研究目的
Quantitatively estimate aboveground carbon (ABC) changes in the tropical region during 2010-2017 using the SMOS-IC L-VOD product.
研究成果
The study concludes that the tropical regions acted as a net carbon source of 111 Tg C yr-1 during 2010-2016, with significant declines in ABC observed in eastern America, African drylands, and Indonesia. These findings highlight the potential of SMOS-IC L-VOD for monitoring ABC changes in tropical regions.
研究不足
The study's limitations include the reliance on the Baccini map for calibration, which may not fully capture the dynamic changes in AGB over the study period. Additionally, the spatial resolution of the SMOS-IC L-VOD product (25 km) may not detect fine-scale changes in ABC.
1：Experimental Design and Method Selection:
The study utilized the SMOS-IC L-VOD product derived from L-band passive microwave observations to estimate ABC changes. The methodology involved filtering out pixels affected by strong topography, frozen surface, strong RFI, and waterbody or urban areas using Scene Flags and TB-RMSE.
2：Sample Selection and Data Sources:
The study focused on tropical regions, using the Baccini map as a benchmark to calibrate the relationship between AGB and L-VOD.
3：List of Experimental Equipment and Materials:
The primary data source was the SMOS satellite's L-band passive microwave observations.
4：Experimental Procedures and Operational Workflow:
The relationship between ABC and L-VOD was computed using a calibrated equation based on the Baccini AGB map.
5：Data Analysis Methods:
The analysis involved converting VOD-retrieved AGB into ABC by applying a factor of 0.5 and assessing changes over the tropical regions.
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