NDLI: Free falling Probe Current and Temperature Measurement System

Content Provider	IEEE Xplore Digital Library
Author	Rossby, T. Wolter, V.
Copyright Year	2008
Description	Author affiliation: Univ. of Rhode Island, Kingston (Rossby, T.)
Abstract	Ocean currents all over the globe contribute significantly to the state of the world climate. Knowledge of how they vary with time can provide a useful information on future states of the climate system. While satellites provide excellent spatial coverage, they measure only surface currents. To determine mass- and heatfluxes and their change over time accurately requires regular and repeat measurement of subsurface currents and thermal structure. An attractive way to do this is from merchant marine vessels that traffic the same route on a regular basis. Experience with ADCPs installed on the CMV Oleander and MS Nuka Arctica demonstrate how effective this approach is. However,ADCPs reach only down into the main thermocline. There is an emerging need to include the deep waters in such ocean observation programs. Here we describe a system to profile both velocity and temperature to great depths from vessels underway. The key element of the system is an acoustic probe, similar to an expendable bathythermograph that is dispensed into the water from a ship and falls at a constant velocity. During its descent it continually measures temperature. The measured data, along with a clock signal, are transmitted to a small baseline array of hydrophones in the hull of the vessel such that the probe-hydrophone travel times are continuously known. This information, together with an accurate vessel attitude or inertial navigation system, allows us to determine the probe descent trajectory and hence the current profile. Such systems, operated on merchant marine vessels in repeat and regular traffic, could provide valuable information about ocean currents and water properties along the ship's route and how these change over time.
Starting Page	56
Ending Page	60
File Size	5220981
Page Count	5
File Format	PDF
ISBN	9781424414857
DOI	10.1109/CCM.2008.4480844
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Probes Temperature measurement Sea measurements Ocean temperature Current measurement Marine vehicles Acoustic measurements Satellites Sea surface Time measurement
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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