2023-05-15T16:20:31+02:00 Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve Giffen, bruce A. Chien, Janet Y. L. Hall, Dorothy K. Unclassified, Unlimited, Publicly available [2011] application/pdf http://hdl.handle.net/2060/20120003718 unknown Document ID: 20120003718 http://hdl.handle.net/2060/20120003718 Copyright, Distribution as joint owner in the copyright CASI Geophysics GSFC.BOOK.5818.2011 2011 ftnasantrs 2019-07-21T06:22:45Z There are hundreds of glaciers in Kenai Fjords National Park (KEFJ) and Katmai National Park and Preserve (KATM) covering over 2276 sq km of park land (circa 2000). There are two primary glacierized areas in KEFJ -- the Harding Icefield and the Grewingk-Yalik Glacier Complex, and three primary glacierized areas in KATM - the Mt. Douglas area, the Kukak Volcano to Mt. Katmai area and the Mt. Martin area. Most glaciers in these parks terminate on land, though a few terminate in lakes. Only KEFJ has tidewater glaciers, which terminate in the ocean. Glacier mapping and analysis of the change in glacier extent has been accomplished on a decadal scale using satellite imagery, primarily Landsat data from the 1970s, 1980s, and from 2000. Landsat Multispectral Scanner (MSS), Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) imagery was used to map glacier extent on a park-wide basis. Classification of glacier ice using image processing software, along with extensive manual editing, was employed to create Geographic Information System (GIS) outlines of the glacier extent for each park. Many glaciers that originate in KEFJ but terminate outside the park boundaries were also mapped. Results of the analysis show that there has been a reduction in the amount of glacier ice cover in the two parks over the study period. Our measurements show a reduction of approximately 21 sq km, or -1.5% (from 1986 to 2000), and 76 sq km, or -7.7% (from 1986/87 to 2000), in KEFJ and KATM, respectively. This work represents the first comprehensive study of glaciers of KATM. Issues that complicate the mapping of glacier extent include: debris-cover (moraine and volcanic ash), shadows, clouds, fresh snow, lingering snow from the previous season, and differences in spatial resolution between the MSS and TM or ETM+ sensors. Similar glacier mapping efforts in western Canada estimate mapping errors of 3-4%. Measurements were also collected from a suite of glaciers in KEFJ and KATM detailing terminus positions and rates of recession using datasets including the 15-minute USGS quadrangle maps (1950/1951), Landsat imagery (1986/1987, 2000, 2006) and 2005 Ikonos imagery (KEFJ only). Other/Unknown Material glacier glacier* glaciers Tidewater Alaska NASA Technical Reports Server (NTRS) Canada Quadrangle ENVELOPE(-68.578,-68.578,-71.577,-71.577) Harding ENVELOPE(75.033,75.033,-72.900,-72.900) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Geophysics |
spellingShingle |
Geophysics Giffen, bruce A. Chien, Janet Y. L. Hall, Dorothy K. Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve |
topic_facet |
Geophysics |
description |
There are hundreds of glaciers in Kenai Fjords National Park (KEFJ) and Katmai National Park and Preserve (KATM) covering over 2276 sq km of park land (circa 2000). There are two primary glacierized areas in KEFJ -- the Harding Icefield and the Grewingk-Yalik Glacier Complex, and three primary glacierized areas in KATM - the Mt. Douglas area, the Kukak Volcano to Mt. Katmai area and the Mt. Martin area. Most glaciers in these parks terminate on land, though a few terminate in lakes. Only KEFJ has tidewater glaciers, which terminate in the ocean. Glacier mapping and analysis of the change in glacier extent has been accomplished on a decadal scale using satellite imagery, primarily Landsat data from the 1970s, 1980s, and from 2000. Landsat Multispectral Scanner (MSS), Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) imagery was used to map glacier extent on a park-wide basis. Classification of glacier ice using image processing software, along with extensive manual editing, was employed to create Geographic Information System (GIS) outlines of the glacier extent for each park. Many glaciers that originate in KEFJ but terminate outside the park boundaries were also mapped. Results of the analysis show that there has been a reduction in the amount of glacier ice cover in the two parks over the study period. Our measurements show a reduction of approximately 21 sq km, or -1.5% (from 1986 to 2000), and 76 sq km, or -7.7% (from 1986/87 to 2000), in KEFJ and KATM, respectively. This work represents the first comprehensive study of glaciers of KATM. Issues that complicate the mapping of glacier extent include: debris-cover (moraine and volcanic ash), shadows, clouds, fresh snow, lingering snow from the previous season, and differences in spatial resolution between the MSS and TM or ETM+ sensors. Similar glacier mapping efforts in western Canada estimate mapping errors of 3-4%. Measurements were also collected from a suite of glaciers in KEFJ and KATM detailing terminus positions and rates of recession using datasets including the 15-minute USGS quadrangle maps (1950/1951), Landsat imagery (1986/1987, 2000, 2006) and 2005 Ikonos imagery (KEFJ only). |
format |
Other/Unknown Material |
author |
Giffen, bruce A. Chien, Janet Y. L. Hall, Dorothy K. |
author_facet |
Giffen, bruce A. Chien, Janet Y. L. Hall, Dorothy K. |
author_sort |
Giffen, bruce A. |
title |
Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve |
title_short |
Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve |
title_full |
Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve |
title_fullStr |
Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve |
title_full_unstemmed |
Alaska: Glaciers of Kenai Fjords National Park and Katmai and Lake Clark National Parks and Preserve |
title_sort |
alaska: glaciers of kenai fjords national park and katmai and lake clark national parks and preserve |
publishDate |
2011 |
url |
http://hdl.handle.net/2060/20120003718 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-68.578,-68.578,-71.577,-71.577) ENVELOPE(75.033,75.033,-72.900,-72.900) |
geographic |
Canada Quadrangle Harding |
geographic_facet |
Canada Quadrangle Harding |
genre |
glacier glacier* glaciers Tidewater Alaska |
genre_facet |
glacier glacier* glaciers Tidewater Alaska |
op_source |
CASI |
op_relation |
Document ID: 20120003718 http://hdl.handle.net/2060/20120003718 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766008431314993152 |