Matthias Fuchs , Miriam C. Jones , Evan J. Gowan , Steve Frolking , Katey Walter Anthony , Guido Grosse , Benjamin M. Jones , Jonathan A. O'Donnell , Laura Brosius , Claire Treat
{"title":"过去两万年间白令海沿岸湿地的甲烷通量","authors":"Matthias Fuchs , Miriam C. Jones , Evan J. Gowan , Steve Frolking , Katey Walter Anthony , Guido Grosse , Benjamin M. Jones , Jonathan A. O'Donnell , Laura Brosius , Claire Treat","doi":"10.1016/j.quascirev.2024.108976","DOIUrl":null,"url":null,"abstract":"<div><div>Atmospheric methane (CH<sub>4</sub>) concentrations have gone through rapid changes since the last deglaciation; however, the reasons for abrupt increases around 14,700 and 11,600 years before present (yrs BP) are not fully understood. Concurrent with deglaciation, sea-level rise gradually inundated vast areas of the low-lying Beringian shelf. This transformation of what was once a terrestrial-permafrost tundra-steppe landscape, into coastal, and subsequently, marine environments led to new sources of CH<sub>4</sub> from the region to the atmosphere. Here, we estimate, based on an extended geospatial analysis, the area of Beringian coastal wetlands in 1000-year intervals and their potential contribution to northern CH<sub>4</sub> flux (based on present day CH<sub>4</sub> fluxes from coastal wetland) during the past 20,000 years. At its maximum (∼14,000 yrs BP) we estimated CH<sub>4</sub> fluxes from Beringia coastal wetlands to be 3.5 (+4.0/-1.9) Tg CH<sub>4</sub> yr<sup>−1</sup>. This shifts the onset of CH<sub>4</sub> fluxes from northern regions earlier, towards the Bølling-Allerød, preceding peak emissions from the formation of northern high latitude thermokarst lakes and wetlands. Emissions associated with the inundation of Beringian coastal wetlands better align with polar ice core reconstructions of northern hemisphere sources of atmospheric CH<sub>4</sub> during the last deglaciation, suggesting a connection between rising sea level, coastal wetland expansion, and enhanced CH<sub>4</sub> emissions.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108976"},"PeriodicalIF":3.2000,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Methane flux from Beringian coastal wetlands for the past 20,000 years\",\"authors\":\"Matthias Fuchs , Miriam C. Jones , Evan J. Gowan , Steve Frolking , Katey Walter Anthony , Guido Grosse , Benjamin M. Jones , Jonathan A. O'Donnell , Laura Brosius , Claire Treat\",\"doi\":\"10.1016/j.quascirev.2024.108976\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Atmospheric methane (CH<sub>4</sub>) concentrations have gone through rapid changes since the last deglaciation; however, the reasons for abrupt increases around 14,700 and 11,600 years before present (yrs BP) are not fully understood. Concurrent with deglaciation, sea-level rise gradually inundated vast areas of the low-lying Beringian shelf. This transformation of what was once a terrestrial-permafrost tundra-steppe landscape, into coastal, and subsequently, marine environments led to new sources of CH<sub>4</sub> from the region to the atmosphere. Here, we estimate, based on an extended geospatial analysis, the area of Beringian coastal wetlands in 1000-year intervals and their potential contribution to northern CH<sub>4</sub> flux (based on present day CH<sub>4</sub> fluxes from coastal wetland) during the past 20,000 years. At its maximum (∼14,000 yrs BP) we estimated CH<sub>4</sub> fluxes from Beringia coastal wetlands to be 3.5 (+4.0/-1.9) Tg CH<sub>4</sub> yr<sup>−1</sup>. This shifts the onset of CH<sub>4</sub> fluxes from northern regions earlier, towards the Bølling-Allerød, preceding peak emissions from the formation of northern high latitude thermokarst lakes and wetlands. Emissions associated with the inundation of Beringian coastal wetlands better align with polar ice core reconstructions of northern hemisphere sources of atmospheric CH<sub>4</sub> during the last deglaciation, suggesting a connection between rising sea level, coastal wetland expansion, and enhanced CH<sub>4</sub> emissions.</div></div>\",\"PeriodicalId\":20926,\"journal\":{\"name\":\"Quaternary Science Reviews\",\"volume\":\"344 \",\"pages\":\"Article 108976\"},\"PeriodicalIF\":3.2000,\"publicationDate\":\"2024-09-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Quaternary Science Reviews\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0277379124004773\",\"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":"Quaternary Science Reviews","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0277379124004773","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}
Methane flux from Beringian coastal wetlands for the past 20,000 years
Atmospheric methane (CH4) concentrations have gone through rapid changes since the last deglaciation; however, the reasons for abrupt increases around 14,700 and 11,600 years before present (yrs BP) are not fully understood. Concurrent with deglaciation, sea-level rise gradually inundated vast areas of the low-lying Beringian shelf. This transformation of what was once a terrestrial-permafrost tundra-steppe landscape, into coastal, and subsequently, marine environments led to new sources of CH4 from the region to the atmosphere. Here, we estimate, based on an extended geospatial analysis, the area of Beringian coastal wetlands in 1000-year intervals and their potential contribution to northern CH4 flux (based on present day CH4 fluxes from coastal wetland) during the past 20,000 years. At its maximum (∼14,000 yrs BP) we estimated CH4 fluxes from Beringia coastal wetlands to be 3.5 (+4.0/-1.9) Tg CH4 yr−1. This shifts the onset of CH4 fluxes from northern regions earlier, towards the Bølling-Allerød, preceding peak emissions from the formation of northern high latitude thermokarst lakes and wetlands. Emissions associated with the inundation of Beringian coastal wetlands better align with polar ice core reconstructions of northern hemisphere sources of atmospheric CH4 during the last deglaciation, suggesting a connection between rising sea level, coastal wetland expansion, and enhanced CH4 emissions.
期刊介绍:
Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.