Dataset: Baja Safe Spaces 2018: ADCP

Name: ADCP data from Nearshore Isla Natividad, Baja California Mexico from July to August of 2018
Published: 2022-03-24
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.872339.1

Spatial Extent: N:27.8869 E:-115.1887 S:27.8869 W:-115.1887

Temporal Extent: 2018-07 - 2018-08

Project:

Collaborative Research: Evaluating how abalone populations in the California Current are structured by the interplay of large-scale oceanographic forcing and nearshore variability (Abalone Safe Places)

Principal Investigator:

Stephen G. Monismith (Stanford University)

Co-Principal Investigator:

Clifton Brock Woodson (University of Georgia, UGA)

Scientist:

Derek Fong (Stanford University)

Student:

Margaret Daly (Stanford University)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2022-03-24

Restricted:

Validated:

Yes

Current State:

Final no updates expected

ADCP data from Nearshore Isla Natividad, Baja California Mexico from July to August of 2018

Abstract:

ADCP data collected as part of a Nearshore study conducted Isla Natividad, Baja California Mexico from July to August of 2018 that included currents, water level, wave data, temperature, and dissolved oxygen.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2022-03-24	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.872339.1	2023-05-22

Methods & Sampling

Location: Isla Natividad, Baja California, Mexico (27º53.215 N, 115º11.325 W depth 15-30m)

From July - Aug of 2018, numerous instruments were deployed around Isla Natividad in Baja California Mexico. . These included ADCPs, which were bottom-mounted by lead weights.

Folders and filenames included in this dataset contain transect and target depth identifiers.
Prefix letters represent a cross-shore transect line and the 2 numerals represent the approximate target depth of a mooring along that line. There were 4 transects (LG,PP, MP, BB) and moorings were targeted at 15, 20, and 25m on each transect. For example "BB15" indicates transect BB and target mooring depth of 15m. See the supplemental file "deploy_info.csv" for a list of transect-mooring deployments included in this dataset.

Data Processing Description

MATlab 2019 b is used for all QA/QC and processing. The following steps are taken for QA/QC

- NaN if vel error > 5* the standard deviation of velocity in ADCP plan
- NaN if vel correlation < 100
- NaN if percent_good (which is outputted from RDI ADCPs) < 90
- NaN if Echo Intensity < 30
- NaN if fish is observed (the difference between two bins is >30)
- NaN 15% below sea level for side lobe
- NaN if pitch or roll > 15
- Cleaned data was then filtered to 10 minutes using a low pass filter

BCO-DMO Data Manager Processing Notes:

* .mat file context examined and example structures provided in data file descriptions.

* .mat and .txt vector and array exports provided by the submitter were bundled into .zip files and attached to dataset.
* .netcdf files containing the same ADCP data as the .mat files were added as a separate .zip file. These were added as the primary data for this dataset.

* deploy_info.csv was created by extracted the contents of every *_Info*.txt file within the provided file hierarchy. The Deployment ID was extracted from the filename of the _Info file.
* ISO_DateTime_UTC_Start was added as a column by converting start time in Mountain Time

Data Files

File

ADCP netcdf files
filename: ADCP_netcdf.zip

(ZIP Archive (ZIP), 19.82 MB)
MD5:ab498194da10d811bac06ef5f7cd51de

10 ADCP files in netCDF format.

Filelist:
ADCP_BB15.nc
ADCP_BB20.nc
ADCP_LG15.nc
ADCP_LG20.nc
ADCP_LG25.nc
ADCP_MP20.nc
ADCP_MP25.nc
ADCP_PP15.nc
ADCP_PP20.nc
ADCP_PP25.nc

Example netCDF header (from file ADCP_BB15.nc):

netcdf ADCP_BB15 {
dimensions:
        z = 30 ;
        time = 2719 ;
variables:
        double u(time, z) ;
                u:units = "m/s" ;
                u:comment = "East/West velocities" ;
        double v(time, z) ;
                v:units = "m/s" ;
                v:comment = "North/South velocities" ;
        double w(time, z) ;
                w:units = "m/s" ;
                w:comment = "vertical velocities, from beam 5" ;
        double P(time) ;
                P:units = "dbar" ;
        double dnum(time) ;
        double unixtime(time) ;
        double z(z) ;
                z:units = "m" ;
                z:comment = "vertical positive up, above bottom" ;

// global attributes:
                :time_coverage_start = "26-Jul-2018 12:00:00" ;
                :time_coverage_end = "14-Aug-2018 09:00:00" ;
                :time_zone = "MT" ;
                :longitude = "-115.186" ;
                :latitude = "27.863" ;
                :name = "BB15" ;
}

Supplemental Files

File

ADCP .mat files
filename: ADCP_mat_and_txt.zip

(ZIP Archive (ZIP), 42.04 MB)
MD5:c2f31aed3fa53590c8a72f59e65a514b

ADCP data. Contains matlab .mat files and txt files containing exported vectors and arrays from the .mat file.

This file bundle contains subfolders named by deployment ID (transectID+target_depth).  Each folder contains a file ending with _Info.txt which contains deployment information such as start and end time, lat,lon, depth, units.

Within each folder is the .mat file for the deployment containing a structure "DATA"

% example DATA struct
% DATA = 
% 
%   struct with fields:
% 
%         East: [30×2719 double]
%        North: [30×2719 double]
%         Vert: [30×2719 double]
%         Time: [7.3727e+05 7.3727e+05 7.3727e+05 7.3727e+05 7.3727e+05 7.3727e+05 7.3727e+05 7.3727e+05 7.3727e+05 7.3727e+05 … ]
%     pressure: [14.8000 14.7660 14.7140 14.7010 14.6850 14.6770 14.6160 14.6470 14.5660 14.5670 14.5920 14.5690 14.5730 … ]
%      bin_MAB: [0.9000 1.4000 1.9000 2.4000 2.9000 3.4000 3.9000 4.4000 4.9000 5.4000 5.9000 6.4000 6.9000 7.4000 7.9000 … ]
%     SiteInfo: [1×1 struct]
% 
% DATA.SiteInfo
% 
% ans = 
% 
%   struct with fields:
% 
%     programming: [1×1 struct]
%      start_date: 7.3727e+05
%        end_date: 7.3729e+05
%       Time_Zome: 'MT'
%        latitude: 27.8630
%       longitude: -115.1860
%           notes: {'Not really near kelp, Sandy bed'}
%            name: 'BB15'

% DATA.SiteInfo.programming
% 
% ans = 
% 
%   struct with fields:
% 
%     vert_vel_prec: 0.0070
%      hor_vel_prec: 0.0220

Velocity units are meters per second (m/s). Pressure units are decibars(dbar).

Time is a matlab datenum type in time zone Mountain Time (MT).

Deployment Information
filename: deploy_info.csv

(Comma Separated Values (.csv), 5.04 KB)
MD5:85b804862d2c8f74418595fe27222216

Deployment Information for transects and moorings.

Columns (parameter) info:
Data_Type, Data type collected (e.g. MiniDOT,CTD)
Deployment_ID, Deployment identifier. Prefix letters represent a cross-shore transect line and the 2 numerals represent the approximate target depth of a mooring along that line. 
Transect_ID, There were 4 transects (LG,PP, MP, BB). 
Target_Depth,  Moorings targed deployment depth along transect. Targeted at 15, 20, and 25m on each transect.
Start_Date,Start Date local time zone (MT) in format "%d-%b-%Y %H:%M:%S"
End_Date, End Date local time zone (MT)  in format "%d-%b-%Y %H:%M:%S"
Time_Zone, Timezone (MT, mountain time) used for Start_Date and End_Date
ISO_DateTime_UTC_Start, Start Date time zone UTC in ISO 8601 format "%Y-%m-%dT%H:%M:%SZ"	
Latitude, latitude in decimal degrees
Longitude, longitude in decimal degrees
Units,units used for the data type
Depth, notes "Bottom(seafloor) or no value"