Dataset: secchi depth
Deployment: PICO_1-301

Secchi depth measurements from the PICO time-series station.

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:

03 Sept 2013

Deployment Synonyms:

PICO

Version Date:

2013-09-03

Data URL:

https://www.bco-dmo.org/dataset-deployment/456102/data

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Description

Secchi depth measurements from the Pivers Island Coastal Observatory (PICO) from 2010 to 2012.

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

Methods & Sampling

Dataset acquisition description

Secchi depth was measured in duplicate using a 20 cm disk with four alternating white and black quadrants by lowering the disk until no longer visible and recording the depth.

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

Secchi Disc

Supplied Description:

A 20 cm secchi disk with four alternating white and black quadrants was used.

Instrument Type

Generic Name: Secchi Disc

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0430/

Generic Description:

Typically, a 16 inch diameter white/black quadrant disc used to measure water optical clarity

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
time_qflag	Quality score for time_local: 1 = excellent (no known issues); 2 = suspect; 3 = poor (known reason to suspect data).	dimensionless	q_flag
depth	Depth of water sampling.	meters	depth
replicate	Replicate identifier. (Replicate identifiers from this dataset are unrelated to replicates in the other PICO datasets.)	text	replicate
secchi_depth	Depth (in meters) at which the secchi disk was no longer visible.	meters	depth_secchi
secchi_depth_qflag	Quality score for secchi_depth: 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: secchi depth
Deployment: PICO_1-301

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: secchi depthDeployment: PICO_1-301

Dataset acquisition description

Dataset Processing Description

Dataset: secchi depth
Deployment: PICO_1-301