CalCOFI CTD HISTORY
Summary: CalCOFI officially replaced the 20-bottle hydrowire cast with a Seabird 911 CTD-rosette in August 1993. Starting in Dec 1989, it took three years of testing, development, training, and comparisons to data collected by hydrowire bottle casts to switch over. At that time, CalCOFI performed 20-bottle hydrocasts on 66 stations and daily 6-bottle productivity casts. Since the 20 bottle hydrocast was mission critical and the Seabird CTD was new and untested, the first scientific deployments of the CTD-rosette replaced the primary productivity casts. Requiring only 6 bottles closed, a smaller rosette and pylon were used for these shallow casts.
When finally adopted for all station work on CalCOFI 9308NM, the CTD and sensors were mounted on a 24-bottle rosette frame. The separate hydrographic and primary productivity casts were combined into one 24-bottle CTD-rosette cast.
Other noteworthy events: the Seabird 911 system was upgraded to 911plus in 1998. At the same time, the General Oceanics 24-place pylons were replaced with a Seabird SBE32 carousels.
Originally deployed with one set of temperature & conductivity sensors, a second pair, with their own pump, was added July 1998.
LTER joined CalCOFI cruises in Nov 2004, adding an ISUS nitrate sensor to the CTD and additional seawater analyses.
When finally adopted for all station work on CalCOFI 9308NM, the CTD and sensors were mounted on a 24-bottle rosette frame. The separate hydrographic and primary productivity casts were combined into one 24-bottle CTD-rosette cast.
Other noteworthy events: the Seabird 911 system was upgraded to 911plus in 1998. At the same time, the General Oceanics 24-place pylons were replaced with a Seabird SBE32 carousels.
Originally deployed with one set of temperature & conductivity sensors, a second pair, with their own pump, was added July 1998.
LTER joined CalCOFI cruises in Nov 2004, adding an ISUS nitrate sensor to the CTD and additional seawater analyses.
Chronology & Changes
CalCOFI CTD HISTORY | ||||
YYYYMM | CruiseSC | Date | Author | Description |
201008 | 1008NH | JRW | 3500m deep CTD casts performed on stas 90.90 & 80.90 | |
201004 | 1004MF | JRW | 12 Niskin bottles only; 2 CTD casts performed on prodo stations to target prodo depths; not enough wire for deep casts | |
201001 | 1001NH | 17-Jan-2010, 29-Jan-2013 | JRW | 3500m deep CTD casts changed to stas 90.90 & 80.90 |
200911 | 0911NH | 6-Nov-2009 | J.Wilkinson | New SBE9plus CTD (09P53161-0936; 6800m) deployed; new sensor pairs T,C,& Ox + Seabird pH sensor, transmissometer, altimeter. New Seapoint fluorometer NOT deployed. |
200911 | 0911NH | 10-Nov-2009, 20-Nov-2009 | JRW | 3500m deep CTD casts performed on stas 90.100 & 80.100; Note for 3500m casts the following sensors are removed: ISUS & battery, PAR & pH. |
200907 | 0907MH | 14-Jul-2009 | J.Wilkinson | New version 2 Deck Unit purchased (27-Mar-2009); offsets secondary conductivity automatically; plus complete new set of sensors: SBE14 Remote depth readout; SBE18 pH sensor; QSP-2300 PAR; Wetlabs C-Star transmissometer; Teledyne Altimeter (on older 'fish') |
200411 | 0411RR | 2-Nov-2004 | J.Wilkinson | Satlantic ISUS nitrate sensor with battery pack added to CTD-rosette sensor array. |
199808 | 31-Aug-1998 | J.Wilkinson | CTD SN 93235-0203 (Arnold) upgraded to 9plus; 2058 rated | |
199807 | 9807NH | 08-Jul-1998 | J.Wilkinson | Added a second pair of temperature & conductivity; prompted by failure on previous cruise of the primary conductivity sensor - returned from calibration cracked. |
199807 | 01-Jul-1998 | J.Wilkinson | SBE32 Carousel Water Sampler replaces General Oceanics Pylon (Model 1015 purchased 8/1989) | |
199805 | 26-May-1998 | J.Wilkinson | CTD Sn 91338-1 (Homer) upgrade to 9plus; 3400m rating | |
199308 | 9308NH | 11-Aug-1993 | J.Wilkinson | Seabird CTD officially used for all 66 stations; 66 casts; 20 bottles |
199210 | 9210NH | 26-Sep1992 | J.Wilkinson | Seabird CTD used for prodo casts; 13 casts; 12 bottles; Ed Renger Prodo Cast operator |
199207 | 9207NH | 02-Jul-1992 | J.Wilkinson | Seabird CTD tested during prodo casts; 14 casts; 10 bottles |
199204 | 9204JD | 26-Apr-1992 | J.Wilkinson | One cast; conductive wire winch failure; hanging prodo cast on hydrowire |
199202 | 9202JD | 29-Jan-1992 | J.Wilkinson | Seabird CTD tested during prodo casts; 14 casts; 10 bottles |
199110 | 9110NH | 28-Sep-1991 | J.Wilkinson | New and improved Seabird CTD tested; 13 casts; 12 bottles. |
199011 | 9011NH | 8-Nov-1990 | J.Wilkinson | Second test of Seabird CTD on CalCOFI; 12 casts; 9 bottles. |
199003 | 9003JD | 4 Mar 1990 | J.Wilkinson | Seabird CTD first tested on CalCOFI; 13 casts; 10 bottles |