Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic
The transport and distribution of short-lived climate forcers in the Arctic is influenced by the prevailing atmospheric circulation patterns. Understanding the coupling between pollutant distribution and dominant atmospheric circulation types is therefore important, not least to understand the proce...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-2021-458 https://acp.copernicus.org/preprints/acp-2021-458/ |
id |
ftcopernicus:oai:publications.copernicus.org:acpd94978 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:acpd94978 2023-05-15T14:38:47+02:00 Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic Thomas, Manu Anna Devasthale, Abhay Nygård, Tiina 2021-06-11 application/pdf https://doi.org/10.5194/acp-2021-458 https://acp.copernicus.org/preprints/acp-2021-458/ eng eng doi:10.5194/acp-2021-458 https://acp.copernicus.org/preprints/acp-2021-458/ eISSN: 1680-7324 Text 2021 ftcopernicus https://doi.org/10.5194/acp-2021-458 2021-06-14T16:22:13Z The transport and distribution of short-lived climate forcers in the Arctic is influenced by the prevailing atmospheric circulation patterns. Understanding the coupling between pollutant distribution and dominant atmospheric circulation types is therefore important, not least to understand the processes governing the local processing of pollutants in the Arctic, but also to test the fidelity of chemistry transport models to simulate the transport from the southerly latitudes. Here, we use a combination of satellite based and reanalysis datasets spanning over 12 years (2007–2018) and investigate the concentrations of NO 2 , O 3 , CO and aerosols and their co-variability during 20 different atmospheric circulation types in the spring season (March, April and May) over the Arctic. We carried out a Self-Organizing Maps analysis of MSLP to derive these circulation types. Although almost all pollutants investigated here show statistically significant sensitivity to the circulation types, NO 2 exhibits the strongest sensitivity among them. The circulation types with low-pressure systems located over the northeast Atlantic show a clear enhancement of NO 2 and AOD in the European Arctic. The O 3 concentrations are, however, decreased. The free tropospheric CO is increased over the Arctic during such events. The circulation types with atmospheric blocking over Greenland and northern Scandinavia show the opposite signal in which the NO 2 concentrations are decreased and AODs are smaller than the climatological values. The O 3 concentrations are, however, increased and the free tropospheric CO decreased during such events. The study provides the most comprehensive assessment so far of the sensitivity of springtime pollutant distribution to the atmospheric circulation types in the Arctic and also provides an observational basis for the evaluation of chemistry transport models. Text Arctic Greenland Northeast Atlantic Copernicus Publications: E-Journals Arctic Greenland |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The transport and distribution of short-lived climate forcers in the Arctic is influenced by the prevailing atmospheric circulation patterns. Understanding the coupling between pollutant distribution and dominant atmospheric circulation types is therefore important, not least to understand the processes governing the local processing of pollutants in the Arctic, but also to test the fidelity of chemistry transport models to simulate the transport from the southerly latitudes. Here, we use a combination of satellite based and reanalysis datasets spanning over 12 years (2007–2018) and investigate the concentrations of NO 2 , O 3 , CO and aerosols and their co-variability during 20 different atmospheric circulation types in the spring season (March, April and May) over the Arctic. We carried out a Self-Organizing Maps analysis of MSLP to derive these circulation types. Although almost all pollutants investigated here show statistically significant sensitivity to the circulation types, NO 2 exhibits the strongest sensitivity among them. The circulation types with low-pressure systems located over the northeast Atlantic show a clear enhancement of NO 2 and AOD in the European Arctic. The O 3 concentrations are, however, decreased. The free tropospheric CO is increased over the Arctic during such events. The circulation types with atmospheric blocking over Greenland and northern Scandinavia show the opposite signal in which the NO 2 concentrations are decreased and AODs are smaller than the climatological values. The O 3 concentrations are, however, increased and the free tropospheric CO decreased during such events. The study provides the most comprehensive assessment so far of the sensitivity of springtime pollutant distribution to the atmospheric circulation types in the Arctic and also provides an observational basis for the evaluation of chemistry transport models. |
format |
Text |
author |
Thomas, Manu Anna Devasthale, Abhay Nygård, Tiina |
spellingShingle |
Thomas, Manu Anna Devasthale, Abhay Nygård, Tiina Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic |
author_facet |
Thomas, Manu Anna Devasthale, Abhay Nygård, Tiina |
author_sort |
Thomas, Manu Anna |
title |
Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic |
title_short |
Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic |
title_full |
Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic |
title_fullStr |
Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic |
title_full_unstemmed |
Influence of springtime atmospheric circulation types on the distribution of air pollutants in the Arctic |
title_sort |
influence of springtime atmospheric circulation types on the distribution of air pollutants in the arctic |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-2021-458 https://acp.copernicus.org/preprints/acp-2021-458/ |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Northeast Atlantic |
genre_facet |
Arctic Greenland Northeast Atlantic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-2021-458 https://acp.copernicus.org/preprints/acp-2021-458/ |
op_doi |
https://doi.org/10.5194/acp-2021-458 |
_version_ |
1766310812530507776 |