Zhaokai Xu , Qingchao Fan , Haowen Dang , Shiming Wan , Christophe Colin , Jiawang Wu , Dhongil Lim , Tiegang Li
{"title":"西赤道太平洋第四纪铁施肥动态的洞察:巴布亚新几内亚北部近海的代理档案","authors":"Zhaokai Xu , Qingchao Fan , Haowen Dang , Shiming Wan , Christophe Colin , Jiawang Wu , Dhongil Lim , Tiegang Li","doi":"10.1016/j.gloplacha.2025.104952","DOIUrl":null,"url":null,"abstract":"<div><div>The equatorial Pacific is a key oceanographic region for unraveling Earth's climate system dynamics, where nutrient availability (e.g., iron, nitrogen, and phosphorus) plays a crucial role, at least partially, in governing the biologic pump and sea-air carbon exchange. Despite this, provenance, routing, and depositional processes, together with fertilization effects of nutrient supply to the western equatorial Pacific during the Quaternary, with Papua New Guinea potentially acting as a major iron contributor, remain elusive. Here, we present a comprehensive analysis of proxy archives for island erosion and weathering, terrestrial matter supply, surface ocean productivity, downward export of biogenic material, and bottom-water redox, all closely linked to orbital variations of iron fertilization, along the continental slope offshore of northern Papua New Guinea since 275 kyr. Our findings reveal a prominent precession cycle across these integrated records, aligning with changes in January–March insolation at 5°S. The observed temporal coupling indicates that heightened precipitation and erosion in northern Papua New Guinea stimulated nutrient input, thereby enhancing surface ocean fertilization, biologic production, and particulate carbon burial in the western equatorial Pacific during periods of high January–March insolation at 5°S. This caused the area to be a significant atmospheric CO<sub>2</sub> sink during La Niña-like conditions. We propose that enhanced erosion in northern Papua New Guinea led to increased iron fertilization in the western equatorial Pacific. Ongoing iron fertilization may significantly mitigate anthropogenic global warming by enhancing atmospheric CO<sub>2</sub> sequestration associated with increased occurrences of future consecutive La Niña events, as predicted by model simulations.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104952"},"PeriodicalIF":4.0000,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Insights into Quaternary iron fertilization dynamics in the western equatorial Pacific: Proxy archives offshore of northern Papua New Guinea\",\"authors\":\"Zhaokai Xu , Qingchao Fan , Haowen Dang , Shiming Wan , Christophe Colin , Jiawang Wu , Dhongil Lim , Tiegang Li\",\"doi\":\"10.1016/j.gloplacha.2025.104952\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The equatorial Pacific is a key oceanographic region for unraveling Earth's climate system dynamics, where nutrient availability (e.g., iron, nitrogen, and phosphorus) plays a crucial role, at least partially, in governing the biologic pump and sea-air carbon exchange. Despite this, provenance, routing, and depositional processes, together with fertilization effects of nutrient supply to the western equatorial Pacific during the Quaternary, with Papua New Guinea potentially acting as a major iron contributor, remain elusive. Here, we present a comprehensive analysis of proxy archives for island erosion and weathering, terrestrial matter supply, surface ocean productivity, downward export of biogenic material, and bottom-water redox, all closely linked to orbital variations of iron fertilization, along the continental slope offshore of northern Papua New Guinea since 275 kyr. Our findings reveal a prominent precession cycle across these integrated records, aligning with changes in January–March insolation at 5°S. The observed temporal coupling indicates that heightened precipitation and erosion in northern Papua New Guinea stimulated nutrient input, thereby enhancing surface ocean fertilization, biologic production, and particulate carbon burial in the western equatorial Pacific during periods of high January–March insolation at 5°S. This caused the area to be a significant atmospheric CO<sub>2</sub> sink during La Niña-like conditions. We propose that enhanced erosion in northern Papua New Guinea led to increased iron fertilization in the western equatorial Pacific. Ongoing iron fertilization may significantly mitigate anthropogenic global warming by enhancing atmospheric CO<sub>2</sub> sequestration associated with increased occurrences of future consecutive La Niña events, as predicted by model simulations.</div></div>\",\"PeriodicalId\":55089,\"journal\":{\"name\":\"Global and Planetary Change\",\"volume\":\"253 \",\"pages\":\"Article 104952\"},\"PeriodicalIF\":4.0000,\"publicationDate\":\"2025-06-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Global and Planetary Change\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0921818125002619\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOGRAPHY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Global and Planetary Change","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921818125002619","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOGRAPHY, PHYSICAL","Score":null,"Total":0}
Insights into Quaternary iron fertilization dynamics in the western equatorial Pacific: Proxy archives offshore of northern Papua New Guinea
The equatorial Pacific is a key oceanographic region for unraveling Earth's climate system dynamics, where nutrient availability (e.g., iron, nitrogen, and phosphorus) plays a crucial role, at least partially, in governing the biologic pump and sea-air carbon exchange. Despite this, provenance, routing, and depositional processes, together with fertilization effects of nutrient supply to the western equatorial Pacific during the Quaternary, with Papua New Guinea potentially acting as a major iron contributor, remain elusive. Here, we present a comprehensive analysis of proxy archives for island erosion and weathering, terrestrial matter supply, surface ocean productivity, downward export of biogenic material, and bottom-water redox, all closely linked to orbital variations of iron fertilization, along the continental slope offshore of northern Papua New Guinea since 275 kyr. Our findings reveal a prominent precession cycle across these integrated records, aligning with changes in January–March insolation at 5°S. The observed temporal coupling indicates that heightened precipitation and erosion in northern Papua New Guinea stimulated nutrient input, thereby enhancing surface ocean fertilization, biologic production, and particulate carbon burial in the western equatorial Pacific during periods of high January–March insolation at 5°S. This caused the area to be a significant atmospheric CO2 sink during La Niña-like conditions. We propose that enhanced erosion in northern Papua New Guinea led to increased iron fertilization in the western equatorial Pacific. Ongoing iron fertilization may significantly mitigate anthropogenic global warming by enhancing atmospheric CO2 sequestration associated with increased occurrences of future consecutive La Niña events, as predicted by model simulations.
期刊介绍:
The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems.
Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged.
Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.