Cold oceans enhance terrestrial new-particle formation in near-coastal forests
The world's forests produce atmospheric aerosol by emitting volatile organic compounds (VOC) which, after being oxidized in the atmosphere, readily condense on the omnipresent nanometer-sized nuclei and grow them to climatically relevant sizes. The cooling effect of aerosols is the greatest unc...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2009
|
Subjects: | |
Online Access: | https://doaj.org/article/7679cb4fd5bd4978b36426514d8e3dd1 |
id |
ftdoajarticles:oai:doaj.org/article:7679cb4fd5bd4978b36426514d8e3dd1 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:7679cb4fd5bd4978b36426514d8e3dd1 2023-05-15T16:12:09+02:00 Cold oceans enhance terrestrial new-particle formation in near-coastal forests M. Kulmala S. Sevanto P. Briggs E. van Gorsel H. Cleugh T. Kurtén J. Bäck H. Hakola J. Lauros L. Sogacheva T. Suni 2009-11-01T00:00:00Z https://doaj.org/article/7679cb4fd5bd4978b36426514d8e3dd1 EN eng Copernicus Publications http://www.atmos-chem-phys.net/9/8639/2009/acp-9-8639-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/7679cb4fd5bd4978b36426514d8e3dd1 Atmospheric Chemistry and Physics, Vol 9, Iss 22, Pp 8639-8650 (2009) Physics QC1-999 Chemistry QD1-999 article 2009 ftdoajarticles 2022-12-30T21:54:45Z The world's forests produce atmospheric aerosol by emitting volatile organic compounds (VOC) which, after being oxidized in the atmosphere, readily condense on the omnipresent nanometer-sized nuclei and grow them to climatically relevant sizes. The cooling effect of aerosols is the greatest uncertainty in current climate models and estimates of radiative forcing. Therefore, identifying the environmental factors influencing the biogenic formation of aerosols is crucial. In this paper, we connected biogenic aerosol formation events observed in a Eucalypt forest in South-East Australia during July 2005–December 2006 to air mass history using 96-h back trajectories. Formation of new particles was most frequent in the dry westerly and south-westerly air masses. According to NDVI (Normalized Difference Vegetation Index) measurements, photosynthesis was not significantly higher in this direction compared to the north-east direction. It is unlikely, therefore, that differences in photosynthesis-derived organic precursor emissions would have been significant enough to lead to the clear difference in NPF frequency between these two directions. Instead, the high evaporation rates above the Pacific Ocean resulted in humid winds from the north-east that effectively suppressed new-particle formation in the forest hundreds of kilometers inland. No other factor varied as significantly in tune with new-particle formation as humidity and we concluded that, in addition to local meteorological factors in the forest, the magnitude of evaporation from oceans hundreds of kilometers upwind can effectively suppress or enhance new-particle formation. Our findings indicate that, unlike warm waters, the cold polar oceans provide excellent clean and dry background air that enhances aerosol formation above near-coastal forests in Fennoscandia and South-East Australia. Article in Journal/Newspaper Fennoscandia Directory of Open Access Journals: DOAJ Articles Pacific |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 M. Kulmala S. Sevanto P. Briggs E. van Gorsel H. Cleugh T. Kurtén J. Bäck H. Hakola J. Lauros L. Sogacheva T. Suni Cold oceans enhance terrestrial new-particle formation in near-coastal forests |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The world's forests produce atmospheric aerosol by emitting volatile organic compounds (VOC) which, after being oxidized in the atmosphere, readily condense on the omnipresent nanometer-sized nuclei and grow them to climatically relevant sizes. The cooling effect of aerosols is the greatest uncertainty in current climate models and estimates of radiative forcing. Therefore, identifying the environmental factors influencing the biogenic formation of aerosols is crucial. In this paper, we connected biogenic aerosol formation events observed in a Eucalypt forest in South-East Australia during July 2005–December 2006 to air mass history using 96-h back trajectories. Formation of new particles was most frequent in the dry westerly and south-westerly air masses. According to NDVI (Normalized Difference Vegetation Index) measurements, photosynthesis was not significantly higher in this direction compared to the north-east direction. It is unlikely, therefore, that differences in photosynthesis-derived organic precursor emissions would have been significant enough to lead to the clear difference in NPF frequency between these two directions. Instead, the high evaporation rates above the Pacific Ocean resulted in humid winds from the north-east that effectively suppressed new-particle formation in the forest hundreds of kilometers inland. No other factor varied as significantly in tune with new-particle formation as humidity and we concluded that, in addition to local meteorological factors in the forest, the magnitude of evaporation from oceans hundreds of kilometers upwind can effectively suppress or enhance new-particle formation. Our findings indicate that, unlike warm waters, the cold polar oceans provide excellent clean and dry background air that enhances aerosol formation above near-coastal forests in Fennoscandia and South-East Australia. |
format |
Article in Journal/Newspaper |
author |
M. Kulmala S. Sevanto P. Briggs E. van Gorsel H. Cleugh T. Kurtén J. Bäck H. Hakola J. Lauros L. Sogacheva T. Suni |
author_facet |
M. Kulmala S. Sevanto P. Briggs E. van Gorsel H. Cleugh T. Kurtén J. Bäck H. Hakola J. Lauros L. Sogacheva T. Suni |
author_sort |
M. Kulmala |
title |
Cold oceans enhance terrestrial new-particle formation in near-coastal forests |
title_short |
Cold oceans enhance terrestrial new-particle formation in near-coastal forests |
title_full |
Cold oceans enhance terrestrial new-particle formation in near-coastal forests |
title_fullStr |
Cold oceans enhance terrestrial new-particle formation in near-coastal forests |
title_full_unstemmed |
Cold oceans enhance terrestrial new-particle formation in near-coastal forests |
title_sort |
cold oceans enhance terrestrial new-particle formation in near-coastal forests |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/7679cb4fd5bd4978b36426514d8e3dd1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_source |
Atmospheric Chemistry and Physics, Vol 9, Iss 22, Pp 8639-8650 (2009) |
op_relation |
http://www.atmos-chem-phys.net/9/8639/2009/acp-9-8639-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/7679cb4fd5bd4978b36426514d8e3dd1 |
_version_ |
1765997393594023936 |