Abstract
Abstract. The CARINA project is aimed at gathering and providing secondary quality control checks on carbon and carbon-relevant hydrographic and geochemical data from cruises all across the Atlantic, Arctic and Southern Ocean. In total the project gathered 188 cruises that were not previously available to the public. Of these 188 cruises, 37 are part of the Southern Ocean. Parameters from the Southern Ocean cruises, including total carbon dioxide (TCO2), total alkalinity, oxygen, nitrate, phosphate and silicate, were examined for cruise-to-cruise consistency. pH and chlorofluorocarbons (CFCs) are also part of the data base, but are not discussed here. This paper focuses on the quality control of the Southern Ocean data from the Pacific sector which consisted of 29 cruises of which 17 were included in a previous synthesis called GLODAP, 11 were new cruises from the CARINA dataset, and one cruise was included in GLODAP but was updated with new data and therefore also included in CARINA. The Pacific sector quality control procedures included crossover analysis between stations and inversion analysis of all crossover data. The GLODAP data were included into the analysis as reference cruises but without applying the GLODAP recommended adjustments so the corrections could be independently verified. The outcome of this effort is an internally consistent, high-quality carbon data set for all cruises, including the reference cruises.
Highlights
The development of a CARINA data base dedicated to carbon-relevant cruise data from the Atlantic Ocean was initiated in 1999 as an informal, unfunded project
This paper presents the quality control analysis performed with CARINA and GLODAP data from the Pacific sector of the Southern Ocean
The adjustments proposed by these two inversions were evaluated by comparison with the information deduced from manually generated crossovers. This showed a better agreement with results from the Weighted Dampened Least Squares (WDLSQ) inversion for which a priori assumptions on the quality of the data are made, compared to the slightly less complex Weighted Least Squares (WLSQ) method that uses the standard deviation associated with each crossover to weight the inversion
Summary
The development of a CARINA data base dedicated to carbon-relevant cruise data from the Atlantic Ocean was initiated in 1999 as an informal, unfunded project It resulted in the assembly of a large collection of useful, previously unavailable data. A major previous ocean carbon synthesis effort was called GLODAP: Global Data Analysis Project (Key et al, 2004; Sabine et al, 2005), which primarily evaluated data from the large international WOCE and JGOFS projects in the 1990s. The original data that went into the GLODAP analyses were included in the CARINA analysis This provided an independent validation of the proposed GLODAP corrections and extended the data coverage in order to obtain enough crossover points for all the new cruises to be evaluated.
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