The physical and biogeochemical processes that control and maintain the hypoxic zone in the northern Gulf of Mexico are complex and their relative strengths are known to vary temporally and spatially at many scales. The MCH Project was funded by NOAA from 2003-2016 and consisted of an integrated observational and numerical modeling approach to better understand the interactions of the physical, biological, and geochemical processes and their variability across the entire Texas/Louisiana shelf. This information contributes to a comprehensive description of the mechanisms that control hypoxia in the northern Gulf of Mexico. Environmental and oceanographic observations were recorded on 31 process-oriented research cruises and resulted in more than 120 towed transects, ~5000 CTD casts, ~30000 water samples, and more than 50000 km of ship flow-through system data. The data represented in this submission account for 15 research cruises and is the second of two submissions to NCEI; access to first submission is Accession 0088164.

CTD data were taken during the 2009 surveys of the Louisiana continental shelf. Hydrographic data were obtained with the LUMCON SeaBird 911+ CTD system and a YSI 6820. Nutrient, pigment, suspended sediment, surface salinity, Secchi depth, and station information data were also acquired.

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The Conductivity, Temperature and Depth (CTD) and Water Depth and Temperature Bathythermograph (XBT) data were collected in Gulf of Mexico as part of Texas Institutions Gulf Ecosystem Research (TIGER) project funded by grant no MMS # 14-35-0001-30501. Data was collected from Ship GYRE cruises 92G09, 92G10 and 92G13. The data was collected over a period spanning from September 26, 1992 to October 31, 1992. Data was submitted in two diskettes by Dr. Douglas C. Biggs, Texas A&M University, College Station, TX. The originator's data containing 32 CTD observations; 52 stations and 12,860 records has been processed. CTD data is available in F022-CTD-Hi Resolution file format of NODC. The originator's bathythermograph (XBT) data has been converted and are now available on line in C116 (XBT) file format of NODC. The F022 format contains high-resolution data collected using CTD (conductivity-temperature-depth) and STD (salinity-temperature-depth) instruments. As they are lowered and raised in the oceans, these electronic devices provide nearly continuous profiles of temperature, salinity, and other parameters. Data values may be subject to averaging or filtering or obtained by interpolation and may be reported at depth intervals as fine as 1m. Cruise and instrument information, position, date, time and sampling interval are reported for each station. Environmental data at the time of the cast (meteorological and sea surface conditions) may also be reported. The data record comprises values of temperature, salinity or conductivity, density (computed sigma-t), and possibly dissolved oxygen or transmissivity at specified depth or pressure levels. Data may be reported at either equally or unequally spaced depth or pressure intervals. A text record is available for comments. The C116/C118 format contains temperature-depth profile data obtained using expendable bathythermograph (XBT) instruments. Cruise information, position, date and time were reported for each observation. The data record was comprised of pairs of temperature-depth values. Unlike the MBT Data File, in which temperature values were recorded at uniform 5 m intervals, the XBT data files contained temperature values at non-uniform depths. These depths were recorded at the minimum number of points ("inflection points") required to accurately define the temperature curve. Standard XBTs can obtain profiles to depths of either 450 or 760 m. With special instruments, measurements can be obtained to 1830 m. Prior to July 1994, XBT data were routinely processed to one of these standard types. XBT data are now processed and loaded directly in to the NODC Ocean Profile Data Base (OPDB). Historic data from these two data types were loaded into the OPDB.

This dataset contains water temperature, salinity, oxygen, and other parameters collected by CTD from research vessel Pelican in the Gulf of Mexico from 2020-09-25 to 2020-10-04. Hydrographic data were collected on a mid-experiment telemetry cruise from an array of moored instrumentation. These data were collected to calibrate the travel time measurements of the moored current- and pressure-recording inverted echo sounders. The data are in NetCDF format.

This dataset contains water temperature, salinity, oxygen, and other parameters collected by CTD from research vessel Pelican in Gulf of Mexico from 2019-06-14 to 2019-10-03. Hydrographic data were collected on the deployment cruise of an array of moored instrumentation and on a mid-experiment telemetry cruise. These data were collected to calibrate the travel time measurements of the moored current- and pressure-recording inverted echo sounders. Some instrument sites were visited more than once on each cruise. The data are in NetCDF format.

R/V Pelican: PE14-20 Hydrographic (CTD) Data, Gulf of Mexico (GC600 and AT357), GC600 and AT357. Five conductivity, temperature and depth (CTD) casts made from R/V Pelican in the northern Gulf of Mexico in lease blocs GC600 and AT357 in conjunction with and support of ongoing mooring and deep sea lander experiments.

The Conductivity, Temperature and Depth (CTD) and bathythermograph (XBT) data were collected in Gulf of Mexico as part of Texas Institutions Gulf Ecosystem Research (TIGER) and LATEX project funded by grant no MMS # 14-35-0001-30501. Data was collected from Ship GYRE. The data was collected over a period spanning from June 2, 1993 and June 24, 1993. Data was submitted by Mark Garner, Texas A&M University, College Station, TX. Data has been processed and is available in F022-CTD-Hi Resolution and C116 Bathythermograph file format of NODC. Objective of LATEX A was to observe currents and waves, water properties (such as temperature, salinity and nutrients), and air-sea interaction over the Texas- Louisiana shelf, with the aim of providing data adequate to describe and better understand the circulation and transport of water, nutrients and other properties over that shelf.

The Conductivity, Temperature and Depth (CTD) and Bathythermograph (XBT) data were collected as part of Texas Institutions Gulf Ecosystem Research (TIGER) program. One week of data was collected from Gulf of Mexico using Ship GYRE. The data was collected over a period spanning from March 2, 1991 to March 9, 1991. Data was collected as part of a study supported by grant MMS # 14-35-0001-30501 to Dr. Douglas C. Biggs and was submitted by Dr. Edward Webb of Texas A&M University, College Station, TX. Data has been processed and is available in F022-CTD-Hi Resolution and C116-Bathythermograph-XBT file format of NODC.

The Conductivity, Temperature and Depth (CTD); and bathythermograph (XBT) data were collected as part of Distribution/Abundance of Marine Mammals in Gulf of Mexico (GULFCET I) funded by grant no MMS 14-35-0001-30619. The data was collected over two year period spanning from April 15, 1992 to December 12, 1993. Data from 239 casts of CTD and 566 XBT drops was submitted via internet by Dr. Giulietta Fargion of Texas A&M University, Galveston, TX.