Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes
The northern high latitudes (50–90° N, mostly including boreal-forest and tundra ecosystems) have been undergoing rapid climate and ecological changes over recent decades, leading to significant variations in volatile organic compounds (VOC) emissions from biogenic and biomass burning sources. Forma...
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ftdoajarticles:oai:doaj.org/article:f8088357221b4adba07ea89b3fffc667 2024-09-15T18:39:53+00:00 Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes T. Zhao J. Mao Z. Ayazpour G. González Abad C. R. Nowlan Y. Zheng 2024-05-01T00:00:00Z https://doi.org/10.5194/acp-24-6105-2024 https://doaj.org/article/f8088357221b4adba07ea89b3fffc667 EN eng Copernicus Publications https://acp.copernicus.org/articles/24/6105/2024/acp-24-6105-2024.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-24-6105-2024 1680-7316 1680-7324 https://doaj.org/article/f8088357221b4adba07ea89b3fffc667 Atmospheric Chemistry and Physics, Vol 24, Pp 6105-6121 (2024) Physics QC1-999 Chemistry QD1-999 article 2024 ftdoajarticles https://doi.org/10.5194/acp-24-6105-2024 2024-08-05T17:49:19Z The northern high latitudes (50–90° N, mostly including boreal-forest and tundra ecosystems) have been undergoing rapid climate and ecological changes over recent decades, leading to significant variations in volatile organic compounds (VOC) emissions from biogenic and biomass burning sources. Formaldehyde (HCHO) is an indicator of VOC emissions, but the interannual variability of HCHO and its main drivers over the region remains unclear. In this study, we use the GEOS-Chem chemical transport model and satellite retrievals from the Ozone Monitoring Instrument (OMI) and the Ozone Mapping and Profiler Suite (OMPS) to examine the interannual variability of HCHO vertical column density (VCD) during the summer seasons spanning from 2005 to 2019. Our results show that, in 2005–2019 summers, wildfires contributed 75 %–90 % of the interannual variability of HCHO VCD over Siberia, Alaska and northern Canada, while biogenic emissions and background methane oxidation account for ∼ 90 % of HCHO interannual variability over eastern Europe. We find that monthly solar-induced chlorophyll fluorescence (SIF) from the Orbiting Carbon Observatory-2 (OCO-2), an efficient proxy for plant photosynthesis, shows a good linear relationship ( R = 0.6–0.7) with the modeled biogenic HCHO column (dVCD Bio,GC ) in eastern Europe, Siberia, Alaska and northern Canada, indicating the coupling between SIF and biogenic VOC emissions over the four domains on a monthly scale. In Alaska, Siberia and northern Canada, SIF and dVCD Bio,GC both show relatively lower interannual variabilities (SIF: CV = 1 %–9 %, dVCD Bio,GC : CV = 1 %–2 %; note that CV stands for coefficient of variation) in comparison to wildfire-induced HCHO (CV = 8 %–13 %), suggesting that the high interannual variabilities of OMI HCHO VCD (CV = 10 %–16 %) in these domains are likely driven by wildfires instead of biogenic emissions. Article in Journal/Newspaper Tundra Alaska Siberia Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 24 10 6105 6121 |
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English |
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Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 T. Zhao J. Mao Z. Ayazpour G. González Abad C. R. Nowlan Y. Zheng Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The northern high latitudes (50–90° N, mostly including boreal-forest and tundra ecosystems) have been undergoing rapid climate and ecological changes over recent decades, leading to significant variations in volatile organic compounds (VOC) emissions from biogenic and biomass burning sources. Formaldehyde (HCHO) is an indicator of VOC emissions, but the interannual variability of HCHO and its main drivers over the region remains unclear. In this study, we use the GEOS-Chem chemical transport model and satellite retrievals from the Ozone Monitoring Instrument (OMI) and the Ozone Mapping and Profiler Suite (OMPS) to examine the interannual variability of HCHO vertical column density (VCD) during the summer seasons spanning from 2005 to 2019. Our results show that, in 2005–2019 summers, wildfires contributed 75 %–90 % of the interannual variability of HCHO VCD over Siberia, Alaska and northern Canada, while biogenic emissions and background methane oxidation account for ∼ 90 % of HCHO interannual variability over eastern Europe. We find that monthly solar-induced chlorophyll fluorescence (SIF) from the Orbiting Carbon Observatory-2 (OCO-2), an efficient proxy for plant photosynthesis, shows a good linear relationship ( R = 0.6–0.7) with the modeled biogenic HCHO column (dVCD Bio,GC ) in eastern Europe, Siberia, Alaska and northern Canada, indicating the coupling between SIF and biogenic VOC emissions over the four domains on a monthly scale. In Alaska, Siberia and northern Canada, SIF and dVCD Bio,GC both show relatively lower interannual variabilities (SIF: CV = 1 %–9 %, dVCD Bio,GC : CV = 1 %–2 %; note that CV stands for coefficient of variation) in comparison to wildfire-induced HCHO (CV = 8 %–13 %), suggesting that the high interannual variabilities of OMI HCHO VCD (CV = 10 %–16 %) in these domains are likely driven by wildfires instead of biogenic emissions. |
format |
Article in Journal/Newspaper |
author |
T. Zhao J. Mao Z. Ayazpour G. González Abad C. R. Nowlan Y. Zheng |
author_facet |
T. Zhao J. Mao Z. Ayazpour G. González Abad C. R. Nowlan Y. Zheng |
author_sort |
T. Zhao |
title |
Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes |
title_short |
Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes |
title_full |
Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes |
title_fullStr |
Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes |
title_full_unstemmed |
Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes |
title_sort |
interannual variability of summertime formaldehyde (hcho) vertical column density and its main drivers at northern high latitudes |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/acp-24-6105-2024 https://doaj.org/article/f8088357221b4adba07ea89b3fffc667 |
genre |
Tundra Alaska Siberia |
genre_facet |
Tundra Alaska Siberia |
op_source |
Atmospheric Chemistry and Physics, Vol 24, Pp 6105-6121 (2024) |
op_relation |
https://acp.copernicus.org/articles/24/6105/2024/acp-24-6105-2024.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-24-6105-2024 1680-7316 1680-7324 https://doaj.org/article/f8088357221b4adba07ea89b3fffc667 |
op_doi |
https://doi.org/10.5194/acp-24-6105-2024 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
24 |
container_issue |
10 |
container_start_page |
6105 |
op_container_end_page |
6121 |
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1810484222429757440 |