{"id":10587,"date":"2014-08-07T15:43:10","date_gmt":"2014-08-07T15:43:10","guid":{"rendered":"http:\/\/cornellsailing.com\/2014\/08\/secchi-in-ice-2\/"},"modified":"2014-08-07T15:43:10","modified_gmt":"2014-08-07T15:43:10","slug":"secchi-in-ice","status":"publish","type":"post","link":"https:\/\/cornellsailing.com\/de\/2014\/08\/secchi-in-ice\/","title":{"rendered":"Secchi in ice"},"content":{"rendered":"<p>The earliest recordings of measuring the clarity of water was by the <br \/> German naturalist Adelbert von Chamisso during a Russian expedition in <br \/> 1815\u20131818. The Secchi disk was invented in 1865 by Pietro Angelo Secchi <br \/> who described the method of lowering a white disk into the water until <br \/> it disappeared from sight. <a href=\"http:\/\/cornellsailing.com\/ocean\/science\/citizen-science-and-phytoplankton-the-secchi-disk-project\/\">A citizen science program using Secchi disks <\/a><br \/> has been set up by Dr Richard Kirby of Plymouth University.<\/p>\n<p>The Secchi disk is a 30cm white round disk. We made ours out of plastic <br \/> <a href=\"http:\/\/cornellsailing.com\/2014\/07\/preparing-for-the-northwest-passage\/\">using the laser cutter in the tech department of my school: Rednock <\/a><br \/><a href=\"http:\/\/cornellsailing.com\/2014\/07\/preparing-for-the-northwest-passage\/\"> School<\/a>. It is attached to a weight and tape measure.<br \/> We drop the Secchi disk into the water and if everything goes <br \/> accordingly, it will go straight down until it has disappeared. This is <br \/> called the Secchi depth and shows the clarity (transparency) of the <br \/> water and can be used to suggest the amount of plankton in the sea <br \/> surrounding the area of the Secchi disk reading.<\/p>\n<p>I\u2019ve done two readings so far, one in Dundas Harbour and one in the <br \/> middle of the ice in Admiralty Inlet.<\/p>\n<div class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-large\" src=\"http:\/\/cornellsailing.com\/wp-content\/uploads\/2014\/08\/m_Secchi-disk-450x600.jpg\" alt=\"\" width=\"450\" height=\"600\" \/><\/p>\n<p class=\"wp-caption-text\">\u00a0<\/p>\n<\/div>\n<p>Dundas Harbour has lots of silt in its waters as many streams and a <br \/> glacier run into it. Well, the glacier has actually receded from the <br \/> water line, but as it is a bay, it is expected to be more opaque. That <br \/> first reading we got 6.9m. We use an app to record the readings and sea <br \/> temperature and any photographs of the area. The second reading was done <br \/> in the ice and also a relatively large channel so the waters were <br \/> constantly moving. That reading was 11m which suggested that water was a <br \/> lot clearer.<\/p>\n<div class=\"morelinks\">\nRead also:<\/p>\n<ul>\n<li><a href=\"http:\/\/cornellsailing.com\/2014\/07\/preparing-for-the-northwest-passage\/\">Preparing for the Northwest Passage<\/a>, by Nera Cornell<\/li>\n<li><a href=\"http:\/\/cornellsailing.com\/ocean\/science\/citizen-science-and-phytoplankton-the-secchi-disk-project\/\">Citizen Science and Phytoplankton: The Secchi Disk Project<\/a><\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The earliest recordings of measuring the clarity of water was by the German naturalist Adelbert von Chamisso during a Russian expedition in 1815\u20131818. The Secchi disk was invented in 1865 by Pietro Angelo Secchi who &#8230;<\/p>\n<p><span class=\"button\"><a href=\"https:\/\/cornellsailing.com\/de\/2014\/08\/secchi-in-ice\/\">Read more<\/a><\/span><\/p>\n","protected":false},"author":5,"featured_media":8827,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ngg_post_thumbnail":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[129],"tags":[153,160],"class_list":["post-10587","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unser-ozean-blog","tag-wissenschaft","tag-plankton-de","odd"],"acf":[],"_links":{"self":[{"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/posts\/10587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/comments?post=10587"}],"version-history":[{"count":0,"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/posts\/10587\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/media\/8827"}],"wp:attachment":[{"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/media?parent=10587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/categories?post=10587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cornellsailing.com\/de\/wp-json\/wp\/v2\/tags?post=10587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}