©2020 Biological and Chemical Oceanography Data Management Office.Funded by the U.S. National Science Foundation
©2020 Biological and Chemical Oceanography Data Management Office.VPR images and log files from R/V Roger Revelle cruise RR2004 in the Pacific Sector of the Southern Ocean along 150W from Jan-Feb of 2020 and R/V Thomas G. Thompson cruise TN376 in the South Indian Ocean from Jan-Feb of 2021.
Location:
R/V Thomas G. Thompson cruise TN376: South Indian Ocean
R/V Roger Revelle cruise RR2004: Pacific Sector of the Southern Ocean along 150W|
Methods & Sampling:
To assess the large microplankton and small mesoplankton community alongside fine-scale measurements of temperature, salinity, and fluorescence, a Video Plankton Recorder II (VPR, from SeaScan Inc.) was towed behind the ship across the shelf break. The VPR consists of a towed body, containing a Seabird Electronics Inc. CTD (SBE 49 FastCat), oxygen sensor (SBE 43), fluorometer (ECO FLNTU-4050), ECO Triplet (ECO BBFL2-123), PAR (photosynthetically active radiation; Biospherical Instruments Inc. QCP-200L), and a synchronized video camera and xenon strobe (Davis et al., 2005). The VPR was towed at 10 knots (5.1 m s-1), undulating between depths as shallow as 5m and as deep as 120m approximately every 6 minutes. This provided a minimum horizontal resolution of 1.8 km throughout the tow.
Description of package contents within the "Data Files" and "Supplemetnal Files" sections:
VPR data presented in two types: images (tif format, *.tif) and log files for the hydrographic, bio-optical and navigation data (text format, *.combo). The images come in at 30 frames per second and the log files are 1 second averages. So there is not 1-to-1 mapping.
Each VPR tow (vpr1, vpr2, vpr3, etc.) has subdirectories called d### (year day #), then h## (hour), then the roi tifs collected during that hour and the ctd.dat file of corresponding physical data.
Example relative storage path within a tif image file zip:
RR2004/vpr/rois/vpr1/d362/h23/roi3.8594409700.tif
<cruise_id>/vpr/rois/d<year day #>/h<hour>/roiN.timestamp.tif
ROI naming convention is roiN.timestamp.tif where timestamp is milliseconds since midnight.
Tif file name example: roi0.4565601000.tif
N is the thread number in the processing stream, taking on values 0 through 3. This is a remnant from a prior incarnation of the software, not relevant to science use. Please ignore.
File name format: mmddhhminss.combo where mmddhhminss is VPR tow start date/time.
(2023) VPR images and log files from cruise RR2004 in the Pacific Sector of the Southern Ocean and cruise TN376 in the South Indian Ocean (Jan 2020 to Feb 2021). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2023-07-11 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/904204 [access date]
Terms of Use
This dataset is licensed under Creative Commons Attribution 4.0.
If you wish to use this dataset, it is highly recommended that you contact the original principal investigators (PI). Should the relevant PI be unavailable, please contact BCO-DMO (info@bco-dmo.org) for additional guidance. For general guidance please see the BCO-DMO Terms of Use document.