TY - JOUR
T1 - High-Resolution In Situ Analysis of Nitrate and Phosphate in the Oligotrophic Ocean
AU - Adornato, Lori R.
AU - Kaltenbacher, Eric A.
AU - Greenhow, Danielle R.
AU - Byrne, Robert H.
PY - 2007/1/1
Y1 - 2007/1/1
N2 - Accurate, high-resolution profiles of nitrate and phosphate distributions in the open ocean are difficult to obtain using conventional techniques. Concentrations typically range from low nanomolar levels in the stratified euphotic zone to micromolar levels below the nutricline. With multiple pumps, a heating cartridge, a long-path-length cell, and a multiwavelength spectrometer, the reconfigured Spectrophotometric Elemental Analysis System (SEAS) provides the capability to fully ascertain the distributions of nitrate and phosphate in the upper 200 m of the oligotrophic ocean. By utilizing a 15 cm path length and multiple wavelength spectrophotometry, SEAS can detect nitrate concentrations from 2 nM to 20 μM and, with a 50 cm path length, can accurately measure phosphate concentrations from 1 nM to 1 μM. SEAS is capable of collecting auxiliary data from up to four separate instruments, including a CTD, a fluorometer, a PAR sensor, and a second SEAS instrument. Sampling frequency depends on peripheral instrument selection and ranges from 0.4 to 0.75 Hz.
AB - Accurate, high-resolution profiles of nitrate and phosphate distributions in the open ocean are difficult to obtain using conventional techniques. Concentrations typically range from low nanomolar levels in the stratified euphotic zone to micromolar levels below the nutricline. With multiple pumps, a heating cartridge, a long-path-length cell, and a multiwavelength spectrometer, the reconfigured Spectrophotometric Elemental Analysis System (SEAS) provides the capability to fully ascertain the distributions of nitrate and phosphate in the upper 200 m of the oligotrophic ocean. By utilizing a 15 cm path length and multiple wavelength spectrophotometry, SEAS can detect nitrate concentrations from 2 nM to 20 μM and, with a 50 cm path length, can accurately measure phosphate concentrations from 1 nM to 1 μM. SEAS is capable of collecting auxiliary data from up to four separate instruments, including a CTD, a fluorometer, a PAR sensor, and a second SEAS instrument. Sampling frequency depends on peripheral instrument selection and ranges from 0.4 to 0.75 Hz.
UR - https://digitalcommons.usf.edu/msc_facpub/1640
UR - https://doi.org/https://doi.org/10.1021/es0700855
U2 - 10.1021/es0700855
DO - 10.1021/es0700855
M3 - Article
VL - 41
JO - Environmental Science Technology
JF - Environmental Science Technology
ER -