Oceanic Photosynthetic Pigment Concentrations Measured during the JGOFS Equatorial Pacific Process Study (EQPAC)

The Equatorial Pacific Process Study (EQPAC) was conducted along 140 deg W
longitude during 1992.

Four cruises took place: February 3 - March 9, March 19 - April 15,
August 5 - September 18, and September 24 - October 21. A fifth benthic
cruise and sediment trap legs were added. During the first cruise
(TT007), 15 stations were occupied along 140 deg W longitude from
12 deg N latitude to 12 deg S latitude. During the second cruise
(TT008), data were collected at 8 stations along 140 deg W longitude
from 9 deg S latitude to 9 deg N latitude. During the third cruise
(TT011), data were collected at 15 stations along 140 deg W from 12 deg N
latitude to 12 deg S latitude. During the fourth cruise (TT012), data were
collected at 5 stations along 140 deg W longitude from 17 deg S
latitude to the equator.

Chlorophyll-a and total phaeopigment concentrations were measured
by fluorometer on both the CTD rosette casts and the TM (clean trace
metal) rosette casts. The following pigments were also measured on
the CTD rosette casts only: phycoerythrin; chlorophyll b;
chlorophylls c1, c2 and c3; chlorophyllide a; peridinin; fucoxanthin;
prasinoxanthin; violaxanthin; diadinoxanthin; alloxanthin;
diatoxanthin; zeaxanthin; alpha-carotene; and beta-carotene. In addition to
pigment concentrations, pigment size fractions were also measured for
the pigments measured on the CTD rosette casts.

The data is public domain and can be retrieved on-line at
"http://usjgofs.whoi.edu/jg/dir/jgofs/"

[The information in this summary was taken from the JGOFS
World Wide Web pages.]