The budget calculation includes two modules: air-sea CO2 flux, and carbon budget for the area integral of flux products (Figure 2-69).
Figure 2‑69. Budget calculation tabs.
2.7.1 Air-sea CO2 flux
Air-sea CO2 includes three sub-modules: “Air-sea CO2 based on satellite data,” “Air-sea CO2 based on user-defined data,” and “Air-sea CO2 based on in-situ data.”
Air-sea CO2 flux of satellite data calculation: click the button, and dialog box will pop up (Figure 2-70). Choose interested time period for the query. The database can automatically search the database for related satellite parameters (sea surface temperature, salinity, sea surface wind speed, atmospheric partial pressure of CO2, and the sea partial pressure of CO2).
If the database lacks satellite data of a certain parameter, it cannot carry out follow-up flux calculation. If there are multiple satellite products in the database for the same parameter, you can select one product in the drop-down menu for calculation. Then, set the calculation formula of gas transfer velocity to determine whether C2 wind speed correction is required, and click “OK” to start calculating flux.
By default, the software resamples various spatial resolutions to the highest resolution of the selected data. Users can choose to resample to any resolution for their calculation. Results automatically displayed on 3D geosphere, as shown in Figure 2-71.
Figure 2‑70. Air-sea CO2 flux calculation from satellite data.
Figure 2‑71. Air-sea CO2 flux calculating results.
User-defined calculation: different from the previous module, this module can customize input parameters (sea surface temperature, salinity, sea surface wind speed, atmospheric partial pressure of CO2, and the sea partial pressure of CO2). These data need to be imported through the “load data” menu and loaded in the 3D geosphere in advance, and then can be confirmed by the drop-down menu for selection.
Click “Air-sea CO2 based on user-defined data” button, and the calculation dialog box will pop up (Figure 2-72). Select the satellite data corresponding to the flux calculation parameters, which have been loaded. Set the calculation formula of gas transfer velocity and whether C2 wind speed correction is required. Click “OK” to start flux calculation. By default, the software resamples various spatial resolutions to the highest resolution of the calculated data. Users can choose to resample to any resolution for calculation. Calculation results will be automatically displayed on the 3D geosphere.
Figure 2‑72. Air-sea CO2 flux based on user-defined data.
In-situ data calculation: the flux calculation based on in situ data is similar to the satellite flux calculation. Users load parameters from an online database or local in situ data. If some parameters are missing in the in situ data, the software can provide the temporal-spatial matching satellite data instead (Figure 2-73). For locally loaded in situ data, users need to select the corresponding in situ parameters to match. In addition, users can manually input constant atmospheric partial pressure of CO2 or constant sea surface wind value for the calculation.
Figure 2‑73. Air-sea CO2 flux based on in-situ data.
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