粉尘对全球碳循环与气候有何影响？我国科研团队揭示奥秘

Core Insights - An international research team led by researchers from the Chinese Academy of Sciences has conducted a comprehensive review of the impact of dust on global carbon cycles and climate, revealing the evolution of dust flux, mineral composition, and key nutrient elements in major dust source regions [1][3] - The study highlights the critical role of dust cycles in global biogeochemical cycles and climate change, and identifies future research directions in this field [1][3] Summary by Categories Dust Flux and Composition - Over 4 billion tons of dust are released from land globally each year, primarily from arid and semi-arid regions, carrying essential nutrients like iron and phosphorus to the oceans [3] - The research emphasizes the need for a systematic understanding of the complete chain from dust sources to evolution and biological effects, which is currently a bottleneck in accurately assessing dust's climate effects [3] Impact on Marine Ecosystems - Dust plays a key role in enhancing marine primary productivity through a "fertilization effect," which helps sequester significant amounts of carbon dioxide from the atmosphere into the deep sea [3] - The study indicates that global warming may reduce glacier-derived dust, potentially weakening its fertilization effect on ocean productivity [3] Future Research Directions - Future research should focus on three core areas: 1. Integrating modern observations, algal cultivation experiments, and multi-indicator paleoclimate reconstructions to quantify nutrient components and their bioavailability from major dust source regions [3] 2. Establishing quantitative links between dust input and ocean carbon sinks in key areas like the North Pacific using geochemical indicators [3] 3. Developing regional parameterization schemes that incorporate dust composition and biological feedback processes into Earth system models to enhance simulations and predictions of the "dust-carbon cycle-climate feedback mechanisms" [3]