rosette sampler
A rosette sampler (also known as a CTD-rosette or carousel) is a device used for water sampling in deep water. Rosette samplers are used in the ocean and large inland water bodies such as the North American Great Lakes in order to investigate quality. Rosette samplers are a key piece of equipment in oceanography and have been used to collect information over many years in repeat hydrographic surveys. • Illustration — A rosette sampler • Illustration — Side and top views with (grey) Niskin bottles and (blue) CTD-logger
rosette sampler
Pablo Clemente-Colon · NOAA Photo Library: arct0221 · Public domain
- Field
- water sampler · oceanographic instrument
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wikidata · Q3442596 · wikipedia · Rosette sampler
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Water sampling is used in general for chemical analysis and ecotoxicological assessment. A rosette sampler is preferred to Winchester sampler for collection of water samples at depths greater than 50 m.
In this photo: Matt Lowe (left) Nate Webb (on top of the rosette) There are three technicians on board the Bold. Their primary responsbilities are equipment and lab maintenance, and they also assist the scientists that come on the ship when the survey's are underway to ensure the equipment is functioning properly. Photo by Eric Vance, U.S. EPA Learn more @ www.epa.gov/boldkids
USEPA Environmental-Protection-Agency · August 9, 2011 Crew technicians work away on the CTD
Photo by Jeanethe Falvey, U.S. EPA www.epa.gov/boldkids/scienceonboard.html#RosetteWaterSampler
USEPA Environmental-Protection-Agency · August 5, 2011 Preparing the rosette sampler as we spin on station
Description
A rosette sampler is made of an assembly of 12 to 36 sampling bottles. Each bottle is a volume that range from a minimum value of 1.2 L to a maximum value of 30 L. The bottles are clustered around a cylinder situated in the center of the assembly, where there is a sensing system called Sea-Bird or CTD, that stands for "Conductivity, Temperature and Depth", although other variables can be measured by modern CTDs (e.g. water turbidity, dissolved oxygen concentration, chlorophyll concentration and pH). The apparatus is attached to a wire rope. A winch on board of the boat unrolls the rope during descent and rolls up it during the ascent (i.e. at the end of the samples collection). During operations in the ocean, a rosette sampler can approach the seabed at a distance from 1 to 5 m, depending on the particular sea conditions. The opening of each sampling bottle can be automatic (by reaching a certain depth) or manual (by operator, remotely).
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The biographical narrative on this page is based on the Wikipedia article Rosette sampler, revision 1368251339 (EN edition), by its contributors. VALÉORINE has edited that text and built its own documentary record around it. The reused material is available under CC BY-SA 4.0, and this page's reuse of it is offered under the same licence. Everything else on this page — the chronology, the holdings, the evidence, the plates and the connections — is VALÉORINE's own record. Sources and licences.
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These works are cited by the source article, in its own numbering. They are recorded as its citations, not as sources VALÉORINE has verified.
- 1.Woods Hole Oceanographic Institution, "Rosette Sampler"
- 2.Civil & Environmental Engineering Department at Michigan Tech, "CTD and the Rosette samples on Lake Superior"
- 3.Jan Brant, "Collection of water samples"
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