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The First SeaWiFS HPLC Analysis Round-Robin Experiment (SeaHARRE-1)Four laboratories, which had contributed to various aspects of SeaWiFS calibration and validation activities, participated in the first SeaWiFS HPLC Analysis Round-Robin Experiment (SeaHARRE-1): Horn Point Laboratory (USA), the Joint Research Centre (Italy), the Laboratoire de Physique et Chimie Marines (France), and the Marine and Coastal Management group (South Africa). The analyses of the data are presented in Chapter 1 and the individual methods of the four groups are presented in Chapters 2-5. The average (or overall) conclusions of the round-robin are derived from 12 in situ stations occupied during a cruise in the Mediterranean Sea, although, only 11 stations are used in the analyses. The data set is composed of 12 replicates taken during each sampling opportunity with 3 replicates going to each of the 4 laboratories. The average (or overall) results from the intercomparison of 15 pigments or pigment associations are as follows (in some cases, data subsets that exclude pigments which were not analyzed by all the laboratories, or that had unusually large variances, are used to exclude a variety of problematic pigments): a) the accuracy of the four methods in determining the concentration of total chlorophyll a is 7.9%, (one method did not separate mono- and divinyl chlorophyll a, and if the samples containing significant divinyl chlorophyll a concentrations are ignored, the four methods have an accuracy of 6.7%); b) the accuracy in determining the full set of pigments is 19.1%; c) there is a reduction in accuracy of approximately - 12.2% for every decade (factor of 10) decrease in concentration (based on a data subset); d) the precision of the four methods using a subset data is 8.617( 6.2% for an edited subset); e) the repeatability of the four methods using the subset data is 9.2% (7.2%; for an edited subset, and f) the reproducibility of the four methods using the subset data is 21.31% (15.0% for an edited subset).
Document ID
20010072242
Acquisition Source
Goddard Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Hooker, Stanford B.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Firestone, Elaine R.
(General Sciences Corp. Beltsville, MD United States)
Claustre, Herve
(Paris VI Univ. Villefranche-sur-Mer, France)
Ras, Josephine
(Paris VI Univ. Villefranche-sur-Mer, France)
VanHeukelem, Laurie
(Horn Point Environmental Lab. Cambridge, MD United States)
Berthon, Jean-Francois
(JRC Marine Environment Unit Ispra, Italy)
Targa, Cristina
(JRC Marine Environment Unit Ispra, Italy)
vanderLinde, Dirk
(JRC Marine Environment Unit Ispra, Italy)
Barlow, Ray
(Marine and Coastal Management Cape Town South Africa)
Sessions, Heather
(Marine and Coastal Management Cape Town South Africa)
Date Acquired
September 7, 2013
Publication Date
December 1, 2001
Publication Information
ISSN: 1522-8789
Subject Category
Oceanography
Report/Patent Number
NAS 1.15:206892/VOL14
Rept-2001-00904-0/VOL14
NASA/TM-2000-206892/VOL14
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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