Abstract: As global climate governance enters a critical phase, blue carbon, as a key carrier for carbon sequestration and emission reduction in coastal and marine ecosystems, the intelligent development of its trading system has become an important pathway for the Northeast Asian region to achieve carbon neutrality goals. Northeast Asia is endowed with abundant blue carbon resources such as salt marshes, mangroves, and seagrass beds; however, its trading system still faces multiple challenges, including insufficient accuracy of carbon sink accounting, inconsistent calculation standards, and the lack of data sharing mechanisms. Digital twin technology, with its capabilities of multi-source data fusion, dynamic simulation, and cross-domain collaborative management, provides strong technical support for addressing the aforementioned issues. Based on the practical needs of the intelligent development of blue carbon trading in Northeast Asia, this paper systematically sorts out the regional blue carbon resource endowments and the current status of trading development, and deeply analyzes the enabling mechanisms of digital twin technology in three core links: intelligent carbon sink accounting, trading process optimization, and cross-regional collaborative governance. It identifies five practical dilemmas, namely the regional heterogeneity of accounting standards, constraints of technology application costs and thresholds, imperfect market mechanisms, lack of cross-regional collaborative governance, and insufficient data quality and sharing. Furthermore, from five dimensions—standard coordination, technological coordination, subject coordination, market coordination, and governance coordination—a systematic collaborative pathway for digital twin technology to empower blue carbon trading in Northeast Asia is constructed. This study aims to provide theoretical basis and practical reference for building an efficient, transparent, and collaborative blue carbon trading system in Northeast Asia, while expanding the large-scale application paradigm of digital twin technology in the field of ecological carbon sinks.

Key words: digital twin, East Asia, blue carbon trading, carbon sink accounting, collaborative governance