Rockland Scientific to present at the University of Porto Seminar on Ocean Turbulence

Rockland’s Dr. Rolf Lueck will be delivering the seminar Ocean Turbulence: Synergy between scientific advancement and technological innovation alongside Dr. Jorge M. Magalhães from FCUP (University of Porto). The seminar, organized by the Underwater Systems and Technology Laboratory (LSTS-FEUP), will take place on June 2nd, 2017, at the University of Porto (FEUP).

Robotic Ocean Turbulence Measurements at the Observatório Oceânico da Madeira

When scientists go on holiday: Rockland’s Dr. Rolf Lueck recently presented “Robotic Ocean Turbulence Measurements” as the guest speaker at the Observatório Oceânico da Madeira. The presentation focused on the measurement of micro-turbulence, the autonomous vehicles used with the instruments and their respective technological advances.

Boaty McBoatface’s RSI MicroRider

“Boaty’s second big adventure in the Orkney Passage (from Eleanor Frajka-Williams)

Here is the promised post about Boaty’s second mission in the Orkney Passage, which took place during 12-14 April. This post was written by Eleanor Frajka-Williams of Southampton University, with some editing by Stephen Griffies of NOAA/GFDL and Princeton University. It should appeal especially to those interested in details of Boaty’s engineering feats and some of what it does while beneath the ocean surface.”

Read the full article here.

Boaty’s Rockland Scientific MicroRider is also nicely visible in this video from the British Antarctic Survey:

Limiting the Size and Duration of Data Files: autoexec.bat

When preparing for a long duration deployment it is important to consider the length of the data file that will be generated. MicroRiders are often deployed for days or weeks at a time. The default setting on RSI instruments is to collect a single data file unlimited in size. A file collected over days or weeks can be unmanageable in post processing. Furthermore, a file can be lost if the instrument is turned off incorrectly while recording. To limit the size and duration of resulting data files use the flag -t followed by the number of records you would like in each file (1 record is approximately 1 second) . Please note that you will loose 30 to 40 seconds of data every time a file is written; users often use 3600 records (approximately 1 hour). To change your system to automatically use the command odas5ir -f setup.cfg -l 3000 -t 3600 you will need to change the autoexec.bat file:

1. Download the file to your data acquisition computer,
2. Edit the contents of the file to be odas5ir -f setup.cfg -l 3000 -t 3600, or the number of records you prefer,
3. Delete the existing autoexec.bat off the CF card,
4. Upload the new autoexec.bat file to the CF card.

Please note the flag -l 3000 sets the clock on the instrument. For instruments with the Tidal Energy Configuration, which use a sample rate of 1024Hz, the clock must be set to -l 6000.

Warning: Commands on the autoexec.bat file are case sensitive.

To learn more about PicoDOS commands, please review the ODAS5-IR User Guide available in our downloads section.

Canada’s first three-glider mission maps whale habitat

Ocean Tracking Network:

For the first time in Canada, a triple glider project has successfully mapped out critical gray whale habitat off the west coast of Vancouver Island. While previous missions have deployed one or two gliders, this Whales, Habitat, and Listening (WHaLe) project—funded by the Marine Environmental Observation, Prediction, and Response (MEOPAR)—is the first to fly three coordinated gliders.

In addition to the common suite of water property sensors—temperature, salinity and oxygen—the gliders on this mission carried a broadband hydrophone to identify and count whale vocalizations, an echo sounder to remotely quantify zooplankton biomass variability, and optical instrumentation identifying phytoplankton to elucidate the major components of the whale food chain. The University of British Columbia glider also carried a specialized Rockland Scientific sensor suite for measuring ocean turbulence, to better understand why submarine canyons create such favourable habitat for the whales.

Continue Reading…

The 1st Summer School of Upper Ocean Turbulence, Gdańsk 2016

The purpose of the ‘Summer School of Upper Ocean Turbulence’ was to teach students (graduate students and scientists) in the art of turbulence theory, processes and measurements with the focus on the upper ocean.

The 2 week course included a 2 week intensive training period (25 July – 5 August) with lectures by a diverse set of international experts that intend to cover a broad spectrum of problems ranging from application of spectral methods in turbulence data analysis to numerical methods in turbulence research. The last week of the program (8-12 August) included at sea data collection and hands-on experience in data analysis with VMP250 turbulence microstructure profiler. Read More>>

OMG 2017: Ocean Microstructure Glider Training

Ocean Microstructure Glider training, “OMG 2017”, is a 4-day training workshop that covers all aspects of turbulence measurements using MicroRider integration with ocean glider platforms. The training workshop will cover setup, operation, maintenance, deployment and processing of turbulence data. The workshop is scheduled for April 24-27, 2017 in Victoria, B.C. Canada. Please see the OMG 2017 Preliminary Schedule for details. The event promises to bring together a diverse group of scientists from around the world. Seats are limited, to register please fill out the OMG 2017 Registration Form.

 

How to Make a Hotel File

MicroRider mounted on an ocean glider

In order to process data from a velocity shear probe the speed of the instrument or flow over the probes must be obtained. When using a Vertical Microstructure Profiler (VMP) the pressure data can be used to determine speed. However, pressure data cannot be used to obtain speed when profiling horizontally with a MicroRider. In most cases, speed must be determined by using an secondary source such as an acoustic doppler velocimeter, an electromagnetic flow sensor or speed records from an AUV or glider.

If your RSI instrument is mounted on a vehicle that provides mission files, you may wish to integrate the data provided in the mission file into your data processing. In some cases the data recorded by the vehicle is required to process the p-file. There are currently four scripts and functions in the ODAS MATLAB Library for extracting information out of mission files and placing it into a hotel file.

The hotel file is ingested by odas_p2mat and interpolated on to the time vector t_slow in your p-file. The resulting data vectors are saved to the same mat-file as the data vectors produced from the p-files. The most common use of a hotel file is to import speed data from a vehicle when the RSI instrument is not able to measure the speed itself (such as an AUV equipped with a MicroRider, or a Seaglider equipped with MicroPods). An accurate speed estimate is required to convert shear probe data into physical units and to compute gradients of temperature and conductivity. Other data of interest measured by the controller in a vehicle include CT data, pressure, pitch, roll and heading, for example.

If you would like to processes your data without a hotel file, please indicate a reasonable constant speed in meters per second. For example: odas_p2mat(‘file_name.P’,’constant_speed’,1.2)

For more information and an example of Hotel File setup, please review Section 10 of Technical Note 39. Please login or register on our website to download this technical note.

Please join us 2017 April 24-27

If you are interested in learning more about Hotel Files, please join us for our annual Ocean Microstructure Glider training (OMG 2017), scheduled for 2017 April 24-27 .

Scientists Explain How Meltwater Reaches Ocean Depths

January 30th, 2017 Press Release 
An international team of researchers has discovered why fresh water, melted from Antarctic ice sheets, is often detected below the surface of the ocean, rather than rising to the top above denser seawater. The team found that the Earth’s rotation influences the way meltwater behaves – keeping it at depths of several hundred metres.

The research is published this week in the journal Nature in association with colleagues at University of Southampton, National Oceanography Centre, Southampton, University of East Anglia (UEA), British Antarctic Survey (BAS) and Stockholm University. Read the Full Article

Live LAMTOV demo at Ocean Business 2017

Rockland Scientific and OceansScan-MST are pleased to announce our free live demo of the LAMTOV (Light Autonomous Microstructure Turbulence Vehicle) at Ocean Business 2017. The LAMTOV is an integration of Rockland’s neutrally buoyant MicroRider 1000 and OceanScan-MST’s LAUV. Please join us to experience this exciting collaboration.

The dockside demonstration will begin at 10:30 on Wednesday, April 5th with a follow-up classroom session at 12:00 on Thursday, April 6th.

To register for the free demo please follow the link here.

Rockland Scientific’s neutrally Buoyant MicroRider 1000

 

 

 

 

 

 

Video of the Light Autonomous Underwater Vehicle from OceanScan-MST