Note:
Sampling rates vary from instrument to instrument.

Data Submitted by:

Jim Irish
Woods Hole Oceanographic Institution
Woods Hole, MA 02543
 
phone:  508 289 2732
fax:    508 457 2195
e-mail: jirish@whoi.edu 

1. The nominal position of the mooring is the designed deployment site
   and actual deployments varied by about 0.5 nm around this position.
2. Sensor depths are nominal designed depths.  In water sensors vary
   around this designed depth by about 1 m, variation larger at greater
   distance below buoy.
3. Temperatures are listed in the IPTS68 standard, rather than IPT90.
4. Salinity conversion from conductivity was done with PSS78
5. Sensor normalization was done with pre-cruise calibrations, and checked
   with post-cruise calibrations.
6. Only minor editing has been done to remove spikes from records.
7. No corrections have been made to fluorometer and transmissometer data
   to remove biological fouling induced drift.
8. No corrections have been made to salinity for drifts due to biological
   fouling.

 updated 06/15/05; gfh

Methods & Sampling

One deployment was made in 1998 at this site, Nov 19. 1998 to Mar 11 1999. (Dates reflect dates of data not deployment dates)

Data Processing Description

1. The nominal position of the mooring is the designed deployment site
   and actual deployments varied by about 0.5 nm around this position.
2. Sensor depths are nominal designed depths.  In water sensors vary
   around this designed depth by about 1 m, variation larger at greater
   distance below buoy.
3. Temperatures are listed in the IPTS68 standard, rather than IPT90.
4. Salinity conversion from conductivity was done with PSS78
5. Sensor normalization was done with pre-cruise calibrations, and checked
   with post-cruise calibrations.
6. Only minor editing has been done to remove spikes from records.
7. No corrections have been made to fluorometer and transmissometer data
   to remove biological fouling induced drift.
8. No corrections have been made to salinity for drifts due to biological
   fouling.

Data Files

File
NEP1998.csv (Comma Separated Values (.csv), 31.32 MB) MD5:48ff25ad7fda18d70c851b59cdb34543 Primary data file for dataset ID 2502

More Information about this dataset

Funding Sources

Funding Source	Award Number
National Science Foundation	unknown GB NSF
National Oceanic and Atmospheric Administration	unknown GB NOAA

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
NEP_buoy_dep2	NE_Peak2	1996-10-28	GB NEP Mooring	Robert C. Beardsley (Chief Scientist)	data info
NE_Peak	GLOBEC_GB_NEP_buoy_dep1	1995-11-01	GB NEP Mooring	Jim Irish (Chief Scientist)	data info

Instruments

Acoustic Doppler Current Profiler

Supplied Description:

300-khz RD Instruments Workhorse ADCP mounted in a downward looking configuration in an in-line frame with auxiliary battery pack

Instrument Type

Generic Name: Acoustic Doppler Current Profiler

Acronym: ADCP

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/115/

Generic Description:

The ADCP measures water currents with sound, using a principle of sound waves called the Doppler effect. A sound wave has a higher frequency, or pitch, when it moves to you than when it moves away. You hear the Doppler effect in action when a car speeds past with a characteristic building of sound that fades when the car passes. The ADCP works by transmitting "pings" of sound at a constant frequency into the water. (The pings are so highly pitched that humans and even dolphins can't hear them.) As the sound waves travel, they ricochet off particles suspended in the moving water, and reflect back to the instrument. Due to the Doppler effect, sound waves bounced back from a particle moving away from the profiler have a slightly lowered frequency when they return. Particles moving toward the instrument send back higher frequency waves. The difference in frequency between the waves the profiler sends out and the waves it receives is called the Doppler shift. The instrument uses this shift to calculate how fast the particle and the water around it are moving. Sound waves that hit particles far from the profiler take longer to come back than waves that strike close by. By measuring the time it takes for the waves to bounce back and the Doppler shift, the profiler can measure current speed at many different depths with each series of pings. (More from WHOI instruments listing).

CTD Sea-Bird MicroCAT 37

Supplied Name: MicroCat

Supplied Description:

MicroCAT (SBE-37) was mounted about 72-m depth (4m above bottom) to measure near-bottom water properties

Instrument Type

Generic Name: CTD Sea-Bird MicroCAT 37

Acronym: CTD MicroCAT 37

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/350/

Generic Description:

The Sea-Bird MicroCAT CTD unit is a high-accuracy conductivity and temperature recorder based on the Sea-Bird SBE 37 MicroCAT series of products. It can be configured with optional pressure sensor, internal batteries, memory, built-in Inductive Modem, integral Pump, and/or SBE-43 Integrated Dissolved Oxygen sensor. Constructed of titanium and other non-corroding materials for long life with minimal maintenance, the MicroCAT is designed for long duration on moorings.

In a typical mooring, a modem module housed in the buoy communicates with underwater instruments and is interfaced to a computer or data logger via serial port. The computer or data logger is programmed to poll each instrument on the mooring for its data, and send the data to a telemetry transmitter (satellite link, cell phone, RF modem, etc.). The MicroCAT saves data in memory for upload after recovery, providing a data backup if real-time telemetry is interrupted.

CTD Sea-Bird SEACAT

Supplied Name: Sea-Bird Seacat CTD

Supplied Description:

The SEACATs are mounted parallel with the mooring cable and tie wrapped and taped to the cable.

Instrument Type

Generic Name: CTD Sea-Bird SEACAT

Acronym: CTD SEACAT

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/350/

Generic Description:

The CTD SEACAT recorder is an instrument package manufactured by Sea-Bird Electronics. The first Sea-Bird SEACAT Recorder was the original SBE 16 SEACAT developed in 1987. There are several model numbers including the SBE 16plus (SEACAT C-T Recorder (P optional))and the SBE 19 (SBE 19plus SEACAT Profiler measures conductivity, temperature, and pressure (depth)). M ore information from Sea-Bird Electronics.

LI-COR LI-192 PAR Sensor

Supplied Name: LiCor Scalar Photosynthetically Active Radiation Sensor

Supplied Description:

LiCor scalar(4steradians) PAR sensor.

Instrument Type

Generic Name: LI-COR LI-192 PAR Sensor

Acronym: LI-COR LI-192 PAR

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0120/

Generic Description:

The LI-192 Underwater Quantum Sensor (UWQ) measures underwater or atmospheric Photon Flux Density (PPFD) (Photosynthetically Available Radiation from 360 degrees) using a Silicon Photodiode and glass filters encased in a waterproof housing. The LI-192 is cosine corrected and features corrosion resistant, rugged construction for use in freshwater or saltwater and pressures up to 800 psi (5500 kPa, 560 meters depth). Typical output is in um s-1 m-2. The LI-192 uses computer-tailored filter glass to achieve the desired quantum response. Calibration is traceable to NIST. The LI-192 serial numbers begin with UWQ-XXXXX. LI-COR has been producing Underwater Quantum Sensors since 1973.

These LI-192 sensors are typically listed as LI-192SA to designate the 2-pin connector on the base of the housing and require an Underwater Cable (LI-COR part number 2222UWB) to connect to the pins on the Sensor and connect to a data recording device.

The LI-192 differs from the LI-193 primarily in sensitivity and angular response.
193: Sensitivity: Typically 7 uA per 1000 umol s-1 m-2 in water. Azimuth: < ± 3% error over 360° at 90° from normal axis. Angular Response: < ± 4% error up to ± 90° from normal axis.
192: Sensitivity: Typically 4 uA per 1000 umol s-1 m-2 in water. Azimuth: < ± 1% error over 360° at 45° elevation. Cosine Correction: Optimized for underwater and atmospheric use.
(www.licor.com)

Rotronics Temperature and Humidity Probe

Supplied Name: Rotronics

Supplied Description:

Temperature & Humidity sensor

Instrument Type

Generic Name: Rotronics Temperature and Humidity Probe

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/102/

Generic Description:

Rotronics device used to measure air temperature

Sea Tech Fluorometer

Supplied Name: SeaTech Fluorometer

Supplied Description:

Sea Tech chlorophyll-a fluorometer

Instrument Type

Generic Name: Sea Tech Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

The Sea Tech chlorophyll-a fluorometer has internally selectable settings to adjust for different ranges of chlorophyll concentration, and is designed to measure chlorophyll-a fluorescence in situ. The instrument is stable with time and temperature and uses specially selected optical filters enabling accurate measurements of chlorophyll a. It can be deployed in moored or profiling mode. This instrument designation is used when specific make and model are not known. The Sea Tech Fluorometer was manufactured by Sea Tech, Inc. (Corvalis, OR, USA).

Sea Tech Transmissometer

Supplied Name: SeaTech Transmissometer

Supplied Description:

Sea Tech 25-cm path-length transmissometer

Instrument Type

Generic Name: Sea Tech Transmissometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0003/

Generic Description:

The Sea Tech Transmissometer can be deployed in either moored or profiling mode to estimate the concentration of suspended or particulate matter in seawater. The transmissometer measures the beam attenuation coefficient in the red spectral band (660 nm) of the laser lightsource over the instrument's path-length (e.g. 20 or 25 cm). This instrument designation is used when specific make and model are not known. The Sea Tech Transmissometer was manufactured by Sea Tech, Inc. (Corvalis, OR, USA).

Sea-Bird SBE-3 Temperature Sensor

Supplied Name: SBE-3

Supplied Description:

SBE-3 Temperature

Instrument Type

Generic Name: Sea-Bird SBE-3 Temperature Sensor

Acronym: SBE-3 Temperature

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/134/

Generic Description:

The SBE-3 is a slow response, frequency output temperature sensor manufactured by Sea-Bird Electronics, Inc. (Bellevue, Washington, USA). It has an initial accuracy of +/- 0.001 degrees Celsius with a stability of +/- 0.002 degrees Celsius per year and measures seawater temperature in the range of -5.0 to +35 degrees Celsius. more information from Sea-Bird Electronics

Sea-Bird SBE-4 Conductivity Sensor

Supplied Name: SBE-4

Supplied Description:

SBE-4 Conductivity

Instrument Type

Generic Name: Sea-Bird SBE-4 Conductivity Sensor

Acronym: SBE-4 Conductivity

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0417/

Generic Description:

The Sea-Bird SBE-4 conductivity sensor is a modular, self-contained instrument that measures conductivity from 0 to 7 Siemens/meter. The sensors (Version 2; S/N 2000 and higher) have electrically isolated power circuits and optically coupled outputs to eliminate any possibility of noise and corrosion caused by ground loops. The sensing element is a cylindrical, flow-through, borosilicate glass cell with three internal platinum electrodes. Because the outer electrodes are connected together, electric fields are confined inside the cell, making the measured resistance (and instrument calibration) independent of calibration bath size or proximity to protective cages or other objects.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
brief_desc	data type description	unitless	brief_desc
year_start	starting year of mooring deployment	unitless	year_start
lat	latitude, negative = South	decimal degrees	lat
lon	longitude, negative = West	decimal degrees	lon
depth	depth of instrument, negative = height above sea surf.	meters	depth
hour_gmt	time GMT in hours (0-23)	unitless	hour_gmt
minute_gmt	time GMT in minutes (0-59)	unitless	minute_gmt
seconds_gmt	time GMT in seconds	unitless	seconds_gmt
day_gmt	day of month GMT (1-31)	unitless	day_gmt
month_gmt	month of year GMT (1-12)	unitless	month_gmt
year	year	unitless	year
julian_day	Julian day. In this convention, Julian day 2440000 begins at 0000 hours, May 23, 1968	unitless	julian_day
cond	conductivity	seimens/meter	cond
sal	salinity	PSU	sal
temp	water temperature	decimal deg. C	temp
flvolt	fluorescense	volts	flvolt
opt_back	unknown	unknown	no_bcodmo_term
par_scalar	scalar PAR	microEinstein/meter^2/second	par_scalar
sigma_0	sigma-theta or potential density: density which takes into account adiabatic heating/cooling with changes in pressure	kg/m^3	sigma_0
temp_air	air temperature	decimal deg. C	temp_air
trans	light transmission	volts	trans
yrday_gmt	GMT day and decimal time, as 326.5 for the 326th day of the year, or November 22 at 1200 hours (noon). In the case of drifter data, year day may be continuous over a multi year period.	unitless	yrday_gmt