Glims airialphotos9/5/2023 The photo was taken from a height of 630 meters and is a depiction of Boston.Īerial photography is best defined as the art of taking photographs of the ground from an airborne platform including both traditional and modern platforms. Interestingly, however, two American citizens are responsible for the oldest surviving aerial photo taken in 1860. As glacial ice is diminished, the moderating influence.Aerial photography as a technique first emerged in France. ![]() When in equilibrium, glaciers reduce interannual variability of water by storing water during cold years and releasing it during warm years (Jimenez Cisneros 2014). Glaciers strongly affect the discharge of sediment and water downstream, and thereby influence the ecology of riparian and lacustrine habitats within their drainage basins. For southwestern Alaska, however, it is likely that the largest impacts of glacier diminution are ecological. These documents emphasize that most glaciers are in precipitous decline, and with their decline, some regions will or are already experiencing significant impacts on water resources. 2014) and the 5th Assessment of the Intergovernmental Panel on Climate Change (Vaughan et al. The links between climate change and water supplies were underscored for the United States and the world as a whole by the recent National Climate Assessment (Walsh et al. It is broadly accepted that water issues will be the most significant natural resource concerns of the 21st century (International Association of Hydrological Sciences/United Nations Educational, Scientific and Cultural Organization 1998). Glaciers also serve as repositories of 75% of Earth's freshwater, influencing sea levels globally and contributing to regional hydrologic regimes. Glaciers provide information on climate regimes from both modern-day and prehistoric time perspectives. 2013.) Glaciers respond sensitively to climate, contracting as summer temperature rises or as winter precipitation decreases, or both. (*) Corresponding author: over a century, glaciers have been recognized as useful indicators of climatic change (International Union of Geodesy and Geophysics (Commission on Cryospheric Sciences), United Nations Environment Programme and United Nations Educational, Scientific and Cultural Organization 2005 Vaughan et al. The findings and conclusions in this article are those of the author(s) and do not necessarily represent the views of the U.S. Citation of the source, as given above, is requested. doi: 10.3996/012014-JFWM-008Ĭopyright: All material appearing in the Journal of Fish and Wildlife Management is in the public domain and may be reproduced or copied without permission unless specifically noted with the copyright symbol. Historical retreat of alpine glaciers in the Ahklun Mountains, western Alaska. Received: JanuAccepted: DecemPublished Online Early: January 2015 Published: June 2015Ĭitation: Walsh P, Kaufman D, McDaniel T, Chowdhry Beeman J. Keywords: Ahklun Mountains Alaska glaciers recession At this rate, it is likely that all Ahklun Mountain glaciers will be extinguished by the end of the current century. Using aerial imagery of a subset of 76 glaciers at three time steps between 19, we determined the average rate of areal loss was 45% over 52 y. Of 109 glaciers originally mapped, 10 (9%) had disappeared. We surveyed for presence or absence of the glaciers by fixed-wing aircraft in 2006. Geological Survey using photogrammetry methods based on 1972-1973 aerial photos. The glaciers were originally mapped by the U.S. The Ahklun Mountains support the only extant glaciers in southwestern Alaska north of the Alaska Peninsula.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |