DOI: 10.6075/j0fq9ws6
title: Scripps Argo trajectory-based velocity product 2001-01 to 2020-12. In Scripps Argo Trajectory-Based Velocity Product

description: This dataset contains absolute velocity estimates from quality controlled Argo trajectory files. Both Scripps trajectory products include trajectories from Core, BGC and Deep Argo floats starting in 2001. Only trajectories with cycles ranging from 5 - 25 days are included in the products. The products include both a transmitted and extrapolated trajectory-based velocity (if available) for each cycle. The extrapolated velocities are only available for floats equipped with the Argos positioning system which have six or more good quality surface fixes. PRODUCTS: There are two product netCDF files within the archive: - Quality controlled Argo trajectory-based velocities within the 800 - 1200 db range - Quality controlled Argo trajectory-based velocities within the 100 - 6200 db range FORMAT: All products are netCDF files and fill value is ‘99999’ for numbers and ‘ ‘ for characters. The products both have the following variables: Locations and times: LATITUDE_ASCENDING_TRANSMITTED – transmitted latitude at surfacing LATITUDE_DESCENDING_TRANSMITTED – transmitted latitude at descending LONGITUDE_ASCENDING_TRANSMITTED – transmitted longitude at surfacing LONGITUDE_DESCENDING_TRANSMITTED – transmitted longitude at descending JULD_ASCENDING_TRANSMITTED – transmitted time at surfacing JULD_DESCENDING_TRANSMITTED – transmitted time at descending LATITUDE_ASCENDING – if available, extrapolated latitude at surfacing. If not available, the transmitted latitude at surfacing LATITUDE_DESCENDING – if available, extrapolated latitude at descending. If not available, the transmitted latitude at descending LONGITUDE_ASCENDING– if available, extrapolated longitude at surfacing. If not available, the transmitted longitude at ascending. LONGITUDE_DESCENDING – if available, extrapolated longitude at descending. If not available, the transmitted longitude at descending JULD_ASCENDING – if available, extrapolated time at surfacing. If not available, the transmitted time at ascending. JULD_DESCENDING – if available, extrapolated time at descending. If not available, transmitted time at descending Velocities: VELOCITY_ZONAL_TRANSMITTED - zonal transmitted velocity VELOCITY_MERIDIONAL_TRANSMITTED - meridional transmitted velocity VELOCITY_ZONAL - if available, extrapolated zonal velocity. If not available, the transmitted zonal velocity. VELOCITY_MERIDIONAL - if available, extrapolated meridional velocity. If not available, the transmitted zonal velocity. Associated data: DRIFT_PRES - best estimate of drift pressure DRIFT_TEMP - best estimate of drift temperature CYCLE_NUMBER - cycle number of profile used to make subsurface velocity estimates (e.g., '2' means subsurface velocity during cycle 2-3). SURFACE_FIXES - number of surface fixes on descending cycle WMO_NUMBER - WMO number of Argo float POSITIONING_SYSTEM - ‘ARGOS’, ’GPS’, or ’IRIDIUM’. This comes from the ‘POSITIONING_SYSTEM’ variable in the Argo trajectory files. Currently, there are some floats that have ‘IRIDIUM’ in this variable, but it is inaccurate. These floats use ‘GPS’ for their positioning. POSITIONING_SYSTEM_FLAG - 1 means Argos, 2 means GPS or Iridium PLATFORM_TYPE - comes from ‘PLATFORM_TYPE’ variable in Argo files and corresponds to Argo Reference Table 23: PLATFORM_TYPE SENSOR_TYPE_FLAG - 1 means float with CTD only, 2 means oxygen sensor in addition to CTD, 3 means additional BGC sensors, 4 means acoustic sensor or EM sensor, 5 means sea surface temperature MISSION_FLAG - Argo float mission: 1 means core, 2 means bgc, 3 means deep EXTRAP_FLAG - flag to indicate if there is an extrapolated velocity (EXTRAP_FLAG = 1) or just transmitted (EXTRAP_FLAG = 0)