In:
Earth System Science Data, Copernicus GmbH, Vol. 11, No. 3 ( 2019-09-25), p. 1437-1461
Abstract:
Abstract. The Global Ocean Data Analysis Project (GLODAP) is a
synthesis effort providing regular compilations of surface to bottom ocean
biogeochemical data, with an emphasis on seawater inorganic carbon chemistry
and related variables determined through chemical analysis of water samples.
This update of GLODAPv2, v2.2019, adds data from 116 cruises to the previous
version, extending its coverage in time from 2013 to 2017, while also adding
some data from prior years. GLODAPv2.2019 includes measurements from more
than 1.1 million water samples from the global oceans collected on 840
cruises. The data for the 12 GLODAP core variables (salinity, oxygen,
nitrate, silicate, phosphate, dissolved inorganic carbon, total alkalinity,
pH, CFC-11, CFC-12, CFC-113, and CCl4) have undergone extensive quality
control, especially systematic evaluation of bias. The data are available in
two formats: (i) as submitted by the data originator but updated to WOCE
exchange format and (ii) as a merged data product with adjustments applied
to minimize bias. These adjustments were derived by comparing the data from
the 116 new cruises with the data from the 724 quality-controlled cruises of
the GLODAPv2 data product. They correct for errors related to measurement,
calibration, and data handling practices, taking into account any known or
likely time trends or variations. The compiled and adjusted data product is
believed to be consistent to better than 0.005 in salinity, 1 % in oxygen,
2 % in nitrate, 2 % in silicate, 2 % in phosphate, 4 µmol kg−1 in dissolved inorganic carbon, 4 µmol kg−1 in total
alkalinity, 0.01–0.02 in pH, and 5 % in the halogenated transient
tracers. The compilation also includes data for several other variables,
such as isotopic tracers. These were not subjected to bias comparison or
adjustments. The original data, their documentation and DOI codes are available in the
Ocean Carbon Data System of NOAA NCEI
(https://www.nodc.noaa.gov/ocads/oceans/GLODAPv2_2019/, last access: 17 September 2019). This
site also provides access to the merged data product, which is provided as a
single global file and as four regional ones – the Arctic, Atlantic, Indian,
and Pacific oceans – under https://doi.org/10.25921/xnme-wr20
(Olsen et al., 2019). The
product files also include significant ancillary and approximated data.
These were obtained by interpolation of, or calculation from, measured data.
This paper documents the GLODAPv2.2019 methods and provides a broad overview
of the secondary quality control procedures and results.
Type of Medium:
Online Resource
ISSN:
1866-3516
DOI:
10.5194/essd-11-1437-2019
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2019
detail.hit.zdb_id:
2475469-9
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