HPLC measured pigments, primary production casts from R/V Thomas G. Thompson TT050 cruise in the Arabian Sea in 1995 (U.S. JGOFS Arabian Sea project)

Website: https://www.bco-dmo.org/dataset/2559
Version: May 8, 2001
Version Date: 2001-05-08

» U.S. JGOFS Arabian Sea (Arabian Sea)

» U.S. Joint Global Ocean Flux Study (U.S. JGOFS)
Bidigare, Robert R.University of HawaiiPrincipal Investigator
Chandler, Cynthia L.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Dataset Description

HPLC measured pigments, samples drawn from Primary Production casts

Methods & Sampling

   PI:        Robert R. Bidigare
   of:        University of Hawaii 
   dataset:   Pigments, HPLC method, from Primary Productivity casts
   dates:     August 18, 1995 to September 11, 1995
   location:  N: 22.4308  S: 9.9586  W: 58.0017  E: 68.7385
   cruise:    TTN-050, Arabian Sea Process cruise #5 (Late SW Monsoon)
   ship:      R/V Thomas Thompson

Data Processing Description

HPLC Pigment methods

Method by Wright et al (Mar. Ecol. Prog. Ser. 1991, 77:183-196) CHLA1, CHLA2, CHLB1 and CHLB2 estimated following the method of Latasa et al (Mar. Chem. 1996, 51:315-324)
Pigment data for P2 & P5: A comparison of the TURNER-determined chlorophyll a concentrations with the HPLC-determined TOTCHLA concentrations (monovinyl chlorophyll a + divinyl chlorophyll a + monovinyl chlorophyllide a; units = ng Chl a equivalents/L) was performed for Process Cruise #2 (TTN-045) and Process Cruise #5 (TTN-050). While good correlations were obtained for both cruises, the slope obtained for Process Cruise #5 was significantly different from 1 (i.e., TURNER > HPLC). This difference was probably caused by the presence of Chl a-related pigments during Process Cruise #5. Thus, we recommend that whenever possible use the HPLC pigment data and not the TURNER pigment data. If HPLC data is not available for a given cast, we further recommend that you use the following equations to transform the TURNER data into HPLC-equivalent concentrations (cf., Babin, M., A. Morel, H. Claustre, A. Bricaud, Z. Kolber and P.G. Falkowski. 1996. Nitrogen- and irradiance-dependent variations of the maximum quantum yield of carbon fixation in eutrophic, mesotrophic and oligotrophic marine systems. Deep-Sea Research, in press). Results of geometric mean regression analyses (reduced major axis): Y = HPLC TOTCHLA (monovinyl chlorophyll a + divinyl chlorophyll a + monovinyl chlorophyllide a), units = ng Chl a equivalents/L X = TURNER chlorophyll a (it is necessary to convert the Turner Chl a concentrations in the Arabian Sea data base from mg/m3 to ng/L by multiplying concentrations by 1000) (1) Process Cruise #2 (TTN-045) HPLC TOTCHLA = TURNER*(0.975) + 4.833 (r = 0.9822, n = 146) (2) Process Cruise #5 (TTN-050) HPLC TOTCHLA = TURNER*(0.708) + 12.881 (r = 0.9772, n = 575) Robert R. Bidigare Department of Oceanography University of Hawaii Honolulu, HI 96822 808-956-6567 (voice mail) 808-956-9516 (fax)

[ table of contents | back to top ]

Data Files

(Comma Separated Values (.csv), 20.84 KB)
Primary data file for dataset ID 2559

[ table of contents | back to top ]


eventevent number, from event log
stastation number, from event log
sta_stdArabian Sea standard station identifier
castcast number, from event log
botrosette bottle number
depth_nnominal sample depth meters
chlide_aChlorophyllide a nanogram/liter
chl_c3Chlorophyll c3 nanogram/liter
chl_cChlorophyll c1 + chlorophyll c2 + Mg 3,8 divinyl pheoporphyrin a5 nanogram/liter
peridininPeridinin nanogram/liter
fucox_but19'-Butanoyloxyfucoxanthin nanogram/liter
fucoxFucoxanthin nanogram/liter
fucox_hex19'-Hexanoyloxyfucoxanthin nanogram/liter
cis_fucoxCis-fucoxanthin nanogram/liter
cis_hexCis-19'-hexanoyloxyfucoxanthin nanogram/liter
prasinoxPrasinoxanthin nanogram/liter
violaxViolaxanthin nanogram/liter
diadinoxDiadinoxanthin nanogram/liter
alloxAlloxanthin nanogram/liter
diatoxDiatoxanthin nanogram/liter
luteinLutein nanogram/liter
zeaxZeaxanthin nanogram/liter
carotene_aalpha-carotene nanogram/liter
carotene_bbeta-carotene nanogram/liter
chl_b2Divinyl chlorophyll b nanogram/liter
chl_b1Monovinyl chlorophyll b nanogram/liter
chl_a2Divinyl chlorophyll a nanogram/liter
chl_a1Monovinyl chlorophyll a nanogram/liter
chl_b_totDivinyl chlorophyll b plus Monovinyl chlorophyll b nanogram/liter
chl_a_totDivinyl chlorophyll a plus Monovinyl chlorophyll a plus chlorophyllide a nanogram/liter

[ table of contents | back to top ]


Dataset-specific Instrument Name
Niskin Bottle
Generic Instrument Name
Niskin bottle
Dataset-specific Description
CTD/Niskin Rosette bottles
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.

Dataset-specific Instrument Name
Trace Metal Bottle
Generic Instrument Name
Trace Metal Bottle
Dataset-specific Description
Trace Metal (TM) Rosette bottles
Generic Instrument Description
Trace metal (TM) clean rosette bottle used for collecting trace metal clean seawater samples.

[ table of contents | back to top ]



R/V Thomas G. Thompson
Start Date
End Date

[ table of contents | back to top ]

Project Information

U.S. JGOFS Arabian Sea (Arabian Sea)

Coverage: Arabian Sea

The U.S. Arabian Sea Expedition which began in September 1994 and ended in January 1996, had three major components: a U.S. JGOFS Process Study, supported by the National Science Foundation (NSF); Forced Upper Ocean Dynamics, an Office of Naval Research (ONR) initiative; and shipboard and aircraft measurements supported by the National Aeronautics and Space Administration (NASA). The Expedition consisted of 17 cruises aboard the R/V Thomas Thompson, year-long moored deployments of five instrumented surface buoys and five sediment-trap arrays, aircraft overflights and satellite observations. Of the seventeen ship cruises, six were allocated to repeat process survey cruises, four to SeaSoar mapping cruises, six to mooring and benthic work, and a single calibration cruise which was essentially conducted in transit to the Arabian Sea.

[ table of contents | back to top ]

Program Information

U.S. Joint Global Ocean Flux Study (U.S. JGOFS)

Coverage: Global

The United States Joint Global Ocean Flux Study was a national component of international JGOFS and an integral part of global climate change research.

The U.S. launched the Joint Global Ocean Flux Study (JGOFS) in the late 1980s to study the ocean carbon cycle. An ambitious goal was set to understand the controls on the concentrations and fluxes of carbon and associated nutrients in the ocean. A new field of ocean biogeochemistry emerged with an emphasis on quality measurements of carbon system parameters and interdisciplinary field studies of the biological, chemical and physical process which control the ocean carbon cycle. As we studied ocean biogeochemistry, we learned that our simple views of carbon uptake and transport were severely limited, and a new "wave" of ocean science was born. U.S. JGOFS has been supported primarily by the U.S. National Science Foundation in collaboration with the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the Department of Energy and the Office of Naval Research. U.S. JGOFS, ended in 2005 with the conclusion of the Synthesis and Modeling Project (SMP).

[ table of contents | back to top ]


Funding SourceAward
National Science Foundation (NSF)

[ table of contents | back to top ]