Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado
<p>This study compares time series of stratospheric water vapor (SWV) data at 30 and 50 hPa from 1993 to 2005, based on sets of Halogen Occultation Experiment (HALOE) profiles above the region of Boulder, CO (40<span class="inline-formula"><sup>∘</sup></span> ...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-08-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/23/9637/2023/acp-23-9637-2023.pdf |
| _version_ | 1827855904238731264 |
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| author | E. Remsberg |
| author_facet | E. Remsberg |
| author_sort | E. Remsberg |
| collection | DOAJ |
| description | <p>This study compares time series of stratospheric water vapor (SWV) data at 30 and 50 hPa from 1993 to 2005, based on sets of Halogen Occultation Experiment (HALOE) profiles above the region of Boulder, CO (40<span class="inline-formula"><sup>∘</sup></span> N, 255<span class="inline-formula"><sup>∘</sup></span> E), and on local frost-point hygrometer (FPH) measurements. Their differing trends herein agree with most of the previously published findings. FPH trends are presumed to be accurate within their data uncertainties, and there are no known measurement biases
affecting the HALOE trends. However, the seasonal sampling from HALOE is
deficient at 40<span class="inline-formula"><sup>∘</sup></span> N from 2001 to 2005, especially during late
winter and springtime, when HALOE SWV time series at 55<span class="inline-formula"><sup>∘</sup></span> N clearly
show a springtime maximum. This study finds that the SWV trends from HALOE
and FPH measurements nearly agree within uncertainties at 30 hPa for the more limited
time span of 1993 to 2002. Yet, HALOE SWV at 50 hPa has significant and
perhaps uncertain corrections for interfering aerosols from 1992 to 1994.
Northern Hemisphere time series and daily SWV plots near 30 hPa from the
Limb Infrared Monitor of the Stratosphere (LIMS) experiment indicate that
there is transport of filaments of high SWV from polar to middle latitudes
during dynamically active winter and springtime periods. Although FPH
measurements sense SWV variations at all scales, the HALOE time series do
not resolve smaller-scale structures because its time series data are based
on an average of four or more occultations within a finite latitude–longitude sector. It is concluded that the variations and trends of HALOE SWV are reasonable at 40<span class="inline-formula"><sup>∘</sup></span> N and 30 hPa from 1993 to 2002 and in accord with the spatial scales of its measurements and sampling
frequencies.</p> |
| first_indexed | 2024-03-12T12:17:13Z |
| format | Article |
| id | doaj.art-f3996fdb737b4c91b661014f11064ceb |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-03-12T12:17:13Z |
| publishDate | 2023-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-f3996fdb737b4c91b661014f11064ceb2023-08-30T10:22:12ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242023-08-01239637964610.5194/acp-23-9637-2023Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, ColoradoE. Remsberg<p>This study compares time series of stratospheric water vapor (SWV) data at 30 and 50 hPa from 1993 to 2005, based on sets of Halogen Occultation Experiment (HALOE) profiles above the region of Boulder, CO (40<span class="inline-formula"><sup>∘</sup></span> N, 255<span class="inline-formula"><sup>∘</sup></span> E), and on local frost-point hygrometer (FPH) measurements. Their differing trends herein agree with most of the previously published findings. FPH trends are presumed to be accurate within their data uncertainties, and there are no known measurement biases affecting the HALOE trends. However, the seasonal sampling from HALOE is deficient at 40<span class="inline-formula"><sup>∘</sup></span> N from 2001 to 2005, especially during late winter and springtime, when HALOE SWV time series at 55<span class="inline-formula"><sup>∘</sup></span> N clearly show a springtime maximum. This study finds that the SWV trends from HALOE and FPH measurements nearly agree within uncertainties at 30 hPa for the more limited time span of 1993 to 2002. Yet, HALOE SWV at 50 hPa has significant and perhaps uncertain corrections for interfering aerosols from 1992 to 1994. Northern Hemisphere time series and daily SWV plots near 30 hPa from the Limb Infrared Monitor of the Stratosphere (LIMS) experiment indicate that there is transport of filaments of high SWV from polar to middle latitudes during dynamically active winter and springtime periods. Although FPH measurements sense SWV variations at all scales, the HALOE time series do not resolve smaller-scale structures because its time series data are based on an average of four or more occultations within a finite latitude–longitude sector. It is concluded that the variations and trends of HALOE SWV are reasonable at 40<span class="inline-formula"><sup>∘</sup></span> N and 30 hPa from 1993 to 2002 and in accord with the spatial scales of its measurements and sampling frequencies.</p>https://acp.copernicus.org/articles/23/9637/2023/acp-23-9637-2023.pdf |
| spellingShingle | E. Remsberg Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado Atmospheric Chemistry and Physics |
| title | Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado |
| title_full | Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado |
| title_fullStr | Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado |
| title_full_unstemmed | Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado |
| title_short | Technical note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado |
| title_sort | technical note on haloe stratospheric water vapor variations and trends at boulder colorado |
| url | https://acp.copernicus.org/articles/23/9637/2023/acp-23-9637-2023.pdf |
| work_keys_str_mv | AT eremsberg technicalnoteonhaloestratosphericwatervaporvariationsandtrendsatbouldercolorado |