{"id":325,"date":"2022-03-02T14:28:28","date_gmt":"2022-03-02T13:28:28","guid":{"rendered":"https:\/\/www.eovision.at\/esa-schoolatlas\/?page_id=325"},"modified":"2025-03-03T13:55:06","modified_gmt":"2025-03-03T12:55:06","slug":"columbia-glacier","status":"publish","type":"page","link":"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/de\/system-erde\/columbia-glacier\/","title":{"rendered":"Columbia-Gletscher"},"content":{"rendered":"<h2>R&#xFC;ckzug eines Gezeitengletschers<\/h2>\n<p><iframe src=\"https:\/\/esa-schoolatlas.eu\/wp-content\/gismaps_maps\/cli04_1_columbia-glacier\/index.html\" width=\"100%\" height=\"670\"><\/iframe><\/p>\n<h3>Hintergrund<\/h3>\n<p>Seit einigen Jahrzehnten sind rund um die Erde Gletscher auf dem R&#xFC;ckzug, ein Ph&#xE4;nomen, das direkt mit dem Temperaturanstieg durch den Klimawandel im Zusammenhang steht.<\/p>\n<p>Der R&#xFC;ckzug einiger Gezeitengletscher, das sind Gletscher, deren Zunge bis ins Meer reicht, ist spektakul&#xE4;r. Gezeitengletscher gibt es zum Beispiel in Alaska, in Patagonien und entlang der K&#xFC;ste Gr&#xF6;nlands. Diese Gletscher enden direkt auf Meeresniveau, wo es im Sommer verh&#xE4;ltnism&#xE4;&#xDF;ig warm ist. Daher geh&#xF6;ren die Endbereiche dieser Gletscher zu den am raschesten flie&#xDF;enden Eisstr&#xF6;men der Erde. Die Endzone der Gletscherzungen schwimmt auf dem Eis auf und folgt dem Auf und Ab der Gezeiten. Diese Bewegung f&#xF6;rdert das Brechen des Eises und in der Folge das Kalben von Eisbergen, die ins Meer getrieben werden.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" style=\"vertical-align: middle; margin: 0px 20px;\" src=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2022\/03\/Columbia_Glacier-610x407.jpg\" alt=\"\" width=\"300\" height=\"200\" align=\"right\"\/><\/p>\n<p>Der Columbia-Gletscher liegt im nordamerikanischen Alaska. Ausgehend von einer H&#xF6;he von mehr als 3000 Metern &#xFC;ber dem Meer flie&#xDF;t er talw&#xE4;rts und endet im Prince-William-Sund an der K&#xFC;ste des Pazifischen Ozeans. Lange Zeit lag das Ende des Gletschers stabil an der M&#xFC;ndung der Columbia-Bay. In den 1980er-Jahren kam Bewegung in die Angelegenheit, seither hat sich das Gletscherende um mehr als 20 Kilometer landeinw&#xE4;rts zur&#xFC;ckgezogen.<\/p>\n<p>Der Columbia-Gletscher verdeutlicht, wie die Kombination mehrerer Effekte zu einer sehr dynamischen Entwicklung f&#xFC;hren kann. Anfangs lag das Gletscherende stabil auf der Schotterbank der Endmor&#xE4;ne auf, wodurch auch der Sund vom Meerwasser getrennt blieb. Nach der Anfangsphase des Gletscherr&#xFC;ckzugs lag sein Ende frei auf dem Wasser auf, sodass die Gezeitenkr&#xE4;fte st&#xE4;rker wirken konnten und so die Geschwindigkeit des Eisr&#xFC;ckzugs erh&#xF6;hten. Dies wurde noch dadurch unterst&#xFC;tzt, dass w&#xE4;rmeres Meerwasser zwischen den Untergrund und das Eis drang und es auch von dieser Seite schmolz.<\/p>\n<h3>&#xDC;bungen<\/h3>\n<ul>\n<li>Satellitenkarte:\n<ul>\n<li>W&#xE4;hle das Satellitenbild von 2019 aus. Beschreibe die Strukturen, die du im Bild erkennen kannst. Wo siehst du Berge, Gletscher, Wasserfl&#xE4;chen und mit Vegetation bedeckte Fl&#xE4;chen? Was sind die graubraunen Fl&#xE4;chen um die und auf den Gletschern?<\/li>\n<li>Vergleiche die Satellitenbilder in der Satellitenkarte und beschreibe, wie sich die Gletscher ver&#xE4;ndert haben. Zieht sich nur das Ende der Gletscherzunge zur&#xFC;ck oder sind auch weiter oben &#xC4;nderungen zu erkennen?<\/li>\n<li>Betrachte die eisfreien Wasserfl&#xE4;chen. Was kannst du &#xFC;ber die Farbe der Wasseroberfl&#xE4;che sagen? Welche Gr&#xFC;nde k&#xF6;nnten f&#xFC;r die Farbunterschiede verantwortlich sein?<\/li>\n<\/ul>\n<\/li>\n<li>EO Browser:\n<ul>\n<li>&#xD6;ffne den EO Browser.<\/li>\n<li>Suche im EO Browser nach den aktuellsten Aufnahmen des Columbia-Gletschers.<\/li>\n<li>Stelle diese Aufnahme in naturnahen Farben dar und vergleiche mit den Bildern in der Satellitenbildkarte. Welche Unterschiede kannst du feststellen? Was sind m&#xF6;gliche Ursachen f&#xFC;r diese Unterschiede?<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Quellen und Links<\/h3>\n<ul>\n<li><a class=\"glossaryLink\"  title=\"Glossary: ESA\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;ESA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;The European Space Agency&lt;\/div&gt;\"  href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/de\/glossary\/esa\/\"  target=\"_blank\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>ESA<\/a> Video: <a href=\"https:\/\/www.esa.int\/ESA_Multimedia\/Videos\/2018\/05\/Earth_from_Space_Columbia_Glacier\">https:\/\/www.esa.int\/ESA_Multimedia\/Videos\/2018\/05\/Earth_from_Space_Columbia_Glacier<\/a><\/li>\n<li>ESA Satellitenbild: <a href=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/05\/Columbia_Glacier\">https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/05\/Columbia_Glacier<\/a><\/li>\n<li><a class=\"glossaryLink\"  title=\"Glossary: NASA\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;NASA&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;National Aeronautics and Space Administration - NASA, established in 1958 with Headquarters in Washington D.C., is the agency responsible for the public space program of the USA. Its mission is to plan, direct, and conduct aeronautical and space activities.&lt;\/div&gt;\"  href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/de\/glossary\/nasa\/\"  target=\"_blank\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>NASA<\/a> Animation: <a href=\"https:\/\/earthobservatory.nasa.gov\/world-of-change\/ColumbiaGlacier\">https:\/\/earthobservatory.nasa.gov\/world-of-change\/ColumbiaGlacier<\/a><\/li>\n<\/ul>\n<p>&#xA0;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R&#xFC;ckzug eines Gezeitengletschers Hintergrund Seit einigen Jahrzehnten sind rund um die Erde Gletscher auf dem R&#xFC;ckzug, ein Ph&#xE4;nomen, das direkt mit dem Temperaturanstieg durch den Klimawandel im Zusammenhang steht. Der R&#xFC;ckzug einiger Gezeitengletscher, das sind Gletscher, deren Zunge bis ins Meer reicht, ist spektakul&#xE4;r. Gezeitengletscher gibt es zum Beispiel in Alaska, in Patagonien und entlang [&#x2026;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":103,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-325","page","type-page","status-publish","hentry"],"translation":{"provider":"WPGlobus","version":"3.0.0","language":"de","enabled_languages":["en","es","de","fr","it"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"de":{"title":true,"content":true,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"it":{"title":false,"content":false,"excerpt":false}}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Columbia-Gletscher - ESA Schoolatlas<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/de\/system-erde\/columbia-glacier\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Columbia-Gletscher - 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