Rosette Bottle Data (nutrients and chlorophyll) from R/V Alpha Helix cruises HX242, HX244, HX247, HX271, and HX275 to the Coastal Gulf of Alaska from 2001-2003 as part of the U.S. GLOBEC program (NEP project)

Website: https://www.bco-dmo.org/dataset/2474
Data Type: Cruise Results
Version: 1
Version Date: 2007-03-28

Project
» U.S. GLOBEC Northeast Pacific (NEP)

Program
» U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)
ContributorsAffiliationRole
Strom, SuzanneWestern Washington University (WWU)Principal Investigator
Allison, DickyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
Rosette Bottle Data (nutrients and chlorophyll) from R/V Alpha Helix cruises HX242, HX244, HX247, HX271, and HX275 to the Coastal Gulf of Alaska from 2001-2003 as part of the U.S. GLOBEC program.


Coverage

Spatial Extent: N:60.595 E:-146.6074 S:58.097 W:-150.419
Temporal Extent: 2001-04 - 2003-08

Dataset Description

Bottle Data (nutrients, salinities, pigments) from rosette casts from CGOA process cruises.

Rosette Bottle Data from Alpha Helix Cruises

Summary prepared by Erin Macri [WWU]; Prepared for serving: H. Batchelder, 2 Sept 2004
Re-served for text or mapserver access Jan 2007, GLOBEC DMO

Data Contact:
Suzanne L. Strom
Western Washington University
Shannon Point Marine Center
1900 Shannon Point Road
Anacortes, WA 98221-4042
stroms@cc.wwu.edu
Phone: 360-293-2188
FAX: 360-293-1083


Acquisition Description

Water column chlorophyll samples were size-fractionated using a 'fractionation cascade' . Water passed through a sequential arrangement of three filters: 20 um pore-size polycarbonate (47 mm), 5 um pore-size polycarbonate (47 mm) and 0.7 um effective pore-size glass fiber (25 mm). Preliminary tests showed that 47-mm glass fiber filters had a reduced chlorophyll extraction efficiency compared with filters 25 mm in diameter. Filters were immediately placed in 90% acetone, extracted 24 hr (-20degC, darkness), and analyzed for chlorophyll and phaeopigments a on a Turner TD700 (April, May) or Turner 112 (July) fluorometer. Total chlorophyll concentrations were estimated from the sum of the three size fractions.


Processing Description

1. Physical data processed by Tom Weingartner (UAF)
2. Chlorophylls provided by Suzanne Strom (WWU)
3. Nutrient analysis provided by Calvin Mordy (NOAA/PMEL)
4. Dates and times are in Local; Local is +8 hours from GMT e.g., 1100 GMT ==> 0300 Local


[ table of contents | back to top ]

Parameters

ParameterDescriptionUnits
cruiseidShort-hand name of the cruise. text
year4-digit year in YYYY format. unitless
castCTD Cast Number. dimensionless
station_stdStandard Station Name. dimensionless
stationAlternate Station Name, used on cruise. dimensionless
latlatitude, N is positive decimal degrees
lonlongitude, W is negative decimal degrees
date_localMonth/Day/Year. mm/dd/yy
time_localLocal time, 24-hour clock. HHMM
yrday_local Julian day Jan. 1 = 1, decimal day, for plotting
eventEvent number used on cruise. eg. ev#001 = 1
depth target depth for bottle to trip meters
depth_real actual depth bottle tripped meters
chla_gt_20um chlorophyll a concentration in water that passed through 20 micron filter micrograms/liter
chla_5_to_20 chlorophyll a concentration in water that passed through 20 micron filter and caught on 5 micron filter micrograms/liter
chla_lt_5 chlorophyll a concentration in water that passed through 5 micron filter micrograms/liter
chla_total total chlorophyll a concentration micrograms/liter
PO4 phosphate concentration micromoles/L
Si silicate concentration micromoles/L
NO3 nitrate (after subtracting NO2 from total nitrate) micromoles/L
NO2 nitrite concentration micromoles/L
temp temperature degrees C
sal salinity psu (unitless)
sigma_t sigma-t density kg/m3
flvolt fluorometer reading volts
par_v photosynthetically available radiation volts
month_localMonth, local time. mm (01 to 12)
day_localDay of month, local time. dd (01 to 31)


[ table of contents | back to top ]

Instruments

Dataset-specific Instrument Name
Niskin Bottle
Generic Instrument Name
Niskin bottle
Dataset-specific Description
Niskin bottle cast, use Bottle_Niskin
Generic Instrument 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.


[ table of contents | back to top ]

Deployments

HX242

Website
Platform
R/V Alpha Helix
Report
Start Date
2001-04-17
End Date
2001-05-01
Description
Original cruise data are available from the NSF R2R data catalog

Acquisition Description
Water column chlorophyll samples were size-fractionated using a 'fractionation cascade' . Water passed through a sequential arrangement of three filters: 20 um pore-size polycarbonate (47 mm), 5 um pore-size polycarbonate (47 mm) and 0.7 um effective pore-size glass fiber (25 mm). Preliminary tests showed that 47-mm glass fiber filters had a reduced chlorophyll extraction efficiency compared with filters 25 mm in diameter. Filters were immediately placed in 90% acetone, extracted 24 hr (-20degC, darkness), and analyzed for chlorophyll and phaeopigments a on a Turner TD700 (April, May) or Turner 112 (July) fluorometer. Total chlorophyll concentrations were estimated from the sum of the three size fractions.

HX244

Website
Platform
R/V Alpha Helix
Report
Start Date
2001-05-17
End Date
2001-05-31
Description
Original cruise data are available from the NSF R2R data catalog

Acquisition Description
Water column chlorophyll samples were size-fractionated using a 'fractionation cascade' . Water passed through a sequential arrangement of three filters: 20 um pore-size polycarbonate (47 mm), 5 um pore-size polycarbonate (47 mm) and 0.7 um effective pore-size glass fiber (25 mm). Preliminary tests showed that 47-mm glass fiber filters had a reduced chlorophyll extraction efficiency compared with filters 25 mm in diameter. Filters were immediately placed in 90% acetone, extracted 24 hr (-20degC, darkness), and analyzed for chlorophyll and phaeopigments a on a Turner TD700 (April, May) or Turner 112 (July) fluorometer. Total chlorophyll concentrations were estimated from the sum of the three size fractions.

HX247

Website
Platform
R/V Alpha Helix
Report
Start Date
2001-07-12
End Date
2001-07-26
Description
Original cruise data are available from the NSF R2R data catalog

Acquisition Description
Water column chlorophyll samples were size-fractionated using a 'fractionation cascade' . Water passed through a sequential arrangement of three filters: 20 um pore-size polycarbonate (47 mm), 5 um pore-size polycarbonate (47 mm) and 0.7 um effective pore-size glass fiber (25 mm). Preliminary tests showed that 47-mm glass fiber filters had a reduced chlorophyll extraction efficiency compared with filters 25 mm in diameter. Filters were immediately placed in 90% acetone, extracted 24 hr (-20degC, darkness), and analyzed for chlorophyll and phaeopigments a on a Turner TD700 (April, May) or Turner 112 (July) fluorometer. Total chlorophyll concentrations were estimated from the sum of the three size fractions.

HX271

Website
Platform
R/V Alpha Helix
Report
Start Date
2003-04-24
End Date
2003-05-15
Description
Original cruise data are available from the NSF R2R data catalog

Acquisition Description
Water column chlorophyll samples were size-fractionated using a 'fractionation cascade' . Water passed through a sequential arrangement of three filters: 20 um pore-size polycarbonate (47 mm), 5 um pore-size polycarbonate (47 mm) and 0.7 um effective pore-size glass fiber (25 mm). Preliminary tests showed that 47-mm glass fiber filters had a reduced chlorophyll extraction efficiency compared with filters 25 mm in diameter. Filters were immediately placed in 90% acetone, extracted 24 hr (-20degC, darkness), and analyzed for chlorophyll and phaeopigments a on a Turner TD700 (April, May) or Turner 112 (July) fluorometer. Total chlorophyll concentrations were estimated from the sum of the three size fractions.

HX275

Website
Platform
R/V Alpha Helix
Report
Start Date
2003-07-20
End Date
2003-08-12
Description
Original cruise data are available from the NSF R2R data catalog

Acquisition Description
Water column chlorophyll samples were size-fractionated using a 'fractionation cascade' .

Processing Description
Water passed through a sequential arrangement of three filters: 20 um pore-size polycarbonate (47 mm), 5 um pore-size polycarbonate (47 mm) and 0.7 um effective pore-size glass fiber (25 mm). Preliminary tests showed that 47-mm glass fiber filters had a reduced chlorophyll extraction efficiency compared with filters 25 mm in diameter. Filters were immediately placed in 90% acetone, extracted 24 hr (-20degC, darkness), and analyzed for chlorophyll and phaeopigments a on a Turner TD700 (April, May) or Turner 112 (July) fluorometer. Total chlorophyll concentrations were estimated from the sum of the three size fractions. Summary prepared by Erin Macri [WWU] Prepared for serving: H. Batchelder, 2 Sept 2004 Re-served for text or mapserver access Jan 2007, GLOBEC DMO 1. Physical data processed by Tom Weingartner (UAF) 2. Chlorophylls provided by Suzanne Strom (WWU) 3. Nutrient analysis provided by Calvin Mordy (NOAA/PMEL)) 4. Dates and times are in Local; Local is +8 hours from GMT e.g., 1100 GMT ==> 0300 Local


[ table of contents | back to top ]

Project Information

U.S. GLOBEC Northeast Pacific (NEP)


Coverage: Northeast Pacific Ocean, Gulf of Alaska


Program in a Nutshell

Goal: To understand the effects of climate variability and climate change on the distribution, abundance and production of marine animals (including commercially important living marine resources) in the eastern North Pacific. To embody this understanding in diagnostic and prognostic ecosystem models, capable of capturing the ecosystem response to major climatic fluctuations.

Approach: To study the effects of past and present climate variability on the population ecology and population dynamics of marine biota and living marine resources, and to use this information as a proxy for how the ecosystems of the eastern North Pacific may respond to future global climate change. The strong temporal variability in the physical and biological signals of the NEP will be used to examine the biophysical mechanisms through which zooplankton and salmon populations respond to physical forcing and biological interactions in the coastal regions of the two gyres. Annual and interannual variability will be studied directly through long-term observations and detailed process studies; variability at longer time scales will be examined through retrospective analysis of directly measured and proxy data. Coupled biophysical models of the ecosystems of these regions will be developed and tested using the process studies and data collected from the long-term observation programs, then further tested and improved by hindcasting selected retrospective data series.



[ table of contents | back to top ]

Program Information

U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)


Coverage: Global


U.S. GLOBEC (GLOBal ocean ECosystems dynamics) is a research program organized by oceanographers and fisheries scientists to address the question of how global climate change may affect the abundance and production of animals in the sea.

The U.S. GLOBEC Program currently had major research efforts underway in the Georges Bank / Northwest Atlantic Region, and the Northeast Pacific (with components in the California Current and in the Coastal Gulf of Alaska). U.S. GLOBEC was a major contributor to International GLOBEC efforts in the Southern Ocean and Western Antarctic Peninsula (WAP).



[ table of contents | back to top ]

Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)
National Oceanic and Atmospheric Administration (NOAA)

[ table of contents | back to top ]