{"title":"如果不考虑水和大气中二氧化碳的日变化,就会高估河流的二氧化碳排放量","authors":"Theresa Reichenpfader, Katrin Attermeyer","doi":"10.1002/lol2.10405","DOIUrl":null,"url":null,"abstract":"<p>Streams are significant emitters of carbon dioxide (CO<sub>2</sub>) to the atmosphere that are influenced by diel CO<sub>2</sub> dynamics. However, we know little about diel CO<sub>2</sub> variability within streams, the diel dynamics of CO<sub>2</sub> in the air above streams, and the consequences for emission calculations. We studied five pre-alpine streams by equipping three sites per stream in close proximity (~ 1 km apart) with automatic logging stations that continuously recorded water and air CO<sub>2</sub> partial pressures (pCO<sub>2</sub>) for 2–4 d. All streams and sites showed increased pCO<sub>2</sub> at night and decreased pCO<sub>2</sub> during the day, however, with fourfold higher diel amplitudes for atmospheric pCO<sub>2</sub> compared to the water. Calculating diffusive CO<sub>2</sub> fluxes with fixed compared to dynamic measured atmospheric CO<sub>2</sub> resulted in negligible to 431% lower estimates. We might thus currently overestimate fluvial CO<sub>2</sub> emissions and should include diel water and air CO<sub>2</sub> variability to more accurately assess stream CO<sub>2</sub> emissions.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10405","citationCount":"0","resultStr":"{\"title\":\"Stream CO2 emissions are overestimated without consideration of diel water and atmospheric CO2 variability\",\"authors\":\"Theresa Reichenpfader, Katrin Attermeyer\",\"doi\":\"10.1002/lol2.10405\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Streams are significant emitters of carbon dioxide (CO<sub>2</sub>) to the atmosphere that are influenced by diel CO<sub>2</sub> dynamics. However, we know little about diel CO<sub>2</sub> variability within streams, the diel dynamics of CO<sub>2</sub> in the air above streams, and the consequences for emission calculations. We studied five pre-alpine streams by equipping three sites per stream in close proximity (~ 1 km apart) with automatic logging stations that continuously recorded water and air CO<sub>2</sub> partial pressures (pCO<sub>2</sub>) for 2–4 d. All streams and sites showed increased pCO<sub>2</sub> at night and decreased pCO<sub>2</sub> during the day, however, with fourfold higher diel amplitudes for atmospheric pCO<sub>2</sub> compared to the water. Calculating diffusive CO<sub>2</sub> fluxes with fixed compared to dynamic measured atmospheric CO<sub>2</sub> resulted in negligible to 431% lower estimates. We might thus currently overestimate fluvial CO<sub>2</sub> emissions and should include diel water and air CO<sub>2</sub> variability to more accurately assess stream CO<sub>2</sub> emissions.</p>\",\"PeriodicalId\":18128,\"journal\":{\"name\":\"Limnology and Oceanography Letters\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-05-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10405\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Limnology and Oceanography Letters\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/lol2.10405\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"LIMNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Limnology and Oceanography Letters","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/lol2.10405","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"LIMNOLOGY","Score":null,"Total":0}
Stream CO2 emissions are overestimated without consideration of diel water and atmospheric CO2 variability
Streams are significant emitters of carbon dioxide (CO2) to the atmosphere that are influenced by diel CO2 dynamics. However, we know little about diel CO2 variability within streams, the diel dynamics of CO2 in the air above streams, and the consequences for emission calculations. We studied five pre-alpine streams by equipping three sites per stream in close proximity (~ 1 km apart) with automatic logging stations that continuously recorded water and air CO2 partial pressures (pCO2) for 2–4 d. All streams and sites showed increased pCO2 at night and decreased pCO2 during the day, however, with fourfold higher diel amplitudes for atmospheric pCO2 compared to the water. Calculating diffusive CO2 fluxes with fixed compared to dynamic measured atmospheric CO2 resulted in negligible to 431% lower estimates. We might thus currently overestimate fluvial CO2 emissions and should include diel water and air CO2 variability to more accurately assess stream CO2 emissions.
期刊介绍:
Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.