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Nachdem wir jetzt einige Wochen mit der Vorbereitung der Drifter und dem Zusammenbauen der Einzelteile verbracht haben, sind nun die ersten Drifter zu Wasser gelassen worden. Ob sie zuverl\u00e4ssig funktionieren, wird sich in den n\u00e4chsten Tagen zeigen. Schon jetzt kann man einige der Drifter online verfolgen. Schaut einfach hier<\/a> auf der Webseite von Beluga vorbei.<\/p>\n\n\n\n Physical oceanography is largely concerned with ocean currents: where they go, how strong they are and whether they change. The previous blog post was about the moorings, which can measure, among other things, flow velocities. This method of installing a measuring device at a fixed point and recording what passes by is called the Euler method. The other approach \u2013 the Lagrange method \u2013 is based on placing a measuring instrument in the water, letting it drift with the current and tracking its trajectory.<\/p>\n\n\n\n The idea of letting an object drift with the current has been around for a long time. Georg Neumayer came up with the idea of giving captains a message in a bottle on their journeys, which should be thrown into the water at certain places. The message was a letter asking the finders to come forward and provide the location and time of the discovery. The first of these bottles was launched on 14 July 1864 from the ship “Norfolk” near Cape Hoorn. It was only three years later that it was found on the south coast of Australia.<\/p>\n\n\n\n An involuntary use of such so-called drifters occurred in 1992 in a container ship accident in the North Pacific. The ship, which was on its way from Hong Kong to the United States, lost several containers in a storm. One of them had loaded bathtub animals made of plastic: squeaky ducks, beavers, turtles and frogs. An estimated 29,000 of these plastic animals suddenly swam in the ocean and were found during walks on numerous beaches in the years to come. Countless finds have been reported in Hawaii and Australia, some even made it to the west coast of the United States, as well as to Scotland and England. They probably drifted north through the Bering Strait into the Arctic Ocean as far as Greenland into the North Atlantic. So the container accident became a stroke of luck for science.<\/p>\n\n\n\n The drifters that are used today can already do a little more than Neumayer’s bottles and the plastic animals. For the latter two, it was not clear which way they had travelled between the starting point and the end point. Modern drifters send their precise measurement data automatically via satellites to data centers, making it possible to observe their paths almost in near real time.<\/p>\n\n\n\n On this trip we also have Drifters with us: built by the Helmholtz Centre Hereon in Geestacht. Scientists from Hereon have been working on a prototype that is supposed to contain less plastic. Now it consists of a big glass containing batteries and electronics and shows the astonishing resemblance to Neumayer’s bottle post idea. For additional buoyancy and to keep the glass upright in the water column, there is a wide wooden ring at the top of the glass. At the end, an aluminum sail is attached to the bottom of the drifter to keep it stable in the water column. In addition to position information, some of the drifters also collect data on air pressure and temperature as well as water temperature.<\/p>\n\n\n\n After we have spent a few weeks preparing the drifters and assembling the parts, the first drifters have now been launched. Whether they function reliably will be revealed in the coming days. You can already track some of the drifters online. Just check out the website of Beluga here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" English version below Die physikalische Ozeanographie besch\u00e4ftigt sich in gro\u00dfen Teilen mit Meeresstr\u00f6mungen: wo sie genau verlaufen, wie stark sie sind und ob sie sich ver\u00e4ndern. Im vorherigen Blogeintrag ging es um die Verankerungen, die unter anderem Str\u00f6mungsgeschwindigkeiten messen k\u00f6nnen. Diese Methode, also ein Messger\u00e4t an einem festen Punkt zu installieren und aufzuzeichnen, was vorbeiflie\u00dft, […]<\/p>\n","protected":false},"author":259,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-81","post","type-post","status-publish","format-standard","hentry","category-auf-see"],"_links":{"self":[{"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/posts\/81","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/users\/259"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/comments?post=81"}],"version-history":[{"count":3,"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/posts\/81\/revisions"}],"predecessor-version":[{"id":103,"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/posts\/81\/revisions\/103"}],"wp:attachment":[{"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/media?parent=81"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/categories?post=81"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm129\/wp-json\/wp\/v2\/tags?post=81"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.oceanblogs.org\/msm129\/wp-content\/uploads\/sites\/102\/2024\/06\/IMG_1001-1.jpeg\")
Drifter in a bottle<\/h1>\n\n\n\n