GLAD experiment CODE-style drifter trajectories (low-pass filtered, 15 minute interval records), northern Gulf of Mexico near DeSoto Canyon, July-October 2012
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Metadata:
File identifier:
R1.x134.073-0004-metadata.xml
Language:
eng; USA
Character set:
Character set code:
utf8
Hierarchy level:
Scope code:
dataset
Metadata author:
Responsible party:
Individual name:
Ed Ryan
Organisation name:
University of Miami / Rosenstiel School of Marine and Atmospheric Science
Position name:
Senior Research Associate
Contact info:
Contact:
Phone:
Telephone:
Voice:
3054214109
Facsimile:
Address:
Address:
Delivery point:
4600 Rickenbacker Cswy
City:
Miami
Administrative area:
Florida
Postal code:
33149
Country:
USA
Electronic mail address:
eryan@rsmas.miami.edu
Role:
Role code:
principalInvestigator
Date stamp:
2018-08-11T13:37:14+00:00
Metadata standard name:
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
Metadata standard version:
ISO 19115-2:2009(E)
Dataset URI:
https://data.gulfresearchinitiative.org/metadata/R1.x134.073:0004
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Identification info:
Data identification:
Citation:
Citation:
Title:
GLAD experiment CODE-style drifter trajectories (low-pass filtered, 15 minute interval records), northern
Gulf of Mexico near DeSoto Canyon, July-October 2012
Alternate title:
GLAD experiment CODE-style drifter trajectories (low-pass filtered, 15 minute interval records)
Date:
Date:
Date:
2013-08-23
Date type:
Date type code:
publication
Identifier:
Identifier:
Code:
Anchor: xlink: https://dx.doi.org/10.7266/N7VD6WC8 title: DOI
doi:10.7266/N7VD6WC8
Abstract:
297 trajectories from near-surface CODE-type ocean drifters (drogued at a depth of one meter) tracked in
real-time using SPOT GPS units, launched in the northern Gulf of Mexico near DeSoto Canyon in July 2012 as
part of the CARTHE Grand Lagrangian Deployment (GLAD) experiment. Most of these drifters were launched as
triplets (separated by roughly 100 meters at launch) in an attempt to measure multi-scale near surface
dispersion. Positions are low-pass filtered (one hour cutoff period) and interpolated to uniform 15 minute
intervals starting on whole hours over the period July 20 through October 22, 2012. No temperature or
salinity sensors were attached to these drifters. This dataset was created by the Consortium for Advanced
Research on Transport of Hydrocarbon in the Environment (CARTHE). This research was made possible by a grant
from BP/The Gulf of Mexico Research Initiative.
Purpose:
Triads of CODE style drifters (initially separated by roughly 100 meteres) were launched nearly simultaneously
to measure near-surface relative dispersion over scales ranging from 100 meters to 100 km.
Status:
Progress code:
completed
Point of contact:
Responsible party:
Individual name:
Brian Haus
Organisation name:
University of Miami / Rosenstiel School of Marine and Atmospheric Science
Position name:
Professor
Contact info:
Contact:
Phone:
Telephone:
Voice:
3054214932
Facsimile:
Address:
Address:
Delivery point:
4600 Rickenbacker Causeway
City:
Miami
Administrative area:
Florida
Postal code:
33149
Country:
USA
Electronic mail address:
bhaus@rsmas.miami.edu
Role:
Role code:
principalInvestigator
Descriptive keywords:
Keywords:
Keyword:
drifters
Keyword:
dispersion
Keyword:
submesoscale
Keyword:
surface transport
Keyword:
CODE drifter
Keyword:
drifter
Keyword:
transport
Keyword:
oil spill
Keyword:
trajectories
Type:
Keyword type code:
theme
Descriptive keywords:
Keywords:
Keyword:
Gulf of Mexico
Keyword:
De Soto Canyon
Type:
Keyword type code:
place
Resource constraints: title: Cite As
Constraints:
Use limitation:
Özgökmen, Tamay. 2013. GLAD experiment CODE-style drifter trajectories (low-pass filtered, 15 minute
interval records), northern Gulf of Mexico near DeSoto Canyon, July-October 2012. Distributed by: Gulf
of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas
A&M University–Corpus Christi. doi:10.7266/N7VD6WC8
Resource constraints: title: CC0 License
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licenceUnrestricted
Other constraints:
This information is released under the Creative Commons license - No Rights Reserved - CC0 1.0 Universal
(https://creativecommons.org/publicdomain/zero/1.0/). The person who associated a work with this deed
has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide
under copyright law, including all related and neighboring rights, to the extent allowed by law. You can
copy, modify, distribute and perform the work, even for commercial purposes, all without asking
permission.
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Language:
eng; USA
Topic category:
Topic category code:
oceans
Topic category:
Topic category code:
environment
Extent:
Extent:
Geographic element:
Geographic bounding box:
West bound longitude:
-95.0623
East bound longitude:
-82.2385
South bound latitude:
22.0661
North bound latitude:
30.1222
Geographic element:
BoundingPolygon:
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Outer boundary:
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-84.9913 28.9198 -85.0042 29.1768 -85.281 29.274 -85.4083 29.3012 -85.3878 29.3744 -85.3659
29.4413 -85.3802 29.4629 -85.331 29.4704 -85.3061 29.5524 -85.3312 29.578 -85.3415 29.5935
-85.3633 29.6477 -85.4079 29.6585 -85.4185 29.6588 -85.4191 29.884 -85.9419 29.8848 -85.9437
29.8855 -85.9455 29.8862 -85.9473 29.8924 -85.9638 29.893 -85.9657
Temporal element:
Temporal extent:
Extent:
Time period:
Description:
ground condition
Begin date:
2012-07-20
End date:
2012-10-22
Supplemental Information:
Column 1: drifter ID string (like CARTHE_XXX, XXX=3 digit integer) Column 2: date (yyyy-mm-dd) Column 3: time
(HH:MM:SS.SS) Column 4: latitude (decimal degrees) Column 5: longitude (decimal degrees) Column 6: estimated
position error (meters) Column 7: u (east-west) velocity (m/sec) Column 8: v (north-south) velocity (m/sec)
Column 9: estimated velocity error (m/sec) |GLAD CODE drifter positions were reported in real-time roughly
every five minutes via the Globalstar satellite network. Positions reported by the SPOT handheld GPS units
inside each drifter were nominally accurate to within seven meters. Occasionally, position errors much
larger than this nominal value are found. These may be due to errors in GPS baselines (due to poor satellite
reception), data dropout, and, in some cases, drifters that were picked up by small boats. Each drifter
record ends when the drifter was known to be picked up by a boat, when the signal was lost for more than 24
hours, or when the drifter traveled more than 80 km in a 12 hours period (implying a mean speed of 1.85
m/sec over 12 hours). For each record, positions that imply an instantaneous drifter speed greater than 3
m/sec were deleted. Also, positions that imply the drifter track rotated through more than 360 compass
degrees within three hours were deleted. Next, outliers were identified as positions that were more than 100
meters away from estimated positions at the same times interpolated from a set of both past and future
positions. These outliers were deleted. All valid positions were then interpolated to uniform, five-minute
time intervals using spline interpolation. These five-minute records were used to compute finite difference
estimates of u (east-west) and v (north-south) velocities. Finally, the five-minute position and velocity
records were filtered using a Butterworth fourth-order low-pass filter with a one hour period cutoff. These
low-pass filtered records were then interpolated to uniform 15-minute intervals beginning on whole hours.
Crude estimates of position error are also provided for each position in the final 15-minute interval
records. The error was set to 10 meters (a nominal value) for positions recorded at times for which there
were no gaps in the five-minute raw data records over the previous hour. The error was increased according
to the ratio of the average sample time interval for the previous 12 raw data positions to the nominal
sample interval of 5 minutes, multiplied by the 10 meter nominal error value. Velocity errors were computed
by dividing the sum of two consecutive position errors by the corresponding time interval.|CODE II drifter
body with SPOT Satellite GPS Messenger (orange).|Raw drifter positions were low-pass filtered (one hour
cutoff period) and interpolated to uniform 15 minute intervals starting on whole hours.||
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Distribution info:
Distribution:
Distributor:
Distributor:
Distributor contact:
Responsible party:
Organisation name:
Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC)
Contact info:
Contact:
Phone:
Telephone:
Voice:
3618253604
Address:
Address:
Delivery point:
6300 Ocean Drive
City:
Corpus Christi
Administrative area:
TX
Postal code:
78412
Country:
USA
Electronic mail address:
griidc@gomri.org
Online Resource:
Online Resource:
Linkage:
URL:
https://data.gulfresearchinitiative.org
Role:
Role code:
distributor
Distributor format:
Format:
Name:
dat, txt
Version:
inapplicable
File decompression technique:
zip
Distributor transfer options:
Digital transfer options:
Transfer size:
44.0409
Online:
Online Resource:
Linkage:
URL:
https://data.gulfresearchinitiative.org/data/R1.x134.073:0004
Protocol:
https
Name:
Data Landing Page
Description:
GRIIDC dataset landing page
Function:
Online function code:
information
Return To Index
Metadata maintenance:
Maintenance information:
Maintenance and update frequency:
unknown
Maintenance note:
This ISO metadata record was automatically generated from information provided to GRIIDC for dataset:
R1.x134.073:0004 on 2021-03-02T01:22:43-06:00
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<gml:description>ground condition</gml:description>
<gml:beginPosition>2012-07-20</gml:beginPosition>
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<gco:CharacterString>Column 1: drifter ID string (like CARTHE_XXX, XXX=3 digit integer) Column 2: date (yyyy-mm-dd) Column 3: time (HH:MM:SS.SS) Column 4: latitude (decimal degrees) Column 5: longitude (decimal degrees) Column 6: estimated position error (meters) Column 7: u (east-west) velocity (m/sec) Column 8: v (north-south) velocity (m/sec) Column 9: estimated velocity error (m/sec) |GLAD CODE drifter positions were reported in real-time roughly every five minutes via the Globalstar satellite network. Positions reported by the SPOT handheld GPS units inside each drifter were nominally accurate to within seven meters. Occasionally, position errors much larger than this nominal value are found. These may be due to errors in GPS baselines (due to poor satellite reception), data dropout, and, in some cases, drifters that were picked up by small boats. Each drifter record ends when the drifter was known to be picked up by a boat, when the signal was lost for more than 24 hours, or when the drifter traveled more than 80 km in a 12 hours period (implying a mean speed of 1.85 m/sec over 12 hours). For each record, positions that imply an instantaneous drifter speed greater than 3 m/sec were deleted. Also, positions that imply the drifter track rotated through more than 360 compass degrees within three hours were deleted. Next, outliers were identified as positions that were more than 100 meters away from estimated positions at the same times interpolated from a set of both past and future positions. These outliers were deleted. All valid positions were then interpolated to uniform, five-minute time intervals using spline interpolation. These five-minute records were used to compute finite difference estimates of u (east-west) and v (north-south) velocities. Finally, the five-minute position and velocity records were filtered using a Butterworth fourth-order low-pass filter with a one hour period cutoff. These low-pass filtered records were then interpolated to uniform 15-minute intervals beginning on whole hours. Crude estimates of position error are also provided for each position in the final 15-minute interval records. The error was set to 10 meters (a nominal value) for positions recorded at times for which there were no gaps in the five-minute raw data records over the previous hour. The error was increased according to the ratio of the average sample time interval for the previous 12 raw data positions to the nominal sample interval of 5 minutes, multiplied by the 10 meter nominal error value. Velocity errors were computed by dividing the sum of two consecutive position errors by the corresponding time interval.|CODE II drifter body with SPOT Satellite GPS Messenger (orange).|Raw drifter positions were low-pass filtered (one hour cutoff period) and interpolated to uniform 15 minute intervals starting on whole hours.||</gco:CharacterString>
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<gmd:URL>https://data.gulfresearchinitiative.org</gmd:URL>
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<gco:CharacterString>This ISO metadata record was automatically generated from information provided to GRIIDC for dataset: R1.x134.073:0004 on 2021-03-02T01:22:43-06:00</gco:CharacterString>
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