MBARI CTD Data Dictionary

MBARI Shipboard CTD samples from the Biological Ocean Group(BOG)

This document briefly describes the fields in the BOG database for CTD samples. The data in these tables are primary productivity, physical, and chemical ocean data. There are two tables: BCTD bottle data and PCTD profiling data. The bottle samples are taken at 11 discrete depths, usually 0, 5, 10, 20, 30, 40, 60, 80, 100, 150, and 200m. Profiling data are averaged into 1 meter depth bins. For additional details see Methods and Materials. Data are processed using Seabird software. Data in these data tables are primarily from Monterey Bay, CA cruises. Also see BOG Projects.

BCTD Table

CTD bottle data (up cast), productivity, physical, and chemical data. One record for each CTD rosette bottle

Owner: Francisco Chavez (P.I.), Tim Pennington (Project Manager), Reiko Michisaki

Keys: project, platform, expd, seq, depth, bottle

Note: * Sparsely populated field. **Unpopulated field

Field	Field Name	Type	Description
1	ctd_bottle_id	Integer	Database record number
2	Cruise	Text	Cruise name, i.e S197, SU93-1, 00798
3	Expd	Integer	Expedition ID, JJJYY i.e. 15896 JJJ=Day of Year, YY= year
4	Seq	Integer	Station number
5	Depth	Integer	Nominal depth at which sample was taken
6	Bottle	Integer	Bottle number
7	Project	Text	Project Code, i.e. PTLO, SECRET, AOSNII etc.
8	ctrb_id	Text	MBARI Station Name
9	Platform	Text	Platform off of which the data were was collected
10	Rjday	Integer	Running day of year from 01/011988
11	date_time	Date	CTD cast begins sample collection GMT
12	Jtime	Float	Time stamp GMT
13	year_date	Integer	YYYYJJJ Year and Day of Year
14	dec_lat	Float	Decimal Latitude
15	dec_long	Float	Decimal Longitude
16	site_id	Text	Site Name
17	Pressure	Float	Pressure at which sample was taken (db)
18	chl gff	Float	Chlorophyll filtered with GFF (mg m-3)
19	Phaeo gff	Float	Phaeopigment filtered with GFF (mg m-3)
20	fofa gff	Float	Ratio of FO to FA, GFF
21	vf gff	Float	Volume filtered with GFF ml
22	ve gff	Float	Volume extracted ml
23	sens gff	Float	Fluorometer sensitivity
24	fo gff	Float	Before acid added
25	fa gff	Float	After acid
26	fluor_rto	Float	fluor ratio
27	chl_1u	Float	Chlorophyll filtered with 1µ filter (mg m-3)
28	Phaeo_1u	Float	Phaeopigment filtered with 1µ (mg m-3)
29	fofa_1u	Float	Ratio of FO to FA, 1µ filter
30	vf_1u	Float	Volume filtered with 1µ filter ml
31	ve_1u	Float	Volume extracted ml
32	fo_1u	Float	Before acid added
33	fa_1u	Float	After acid
34	sens_1u	Float	Fluorometer sensitivity
35	chl_5u	Float	Chlorophyll filtered with 5µ filter (mg/m3)
36	Phaeo_5u	Float	Phaeopigment filtered with 5µ (mg/m3)
37	fofa_5u	Float	Ratio of FO to FA, 5µ filter
38	vf_5u	Float	Volume filtered with 5µ filter ml
39	ve_5u	Float	Volume extracted ml
40	sens_5u	Float	Fluorometer sensitivity
41	fo_5u	Float	Before acid added
42	fa_5u	Float	After acid
43	Tmp	Float	Temperature (°C) ITS-90
44	Sal	Float	Salinity (psu)
45	Conduct	Float	Conductivity (siemens/m)
46	Sig_T	Float	Sigma T (kg/m3)
47	Parcos	Float	PAR cosine (µE/m2/s)
48	par4pi	Float	PAR (µE/m2/s)
49	Transmiss	Float	Transmissivity (volts)
50	Chla	Float	Chla (mg/m3)
51	Fluor	Float	Fluorescence (mg/m3)
52	nh4*	Float	Ammonium (µM)
53	no2	Float	Nitrite (µM)
54	no3	Float	Nitrate (µM)
55	sio4	Float	Silicate (µM)
56	po4	Float	Phosphate (µM)
57	tco2**	Float	Total CO2
58	o2**	Float	Oxygen (water sample)
59	oxy_ml	Float	Oxygen Saturation (sensor) ml
60	oxy_ps	Float	Oxygen Percent Saturation (sensor)
61	irrd_490**	Float	Satlantic irradiance channel 490 nm
62	irrd_520**	Float	Satlantic irradiance channel 520 nm
63	irrd_555**	Float	Satlantic irradiance channel 555 nm
64	Altimeter**	Float	Sonic Depth (m)

PCTD Table

Samples from the Profiling CTD (down cast), productivity and physical parameters (sensor data). One record for each meter in depth.

Owner: Francisco Chavez (P.I.), Tim Pennington (Project Manager), Reiko Michisaki

Keys: project, platform, expd, seq, depth

Note: * Sparsely populated field. **Unpopulated field

Field	Field Name	Type	Description
1	Pctd_id	Integer	Database record ID
2	Cruise	Text	Cruise name, i.e. S197, SU93-1, 00798
3	Expd	Integer	Expedition ID, JJJYY i.e. 15896 JJJ=Day of Year, YY= year
4	Seq	Integer	Station number
5	Depth	Integer	Target depth at which sample was taken (m)
6	Project	Text	Project Code, i.e. MUSE, PP, SU
7	ctrb_id	Text	MBARI Station Name
8	Platform	Text	Platform off of which the data were collected
9	Rjday	Integer	Running day of year from 01/01/1988
10	date_time	Date	CTD cast begins sample collection (GMT)
11	Jtime	Float	Time stamp (GMT)
12	year_date	Integer	YYYYJJJ Year and Day of Year
13	dec_lat	Float	Decimal Latitude
14	dec_long	Float	Decimal Longitude
15	site_id	Text	Site Name
16	ctd_id**	Text	CTD ID Number
17	Pressure	Float	Pressure at which sample was taken (db)
18	Tmp	Float	Temperature (°C) ITS-90
19	Sal	Float	Salinity (psu)
20	Conduct	Float	Conductivity (siemens/s)
21	Pot_temp	Float	Potential temperature (°C) ITS-90
22	Sigma_theta	Float	Sigma Theta (kg/m3)
23	Parcos	Float	PAR cosine sensor (µE/m2/s)
24	par4pi	Float	PAR 4pi sensor (µE/m2/s)
25	Chla	Float	Calculated Chla (mg/m3)
26	Fluor	Float	Fluorescence (volts)
27	trans_volts	Float	Transmissivity (volts)
28	trans_pct	Float	Transmissivity (%)
29	trans_beam**	Float	Transmissivity (?)
30	oxy_ml	Float	Oxygen (ml)
31	oxy_ps	Float	Oxygen (%)
32	OxyC**	Float	Oxygen current
33	OxyT**	Float	Oxygen temperature
34	Altimeter**	Float	Sonic Depth (m)
35	IR443**	Float	wavelength 443nm
36	IR490**	Float	wavelength 490 nm
37	IR555**	Float	wavelength 555 nm

Monterey Bay Aquarium Research Institute (MBARI)
7700 Sandholdt Road
Moss Landing, CA 95039
831-775-1739
http://www.mbari.org/bog