OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations
Chlorine dioxide (OClO) is a by-product of the ozone-depleting halogen chemistry in the stratosphere. Although it is rapidly photolysed at low solar zenith angles (SZAs), it plays an important role as an indicator of the chlorine activation in polar regions during polar winter and spring at twilight...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-22-245-2022 https://doaj.org/article/61ce41c6a6524ce0893fc04e48d9dc61 |
id |
ftdoajarticles:oai:doaj.org/article:61ce41c6a6524ce0893fc04e48d9dc61 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:61ce41c6a6524ce0893fc04e48d9dc61 2023-05-15T13:56:57+02:00 OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations J. Puķīte C. Borger S. Dörner M. Gu T. Wagner 2022-01-01T00:00:00Z https://doi.org/10.5194/acp-22-245-2022 https://doaj.org/article/61ce41c6a6524ce0893fc04e48d9dc61 EN eng Copernicus Publications https://acp.copernicus.org/articles/22/245/2022/acp-22-245-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-245-2022 1680-7316 1680-7324 https://doaj.org/article/61ce41c6a6524ce0893fc04e48d9dc61 Atmospheric Chemistry and Physics, Vol 22, Pp 245-272 (2022) Physics QC1-999 Chemistry QD1-999 article 2022 ftdoajarticles https://doi.org/10.5194/acp-22-245-2022 2022-12-31T08:06:30Z Chlorine dioxide (OClO) is a by-product of the ozone-depleting halogen chemistry in the stratosphere. Although it is rapidly photolysed at low solar zenith angles (SZAs), it plays an important role as an indicator of the chlorine activation in polar regions during polar winter and spring at twilight conditions because of the nearly linear dependence of its formation on chlorine oxide (ClO). Here, we compare slant column densities (SCDs) of chlorine dioxide (OClO) retrieved by means of differential optical absorption spectroscopy (DOAS) from spectra measured by the TROPOspheric Monitoring Instrument (TROPOMI) with meteorological data for both Antarctic and Arctic regions for the first three winters in each of the hemispheres (November 2017–October 2020). TROPOMI, a UV–Vis–NIR–SWIR instrument on board of the Sentinel-5P satellite, monitors the Earth's atmosphere in a near-polar orbit at an unprecedented spatial resolution and signal-to-noise ratio and provides daily global coverage at the Equator and thus even more frequent observations at polar regions. The observed OClO SCDs are generally well correlated with the meteorological conditions in the polar winter stratosphere; for example, the chlorine activation signal appears as a sharp gradient in the time series of the OClO SCDs once the temperature drops to values well below the nitric acid trihydrate (NAT) existence temperature ( T NAT ). Also a relation of enhanced OClO values at lee sides of mountains can be observed at the beginning of the winters, indicating a possible effect of lee waves on chlorine activation. The dataset is also compared with CALIPSO Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) polar stratospheric cloud (PSC) observations. In general, OClO SCDs coincide well with CALIOP measurements for which PSCs are detected. Very high OClO levels are observed for the northern hemispheric winter 2019/20, with an extraordinarily long period with a stable polar vortex being even close to the values found for southern hemispheric winters. An ... Article in Journal/Newspaper Antarc* Antarctic Arctic Directory of Open Access Journals: DOAJ Articles Arctic Antarctic The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) Atmospheric Chemistry and Physics 22 1 245 272 |
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 J. Puķīte C. Borger S. Dörner M. Gu T. Wagner OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Chlorine dioxide (OClO) is a by-product of the ozone-depleting halogen chemistry in the stratosphere. Although it is rapidly photolysed at low solar zenith angles (SZAs), it plays an important role as an indicator of the chlorine activation in polar regions during polar winter and spring at twilight conditions because of the nearly linear dependence of its formation on chlorine oxide (ClO). Here, we compare slant column densities (SCDs) of chlorine dioxide (OClO) retrieved by means of differential optical absorption spectroscopy (DOAS) from spectra measured by the TROPOspheric Monitoring Instrument (TROPOMI) with meteorological data for both Antarctic and Arctic regions for the first three winters in each of the hemispheres (November 2017–October 2020). TROPOMI, a UV–Vis–NIR–SWIR instrument on board of the Sentinel-5P satellite, monitors the Earth's atmosphere in a near-polar orbit at an unprecedented spatial resolution and signal-to-noise ratio and provides daily global coverage at the Equator and thus even more frequent observations at polar regions. The observed OClO SCDs are generally well correlated with the meteorological conditions in the polar winter stratosphere; for example, the chlorine activation signal appears as a sharp gradient in the time series of the OClO SCDs once the temperature drops to values well below the nitric acid trihydrate (NAT) existence temperature ( T NAT ). Also a relation of enhanced OClO values at lee sides of mountains can be observed at the beginning of the winters, indicating a possible effect of lee waves on chlorine activation. The dataset is also compared with CALIPSO Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) polar stratospheric cloud (PSC) observations. In general, OClO SCDs coincide well with CALIOP measurements for which PSCs are detected. Very high OClO levels are observed for the northern hemispheric winter 2019/20, with an extraordinarily long period with a stable polar vortex being even close to the values found for southern hemispheric winters. An ... |
format |
Article in Journal/Newspaper |
author |
J. Puķīte C. Borger S. Dörner M. Gu T. Wagner |
author_facet |
J. Puķīte C. Borger S. Dörner M. Gu T. Wagner |
author_sort |
J. Puķīte |
title |
OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations |
title_short |
OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations |
title_full |
OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations |
title_fullStr |
OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations |
title_full_unstemmed |
OClO as observed by TROPOMI: a comparison with meteorological parameters and polar stratospheric cloud observations |
title_sort |
oclo as observed by tropomi: a comparison with meteorological parameters and polar stratospheric cloud observations |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-245-2022 https://doaj.org/article/61ce41c6a6524ce0893fc04e48d9dc61 |
long_lat |
ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
Arctic Antarctic The Sentinel |
geographic_facet |
Arctic Antarctic The Sentinel |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 22, Pp 245-272 (2022) |
op_relation |
https://acp.copernicus.org/articles/22/245/2022/acp-22-245-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-245-2022 1680-7316 1680-7324 https://doaj.org/article/61ce41c6a6524ce0893fc04e48d9dc61 |
op_doi |
https://doi.org/10.5194/acp-22-245-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
1 |
container_start_page |
245 |
op_container_end_page |
272 |
_version_ |
1766264555885821952 |