Full View Normal View

data

Radar measurements collected during the LAgrangian Submesoscale ExpeRiment (LASER) experiment aboard R/V Walton Smith cruise WS16015 in the Gulf of Mexico from 2016-01-20 to 2016-02-12

Consortium for Advanced Research on Transport of Hydrocarbon in the Environment II (CARTHE II)

DOI:
10.7266/N7N01550
 
UDI:
R4.x265.000:0065
Last Update:
Sep 17 2018 15:38 UTC
 
Dataset Author(s):
Bjoern Lund, Brian Haus
Point of Contact:
Haus, Brian
University of Miami / Rosenstiel School of Marine and Atmospheric Science
4600 Rickenbacker Causeway
Miami, Florida  33149
USA
bhaus@rsmas.miami.edu
Funding Source:
RFP-IV
Data Collection Period:
2016-01-20 to 2016-02-12

Identified Submitted Review Available
3 3 3 3

Suggested Citation:

Bjoern Lund, Brian Haus (2018) Radar measurements collected during the LAgrangian Submesoscale ExpeRiment (LASER) experiment aboard R/V Walton Smith cruise WS16015 in the Gulf of Mexico from 2016-01-20 to 2016-02-12. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University-Corpus Christi. doi:10.7266/N7N01550

Abstract:

This dataset reports near-surface currents and sea surface roughness derived from X-band radar aboard R/V Walton Smith cruise WS16015 in the Gulf of Mexico from 2016-01-20 to 2016-02-12. This data was collected during the CARTHE II sponsored LAgrangian Submesoscale ExpeRiment (LASER) experiment in the northern Gulf of Mexico. It was obtained from a coherent-on-receive marine X-band (9.5 GHz) radar (Braun et al., 2008), developed at Helmholtz Zentrum Geesthacht (HZG), Germany. The data includes backscatter images collected every 2-min that can be used to identify surface features such as fronts. The data also includes current velocity maps obtained by processing series of these images using 3-D Fast Fourier Transforms (FFTs) and overlays of the current maps over averaged backscatter images. This dataset supports the publication: Lund, B., Haus, B.K., Horstmann, J., Graber, H.C., Carrasco, R., Laxague, N.J., Novelli, G., Guigand, C.M. and Özgökmen, T.M., 2018. Near-surface current mapping by shipboard marine X-band radar: A validation. Journal of Atmospheric and Oceanic Technology, 35(5), pp.1077-1090. doi:10.1175/jtech-d-17-0154.1

Purpose:

This data had three purposes: 1) to identify oceanic frontal features from backscatter images within a 3-km radius of the RV Walton Smith 2) to measure ocean wave spectra from wave patterns observed in the backscatter images 3) to map oceanic near surface currents using temporal stacks of consecutive images.

Theme Keywords:

Radar Remote Sensing, Submesoscale Fronts, Near-surface currents, sea surface roughness, drifters, X-band radar, backscatter

File Format:

NetCDF, jpg, xlsx

Filename:

LASER_XBand.zip (1.88 GB)

Dataset Downloads:

2

Radar measurements collected during the LAgrangian Submesoscale ExpeRiment (LASER) experiment aboard R/V Walton Smith cruise WS16015 in the Gulf of Mexico from 2016-01-20 to 2016-02-12



Identification Information
Distribution Information
Metadata Maintenance Information

Metadata: 
  File identifier: 
      R4.x265.000-0065-metadata.xml
  Language: 
      eng; USA
  Character set: 
    Character set code: 
      utf8
  Hierarchy level: 
    Scope code: 
      dataset
  Metadata author: 
    Responsible party: 
      Individual name: 
          Helga S. Huntley
      Organisation name: 
          University of Delaware / School of Marine Science and Policy
      Position name: 
          Research Assistant Professor
      Contact info: 
        Contact: 
          Phone: 
            Telephone: 
              Voice: 
                  3028311175
              Facsimile: 
          Address: 
            Address: 
              Delivery point: 
                  College of Earth, Ocean, and Environment
                  306 Robinson Hall
              City: 
                  Newark
              Administrative area: 
                  Delaware
              Postal code: 
                  19716
              Country: 
                  USA
              Electronic mail address: 
                  helgah@udel.edu
      Role: 
        Role code: 
          pointOfContact
  Date stamp: 
      2018-09-27T21:05:10+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/R4.x265.000:0065
Return To Index

Identification info: Data identification: Citation: Citation: Title: Radar measurements collected during the LAgrangian Submesoscale ExpeRiment (LASER) experiment aboard R/V Walton Smith cruise WS16015 in the Gulf of Mexico from 2016-01-20 to 2016-02-12 Alternate title: LASER-RADAR-DATA Date: Date: Date: 2018-07-03 Date type: Date type code: publication Abstract: This dataset reports near-surface currents and sea surface roughness derived from X-band radar aboard R/V Walton Smith cruise WS16015 in the Gulf of Mexico from 2016-01-20 to 2016-02-12. This data was collected during the CARTHE II sponsored LAgrangian Submesoscale ExpeRiment (LASER) experiment in the northern Gulf of Mexico. It was obtained from a coherent-on-receive marine X-band (9.5 GHz) radar (Braun et al., 2008), developed at Helmholtz Zentrum Geesthacht (HZG), Germany. The data includes backscatter images collected every 2-min that can be used to identify surface features such as fronts. The data also includes current velocity maps obtained by processing series of these images using 3-D Fast Fourier Transforms (FFTs) and overlays of the current maps over averaged backscatter images. This dataset supports the publication: Lund, B., Haus, B.K., Horstmann, J., Graber, H.C., Carrasco, R., Laxague, N.J., Novelli, G., Guigand, C.M. and Özgökmen, T.M., 2018. Near-surface current mapping by shipboard marine X-band radar: A validation. Journal of Atmospheric and Oceanic Technology, 35(5), pp.1077-1090. doi:10.1175/jtech-d-17-0154.1 Purpose: This data had three purposes: 1) to identify oceanic frontal features from backscatter images within a 3-km radius of the RV Walton Smith 2) to measure ocean wave spectra from wave patterns observed in the backscatter images 3) to map oceanic near surface currents using temporal stacks of consecutive images. 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: pointOfContact Descriptive keywords: Keywords: Keyword: Radar Remote Sensing Keyword: Submesoscale Fronts Keyword: Near-surface currents Keyword: sea surface roughness Keyword: drifters Keyword: X-band radar Keyword: backscatter Type: Keyword type code: theme Descriptive keywords: Keywords: Keyword: Gulf of Mexico Type: Keyword type code: place Language: eng; USA Topic category: Topic category code: oceans Topic category: Topic category code: imageryBaseMapsEarthCover Extent: Extent: Geographic element: Geographic bounding box: West bound longitude: -88.80774 East bound longitude: -87.413626 South bound latitude: 27.920374 North bound latitude: 29.212884 Geographic element: BoundingPolygon: Polygon: gml:MultiSurface: gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.25987 -87.418302 28.261909 -87.44197 28.29195 -87.441128 28.291168 -87.413626 28.25987 -87.418302 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.096072 -87.502464 29.101479 -87.498436 29.124257 -87.493812 29.120947 -87.46178 29.0702 -87.473628 29.071649 -87.508106 29.091281 -87.509672 29.096072 -87.502464 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.320075 -87.468593 28.322103 -87.491968 28.351848 -87.49113 28.351071 -87.463936 28.320075 -87.468593 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.379072 -87.518185 28.381105 -87.541667 28.410549 -87.540832 28.40977 -87.513546 28.379072 -87.518185 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.127906 -87.542471 29.129335 -87.573475 29.149293 -87.57418 29.150144 -87.539185 29.127906 -87.542471 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.046318 -87.547731 29.047721 -87.577185 29.0665 -87.577869 29.067335 -87.544536 29.046318 -87.547731 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.437769 -87.567275 28.439807 -87.590864 28.46885 -87.590034 28.46807 -87.562659 28.437769 -87.567275 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.068825 -87.737037 29.104952 -87.73854 29.107923 -87.714275 29.10205 -87.698953 29.072471 -87.697911 29.06522 -87.693136 29.063818 -87.687407 29.067427 -87.626682 29.049521 -87.611685 29.023653 -87.611685 28.999088 -87.650446 28.992439 -87.654223 28.98762 -87.653637 28.921553 -87.628304 28.897355 -87.631058 28.902108 -87.655647 28.979833 -87.67861 28.984116 -87.681175 28.98685 -87.686474 28.993448 -87.724125 29.036777 -87.71684 29.043164 -87.721436 29.047038 -87.73539 29.068825 -87.737037 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.493757 -87.619563 28.495818 -87.643761 28.524353 -87.642937 28.523566 -87.614976 28.493757 -87.619563 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.154804 -87.618386 29.156237 -87.649671 29.176691 -87.650384 29.177546 -87.615064 29.154804 -87.618386 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.551769 -87.670099 28.553809 -87.693769 28.58375 -87.692929 28.582968 -87.66543 28.551769 -87.670099 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.182505 -87.695877 29.183936 -87.726974 29.204092 -87.727682 29.204945 -87.692576 29.182505 -87.695877 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.612468 -87.7207 28.614511 -87.744469 28.644451 -87.743629 28.643668 -87.71603 28.612468 -87.7207 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.129258 -87.763653 29.132085 -87.799864 29.161456 -87.799031 29.159814 -87.739945 29.132847 -87.739597 29.129258 -87.763653 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.980719 -87.763991 28.982119 -87.793196 28.999702 -87.793857 29.000532 -87.76089 28.980719 -87.763991 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.67257 -87.771505 28.674609 -87.79517 28.70475 -87.794327 28.703968 -87.766823 28.67257 -87.771505 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 29.187454 -87.773902 29.189635 -87.791925 29.212884 -87.790422 29.211512 -87.769392 29.187454 -87.773902 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.384011 -87.774348 28.385928 -87.794701 28.40553 -87.794004 28.404807 -87.77045 28.384011 -87.774348 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.733175 -87.820993 28.735203 -87.844368 28.764948 -87.84353 28.764171 -87.816336 28.733175 -87.820993 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.962215 -87.835192 28.963622 -87.864796 28.9812 -87.865457 28.982034 -87.832089 28.962215 -87.835192 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.425328 -87.851856 28.42715 -87.882371 28.452771 -87.882371 28.452771 -87.847811 28.425328 -87.851856 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.790983 -87.869176 28.792993 -87.892065 28.822145 -87.891233 28.821374 -87.864555 28.790983 -87.869176 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.941916 -87.908222 28.943323 -87.937888 28.961799 -87.938566 28.962635 -87.905049 28.941916 -87.908222 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.848177 -87.915676 28.850199 -87.938865 28.879347 -87.938033 28.878572 -87.911055 28.848177 -87.915676 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.473228 -87.927686 28.475052 -87.958371 28.501771 -87.958371 28.501771 -87.923573 28.473228 -87.927686 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.905349 -87.96924 28.907562 -87.987874 28.934591 -87.986269 28.933189 -87.964433 28.905349 -87.96924 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.816451 -88.600088 28.820819 -88.592802 28.828266 -88.591276 28.83338 -88.593939 28.84812 -88.611339 28.866439 -88.611339 28.870521 -88.576814 28.858697 -88.571359 28.854811 -88.567281 28.853891 -88.556071 28.857332 -88.550305 28.863644 -88.548015 28.93733 -88.5476 28.93733 -88.525412 28.913477 -88.523566 28.908101 -88.526353 28.868683 -88.533084 28.861258 -88.531414 28.84954 -88.517201 28.847556 -88.512777 28.85329 -88.483209 28.859237 -88.476956 28.866959 -88.477206 28.872198 -88.482883 28.875872 -88.505806 28.900368 -88.506357 28.899759 -88.465993 28.901286 -88.461436 28.904763 -88.458118 28.913196 -88.457421 28.936672 -88.468749 28.983146 -88.461727 28.983832 -88.440591 28.960704 -88.43663 28.956973 -88.433564 28.955015 -88.428138 28.955926 -88.423397 28.959758 -88.419084 28.97779 -88.413863 28.978642 -88.396711 28.956467 -88.391943 28.951433 -88.412019 28.948878 -88.415959 28.942947 -88.418655 28.927878 -88.418514 28.922813 -88.415855 28.920035 -88.410854 28.919169 -88.382263 28.885648 -88.380835 28.864135 -88.415692 28.856121 -88.418218 28.84901 -88.413741 28.836503 -88.35258 28.8257 -88.34754 28.821822 -88.341885 28.823616 -88.295993 28.79666 -88.291361 28.792628 -88.288541 28.79043 -88.284139 28.792425 -88.27572 28.811017 -88.260062 28.811333 -88.22885 28.792532 -88.220539 28.788372 -88.214145 28.800052 -88.154455 28.788982 -88.108413 28.773884 -88.110301 28.774699 -88.180113 28.773523 -88.184937 28.767442 -88.189846 28.753643 -88.189924 28.74824 -88.18748 28.74517 -88.182407 28.750323 -88.089073 28.752668 -88.084795 28.756757 -88.082136 28.781149 -88.078674 28.781974 -88.048187 28.767216 -88.043106 28.762396 -88.038457 28.759091 -88.002939 28.744751 -88.001935 28.739316 -88.028358 28.760006 -88.042013 28.7624 -88.048412 28.760125 -88.054854 28.754246 -88.058333 28.730653 -88.060417 28.719595 -88.095304 28.713177 -88.100979 28.707361 -88.1009 28.702573 -88.097596 28.694366 -88.078022 28.672343 -88.082188 28.673474 -88.119985 28.686442 -88.134882 28.713939 -88.137754 28.718508 -88.13942 28.722858 -88.146789 28.720582 -88.154102 28.716654 -88.156969 28.684054 -88.170172 28.67906 -88.170826 28.672874 -88.1676 28.652442 -88.139781 28.633785 -88.139781 28.629914 -88.215014 28.62798 -88.220428 28.624279 -88.223503 28.61957 -88.224494 28.561484 -88.216775 28.558196 -88.238423 28.588441 -88.246931 28.591519 -88.250796 28.596263 -88.264808 28.666376 -88.28044 28.67262 -88.284806 28.674135 -88.291339 28.671181 -88.29736 28.650361 -88.306534 28.650361 -88.336481 28.698658 -88.336093 28.704556 -88.342454 28.705 -88.360565 28.702787 -88.366839 28.698062 -88.370084 28.666867 -88.371143 28.668003 -88.394041 28.762023 -88.383102 28.76678 -88.384211 28.770444 -88.38744 28.771792 -88.395927 28.766948 -88.401901 28.725844 -88.410621 28.723742 -88.430917 28.736511 -88.450563 28.768823 -88.449689 28.773556 -88.451282 28.776929 -88.454967 28.778032 -88.460829 28.769072 -88.537116 28.800425 -88.542569 28.804989 -88.546048 28.806797 -88.550496 28.796003 -88.626055 28.813744 -88.626698 28.816451 -88.600088 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.524224 -88.006295 28.526057 -88.037371 28.553071 -88.037371 28.553071 -88.002163 28.524224 -88.006295 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.595548 -88.119527 28.629791 -88.10227 28.628679 -88.07194 28.550729 -88.081929 28.550729 -88.123858 28.595548 -88.119527 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.376136 -88.210911 28.377248 -88.239181 28.388445 -88.240709 28.394022 -88.200164 28.397829 -88.194438 28.405429 -88.192643 28.466192 -88.203024 28.467583 -88.177324 28.399167 -88.168471 28.393147 -88.199674 28.389887 -88.203363 28.376136 -88.210911 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.496665 -88.197516 28.498694 -88.220732 28.522548 -88.219968 28.521779 -88.193253 28.496665 -88.197516 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.138496 -88.513128 28.169687 -88.508403 28.180139 -88.393318 28.182883 -88.388136 28.189041 -88.385242 28.195625 -88.386959 28.199271 -88.391551 28.222311 -88.47322 28.266798 -88.483302 28.270447 -88.487966 28.275604 -88.506919 28.306123 -88.503294 28.304799 -88.474481 28.265089 -88.472385 28.260118 -88.469426 28.257618 -88.464211 28.260176 -88.409256 28.266336 -88.403148 28.283131 -88.400699 28.286367 -88.385221 28.285371 -88.353471 28.261112 -88.334392 28.25829 -88.329536 28.264663 -88.278456 28.250615 -88.272735 28.24678 -88.266064 28.248819 -88.258645 28.265744 -88.243833 28.261835 -88.216069 28.240934 -88.217715 28.224119 -88.263974 28.218367 -88.26774 28.202714 -88.269812 28.199755 -88.299388 28.195051 -88.304504 28.181037 -88.308591 28.180094 -88.328055 28.17604 -88.334717 28.169428 -88.33657 28.087529 -88.330231 28.073912 -88.359069 28.085606 -88.406191 28.085004 -88.412737 28.067231 -88.436761 28.036594 -88.442832 28.037415 -88.463939 28.076011 -88.466831 28.076083 -88.450294 28.0794 -88.444601 28.101368 -88.438389 28.108531 -88.440176 28.136062 -88.47474 28.137095 -88.483295 28.132869 -88.488612 28.126221 -88.490002 28.086261 -88.476148 28.086885 -88.501488 28.104366 -88.507407 28.107296 -88.511271 28.109403 -88.520334 28.138496 -88.513128 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.452527 -88.247121 28.453547 -88.274264 28.465906 -88.275348 28.467491 -88.244807 28.452527 -88.247121 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.379765 -88.284605 28.381065 -88.298971 28.393571 -88.298971 28.393571 -88.281781 28.379765 -88.284605 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.539717 -88.300686 28.54186 -88.327263 28.570966 -88.326433 28.570151 -88.296058 28.539717 -88.300686 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.458477 -88.371318 28.459865 -88.408299 28.473789 -88.410224 28.482351 -88.365271 28.487353 -88.361141 28.506681 -88.355838 28.506037 -88.338496 28.479441 -88.33512 28.474806 -88.333278 28.471258 -88.328493 28.466169 -88.307436 28.454293 -88.310086 28.458477 -88.371318 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.396465 -88.371839 28.398517 -88.395877 28.429952 -88.39502 28.429165 -88.367083 28.396465 -88.371839 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.006726 -88.690469 28.01681 -88.699028 28.040964 -88.69305 27.974903 -88.50749 27.975809 -88.501677 27.979826 -88.497379 27.998986 -88.4926 27.999678 -88.472487 27.969208 -88.466938 27.964817 -88.46496 27.961509 -88.460251 27.948452 -88.420922 27.930514 -88.420259 27.920374 -88.496643 27.963601 -88.621274 27.967554 -88.678034 28.006726 -88.690469 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.33445 -88.425216 28.33653 -88.449971 28.366956 -88.449126 28.366161 -88.420515 28.33445 -88.425216 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.472519 -88.4494 28.473915 -88.478221 28.489005 -88.478829 28.489826 -88.446513 28.472519 -88.4494 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.485726 -88.520229 28.487109 -88.548412 28.503008 -88.549039 28.503823 -88.517273 28.485726 -88.520229 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.207724 -88.536705 28.210211 -88.560717 28.241861 -88.55901 28.2403 -88.53158 28.207724 -88.536705 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.138968 -88.581012 28.141369 -88.603224 28.173539 -88.601506 28.172023 -88.57586 28.138968 -88.581012 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.498233 -88.587798 28.499601 -88.61512 28.514712 -88.61573 28.515517 -88.584915 28.498233 -88.587798 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.073038 -88.627688 28.075494 -88.651013 28.106653 -88.649316 28.10511 -88.622595 28.073038 -88.627688 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.871532 -88.648248 28.872908 -88.676279 28.892307 -88.676975 28.893127 -88.645012 28.871532 -88.648248 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.822481 -88.696793 28.823961 -88.730971 28.84448 -88.731685 28.84536 -88.693458 28.822481 -88.696793 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.895746 -88.710824 28.897092 -88.737285 28.915815 -88.737968 28.916617 -88.707643 28.895746 -88.710824 gml:surfaceMember: Polygon: Outer boundary: Linear ring: gml:posList: 28.918516 -88.795771 28.919969 -88.80774 28.93286 -88.807183 28.932308 -88.792666 28.918516 -88.795771 Temporal element: Temporal extent: Extent: Time period: Description: ground condition Begin date: 2016-01-20 End date: 2016-02-12 Supplemental Information: Backscatter strength (Db, grey scale 16 bit images); ux (zonal component (west-east direction) of near-surface current, m/s); uy (meridional component (south-north direction) of near-surface current, m/s); xCoords (x coordinates (west-east direction), m); yCoords (y coordinates (south-north direction), m); time (year day; 0.5 corresponds to 01/01/2017, 12:00 UTC, days); imageOriginPosition(geographic coordinates of map origin, i.e., (0 m, 0 m) on (x, y) grid, degrees east, degrees north); startTime (start time in year days; 0.5 corresponds to 01/01/2017, 12:00 UTC, days); endTime (end time in year days; 0.5 corresponds to 01/01/2017, 12:00 UTC, days), nSpec (number of spectra). Dataset contains netCDF files for near-surface currents, kmz files for backscatter and a quick view map (jpg files) of the backscatter and derived near-surface currents.|The backscatter images and near-surface current maps archived here were collected with a HZG MR that was installed on RV F. G. Walton Smith during the Lagrangian Submesoscale Experiment (LASER) near the Mississippi River mouth in early 2016. The study area is affected by the mesoscale eddy field associated with the Gulf of Mexico (GoM) loop current, the Mississippi River discharge, and wind stress. It is characterized by strong horizontal density gradients that are responsible for especially active submesoscale currents.|A DopplerMR developed at the Helmholtz Zentrum Geesthacht (HZG), Germany, was mounted at ~12.5 m above sea level on a mast on top of the wheel-house of RV F. G. Walton Smith. The HZG MR is based on a commercial marine X-band (9.4 GHz) radar with a 7.5-foot HH-polarized antenna, 12 kW peak power output, and an antenna rotation period of 2 s. It was modified to operate as a coherent-on-receive system, measuring both phase and intensity of the radar backscatter (Braun et al. 2008).|The MR has a pulse repetition frequency of 2 kHz when operated with a 50 ns pulse length (short pulse mode), which corresponds to a range resolution of 7.5 m. The horizontal antenna beam width is 0.8°. The radar video signal (in the form of in-phase and quadrature components) is linearly amplified and sampled at 20 MHz, yielding a range pixel spacing that matches the radar’s range resolution. Each pulse is sampled up to a maximum range of ~3.1 km and with an image depth of 13 bit.|The MR–drifter current comparison presented reported in Lund et al. 2018 (JTECH) is of an unprecedented size and scope. A total of 4130 data pairs (from 240 MR analysis periods corresponding to ~5.8 days of measurements) are available, covering winds from 2-12 m/s. The comparison statistics indicate a measurement accuracy that is significantly better than any previously reported results, with RMS errors of 3.5 cm/s for u and 4.0 cm/s for v.|Braun, N., Ziemer, F., Bezuglov, A., Cysewski, M. and Schymura, G., 2008. Sea-surface current features observed by Doppler radar. IEEE Transactions on Geoscience and Remote Sensing, 46(4), pp.1125-1133.
          
Lund, B., Collins, C.O., Tamura, H. and Graber, H.C., 2016. Multi-directional wave spectra from marine X-band radar. Ocean Dynamics, 66(8), pp.973-988.
          
Lund, B., Graber, H.C., Hessner, K. and Williams, N.J., 2015. On shipboard marine X-band radar near-surface current ‘‘calibration’’. Journal of Atmospheric and Oceanic Technology, 32(10), pp.1928-1944.
          
Lund, B., Graber, H.C., Tamura, H., Collins III, C.O. and Varlamov, S.M., 2015. A new technique for the retrieval of near‐surface vertical current shear from marine X‐band radar images. Journal of Geophysical Research: Oceans, 120(12), pp.8466-8486.
Return To Index

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: NetCDF, jpg, xlsx Version: inapplicable File decompression technique: zip Distributor transfer options: Digital transfer options: Transfer size: 1880.2116 Online: Online Resource: Linkage: URL: https://data.gulfresearchinitiative.org/data/R4.x265.000:0065 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: R4.x265.000:0065 on 2019-06-17T00:43:41+00:00
Return To Index