Investigating the Spatio-temporal Variation of Sea Surface pCO2 in the Baltic Sea with Remote Sensing
Abstract
Oceans uptake a significant share (~25%) of the anthropogenic CO2 emitted to the atmosphere and thus play a fundamental role in the global CO2 cycle. Remote Sensing has shown great potentials in assisting understanding the oceanic processing in a large scale. The Baltic Sea is a marginal sea of high latitude. As a semi-closed brackish sea receiving substantial complex terrestrial input, the Baltic Sea present unique characteristics in global CO2 air-sea exchange and yet insufficiently investigated or understood. In this study we aim to retrieve the sea surface pCO2 in the Baltic Sea from remote sensing data for the period from 2002 to 2016 and understand the intra- and inter- annual evolution of pCO2 in the entire Baltic Sea. Remote sensing products of biological and physical properties of the sea surface including sea surface temperature (SST) and Chlorophyll (Chl-a) serve as input in the pCO2 retrieval. Robust machine learning approaches (e.g. Random Forest) will be adapted and employed to retrieve sea surface pCO2. The pCO2 measurements obtained from vessels matching the remote sensing satellite overpasses in the corresponding years are alternatively employed as training and validation data. The mooring measurements of pCO2 from 2005 are used to validate the retrieved pCO2 maps. This study will present the spatio-temporal evolution characteristics of sea surface pCO2 in the Baltic Sea. The output of this study has great potential for helping further understand the air-sea CO2 exchange and the oceanic processes in the complex Baltic Sea. Based on the currently available remote sensing products, the study will pave the road for future continuation of sea surface pCO2 fluxes in the Baltic Sea with next generation of ocean observation satellites e.g. Sentinel-3.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMOS31B..09Z
- Keywords:
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- 4813 Ecological prediction;
- OCEANOGRAPHY: BIOLOGICAL;
- 4815 Ecosystems;
- structure;
- dynamics;
- and modeling;
- OCEANOGRAPHY: BIOLOGICAL;
- 4264 Ocean optics;
- OCEANOGRAPHY: GENERAL;
- 4556 Sea level: variations and mean;
- OCEANOGRAPHY: PHYSICAL