Spurs 2

July 30, 2017

The Lady Amber is to deploy the floats and drifters every few months, starting several months in advance of the main deployment cruise, providing real‐time observations in the poorly‐sampled SPURS‐2 area. Such Lagrangian array will be invaluable for planning of the deployment of the moorings and the bulk of the Lagrangian instrumentation. Drifters and floats deployments from Spring 2016 to Fall 2017 will also extend the SPURS‐2 experiment to cover two complete wet (summer) seasons.

The Lady Amber will be servicing Sea gliders, Wave Gliders, instruments on the surface moorings, and other instruments. Furthermore, having a vessel in the region on a regular basis would  provide safety for many assets.

The SPURS 2 site is located at 25N 125W.

The equipment they added on in Hawaii was:

  1. To obtain high-Quality meteorological variables and air-sea flux estimates.
  2. To collect continuous time series of temperatures and salinity at the surface and at 1m and 2m depths.
  3. To take profiles and time series of the upper ocean on a regular basis.

 

Atmospheric Measurements

Meteorological sensors are mounted on the Lady Amber to measure 3-axis wind speed; down-welling solar and infrared radiation; relative humidity, air temperature and atmospheric pressure. A  compass and GPS unit will measure heading and speed over ground to compute the wind speed relative to earth. These sensors will be combined with measurements of the sea temperature to  compute the momentum, sensible heat, latent heat, and radiative fluxes. These measurements will be used  to estimate the net heat flux.

 

Sea Surface and Near-Surface Measurements

The Lady Amber is equipped with a low-power version of a salinity snake system: a hose floating on the sea surface, hanging from a 10-15’ bowsprit, that samples water right at the surface. Similarly equipped, are sub-surface salinity and temperature measurements at depths of 1 m and 2 m using a pair of SBE-49s FastCat CTDs mounted on the keel of the Lady Amber. The CTDs will  be mounted using custom armored housings to protect them during long deployments. Data from the salinity snake, keel mounted CTDs, and the rain gauges can be logged using the same  computer in order to conserve power. Each dataset will contain continuous measurements at three depths between a few centimeters and 2 m, which can be related to the atmospheric conditions  measured simultaneously with the meteorological package.

 

Upper Ocean Measurements

Provided with a Sontek CastAway CTD (a self-contained temperature-conductivity depth sensor, to be mounted on a fishing pole), which can be used to get regular CTD profiles of the upper 100m. Profiles will be obtained at each drifter deployments.