2026-09-11 京都大学
海洋において炭素が隔離されるプロセスの概念図（図を生成AI（ChatGPT）にて生成し、著者にて改変）。
＜関連情報＞
- https://www.kyoto-u.ac.jp/ja/research-news/2026-09-11
- https://www.sciencedirect.com/science/article/pii/S2666765726000657
衛星データに基づく全懸濁物質を指標とした沿岸表面のブルーカーボン分布：日本の2つの湾における事例研究 Satellite-based total suspended matter as an indicator of coastal surface blue-carbon distribution: a case study of two bays in Japan
Takeshi Osawa, Narumasa Tsutsumida, Hideyuki Doi
Environmental Advances Available online: 10 August 2026
DOI:https://doi.org/10.1016/j.envadv.2026.100747
Highlight
- GCOM-C/SGLI-derived TSM was evaluated as a proxy for coastal blue carbon.
- TSM showed significant distance-decay patterns from river estuaries.
- Seagrass meadows exhibited significantly higher TSM than surrounding waters.
- TSM reflected spatial patterns of potential particulate organic matter sources.
- Satellite-derived TSM provides a scalable proxy for coastal blue-carbon monitoring.
Abstract
Coastal blue-carbon ecosystems, particularly seagrass meadows, play a disproportionate role in global carbon sequestration. However, the spatial distribution of exported particulate organic matter (POM) remains poorly understood at large spatial scales. Satellite remote sensing offers a promising approach for monitoring coastal carbon dynamics, yet most studies have focused on benthic seagrass distribution rather than suspended carbon in the water column. This study evaluated the potential of total suspended matter (TSM) estimated from Global Change Observation Mission-Climate (GCOM-C) observations as a proxy for coastal blue-carbon distribution. Using 250-m gridded data from Sagami Bay and Suruga Bay, Japan, we examined whether TSM reflected POM distribution by testing its relationships with distance from river estuaries and mapped seagrass meadows. TSM showed a significant negative relationship with distance from river estuaries in both bays, consistent with riverine POM inputs. TSM values were also significantly higher within seagrass meadows than in surrounding waters, suggesting that TSM reflects both seagrass-derived organic particles and suspended particles retained within seagrass meadows that may potentially be buried and sequestered. Although TSM integrates both autochthonous and allochthonous material, our results demonstrate that satellite-based TSM provides a feasible, scalable proxy for coastal blue-carbon distribution, supporting future large-scale monitoring and assessment of coastal blue carbon.
