Program and Agenda

Abstract

ANALYSES OF INORGANIC NUTRIENT POOLS BY THE HAWAII OCEAN TIME-SERIES (HOT) PROGRAM: METHODS, PROCEDURES, AND STANDARDIZATION

Quantifying temporal variability and long term trends in pools and fluxes of ocean nutrients is one of the central objectives of the Hawaii Ocean Time-series (HOT) program. Over the past 25 years, nutrient biogeochemistry has become a hallmark component of HOT science. However, the large dynamic range in nutrient concentrations, spanning several orders of magnitude (nanomolar to micromolar), challenges routine analyses in this ecosystem. As a result, HOT has developed a suite of methodologies employed for quantifying nutrient concentrations throughout the water column. These methods include several high sensitivity measurements of inorganic nitrogen and phosphorus concentrations, including soluble reactive phosphorus, nitrate, nitrite, ammonia, and urea. In addition, establishing confidence in the measured nutrient pools demands rigorous quality control, including regular use of standard and internal reference materials to track the analytical performance of each assay. Here, we present the suite of methodological procedures routinely utilized by HOT to quantify inorganic nutrient concentrations. In addition, we describe our quality assurance and control procedures employed to track the reproducibility and performance of HOT nutrient analyses.

ePoster:

Authors

Curless, S. E., University of Hawaii at Manoa, Department of Oceanography, USA, curless@hawaii.edu

Björkman, K. M., University of Hawaii at Manoa, Department of Oceanography, USA, bjorkman@hawaii.edu

Updyke, B., University of Hawaii at Manoa, Department of Oceanography, updyke@hawaii.edu

Mahaffey, C., University of Liverpool, School of Environmental Sciences , United Kingdom, mahaffey@liv.ac.uk

Dore, J. E., Montana State University, Department of Land Resources & Environmental Sciences, USA, jdore@montana.edu

Details

Poster presentation

Session #:049
Date: 2/27/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 2461