{"id":92474,"date":"2026-06-29T14:36:49","date_gmt":"2026-06-29T12:36:49","guid":{"rendered":""},"modified":"2026-06-29T14:46:30","modified_gmt":"2026-06-29T12:46:30","slug":"0198cc3f0d3f-e932f5c8-e8c4-468d-9244-7687634cf503","status":"publish","type":"nva_publication","link":"https:\/\/nilu.gnist.dev\/en\/publications\/0198cc3f0d3f-e932f5c8-e8c4-468d-9244-7687634cf503\/","title":{"rendered":"Source regions of some persistent organic pollutants measured in the atmosphere at Birkenes, Norway"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A key feature of POPs (Persistent Organic Pollutants)<br \/>\nis their potential for long-range atmospheric transport.<br \/>\nIn order to better understand and predict atmospheric source-receptor relationships of POPs, we have modified an existing Lagrangian transport model (FLEXPART) to include some of the key processes that control the atmospheric fate of POPs.<br \/>\nWe also present four years (2004\u20132007) of new atmospheric<br \/>\nmeasurement data for polychlorinated biphenyls (PCBs) and<br \/>\nhexachlorocyclohexanes (HCHs) obtained at Birkenes, an<br \/>\nEMEP (European Monitoring and Evaluation Programme)<br \/>\nsite in southern Norway. The model overestimates measured<br \/>\nPCB-28 and g-HCH concentrations by factors of 2 and 8, respectively, which is most likely because the emissions used as input to the model are overestimated. FLEXPART captures the temporal variability in the measurements very well and, depending on season, explains 31\u201367% (14\u201362%) of<br \/>\nthe variance of measured PCB-28 (g-HCH) concentrations.<br \/>\nFLEXPART, run in a time-reversed (adjoint) mode, was used<br \/>\nto identify the source regions responsible for the POP loading at the Birkenes station. Emissions in Central Europe and Eastern Europe contributed 32% and 24%, respectively, to PCB-28 at Birkenes, while Western Europe was found to be the dominant source (50%) for g-HCH. Intercontinental transport from North America contributed 13% for g-HCH.<br \/>\nWhile FLEXPART has no treatment of the partitioning of<br \/>\nPOPs between different surface media, it was found a very<br \/>\nuseful tool for studying atmospheric source-receptor relationships for POPs and POP-like chemicals that do not sorb strongly to atmospheric particles and whose atmospheric levels are believed to be mainly controlled by primary sources.<\/p>\n","protected":false},"template":"","meta":{"_acf_changed":false,"_searchwp_excluded":"","_id":"","_status":"PUBLISHED","_sync_date":"2026-06-29 14:36:49","footnotes":""},"nva_tax_category":[1059],"class_list":["post-92474","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\/92474","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":1,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/92474\/revisions"}],"predecessor-version":[{"id":92475,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/92474\/revisions\/92475"}],"wp:attachment":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/media?parent=92474"}],"wp:term":[{"taxonomy":"nva_tax_category","embeddable":true,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_tax_category?post=92474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}