Validation of MIPAS HNO3 operational data
Nitric acid (HNO<sub>3</sub>) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVISAT. The product version 4.61/4.62 for the...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2007-09-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/7/4905/2007/acp-7-4905-2007.pdf |
| _version_ | 1818758078147854336 |
|---|---|
| author | C. D. Boone P. F. Bernath D. Murtagh T. Sugita J. Urban N. Jones H. Nakajima D. Smale S. Wood P. Demoulin E. Mahieu C. Vigouroux M. De Mazière N. Huret V. Catoire G. Redaelli M. Pirre G. Bianchini F. Mencaraglia U. Cortesi G. Wetzel H. Oelhaf S. Mikuteit G. Y. Liu C. Keim F. Hase T. Blumenstock H. Fischer W. E. Ward C. E. Blom M. Höpfner D. Y. Wang K. A. Walker J. Kuttippurath A. Kleinböhl G. Toon C. Piccolo |
| author_facet | C. D. Boone P. F. Bernath D. Murtagh T. Sugita J. Urban N. Jones H. Nakajima D. Smale S. Wood P. Demoulin E. Mahieu C. Vigouroux M. De Mazière N. Huret V. Catoire G. Redaelli M. Pirre G. Bianchini F. Mencaraglia U. Cortesi G. Wetzel H. Oelhaf S. Mikuteit G. Y. Liu C. Keim F. Hase T. Blumenstock H. Fischer W. E. Ward C. E. Blom M. Höpfner D. Y. Wang K. A. Walker J. Kuttippurath A. Kleinböhl G. Toon C. Piccolo |
| author_sort | C. D. Boone |
| collection | DOAJ |
| description | Nitric acid (HNO<sub>3</sub>) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVISAT. The product version 4.61/4.62 for the observation period between July 2002 and March 2004 is validated by comparisons with a number of independent observations from ground-based stations, aircraft/balloon campaigns, and satellites. Individual HNO<sub>3</sub> profiles of the ESA MIPAS level-2 product show good agreement with those of MIPAS-B and MIPAS-STR (the balloon and aircraft version of MIPAS, respectively), and the balloon-borne infrared spectrometers MkIV and SPIRALE, mostly matching the reference data within the combined instrument error bars. In most cases differences between the correlative measurement pairs are less than 1 ppbv (5–10%) throughout the entire altitude range up to about 38 km (~6 hPa), and below 0.5 ppbv (15–20% or more) above 30 km (~17 hPa). However, differences up to 4 ppbv compared to MkIV have been found at high latitudes in December 2002 in the presence of polar stratospheric clouds. The degree of consistency is further largely affected by the temporal and spatial coincidence, and differences of 2 ppbv may be observed between 22 and 26 km (~50 and 30 hPa) at high latitudes near the vortex boundary, due to large horizontal inhomogeneity of HNO<sub>3</sub>. Similar features are also observed in the mean differences of the MIPAS ESA HNO<sub>3</sub> VMRs with respect to the ground-based FTIR measurements at five stations, aircraft-based SAFIRE-A and ASUR, and the balloon campaign IBEX. The mean relative differences between the MIPAS and FTIR HNO<sub>3</sub> partial columns are within ±2%, comparable to the MIPAS systematic error of ~2%. For the vertical profiles, the biases between the MIPAS and FTIR data are generally below 10% in the altitudes of 10 to 30 km. The MIPAS and SAFIRE HNO<sub>3</sub> data generally match within their total error bars for the mid and high latitude flights, despite the larger atmospheric inhomogeneities that characterize the measurement scenario at higher latitudes. The MIPAS and ASUR comparison reveals generally good agreements better than 10–13% at 20–34 km. The MIPAS and IBEX measurements agree reasonably well (mean relative differences within ±15%) between 17 and 32 km. Statistical comparisons of the MIPAS profiles correlated with those of Odin/SMR, ILAS-II, and ACE-FTS generally show good consistency. The mean differences averaged over individual latitude bands or all bands are within the combined instrument errors, and generally within 1, 0.5, and 0.3 ppbv between 10 and 40 km (~260 and 4.5 hPa) for Odin/SMR, ILAS-II, and ACE-FTS, respectively. The standard deviations of the differences are between 1 to 2 ppbv. The standard deviations for the satellite comparisons and for almost all other comparisons are generally larger than the estimated measurement uncertainty. This is associated with the temporal and spatial coincidence error and the horizontal smoothing error which are not taken into account in our error budget. Both errors become large when the spatial variability of the target molecule is high. |
| first_indexed | 2024-12-18T06:21:06Z |
| format | Article |
| id | doaj.art-513f7a2bdd04445d96026101c591d735 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-18T06:21:06Z |
| publishDate | 2007-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-513f7a2bdd04445d96026101c591d7352022-12-21T21:18:08ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242007-09-0171849054934Validation of MIPAS HNO3 operational dataC. D. BooneP. F. BernathD. MurtaghT. SugitaJ. UrbanN. JonesH. NakajimaD. SmaleS. WoodP. DemoulinE. MahieuC. VigourouxM. De MazièreN. HuretV. CatoireG. RedaelliM. PirreG. BianchiniF. MencaragliaU. CortesiG. WetzelH. OelhafS. MikuteitG. Y. LiuC. KeimF. HaseT. BlumenstockH. FischerW. E. WardC. E. BlomM. HöpfnerD. Y. WangK. A. WalkerJ. KuttippurathA. KleinböhlG. ToonC. PiccoloNitric acid (HNO<sub>3</sub>) is one of the key products that are operationally retrieved by the European Space Agency (ESA) from the emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVISAT. The product version 4.61/4.62 for the observation period between July 2002 and March 2004 is validated by comparisons with a number of independent observations from ground-based stations, aircraft/balloon campaigns, and satellites. Individual HNO<sub>3</sub> profiles of the ESA MIPAS level-2 product show good agreement with those of MIPAS-B and MIPAS-STR (the balloon and aircraft version of MIPAS, respectively), and the balloon-borne infrared spectrometers MkIV and SPIRALE, mostly matching the reference data within the combined instrument error bars. In most cases differences between the correlative measurement pairs are less than 1 ppbv (5–10%) throughout the entire altitude range up to about 38 km (~6 hPa), and below 0.5 ppbv (15–20% or more) above 30 km (~17 hPa). However, differences up to 4 ppbv compared to MkIV have been found at high latitudes in December 2002 in the presence of polar stratospheric clouds. The degree of consistency is further largely affected by the temporal and spatial coincidence, and differences of 2 ppbv may be observed between 22 and 26 km (~50 and 30 hPa) at high latitudes near the vortex boundary, due to large horizontal inhomogeneity of HNO<sub>3</sub>. Similar features are also observed in the mean differences of the MIPAS ESA HNO<sub>3</sub> VMRs with respect to the ground-based FTIR measurements at five stations, aircraft-based SAFIRE-A and ASUR, and the balloon campaign IBEX. The mean relative differences between the MIPAS and FTIR HNO<sub>3</sub> partial columns are within ±2%, comparable to the MIPAS systematic error of ~2%. For the vertical profiles, the biases between the MIPAS and FTIR data are generally below 10% in the altitudes of 10 to 30 km. The MIPAS and SAFIRE HNO<sub>3</sub> data generally match within their total error bars for the mid and high latitude flights, despite the larger atmospheric inhomogeneities that characterize the measurement scenario at higher latitudes. The MIPAS and ASUR comparison reveals generally good agreements better than 10–13% at 20–34 km. The MIPAS and IBEX measurements agree reasonably well (mean relative differences within ±15%) between 17 and 32 km. Statistical comparisons of the MIPAS profiles correlated with those of Odin/SMR, ILAS-II, and ACE-FTS generally show good consistency. The mean differences averaged over individual latitude bands or all bands are within the combined instrument errors, and generally within 1, 0.5, and 0.3 ppbv between 10 and 40 km (~260 and 4.5 hPa) for Odin/SMR, ILAS-II, and ACE-FTS, respectively. The standard deviations of the differences are between 1 to 2 ppbv. The standard deviations for the satellite comparisons and for almost all other comparisons are generally larger than the estimated measurement uncertainty. This is associated with the temporal and spatial coincidence error and the horizontal smoothing error which are not taken into account in our error budget. Both errors become large when the spatial variability of the target molecule is high.http://www.atmos-chem-phys.net/7/4905/2007/acp-7-4905-2007.pdf |
| spellingShingle | C. D. Boone P. F. Bernath D. Murtagh T. Sugita J. Urban N. Jones H. Nakajima D. Smale S. Wood P. Demoulin E. Mahieu C. Vigouroux M. De Mazière N. Huret V. Catoire G. Redaelli M. Pirre G. Bianchini F. Mencaraglia U. Cortesi G. Wetzel H. Oelhaf S. Mikuteit G. Y. Liu C. Keim F. Hase T. Blumenstock H. Fischer W. E. Ward C. E. Blom M. Höpfner D. Y. Wang K. A. Walker J. Kuttippurath A. Kleinböhl G. Toon C. Piccolo Validation of MIPAS HNO3 operational data Atmospheric Chemistry and Physics |
| title | Validation of MIPAS HNO3 operational data |
| title_full | Validation of MIPAS HNO3 operational data |
| title_fullStr | Validation of MIPAS HNO3 operational data |
| title_full_unstemmed | Validation of MIPAS HNO3 operational data |
| title_short | Validation of MIPAS HNO3 operational data |
| title_sort | validation of mipas hno3 operational data |
| url | http://www.atmos-chem-phys.net/7/4905/2007/acp-7-4905-2007.pdf |
| work_keys_str_mv | AT cdboone validationofmipashno3operationaldata AT pfbernath validationofmipashno3operationaldata AT dmurtagh validationofmipashno3operationaldata AT tsugita validationofmipashno3operationaldata AT jurban validationofmipashno3operationaldata AT njones validationofmipashno3operationaldata AT hnakajima validationofmipashno3operationaldata AT dsmale validationofmipashno3operationaldata AT swood validationofmipashno3operationaldata AT pdemoulin validationofmipashno3operationaldata AT emahieu validationofmipashno3operationaldata AT cvigouroux validationofmipashno3operationaldata AT mdemaziere validationofmipashno3operationaldata AT nhuret validationofmipashno3operationaldata AT vcatoire validationofmipashno3operationaldata AT gredaelli validationofmipashno3operationaldata AT mpirre validationofmipashno3operationaldata AT gbianchini validationofmipashno3operationaldata AT fmencaraglia validationofmipashno3operationaldata AT ucortesi validationofmipashno3operationaldata AT gwetzel validationofmipashno3operationaldata AT hoelhaf validationofmipashno3operationaldata AT smikuteit validationofmipashno3operationaldata AT gyliu validationofmipashno3operationaldata AT ckeim validationofmipashno3operationaldata AT fhase validationofmipashno3operationaldata AT tblumenstock validationofmipashno3operationaldata AT hfischer validationofmipashno3operationaldata AT weward validationofmipashno3operationaldata AT ceblom validationofmipashno3operationaldata AT mhopfner validationofmipashno3operationaldata AT dywang validationofmipashno3operationaldata AT kawalker validationofmipashno3operationaldata AT jkuttippurath validationofmipashno3operationaldata AT akleinbohl validationofmipashno3operationaldata AT gtoon validationofmipashno3operationaldata AT cpiccolo validationofmipashno3operationaldata |