On the accuracy of analysed low temperatures in the stratosphere
The accuracy of ECMWF (European Centre for Medium-Range Weather Forecasts) temperatures has been investigated by comparison to radiosonde temperatures. Particularly, the extent of temperatures below which Polar Stratospheric Clouds (PSCs) consisting of nitric acid trihydrate can exist (T<sub&g...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2003-01-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/3/1759/2003/acp-3-1759-2003.pdf |
| id |
doaj-446721b19e0c4829ad1de71eeb779afc |
|---|---|
| record_format |
Article |
| spelling |
doaj-446721b19e0c4829ad1de71eeb779afc2020-11-24T23:09:15ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242003-01-013517591768On the accuracy of analysed low temperatures in the stratosphereB. M. KnudsenThe accuracy of ECMWF (European Centre for Medium-Range Weather Forecasts) temperatures has been investigated by comparison to radiosonde temperatures. Particularly, the extent of temperatures below which Polar Stratospheric Clouds (PSCs) consisting of nitric acid trihydrate can exist (T<sub>NAT</sub>) has been studied. In the 1999/2000 winter analyses and in the 40 year reanalyses (ERA40) from the winter 1996/1997 the analysed extent agrees quite well with the radiosondes extent, whereas the 2002/2003 winter analyses considerably overestimate the extent from 40-11 hPa due to a general cold bias. Close to the frost point small-scale temperature variations, which ECMWF does not catch, substantially increase the extent of these low temperatures. Some of these small-scale variations are caused by lee-waves.http://www.atmos-chem-phys.net/3/1759/2003/acp-3-1759-2003.pdf |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
B. M. Knudsen |
| spellingShingle |
B. M. Knudsen On the accuracy of analysed low temperatures in the stratosphere Atmospheric Chemistry and Physics |
| author_facet |
B. M. Knudsen |
| author_sort |
B. M. Knudsen |
| title |
On the accuracy of analysed low temperatures in the stratosphere |
| title_short |
On the accuracy of analysed low temperatures in the stratosphere |
| title_full |
On the accuracy of analysed low temperatures in the stratosphere |
| title_fullStr |
On the accuracy of analysed low temperatures in the stratosphere |
| title_full_unstemmed |
On the accuracy of analysed low temperatures in the stratosphere |
| title_sort |
on the accuracy of analysed low temperatures in the stratosphere |
| publisher |
Copernicus Publications |
| series |
Atmospheric Chemistry and Physics |
| issn |
1680-7316 1680-7324 |
| publishDate |
2003-01-01 |
| description |
The accuracy of ECMWF (European Centre for Medium-Range Weather Forecasts) temperatures has been investigated by comparison to radiosonde temperatures. Particularly, the extent of temperatures below which Polar Stratospheric Clouds (PSCs) consisting of nitric acid trihydrate can exist (T<sub>NAT</sub>) has been studied. In the 1999/2000 winter analyses and in the 40 year reanalyses (ERA40) from the winter 1996/1997 the analysed extent agrees quite well with the radiosondes extent, whereas the 2002/2003 winter analyses considerably overestimate the extent from 40-11 hPa due to a general cold bias. Close to the frost point small-scale temperature variations, which ECMWF does not catch, substantially increase the extent of these low temperatures. Some of these small-scale variations are caused by lee-waves. |
| url |
http://www.atmos-chem-phys.net/3/1759/2003/acp-3-1759-2003.pdf |
| work_keys_str_mv |
AT bmknudsen ontheaccuracyofanalysedlowtemperaturesinthestratosphere |
| _version_ |
1725610727623884800 |