Instrument: CTD Sea-Bird 911

Dataset: 
Gulf of Maine time series CTD profiles
Instrument: 
CTD Sea-Bird 911
Instrument Short Name: CTD SBE 911
Community Standard Description
(http://vocab.nerc.ac.uk/collection/L22/current/TOOL0035/)
Instrument Description:

The Sea-Bird SBE 911 is a type of CTD instrument package. The SBE 911 includes the SBE 9 Underwater Unit and the SBE 11 Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). More information from Sea-Bird Electronics.

PI supplied instrument name: CTD SBE 911
Dataset-specific description

UNH acquired a new shipboard CTD system in at the end of 2013.  These data were collected in 2012 and 2013.   It remains to be verified if the CTD system used for these data is the new system or the old system.

This is from the Gulf Challenger website:  The system includes a Sea-Bird Electronics (SBE) 25Plus CTD, an SBE-55 Sampling Rosette with six four-liter Niskin bottles, a dedicated Hawboldt Industries SPR 1424/S Science winch, and a SBE-33 real-time monitoring and sampling deck unit. The system provides high resolution vertical profiling of hydrographic properties (e.g. conductivity, salinity, temperature), physiochemical properties (e.g. pH and Photosynthetically Active Radiation (PAR)), and surrogates for biological and geological processes (e.g. dissolved oxygen, chlorophyll-a fluorescence and beam transmittance) that are an essential component of oceanographic field research. 

The winch is outfitted with 400 meters of armored coax conducting wire that will allow profiling to the bottom anywhere within the Gulf of Maine (a maximum of 330 m depth). The unit will allow researchers to observe the CTD profile data in real time, and trip water sample bottles at optimal depths on the up-cast.  An altimeter allows the system to be lowered safely to within 0.5 meter of the bottom without danger of hitting bottom and provides data to the researcher on a real-time computer monitor, as well as to the winch operator through a remote depth/altitude readout at the winch station.