Data Access Options
Project
Gliders in the Southwestern Gulf of Mexico
Date Range
2011-05-07 to 2011-09-14
Sensors
This file contains data from the following specific instruments: Sea-Bird SBE 41CP CTD.
Summary
Spray glider data from mission 11504001, part of the Gliders in the southwestern gulf of mexico project. This is the complete science-quality dataset for the full mission, spanning from 2011-05-07 to 2011-09-14.
These glider observations were part of a coordinated national and multi-institutional strategy by the Mexican National Institute of Ecology (INE-SEMARNAT) to establish a baseline of oceanographic, geochemical and biological characteristics in the Gulf of Mexico. CICESE is the institution responsible for the deep-sea component of the baseline study. The study included an oceanographic cruise and the use of gliders. The Instrument Development Group at Scripps Institution of Oceanography supported CICESE researchers by providing Spray gliders for the baseline study. The gliders characterized oceanographic conditions continuously for a period of 6 months. This project was funded by Pemex in response to the DeepWater Horizon oil spill in the Gulf of Mexico.
For some years, the Canek group of the department of Physical Oceanography of CICESE (Dr. Antonio Badán, Dr. Julio Candela, Dr. José Ochoa, Dr. Julio Sheinbaum) has done research on circulation in regions near the continental slope of the Gulf, and is considered a scientific leader in the circulation of waters deep in this region. Deep-sea circulation is strongly linked to biogeochemistry of carbon, oxygen and nutrients, platform circulation, transport of pollutants to coastal areas, and therefore the health of the pelagic ecosystem.
This is a delayed-mode science-quality data product providing the highest-resolution and highest quality data for this mission. After a glider mission is complete and the glider is recovered, the full-resolution data are downloaded and quality controlled resulting in this data product. This product is typically available three to six months after a glider mission is complete.
The delayed-mode science quality full-resolution data product should be used in place of near-real-time data once this higher-quality data product is available. This is a rigorously quality controlled dataset, the results of quality control tests are included as flags. Where appropriate, in addition to the original data with quality flags, corrected variables are also provided. These are noted in the variable metadata.Users of the data must apply the quality control flag variables referenced as ancillary variables on the data variables, these flags provide necessary information for using the data.
About these measurements: A Spray glider moves slowly through the water and collects information about the water it is traveling through. It collects a series of vertical profiles from the ocean seafloor (up to 1000m deep) to the ocean surface. In typical operations to 1000 m depth, a Spray glider travels 15 miles and makes 4 profiles per day. When on the ocean surface, about every three to six hours, it sends the information it collected underwater back via satellite, and then dives back down to continue collecting data.
The Spray ocean glider carries a pumped Sea-Bird CTD to measure pressure, temperature, and salinity, a Seapoint fluorometer, and a Sea-Bird dissolved oxygen sensor. Additionally, a Nortek acoustic Doppler current profiler (ADCP) measures depth dependent water velocity. The ocean glider position is measured at the surface at the beginning and end of each dive by GPS, allowing for a dead reckoning estimation of depth averaged water velocity.
An underwater glider runs on batteries and can stay out to sea for months at a time. Spray gliders collect observations on the ascent of a dive. Sensor observations are not collected on the descent and one vertical profile of observations is collected on the ascent of each dive.
Contributors
Jose Ochoa (PrincipalInvestigator), Daniel Rudnick (PrincipalInvestigator), Instrument Development Group (processor), Guilherme Castelao (processor), Jennifer Sevadjian (resourceProvider)