{"id":2223,"date":"2025-02-05T13:50:48","date_gmt":"2025-02-05T12:50:48","guid":{"rendered":"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/?page_id=2223"},"modified":"2025-03-03T13:56:43","modified_gmt":"2025-03-03T12:56:43","slug":"iceberg-a23a","status":"publish","type":"page","link":"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/cryosphere\/iceberg-a23a\/","title":{"rendered":"Iceberg A23a"},"content":{"rendered":"<h2>Icebergs on the Move<\/h2>\n<p><iframe src=\"https:\/\/esa-schoolatlas.eu\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/index.html\" width=\"100%\" height=\"650\"><\/iframe><\/p>\n<p>The large tabular iceberg A23a calved from the Filchner&#x2013;Ronne Ice Shelf in 1986. After its calving, the research base Druzhnaya I, which was placed on this iceberg, had to be removed and was renamed to Druzhnaya III. For many years the iceberg remained stuck on the seabed before it started moving in 2020. With an area of almost 4,000 square kilometres, it was by 2024 one of the largest icebergs ever monitored.<\/p>\n<p>Late in 2020, A23a started its journey towards north, roughly following the coastline of the Antarctic Peninsula. In November 2023, the iceberg moved past the northern tip of the Antarctic Peninsula, heading toward north. During its tour away from Antarctica, A23a will reach warmer waters and will subsequently melt.<\/p>\n<p>While the dissolution of the ice shelves does not directly contribute to the seawater level (the melted water replaces only the volume of the submerged part of the ice), it plays an important indirect role as the shelves function as a stabilising barrier for the glaciers flowing towards the sea. A loss of this barrier can lead to an enhanced ice flow.<\/p>\n<p>&#xA0;<\/p>\n<h3>Exercises<\/h3>\n<ul>\n<li><strong><a class=\"glossaryLink\" title=\"Glossary: satellite\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;satellite&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;A free-flying object orbiting the Earth, another planet, or the sun.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/glossary\/satellite\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Satellite<\/a> Map:<\/strong>\n<ul>\n<li>Look at the satellite map and <strong>zoom in<\/strong> to the true colour <a class=\"glossaryLink\" title=\"Glossary: Sentinel\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Sentinel&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Series of six different Earth Observation satellite types under responsibility of ESA in the Copernicus programme.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/glossary\/sentinel\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Sentinel<\/a>-3 image of the iceberg. Which different features and landcover types can you identify? How can you discern them? Hint: open water appears in very dark blue, drifting ice in a blueish white, and large icebergs in white; ice and snow on land can be identified by the relief they show. Additionally, clouds cover parts of the image.<\/li>\n<li>Look at the iceberg A23a in the upper part of the map. Use the <strong>measure tool<\/strong> to determine (i) its width and (ii) estimate its area. Compare the measured values with features in your home region, e.g. your home town.<\/li>\n<li>Use the layer selector to switch on the layer group &#x201C;Sentinel-1 data&#x201D;. Select and deselect the individual radar image layers and compare them with the optical Sentinel-3 image. How are ice and water surfaces represented in the radar images?<\/li>\n<li>Look at the map below showing the path of the iceberg. Use the measure tool to give an estimation of the length of the way the iceberg drifted during 2022 and 2023.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong><a class=\"glossaryLink\" title=\"Glossary: Copernicus\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Copernicus&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Former name GMES (Global Monitoring for Environment and Security), the EU&#x2019;s Copernicus Earth observation programme, comprising in-situ elements (measurement tools) and the space segment (satellites).&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/glossary\/copernicus\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Copernicus<\/a> Browser:<\/strong>\n<ul>\n<li>Open the case study area in the <a href=\"https:\/\/link.dataspace.copernicus.eu\/vsni\" target=\"_blank\" rel=\"noopener\">Copernicus Browser<\/a>.<\/li>\n<li>Find the most recent Sentinel-2 dataset covering the area displayed in the satellite map.<\/li>\n<li>Select a true colour visualisation.<\/li>\n<li>Can you identify additional, recent changes in the area?<\/li>\n<li>Select the <a class=\"glossaryLink\" title=\"Glossary: false colour\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;false colour&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;A colour imaging process which produces an image of a colour that does not correspond to the true or natural colour of the scene (as seen by our eyes). In Earth observation often used e.g. with infrared data (False colour Infrared, FIR).&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/glossary\/false-colour\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">false colour<\/a> infrared representation. Can you identify the land-use of the most intensely vegetated areas (represented by bright red colours)?<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&#xA0;<\/p>\n<h3>Links and Sources<\/h3>\n<table style=\"background-color: #444444;\">\n<tbody>\n<tr>\n<td style=\"vertical-align: middle; padding-left: 10px;\"><strong>Downloads:<\/strong><\/td>\n<td><\/td>\n<\/tr><tr>\n<td align=\"center\"><img decoding=\"async\" class=\"wp-image-1439\" src=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-150x150.png\" alt=\"\" width=\"25\" height=\"25\" srcset=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-150x150.png 150w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-152x150.png 152w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-80x80.png 80w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-300x300.png 300w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4.png 320w\" sizes=\"(max-width: 25px) 100vw, 25px\"\/><\/td>\n<td>\nPDF document of the case study (includes exercises):<br>\n<a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/CRY04_1_EN_Iceberg-A23a.pdf\" target=\"_blank\" rel=\"noopener\">English<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/CRY04_1_DE_Iceberg-A23a.pdf\" target=\"_blank\" rel=\"noopener\"> German<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/CRY04_1_FR_Iceberg-A23a.pdf\" target=\"_blank\" rel=\"noopener\"> French<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/CRY04_1_IT_Iceberg-A23a.pdf\" target=\"_blank\" rel=\"noopener\"> Italian<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/CRY04_1_ES_Iceberg-A23a.pdf\" target=\"_blank\" rel=\"noopener\"> Spanish<\/a>\n<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\n<img decoding=\"async\" class=\"wp-image-1439\" src=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-150x150.png\" alt=\"\" width=\"25\" height=\"25\" srcset=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-150x150.png 150w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-152x150.png 152w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-80x80.png 80w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4-300x300.png 300w, https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/uploads\/sites\/7\/2023\/11\/pdf-icon-4.png 320w\" sizes=\"(max-width: 25px) 100vw, 25px\"\/>\n<\/td>\n<td>\nThis case study is covered on page 45 of the printed <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\/glossary\/esa\/\"  target=\"_blank\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>ESA<\/a> Schoolatlas &ndash; download the PDF document of the page:<br>\n<a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/ESA_Schoolatlas_EN_Page45.pdf\" target=\"_blank\" rel=\"noopener\">English<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/ESA_Schoolatlas_DE_Page45.pdf\" target=\"_blank\" rel=\"noopener\">German<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/ESA_Schoolatlas_FR_Page45.pdf\" target=\"_blank\" rel=\"noopener\">French<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/ESA_Schoolatlas_IT_Page45.pdf\" target=\"_blank\" rel=\"noopener\">Italian<\/a>, <a href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/wp-content\/gismaps_maps\/cry04_1_iceberg-a23a\/ESA_Schoolatlas_ES_Page45.pdf\" target=\"_blank\" rel=\"noopener\">Spanish<\/a>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table style=\"background-color: #444444;\">\n<tbody>\n<tr>\n<td style=\"vertical-align: middle; padding-left: 10px;\"><strong>Links:<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"padding-left: 10px;\">\n<ul>\n<li>Collection of Sentinel-1 images of iceberg A23a:<br>\n<a href=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2023\/12\/Iceberg_on_the_loose\" target=\"_blank\">https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2023\/12\/Iceberg_on_the_loose<\/a> <\/li>\n<li>ESA video on iceberg A23a:<br>\n<a href=\"https:\/\/www.esa.int\/ESA_Multimedia\/Videos\/2024\/01\/World_s_largest_iceberg_drifts_beyond_Antarctic_waters\" target=\"_blank\">https:\/\/www.esa.int\/ESA_Multimedia\/Videos\/2024\/01\/World_s_largest_iceberg_drifts_beyond_Antarctic_waters<\/a> <\/li>\n<li>A23a is not the only iceberg starting from the Antarctic ice shelves, as the Sentinel-1 image of iceberg A76 shows:<br>\n<a href=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2021\/05\/Meet_the_world_s_largest_iceberg\" target=\"_blank\">https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2021\/05\/Meet_the_world_s_largest_iceberg<\/a><br>\n<\/li><\/ul><\/td><\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Icebergs on the Move The large tabular iceberg A23a calved from the Filchner&#x2013;Ronne Ice Shelf in 1986. After its calving, the research base Druzhnaya I, which was placed on this iceberg, had to be removed and was renamed to Druzhnaya III. For many years the iceberg remained stuck on the seabed before it started moving [&#x2026;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":1645,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2223","page","type-page","status-publish","hentry"],"translation":{"provider":"WPGlobus","version":"3.0.0","language":"en","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>Iceberg A23a - 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\/cryosphere\/iceberg-a23a\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Iceberg A23a - 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