New Production and Nitrogen-15 Uptake Rates Measured during the JGOFS Equatorial Pacific Process Study
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资源简介：
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.
During the first and third cruises, 6-8 depths were sampled per
station with the cable/rosette system for nitrogen-uptake
measurements. Standard autoanalyzer techniques were used to determine
nitrogen concentrations of each sample. Nitrogen-15 tracer was added
to each sample at 10% of the ambient substrate concentration. The
samples were incubated for 3-4 hours in simulated in situ conditions:
subsurface light was approximated with a combination of neutral
density and colored filters, and temperature was maintained +/- a few
degrees C of the depth from which the sample was collected. Rates of
nitrogen uptake were determined for labeled substrate of nitrate,
nitrite and ammonium. In addition, F-ratios were calculated as
follows: f = pNO3/(pNO3+pNO2+pNH4), where pNO2 is the N-15 uptake rate
from nitrite labeled substrate, pNO3 is the N-15 uptake rate from
nitrate labeled substrate, and pNH4 is the N-15 uptake rate from
ammonium labeled substrate.
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.]
提供机构：
SCIOPS
