Dataset: pH
Deployment: TN277

Spectrophotometric pH measured at 25 degrees C using the total hydrogen ion scale

Principal Investigator:

Zackary I. Johnson (Duke University)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Seasonal and decadal changes in temperature drive Prochlorococcus ecotype distribution patterns (POWOW)

Current State:

Final no updates expected

Version:

22 Oct 2012

Deployment Synonyms:

POWOW1

Version Date:

2012-10-22

Data URL:

https://www.bco-dmo.org/dataset-deployment/455488/data

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Description

Spectrophotometric pH measured at 25 degrees C using the total hydrogen ion scale (pHT,25C). Data are reported from the POWOW1 (TN277), POWOW2 (KM1301), and POWOW3 (KM1312) cruises.

Methods & Sampling

Dataset acquisition description

pH was measured spectrophotometrically (Clayton and Byrne, 1993) in triplicate at standard temperature (25 degrees C) immediately following collection. pH samples were collected following recommended procedures (Dickson et al., 2007).

Data Processing Description

Dataset Processing Description

BCO-DMO edits made:
- Parameter names have been changed to conform to BCO-DMO conventions.
- month_utc, day_utc, year, and time_utc were added, based on the original ISO_DateTime_UTC field.
- Rosette bottle numbers were added from the CTD cast sheets (for POWOW1 data).
- 'NaN' replaced by 'nd' to indicate 'no data'.
- Corrected dates of POWOW2 CTD07 samples.

NOTE: During POWOW1 cast CTD01, all bottles were fired at 25m depth. The bottle numbers displayed in the data for CTD01 are those bottles from which pH was measured.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1031064	NSF Division of Ocean Sciences

Instruments

Spectrophotometer

Supplied Description:

Instrument Type

Generic Name: Spectrophotometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_name	Cruise identifier (POWOW1 = TN277 = R/V Thomas G. Thompson cruise 277; POWOW2 = KM1301 = R/V Kilo Moana cruise 1301).	text	cruise_name
cast	Consecutive CTD cast number. CTD numbers are unique and sequential across stations.	unitless	cast
lat	Latitude at start of CTD cast. Positive = North.	decimal degrees	lat
lon	Longitude at start of CTD cast. Positive = East.	decimal degrees	lon
depth_w	Depth of the water (bottom depth) at sampling station.	meters	depth_w
month_utc	2-digit month of year, UTC.	mm (01 to 12)	month_utc
day_utc	2-digit day of month, UTC.	dd (01 to 31)	day_utc
year	4-digit year. in YYYY format	unitless	year
time_utc	Time (UTC) at start of sample collection, 24-hour clock.	HHMM.mm	time_utc
ISO_DateTime_UTC	Date/Time (UTC) ISO8601 formatted. T indicates start of time string; Z indicates UTC.	YYYY-mm-ddTHH:MM:SS.ssZ	ISO_DateTime_UTC
depth	Sample depth.	meters	depth
bot	Rosette position of the bottle.	unitless	bot
pH	Spectrophotometric pH measured at 25 degrees Celsius using the total hydrogen ion scale.	unitless; pH scale	pH

Database

Contribute Data

Dataset: pH
Deployment: TN277

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: pHDeployment: TN277

Dataset acquisition description

Dataset Processing Description

Dataset: pH
Deployment: TN277