{"id":{"repo_id":"ag-u-iceland","oai_identifier":"oai:skemman.is:1946/51644"},"canonical_url":"https://search.dev.ndltd.org/etd/ag-u-iceland/oai:skemman.is:1946/51644","repository":{"repo_id":"ag-u-iceland","name":"Agricultural University of Iceland","base_url":"https://skemman.is/oai/request"},"display":{"title":"Observing Seasonal Cycles in Greenhouse Gas Fluxes with Automatic Flushing Chambers in a Low-Arctic Lake","abstract":"The Arctic is warming nearly four times faster than the global average. Greenhouse gases (GHG) are causing a changing climate which is affecting permafrost thaw, sea ice melt, and changing hydrological dynamics. Lakes in the Arctic and sub-Arctic regions are increasingly recognised as important actors in the global carbon budget, acting as both sources and sinks of carbon dioxide (CO₂) and methane (CH₄). Despite their abundance, these lakes remain understudied due to harsh environmental conditions and logistical constraints. This study explores the use of low-cost, Automatic Flushing Chambers (AFCs) equipped with CH₄ and CO₂ sensors for continuous monitoring of GHG fluxes. Over the summer of 2024, four AFCs were deployed on Lake Badesø, located near Nuuk, Greenland, to measure fluxes during the ice-free season. The aims were to test the performance of low-cost sensors in Arctic environments and to evaluate the lake’s role in carbon cycling and assess how environmental drivers impact gas fluxes. Measurements showed that Lake Badesø functions as a consistent source of CO₂ throughout the sampling period. Methane emissions, on the other hand, were minimal across the lake system. Generalised Additive Mixed Models (GAMMs) and linear regression analyses revealed significant correlations between CO₂ fluxes and some environmental parameters. Specifically, freshwater discharge, was positively linked to CO₂ emission at all sampling locations. Methane concentrations were too low for accurate flux estimates using the low-cost CH₄ sensors, as the readings were dominated by humidity-related noise. Future work should include further sensor calibration and electronic nose strategies to improve CH₄ measurements at low concentrations.","abstract_html":"The Arctic is warming nearly four times faster than the global average. Greenhouse gases (GHG) are causing a changing climate which is affecting permafrost thaw, sea ice melt, and changing hydrological dynamics. Lakes in the Arctic and sub-Arctic regions are increasingly recognised as important actors in the global carbon budget, acting as both sources and sinks of carbon dioxide (CO₂) and methane (CH₄). Despite their abundance, these lakes remain understudied due to harsh environmental conditions and logistical constraints. This study explores the use of low-cost, Automatic Flushing Chambers (AFCs) equipped with CH₄ and CO₂ sensors for continuous monitoring of GHG fluxes. Over the summer of 2024, four AFCs were deployed on Lake Badesø, located near Nuuk, Greenland, to measure fluxes during the ice-free season. The aims were to test the performance of low-cost sensors in Arctic environments and to evaluate the lake’s role in carbon cycling and assess how environmental drivers impact gas fluxes. Measurements showed that Lake Badesø functions as a consistent source of CO₂ throughout the sampling period. Methane emissions, on the other hand, were minimal across the lake system. Generalised Additive Mixed Models (GAMMs) and linear regression analyses revealed significant correlations between CO₂ fluxes and some environmental parameters. Specifically, freshwater discharge, was positively linked to CO₂ emission at all sampling locations. Methane concentrations were too low for accurate flux estimates using the low-cost CH₄ sensors, as the readings were dominated by humidity-related noise. Future work should include further sensor calibration and electronic nose strategies to improve CH₄ measurements at low concentrations.","abstract_has_math":false,"creators":["Celeste Bergne 2001-"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Landbúnaðarháskóli Íslands"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-11-11T14:50:50Z","date_published":"2025-11-11T14:50:50Z","updated_at":"2026-07-27T18:42:25Z","subjects":["Umhverfisbreytingar á norðurslóðum","Carbon dioxide","Methane","Low-cost GHG sensors","Arctic Lake"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1946/51644","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Landbúnaðarháskóli Íslands"]},{"key":"dc:creator","label":"Author","values":["Celeste Bergne 2001-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-11-11T14:50:50Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-11-11T14:50:50Z"]},{"key":"dc:date.issued","label":"Date","values":["2025-11-11T14:50:50Z"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Umhverfisbreytingar á norðurslóðum","Carbon dioxide","Methane","Low-cost GHG sensors","Arctic Lake"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1946/51644"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The Arctic is warming nearly four times faster than the global average. Greenhouse gases (GHG) are causing a changing climate which is affecting permafrost thaw, sea ice melt, and changing hydrological dynamics. Lakes in the Arctic and sub-Arctic regions are increasingly recognised as important actors in the global carbon budget, acting as both sources and sinks of carbon dioxide (CO₂) and methane (CH₄). Despite their abundance, these lakes remain understudied due to harsh environmental conditions and logistical constraints. This study explores the use of low-cost, Automatic Flushing Chambers (AFCs) equipped with CH₄ and CO₂ sensors for continuous monitoring of GHG fluxes. Over the summer of 2024, four AFCs were deployed on Lake Badesø, located near Nuuk, Greenland, to measure fluxes during the ice-free season. The aims were to test the performance of low-cost sensors in Arctic environments and to evaluate the lake’s role in carbon cycling and assess how environmental drivers impact gas fluxes. Measurements showed that Lake Badesø functions as a consistent source of CO₂ throughout the sampling period. Methane emissions, on the other hand, were minimal across the lake system. Generalised Additive Mixed Models (GAMMs) and linear regression analyses revealed significant correlations between CO₂ fluxes and some environmental parameters. Specifically, freshwater discharge, was positively linked to CO₂ emission at all sampling locations. Methane concentrations were too low for accurate flux estimates using the low-cost CH₄ sensors, as the readings were dominated by humidity-related noise. Future work should include further sensor calibration and electronic nose strategies to improve CH₄ measurements at low concentrations."]},{"key":"dc:title","label":"Title","values":["Observing Seasonal Cycles in Greenhouse Gas Fluxes with Automatic Flushing Chambers in a Low-Arctic Lake"]}]}],"canonical_facts":{"dc:contributor":["Landbúnaðarháskóli Íslands"],"dc:creator":["Celeste Bergne 2001-"],"dc:date.accessioned":["2025-11-11T14:50:50Z"],"dc:date.available":["2025-11-11T14:50:50Z"],"dc:date.issued":["2025-11-11T14:50:50Z"],"dc:description.abstract":["The Arctic is warming nearly four times faster than the global average. Greenhouse gases (GHG) are causing a changing climate which is affecting permafrost thaw, sea ice melt, and changing hydrological dynamics. Lakes in the Arctic and sub-Arctic regions are increasingly recognised as important actors in the global carbon budget, acting as both sources and sinks of carbon dioxide (CO₂) and methane (CH₄). Despite their abundance, these lakes remain understudied due to harsh environmental conditions and logistical constraints. This study explores the use of low-cost, Automatic Flushing Chambers (AFCs) equipped with CH₄ and CO₂ sensors for continuous monitoring of GHG fluxes. Over the summer of 2024, four AFCs were deployed on Lake Badesø, located near Nuuk, Greenland, to measure fluxes during the ice-free season. The aims were to test the performance of low-cost sensors in Arctic environments and to evaluate the lake’s role in carbon cycling and assess how environmental drivers impact gas fluxes. Measurements showed that Lake Badesø functions as a consistent source of CO₂ throughout the sampling period. Methane emissions, on the other hand, were minimal across the lake system. Generalised Additive Mixed Models (GAMMs) and linear regression analyses revealed significant correlations between CO₂ fluxes and some environmental parameters. Specifically, freshwater discharge, was positively linked to CO₂ emission at all sampling locations. Methane concentrations were too low for accurate flux estimates using the low-cost CH₄ sensors, as the readings were dominated by humidity-related noise. Future work should include further sensor calibration and electronic nose strategies to improve CH₄ measurements at low concentrations."],"dc:identifier.uri":["https://hdl.handle.net/1946/51644"],"dc:language.iso":["en"],"dc:subject":["Umhverfisbreytingar á norðurslóðum","Carbon dioxide","Methane","Low-cost GHG sensors","Arctic Lake"],"dc:title":["Observing Seasonal Cycles in Greenhouse Gas Fluxes with Automatic Flushing Chambers in a Low-Arctic Lake"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T18:42:25Z"}