Dataset: Zooplankton from hypoxic waters of Chesapeake Bay
Deployment: HRS100920JP

Zooplankton - esp. copepods - from hypoxic waters of the Chesapeake Bay

Principal Investigator:

James J. Pierson (University of Maryland Center for Environmental Science, UMCES/HPL)

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Hypoxia in Marine Ecosystems: Implications for Neritic Copepods (DeZoZoo)

Current State:

Final with updates expected

Version:

working

Deployment Synonyms:

DZZ1003

Version Date:

2015-08-26

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/564760/data

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Description

These data represent a merging of electronic data collected from the MOCNESS sensor systems and the count data from the samples collected with the net tows. Some nets were used for zooplankton samples, while others were collected specifically to estimate bay anchovy concentrations. (See associated dataset: http://www.bco-dmo.org/dataset/563428.) These are contained on different sheets, and the count data was merged individually.

Methods & Sampling

Dataset acquisition description

Data Processing Description

Dataset Processing Description

Electronic data was post-processed by PI Pierson. Zooplankton sorting data was analyzed, processed, and quality controlled in PI Pierson's lab.

DMO adjustments: added column for official cruise name; replaced sal=50 (error) with sal=nd; changed C. canadensis in parenthesis to Coullana canadensis in the appropriate columns; used MOCNESS start lats and lons as best, according to PI instructions; removed MOCNESS-recorded times and used GPS times instead, which is much more accurate (according to PI instructions); changed decimal days for 1102 (HRS110719JP) to HH:MM;

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0961924	NSF Division of Ocean Sciences

Instruments

MOCNESS.25

Supplied Name: 1/4 Meter MOC

Supplied Description:

Had trouble communicating with the 1/4 m2 MOCNESS in the beginning of the first cruise. Picked up replacement parts and were able to get it working again with an underwater unit borrowed from BESS, the manufacturer of the MOCNESS system. (Subsequent analysis by BESS, Inc. showed that some damage to the underwater unit was caused when it was plugged into the sea cable with some charge still in the cable -- most likely from the Seabird deck unit still turned on.) -- from the Cruise Report

Instrument Type

Generic Name: MOCNESS.25

Acronym: MOC.25

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. The MOCNESS-1/4 carries nine 1/4-m2 nets usually of 64 micrometer mesh and is used to sample the larger micro-zooplankton.

Tucker Trawl

Supplied Description:

1 m2 Tucker Trawl fitted with 280 um mesh.

Instrument Type

Generic Name: Tucker Trawl

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0161/

Generic Description:

The original Tucker Trawl, a net with a rectangular mouth opening first built in 1951 by G.H. Tucker, was not an opening/closing system, but shortly thereafter it was modified so that it could be opened and closed. The original had a 183 cm by 183 cm flexible rectangular mouth opening 914 cm long net with 1.8 cm stretched mesh for the first 457 cm and 1.3 cm mesh for last 457 cm. 152 cm of coarse plankton or muslin netting lined the end of the net. Tucker designed the net to collect animals associated with the deep scattering layers, principally euphausiids, siphonophores, and midwater fish. (from Wiebe and Benfield, 2003). Currently used Tucker Trawls usually have 1-m2 openings and can have a single net or multiple nets on the frame.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	official cruise name	text	cruise_id
cruise_informal	The Year and the cruise series. i.e. 1101 = the first cruise in 2011	text	cruise_id
year	year	time	year
month_local	month	time	month_local
tow	MOCNESS trawl series number	text	tow
day_local	day in local time	time	day_local
net	net number	text	net
gear	the sampling gear	text	instrument
time_local	local time of day	HH:MM	time
lat_best	the latitude when a MOCNESS tow starts; considered the best latitude by the PI	decimal degrees	lat
lon_best	the longitude when a MOCNESS tow starts; considered the best longitude by the PI	decimal degrees	lon
yrday_local	day of year in local time	time	yrday_local
vol_filt	filtration volume, i.e the volume of water flowing through the net	cubic meters	vol_filt
temp	water temperature	degrees centrigrade	temperature
sal	water salinity	PSU	sal
O2_mg_L	dissolved Oxygen	milligrams per liter	O2_mg_L
fluor	Chlorophyll a concentration from Wetlabs FLNTU	milligrams per cubic meter	fluor
turbidity	turbidity measured in Nephelometric Turbidity Unites (NTU) from Wetlabs FLNTU	NTU	turbidity
PAR	Photosynthetically available radiation	microEinsteins per square meter per second	PAR
lat_end	the latitude when a MOCNESS tow ends	decimal degrees	lat_end
lon_end	the longitude when a MOCNESS tow ends	decimal degrees	lon_end
low_depth_best	the surface depth of a net trawl; considered the best depth by the PI	m	depth
high_depth_best	the bottom depth of a net trawl; considered the best depth by the PI	m	depth
angle	MOCNESS trawl angle	degrees	tow_angle
dist	the tow distance	kilometers	no_bcodmo_term
area_net	the net mouth opening area	meters square	no_bcodmo_term
site	sampling station: north or south	text	site
splits	the number of times the sample is split in half	number	no_bcodmo_term
dilution	the dilution volume of a split sample	ml	dilution
subsample_size	the subsample volume from a diluted sample	ml	sample_volume
genus	the genus name	text	genus
species	the species name	text	species
stage	the copepod stages: nauplii (N1-N6); copepodite (C1-C5); adult (Female or Male)	text	stage
count_subsample	the counted numbers in a subsample	number	count
abund_m3	number of individuals per cubic meter sampled	number	abundance
abund_m2	integrated abundance; number of individuals in a square meter	number	abundance

Database

Contribute Data

Dataset: Zooplankton from hypoxic waters of Chesapeake Bay
Deployment: HRS100920JP

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Zooplankton from hypoxic waters of Chesapeake BayDeployment: HRS100920JP

Dataset acquisition description

Dataset Processing Description

Dataset: Zooplankton from hypoxic waters of Chesapeake Bay
Deployment: HRS100920JP