Dataset: pH
Deployment: PICO_1-301

pH measured at the PICO time-series station from 2010 to 2012.

Principal Investigator:

Zackary I. Johnson (Duke University)

Co-Principal Investigator:

Dana Hunt (Duke University)

Contact:

Zackary I. Johnson (Duke University)

BCO-DMO Data Manager:

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

Project:

Pivers Island Coastal Observatory (PICO)

Current State:

Final with updates expected

Version:

28 Aug 2013

Deployment Synonyms:

PICO

Version Date:

2013-08-28

Data URL:

https://www.bco-dmo.org/dataset-deployment/456094/data

Expand/Collapse All

Description

Spectrophotometric pH, measured at 25 degrees C using the total hydrogen ion scale, from the Pivers Island Coastal Observatory (PICO) from 2010 to 2012.

Note: pH was not measured at all time points, thus, some dates have no data ('nd') in the 'pH' column.

Methods & Sampling

Dataset acquisition description

Water was sampled using a 5 L niskin bottle centered at 1 m with a bottle length of 0.7 m. 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).

References:
Clayton, T.D., and Byrne, R.H. 1993. Spectrophotometric seawater pH measurements: total hydrogen ion concentration scale calibration of m-cresol purple and at-sea results. Deep Sea Research Part I: Oceanographic Research Papers 40: 2115-2129. doi: 10.1016/0967-0637(93)90048-8

Dickson, A.G., Sabine, C.L., and Christian, J.R. (eds). 2007. Guide to best practices for ocean CO2 measurements: PICES Special Publication 3.

Data Processing Description

Dataset Processing Description

Quality Scores (qflag) as follows:
1 = excellent (no known issues),
2 = suspect,
3 = poor (known reason to suspect data).

BCO-DMO Processing Notes:
- Created 'replicate' column and re-arranged data so that replicates are in rows, not columns.
- Modified parameter names to conform with BCO-DMO naming conventions.
- Replaced blanks with 'nd' to indicate 'no data'.
- Separated date into month, day, and year columns.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1031064	NSF Division of Ocean Sciences
OCE-RIG-1322950	NSF Ocean Sciences Research Initiation Grants

Instruments

Niskin bottle

Supplied Description:

Water was sampled using a 5 Liter niskin bottle.

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Spectrophotometer

Supplied Description:

Either a Cary 4000 or a Beckman DU 640 spectrophotomer was used.

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
deployment	Deployment name/id number.	text	deployno
lat	Latitude of sampling location. Positive = North.	decimal degrees	lat
lon	Longitude of sampling location. Positive = East.	decimal degrees	lon
year	Year (local time) of the sampling event.	YYYY	year
month_local	Month (local time) when the sampling event occurred.	mm (01 to 12)	month_local
PID_num	Unique, sequential "occupation" number for sampling. (The unique time/day when sampling occurred.)	dimensionless	no_bcodmo_term
day_local	Day of month (local time) when the sampling event occurred.	dd (01 to 31)	day_local
time_local	Time (local) when the sampling event occurred; 24-hour clock.	HHMM.mm	time_local
depth	Depth of water sampling.	meters	depth
replicate	Replicate identifier. (All of the "A" pH samples are from the same bottle, however "A" replicates for pH are unrelated to "A" replicates in the other PICO datasets.)	text	replicate
pH	Spectrophotometric pH measured at 25 degrees C using the total hydrogen ion scale.	unitless; pH scale	pH
pH_qflag	Quality score for pH: 1 = excellent (no known issues); 2 = suspect; 3 = poor (known reason to suspect data).	dimensionless	qflag
yrday	Consecutive day of year for a specified year, as a decimal. The fraction of the value represents the time within the day (e.g. a value of 1.5 means January 1 at 1200 hours).	dimensionless	yrday
ISO_DateTime_Local	Date-time (local) formatted to ISO 8601 standard.	YYYY-MM-DDTHH:MM:SS.ss	ISO_DateTime_Local

Database

Contribute Data

Dataset: pH
Deployment: PICO_1-301

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: pHDeployment: PICO_1-301

Dataset acquisition description

Dataset Processing Description

Dataset: pH
Deployment: PICO_1-301