Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988
Near-ultraviolet and visible spectrographs identical to those employed at McMurdo Station, Antarctica (77.8 S) during the austral spring seasons of 1986 and 1987 were used to study the stratosphere above Thule, Greenland (76.5 N) during early spring, 1988. Observations were carried out both at night...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19890005205 2023-05-15T13:35:10+02:00 Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988 Mount, G. H. Schmeltekopf, A. L. Solomon, S. Jakoubek, R. O. Sanders, R. W. Unclassified, Unlimited, Publicly available May 1, 1988 application/pdf http://hdl.handle.net/2060/19890005205 unknown Document ID: 19890005205 Accession ID: 89N14576 http://hdl.handle.net/2060/19890005205 No Copyright CASI ENVIRONMENT POLLUTION NASA, Goddard Space Flight Center, Polar Ozone Workshop. Abstracts; p 191-192 1988 ftnasantrs 2015-03-15T05:59:46Z Near-ultraviolet and visible spectrographs identical to those employed at McMurdo Station, Antarctica (77.8 S) during the austral spring seasons of 1986 and 1987 were used to study the stratosphere above Thule, Greenland (76.5 N) during early spring, 1988. Observations were carried out both at night using the direct moon as a light source, and during the day by collecting the scattered light from the zenith sky when solar zenith angles were less than about 94.5 degrees. Excellent meteorological conditions prevailed in the troposphere and stratosphere at Thule. Surface weather was extremely clear over most of the period, facilitating measurements of the direct light from the moon. The lower stratospheric arctic polar vortex was located very near Thule throughout the observing period, and temperature at the 30 mbar level were typically below -80 C above Thule, according to the National Meteorological Center daily analyses. Thus conditions were favorable for polar stratospheric cloud formation above Thule. Total column ozone abundances were about 350 to 400 Dobson units, and did not suggest a clear temporal trend over the observing period. Stratospheric nitrogen dioxide measurements were complicated by the presence of a large component of tropospheric pollution on many occasions. Stratospheric nitrogen dioxide could be identified on most days using the absorption in the scattered light from the zenith sky, which greatly enhances the stratospheric airmass while suppressing the tropospheric contribution. These measurements suggest that the total vertical column abundance of nitrogen dioxide present over Thule in February was extremely low, sometimes as low as 3 x 10 to the 14th per sq cm. The abundance of nitrogen dioxide increased systemically from about 3 x 10 to the 14th in late January to 1.0 x 10 to the 15th per sq cm in mid-February, perhaps because of photolysis of N2O5 in the upper part of the stratosphere, near 25 to 35 km. Other/Unknown Material Antarc* Antarctica Arctic Greenland Thule NASA Technical Reports Server (NTRS) Arctic Austral Greenland McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
ENVIRONMENT POLLUTION |
spellingShingle |
ENVIRONMENT POLLUTION Mount, G. H. Schmeltekopf, A. L. Solomon, S. Jakoubek, R. O. Sanders, R. W. Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988 |
topic_facet |
ENVIRONMENT POLLUTION |
description |
Near-ultraviolet and visible spectrographs identical to those employed at McMurdo Station, Antarctica (77.8 S) during the austral spring seasons of 1986 and 1987 were used to study the stratosphere above Thule, Greenland (76.5 N) during early spring, 1988. Observations were carried out both at night using the direct moon as a light source, and during the day by collecting the scattered light from the zenith sky when solar zenith angles were less than about 94.5 degrees. Excellent meteorological conditions prevailed in the troposphere and stratosphere at Thule. Surface weather was extremely clear over most of the period, facilitating measurements of the direct light from the moon. The lower stratospheric arctic polar vortex was located very near Thule throughout the observing period, and temperature at the 30 mbar level were typically below -80 C above Thule, according to the National Meteorological Center daily analyses. Thus conditions were favorable for polar stratospheric cloud formation above Thule. Total column ozone abundances were about 350 to 400 Dobson units, and did not suggest a clear temporal trend over the observing period. Stratospheric nitrogen dioxide measurements were complicated by the presence of a large component of tropospheric pollution on many occasions. Stratospheric nitrogen dioxide could be identified on most days using the absorption in the scattered light from the zenith sky, which greatly enhances the stratospheric airmass while suppressing the tropospheric contribution. These measurements suggest that the total vertical column abundance of nitrogen dioxide present over Thule in February was extremely low, sometimes as low as 3 x 10 to the 14th per sq cm. The abundance of nitrogen dioxide increased systemically from about 3 x 10 to the 14th in late January to 1.0 x 10 to the 15th per sq cm in mid-February, perhaps because of photolysis of N2O5 in the upper part of the stratosphere, near 25 to 35 km. |
format |
Other/Unknown Material |
author |
Mount, G. H. Schmeltekopf, A. L. Solomon, S. Jakoubek, R. O. Sanders, R. W. |
author_facet |
Mount, G. H. Schmeltekopf, A. L. Solomon, S. Jakoubek, R. O. Sanders, R. W. |
author_sort |
Mount, G. H. |
title |
Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988 |
title_short |
Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988 |
title_full |
Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988 |
title_fullStr |
Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988 |
title_full_unstemmed |
Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988 |
title_sort |
visible and near-ultraviolet spectroscopy at thule afb (76.5 n) from january 28 - february 15, 1988 |
publishDate |
1988 |
url |
http://hdl.handle.net/2060/19890005205 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(166.667,166.667,-77.850,-77.850) |
geographic |
Arctic Austral Greenland McMurdo Station |
geographic_facet |
Arctic Austral Greenland McMurdo Station |
genre |
Antarc* Antarctica Arctic Greenland Thule |
genre_facet |
Antarc* Antarctica Arctic Greenland Thule |
op_source |
CASI |
op_relation |
Document ID: 19890005205 Accession ID: 89N14576 http://hdl.handle.net/2060/19890005205 |
op_rights |
No Copyright |
_version_ |
1766061954313486336 |