Dataset: pH

Name: Spectrophotometric pH measured at 25 degrees C using the total hydrogen ion scale from R/V Thomas G. Thompson and R/V Kilo Moana cruises TN277, KM1301, KM1312 in the Eastern North Pacific Ocean from 2012-2013 (POWOW project)
Published: 2014-09-08
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.3753.3

Spatial Extent: N:46.6888 E:-118.316 S:21.3428 W:-160.6166

Temporal Extent: 2012-03-01 - 2013-07-27

Project:

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

Principal Investigator:

Zackary I. Johnson (Duke University)

BCO-DMO Data Manager:

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

Version:

Version Date:

2014-09-08

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Spectrophotometric pH measured at 25 degrees C using the total hydrogen ion scale from R/V Thomas G. Thompson and R/V Kilo Moana cruises TN277, KM1301, KM1312 in the Eastern North Pacific Ocean from 2012-2013 (POWOW project)

Abstract:

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2014-09-08	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.3753.3	2019-03-05

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

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

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.

Data Files

File
pH.csv (Comma Separated Values (.csv), 135.26 KB) MD5:e23bf13fda08bff2304e00bf7de2e0d7 Primary data file for dataset ID 3753

More Information about this dataset

Funding Sources

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

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
TN277	POWOW1	2012-02-29	R/V Thomas G. Thompson	Zackary I. Johnson (Chief Scientist) Erik Zinser (Co-Chief Scientist) Zackary I. Johnson (Contact)	data info
KM1301	POWOW2	2013-01-10	R/V Kilo Moana	Zackary I. Johnson (Chief Scientist) Erik Zinser (Co-Chief Scientist) Zackary I. Johnson (Contact)	data info
KM1312	POWOW3	2013-07-01	R/V Kilo Moana	Zackary I. Johnson (Chief Scientist) Erik Zinser (Co-Chief Scientist) Zackary I. Johnson (Contact)	data info

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

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
day_utc	2-digit day of month, UTC.	dd (01 to 31)	day_utc
lat	Latitude at start of CTD cast. Positive = North.	decimal degrees	lat
lon	Longitude at start of CTD cast. Positive = East.	decimal degrees	lon
time_utc	Time (UTC) at start of sample collection, 24-hour clock.	HHMM.mm	time_utc
depth_w	Depth of the water (bottom depth) at sampling station.	meters	depth_w
depth	Sample depth.	meters	depth
month_utc	2-digit month of year, UTC.	mm (01 to 12)	month_utc
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
year	4-digit year. in YYYY format	unitless	year
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
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

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