Dataset: emet_W1_1997
Deployment: EN302

MET 1 minute data from 1997 cruises

Principal Investigator:

Dr Richard Payne (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

Robert C. Groman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. GLOBEC Georges Bank (GB)

Data URL:

https://www.bco-dmo.org/dataset-deployment/449713/data

Expand/Collapse All

Description

Continuous along track meteorology and sea surface data,
1 minute values, 1997

Processed by:

Richard Payne
Woods Hole Oceanographic Institution 
Woods Hole, MA 20543
rpayne@whoi.edu
 
Additional 
data processing notes are available.

The sea surface temperature as measured by the hull sensor is not shown since the sea surface temperature as measured via the engine inlet (field name is temp_ss1) is more accurate.

Processing Notes

Concatenate daily 1 minute files into one file for whole cruise
Edit file for obvious bad data, i.e., missing data, garbage characters, etc.
Run program which reformats data. Output parameters:
Year day, lat, long, Speed made good, course made good, gyro 1 & 2, Edo speed, Edo indicator, port wind speed, starboard ws, port wind azimuth, starboard waz, air temp, relative humidity, barometric pressure, sea surface temp @5m & 1m depth, Edo depth, Chirp sonar depth.
Put plots of all parameters on screen and look for obvious single bad points. Edit in basic concatenated file. Except I have not edited depths.
Iterate steps 2-4 until no more obvious bad points.
Run second program which computes true wind speed and direction from speed and course made good, gyros, larger of port or starboard ws and accompanying wind azimuth. Outputs are year day, lat lon, speed and course made good, gyro, relative ws and direction, true ws and direction, air temp, relative humidity, barometric pressure, short- and long-wave radiation,5m and 1m sea surface temps, Edo depth, Chirp sonar depth, Edo speed, Edo indicator.
Check plots of true wind speed and direction to make sure they look ok.
Run vector averaging program which produces 60 minute series. The program uses 60 consecutive records and does not check for missing records. I have not carried depths since hourly averages do not seem useful nor Edo speeds since they seem pretty generally useless. Output parameters are: Year day, lat, long, true wind speed and direction, air temp, relative humidity, barometric pressure, short- and long-wave radiation, sea surface temp @ 5m & 1m.

Specific notes:

The data quality is generally pretty poor on the Oceanus cruises. OC297 and OC298 have no SOG, COG,or gyro so I could not correct the winds. I almost set the TWS, TWD to 0 but decided to leave them in as RWS, RWD. One could get a semiqualitative feel for the winds. OC301 had gyro but no SOG, COG so I computed them from the GPS position differences. It came out better than I expected. Warn users to be skeptical about the Oceanus data.

From: Richard E. Payne / 11 Apr 1997 09:05:25 -0400
Updated: April 28, 2004; G.Heimerdinger

Methods & Sampling

Dataset acquisition description

The sea surface temperature as measured by the hull sensor is not shown since the sea surface temperature as measured via the engine inlet (field name is temp_ss1) is more accurate.

Deployment-specific acquisition description

The sea surface temperature as measured by the hull sensor is not shown since the sea surface temperature as measured via the engine inlet (field name is temp_ss1) is more accurate.

Data Processing Description

Dataset Processing Description

Concatenate daily 1 minute files into one file for whole cruise
Edit file for obvious bad data, i.e., missing data, garbage characters, etc.
Run program which reformats data. Output parameters:
Year day, lat, long, Speed made good, course made good, gyro 1 & 2, Edo speed, Edo indicator, port wind speed, starboard ws, port wind azimuth, starboard waz, air temp, relative humidity, barometric pressure, sea surface temp @5m & 1m depth, Edo depth, Chirp sonar depth.
Put plots of all parameters on screen and look for obvious single bad points. Edit in basic concatenated file. Except I have not edited depths.
Iterate steps 2-4 until no more obvious bad points.
Run second program which computes true wind speed and direction from speed and course made good, gyros, larger of port or starboard ws and accompanying wind azimuth. Outputs are year day, lat lon, speed and course made good, gyro, relative ws and direction, true ws and direction, air temp, relative humidity, barometric pressure, short- and long-wave radiation,5m and 1m sea surface temps, Edo depth, Chirp sonar depth, Edo speed, Edo indicator.
Check plots of true wind speed and direction to make sure they look ok.
Run vector averaging program which produces 60 minute series. The program uses 60 consecutive records and does not check for missing records. I have not carried depths since hourly averages do not seem useful nor Edo speeds since they seem pretty generally useless. Output parameters are: Year day, lat, long, true wind speed and direction, air temp, relative humidity, barometric pressure, short- and long-wave radiation, sea surface temp @ 5m & 1m.

Edo depth error correction: replace bad value with previous value.
EN296 - Second GPS missing through most of file. Not significant since
        I usually use the Trimble. About 2 hours of SW & LW data missing
        on day 69 in early afternoon. Heavy clouds so SW low and LW
        steady. Interpolated values. Only a very few Edo depth values.
        18067 records, 8 interpolated.
Cruise Exp   Spds  Dirs   AT   RH    BP   SST   SSC   SWR  Prec
EN296 GLOBEC ---   ---   ---  ---   ---  ---    ---   ---  ---

Deployment-specific processing description

<ol>
<li>Concatenate daily 1 minute files into one file for whole cruise
<li>Edit file for obvious bad data, i.e., missing data, garbage
characters, etc.
<li>Run program which reformats data. Output parameters:<br>
Year day, lat, long, Speed made good, course made good, gyro 1 & 2,
Edo speed, Edo indicator, port wind speed, starboard ws, port wind
azimuth, starboard waz, air temp, relative humidity, barometric
pressure, sea surface temp @5m & 1m depth, Edo depth, Chirp sonar depth.

<li>Put plots of all parameters on screen and look for obvious single bad
points. Edit in basic concatenated file. Except I have not edited
depths.
<li>Iterate steps 2-4 until no more obvious bad points.
<li>Run second program which computes true wind speed and direction from
speed and course made good, gyros, larger of port or starboard ws and
accompanying wind azimuth. Outputs are year day, lat lon, speed and
course made good, gyro, relative ws and direction, true ws and
direction, air temp, relative humidity, barometric pressure, short- and
long-wave radiation,5m and 1m sea surface temps, Edo depth, Chirp sonar
depth, Edo speed, Edo indicator.
<li>Check plots of true wind speed and direction to make sure they look
ok.
<li>Run vector averaging program which produces 60 minute series. The
program uses 60 consecutive records and does not check for missing
records. I have not carried depths since hourly averages do not seem
useful nor Edo speeds since they seem pretty generally useless. Output
parameters are: Year day, lat, long, true wind speed and direction, air
temp, relative humidity, barometric pressure, short- and long-wave
radiation, sea surface temp @ 5m & 1m.
</li></ol>
<pre>
Edo depth error correction: replace bad value with previous value.
EN302 - Lots of Magellan GPS data missing in first few days. No useful
EDO depth data. Otherwise pretty clean.
Cruise Exp Spds Dirs AT RH BP SST SSC SWR Prec
EN302 GLOBEC --- --- --- --- --- --- --- --- ---
</pre>

More information about this dataset deployment

Funding

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

Instruments

Thermosalinograph

Supplied Description:

Thermosalinograph used to obtain a continuous record of sea surface temperature and salinity.

Instrument Type

Generic Name: Thermosalinograph

Acronym: TSG

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/133/

Generic Description:

A thermosalinograph (TSG) is used to obtain a continuous record of sea surface temperature and salinity. On many research vessels the TSG is integrated into the ship's underway seawater sampling system and reported with the underway or alongtrack data.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	cruise identifier		cruiseid
year	year, GMT e.g. 1997.		year
si	scientific investigator responsible for this cruise		investigator
month_gmt	month of year, GMT e.g. 6 is June		month_gmt
day_gmt	day of month, GMT		day_gmt
time_gmt	time of day, GMT, 24 hour clock	hoursandminutes	time_gmt
lat	latitude, south is negative	decimaldegrees	lat
lon	longitude, west is negative	decimaldegrees	lon
depth_w	water depth	meters	depth_w
depth_cs	Chirp Sonar water depth	meters	depth_cs
wind_speed_c	wind speed corrected for ship's motion	meters/second	wind_speed_c
wind_dir_c	wind direction, meteorologic convention, corrected for ship's motion	degrees	wind_dir_c
wind_speed_r	wind speed, relative to ship	meters/second	wind_speed_r
wind_dir_r	wind direction, relative to ship, meteorologic convention	degrees	wind_dir_r
temp_air	air temperature	degreesC	temp_air
humidity	relative humidity	percent	humidity
press_bar	barometric pressure	millibars	press_bar
precip_level	level in the precipitation gauge, total precipitation between two times is the difference in levels (+50 cm if the gauge self-siphoned)	centimeters	precip_level
ed_sw	short wave downward irradiance	watts/meter^2/second	ed_sw
ed_lw	long wave downward irradiance	watts/meter^2/second	ed_lw
temp_ss1	sea surface temperature 1 meter below the surface	degreesC	temp_ss1
temp_ss3	sea surface temperature 3 meters below the surface	degreesC	temp_ss3
temp_ss5	sea surface temperature 5 meters below the surface	degreesC	temp_ss5
cond_mM	sea surface conductivity	mmho/centimeter	cond_mM
sal_ss3	sea surface salinity, nominally measured at 3 meters	PSU	sal_ss3
speed_trim	trimble GPS speed made good	meters/second	speed_trim
course	ship's course	degrees	no_bcodmo_term
course_trim	trimble GPS course made good	degrees	course_trim
yrday_gmt	Julian day, GMT e.g. 29.5 is January 29 at 1200 hours	decimalday	yrday_gmt
numb_records	number of records used to compute this value		no_bcodmo_term

Database

Contribute Data

Dataset: emet_W1_1997
Deployment: EN302

Continuous along track meteorology and sea surface data,
1 minute values, 1997

Processing Notes

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Deployment-specific processing description

Database

Contribute Data

Dataset: emet_W1_1997Deployment: EN302

Continuous along track meteorology and sea surface data, 1 minute values, 1997

Processing Notes

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Deployment-specific processing description

Dataset: emet_W1_1997
Deployment: EN302

Continuous along track meteorology and sea surface data,
1 minute values, 1997