Mapped Observation-Based Oceanic Dissolved Inorganic Carbon (DIC), monthly climatology from January to December (based on observations between 2004 and 2017), from the Max-Planck-Institute for Meteorology (MOBO-DIC_MPIM) (NCEI Accession 0221526)
This dataset contains mapped observation-based oceanic dissolved inorganic carbon (DIC), monthly climatology from January to December (based on observations between 2004 and 2017), from the Max-Planck-Institute for Meteorology (MOBO-DIC_MPIM). The SOM-FFN approach by Landschützer et al. (2013) was extended and applied to obtain time-varying gap-filled mapped fields of dissolved inorganic carbon (DIC) in the water column. In the SOM-FFN approach, the first step is to cluster the ocean into regions of similar physical and biogeochemical properties using self-organizing maps (SOM). In the second step, a feed-forward network (FFN) is run in each SOM-cluster to approximate and apply the statistical relationship between the target data (here: DIC), and better constrained predictor data that are available as mapped global fields. The SOM-FFN method was adjusted and in several ways compared to the original method by Landschützer et al. (2013), that mapped oceanic surface pCO2. As we map the DIC in the water column, we extended the mapping grid from three dimensions (latitude, longitude, and time), to four (latitude, longitude, time, and depth), and instead of monthly inter-annual fields, we resolved a monthly climatology based on the period from 2004 through 2017. As different predictors are available and/or meaningful when mapping DIC in the water column, we also have a different set of predictor data compared to the approach used by Landschützer et al. (2013). To overcome potential biases in the random selection of training and internal validation data, a bootstrapping approach was used, running the SOM-FFN method ten times. The mean across this ensemble was taken as the final DIC field. We defined the standard deviation across the ensemble as the uncertainty within the method, and name it ensemble spread.
Complete Metadata
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| description | This dataset contains mapped observation-based oceanic dissolved inorganic carbon (DIC), monthly climatology from January to December (based on observations between 2004 and 2017), from the Max-Planck-Institute for Meteorology (MOBO-DIC_MPIM). The SOM-FFN approach by Landschützer et al. (2013) was extended and applied to obtain time-varying gap-filled mapped fields of dissolved inorganic carbon (DIC) in the water column. In the SOM-FFN approach, the first step is to cluster the ocean into regions of similar physical and biogeochemical properties using self-organizing maps (SOM). In the second step, a feed-forward network (FFN) is run in each SOM-cluster to approximate and apply the statistical relationship between the target data (here: DIC), and better constrained predictor data that are available as mapped global fields. The SOM-FFN method was adjusted and in several ways compared to the original method by Landschützer et al. (2013), that mapped oceanic surface pCO2. As we map the DIC in the water column, we extended the mapping grid from three dimensions (latitude, longitude, and time), to four (latitude, longitude, time, and depth), and instead of monthly inter-annual fields, we resolved a monthly climatology based on the period from 2004 through 2017. As different predictors are available and/or meaningful when mapping DIC in the water column, we also have a different set of predictor data compared to the approach used by Landschützer et al. (2013). To overcome potential biases in the random selection of training and internal validation data, a bootstrapping approach was used, running the SOM-FFN method ten times. The mean across this ensemble was taken as the final DIC field. We defined the standard deviation across the ensemble as the uncertainty within the method, and name it ensemble spread. |
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| identifier | gov.noaa.nodc:0221526 |
| issued | 2020-11-02T00:00:00.000+00:00 |
| keyword |
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"DEPTH - OBSERVATION",
"DISSOLVED INORGANIC CARBON (DIC)",
"LATITUDE",
"LONGITUDE",
"carbon dioxide (CO2) gas analyzer",
"chemical",
"VARIOUS CHARTERED VESSELS",
"Max Planck Institute for Meteorology - Hamburg",
"Max Planck Institute for Meteorology - Hamburg",
"The Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP)",
"Indian Ocean",
"North Atlantic Ocean",
"North Pacific Ocean",
"South Atlantic Ocean",
"South Pacific Ocean",
"Southern Ocean",
"oceanography",
"MPI-M > Max Planck Institute for Meteorology",
"Various",
"Ocean Carbon and Acidification Data System (OCADS) Project",
"EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON",
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"DIC",
"DIC_err",
"depth",
"lat",
"lon",
"month",
"CO2 ANALYZERS > CO2 ANALYZERS",
"OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN",
"OCEAN > ATLANTIC OCEAN > SOUTH ATLANTIC OCEAN",
"OCEAN > INDIAN OCEAN",
"OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN",
"OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN",
"OCEAN > SOUTHERN OCEAN",
"Arctic Ocean",
"Atlantic Ocean",
"Indian Ocean",
"Pacific Ocean",
"Southern Ocean"
]
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| language |
[]
|
| license | https://creativecommons.org/publicdomain/zero/1.0/ |
| modified | 2020-11-06T00:00:00.000+00:00 |
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|
| rights | otherRestrictions |
| spatial | 179.5,-64.5,-179.5,64.5 |
| temporal | 2004-01-01T00:00:00+00:00/2017-12-01T00:00:00+00:00 |
| title | Mapped Observation-Based Oceanic Dissolved Inorganic Carbon (DIC), monthly climatology from January to December (based on observations between 2004 and 2017), from the Max-Planck-Institute for Meteorology (MOBO-DIC_MPIM) (NCEI Accession 0221526) |
