{"id":114752,"date":"2026-09-11T15:08:59","date_gmt":"2026-09-11T13:08:59","guid":{"rendered":"https:\/\/nilu.gnist.dev\/publikasjoner\/global-methane-emission-estimates-from-a-dual-isotope-inversion-new-constraints-from-%ce%b4d-ch4\/"},"modified":"2026-09-11T15:08:59","modified_gmt":"2026-09-11T13:08:59","slug":"global-methane-emission-estimates-from-a-dual-isotope-inversion-new-constraints-from-%ce%b4d-ch4","status":"publish","type":"nva_publication","link":"https:\/\/nilu.gnist.dev\/en\/publications\/global-methane-emission-estimates-from-a-dual-isotope-inversion-new-constraints-from-%ce%b4d-ch4\/","title":{"rendered":"Global methane emission estimates from a dual-isotope inversion: new constraints from \u03b4D-CH4"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Methane (CH4) is a potent greenhouse gas; however, the causes of its growth since 2006 are a subject of debate. While measurements of CH4 mole fraction and carbon isotopic composition (\u03b413C-CH4) have been extensively used to investigate the global CH4 budget, the hydrogen isotopic composition (\u03b4D-CH4) remains underutilised despite its unique sensitivity to source types and oxidation processes. Here, we assimilate a newly harmonised 35-year dataset of dual isotope measurements from high-latitude monitoring stations in both hemispheres within a two-box Bayesian inversion to quantify global CH4 sources and sinks. The model integrates prior emissions from five source categories based on global bottom-up inventories. Methane removal processes are represented by sink-specific kinetic isotope effects as tropospheric and stratospheric loss, and soil uptake. We find that the inclusion of \u03b4D-CH4 improves the model&#8217;s ability to constrain emission apportionment between biogenic and thermogenic sources, particularly for fossil fuel emissions during the late 1990s and early 2000s, which affects CH4 lifetime estimate. CH4 increase post-2006 is driven mainly by rising wetland emissions, while fossil-fuel growth is modest, biomass burning declines, and agriculture and waste make smaller, regionalised contributions. The optimised inversion results favour a strong 13C kinetic isotope effect in total tropospheric CH4 removal and a net shortening of the NH lifetime of CH4 by 0.2\u00a0years. This study demonstrates the added value of incorporating \u03b4D-CH4 into inverse modelling frameworks and underscores the importance of long-term \u03b4D-CH4 measurements for advancing our understanding of CH4 biogeochemistry and its role in the global carbon cycle.<\/p>\n","protected":false},"template":"","meta":{"_acf_changed":false,"_searchwp_excluded":"","_id":"","_status":"PUBLISHED","_sync_date":"2026-09-11 13:55:48","footnotes":""},"nva_tax_category":[1099],"class_list":["post-114752","nva_publication","type-nva_publication","status-publish","hentry","nva_tax_category-scientific-journal-publication"],"acf":[],"_links":{"self":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/114752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication"}],"about":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/types\/nva_publication"}],"version-history":[{"count":0,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/114752\/revisions"}],"wp:attachment":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/media?parent=114752"}],"wp:term":[{"taxonomy":"nva_tax_category","embeddable":true,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_tax_category?post=114752"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}