Comparison of GPS/SAC-C and MIPAS/ENVISAT Temperature Profiles and Its Possible Implementation for EOS MLS Observations

Jiang, Jonathan H.; Wang, Ding Yi; Romans, L.J.; Ao, C. O.; Schwartz, M.; Stiller, G. P.; Clarmann, T. von; López‐Puertas, M.; Funke, B.; Gil-López, S.; Glatthor, N.; Grabowski, U.; Höpfner, Michael; Kellmann, S.; Kiefer, Michael; Linden, A.; Tsidu, Gizaw Mengistu; Milz, M.; Steck, T.; Fischer, H.

doi:10.1007/3-540-26800-6_91

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…The CHAMP results for period I are given by Wang et al [2004c]. The comparison with SAC‐C measurements of period I was conducted by Jiang et al [2004] without the adjustment of vertical resolution and a priori information, and reanalyzed here with the adjustment applied (Figure 10).…”

Section: Comparison Resultsmentioning

confidence: 99%

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Validation of stratospheric temperatures measured by Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat

Wang¹

2005

J. Geophys. Res.

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The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard the Envisat satellite provides temperature and various gas profiles from limb‐viewing midinfrared emission measurements. The stratospheric temperatures retrieved at the Institut für Meteorologie und Klimaforschung (IMK) for September/October 2002 and October/November 2003 are compared with a number of reference data sets, including global radiosonde (RS) observations, radio occultation (RO) measurements of Global Positioning System (GPS) on German Challenging Minisatellite Payload (CHAMP) and Argentinean Satelite de Aplicaciones Cientificas‐C (SAC‐C) satellite, Halogen Occultation Experiment (HALOE) on the Upper Atmosphere Research Satellite (UARS), and the analyses of European Centre for Medium‐Range Weather Forecasts (ECMWF) and Met Office (METO), United Kingdom. The data sets show a good general agreement. Between 10 and 30 km altitude the mean differences are within ±0.5 K for the averages over the height interval and within ±(1–1.5) K at individual levels for comparisons with RS, GPS‐RO/CHAMP, and SAC‐C, ECMWF, and METO. Between 30 and 45 km the MIPAS mean temperatures, averaged over the height region, are higher than ECMWF but lower than METO by ∼1.5 K, while they differ by ±0.5 K with respect to HALOE, with maximum discrepancies of ∼2.5 K peaking around 35 km. Between 45 and 50 km, MIPAS temperatures show a low bias compared to HALOE, ECMWF, and METO with mean differences of −1 to −3 K and with a better agreement with HALOE. The large discrepancies between MIPAS and the analyses above 30 km likely suggest deficiency in the underlying general circulation models. The standard deviations vary between 2.5 and 3.5 K for individual data sets, with more than 70% being contributed from the expected variability of the atmosphere. Retrieved temperatures with accuracy of ∼0.5–1 K after removing the atmospheric variability provide highly accurate knowledge to characterize our environment.

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Section: Comparison Resultsmentioning

confidence: 99%

“…The MIPAS IMK‐IAA temperatures have been compared with a number of other satellite measurements. The preliminary results show good agreement [ Wang et al , 2004a, 2004b, 2004c; Jiang et al , 2004; Dethof et al , 2004].…”

Section: Introductionmentioning

confidence: 84%

Validation of stratospheric temperatures measured by Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat

Wang¹

2005

J. Geophys. Res.

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“…The MIPAS and CHAMP comparison studies demonstrated a maximum bias of ∼1-1.5 K at 30 km . Further, using the MIPAS and SAC-C data sets, Jiang et al (2004) estimated the mean differences for 5-30 km and for two different seasons. Their estimate was less than ∼2 K. It is appropriate to show the statistical estimates of the bias between the COSMIC-NCEP, COSMIC-MetO and COSMIC-JRA-25 measurements obtained for different latitude sectors for summer and winter seasons at 100 hPa and 50 hPa, and are shown in Tables 1 and 2.…”

Section: Longitudinal -Latitudinal Temperature Variationsmentioning

confidence: 99%

Global temperature estimates in the troposphere and stratosphere: a validation study of COSMIC/FORMOSAT-3 measurements

et al. 2009

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Abstract. This paper mainly focuses on the validation of temperature estimates derived with the newly launched Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC)/Formosa Satellite 3 (FORMOSAT-3) system. The analysis is based on the radio occultation (RO) data samples collected during the first year observation from April 2006 to April 2007. For the validation, we have used the operational stratospheric analyses including the National Centers for Environmental Prediction -Reanalysis (NCEP), the Japanese 25-year Reanalysis (JRA-25), and the United Kingdom Met Office (MetO) data sets. Comparisons done in different formats reveal good agreement between the COSMIC and reanalysis outputs. Spatially, the largest deviations are noted in the polar latitudes, and heightwise, the tropical tropopause region noted the maximum differences (2-4 K). We found that among the three reanalysis data sets the NCEP data sets have the best resemblance with the COSMIC measurements.

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“…Of long‐term and strategic importance, this will establish basic conditions for their use in operational meteorology. The MIPAS IMK temperatures have previously been compared with the GPS‐RO/CHAMP GFZ data [ Wang et al , 2004a] and the GPS‐RO/SAC‐C measurements [ Jiang et al , 2004a], as well as with a number of other satellite observations [ Wang et al , 2004b]. They found that the MIPAS IMK temperatures showed good consistency with those of the GPS‐RO/CHAMP GFZ and SAC‐C data during the stratospheric major sudden warming in the southern hemisphere winter of 2002, with the overall mean differences and standard deviations estimated at ∼1 K and ∼5 K, respectively.…”

Section: Introductionmentioning

confidence: 99%

Cross‐validation of MIPAS/ENVISAT and GPS‐RO/CHAMP temperature profiles

et al. 2004

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[1] The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board the ENVISAT and the Global Positioning System (GPS) receiver on the Challenging Mini-Satellite Payload (CHAMP) provide temperature profiles by limb-viewing midinfrared emission and radio occultation (RO) measurements, respectively. The MIPAS temperatures retrieved at the Institut für Meteorologie und Klimaforschung (IMK) are compared with the GPS-RO/CHAMP observations derived at Jet Propulsion Laboratory (JPL) and GeoForschungsZentrum (GFZ) Potsdam. The three data sets show generally good agreement. The global mean differences averaged between 8 and 30 km in 14 days of September/October 2002 are À0.44 ± 0.02 K and 0.07 ± 0.02 K for MIPAS/GPS-RO JPL and GFZ comparisons, respectively. The MIPAS global mean temperatures below 25 km are slightly lower than those of GPS-RO JPL and GFZ by less than 1 K and 0.2 K, respectively. Above 25 km, the MIPAS temperatures are higher than the JPL and GFZ data, in particular near both poles and the equator, with maxima of 1 K for JPL and 1.5 K for GFZ at 30 km. The standard deviations are $2-4 K. Possible explanations for the observed differences include (1) effect of spatial and temporal mismatch between the correlative measurements on the observed standard deviations, in particular in regions and episodes of enhanced wave activity; (2) a negative bias in GPS-RO/CHAMP temperatures in regions of increased humidity; (3) a mapping of initialization temperature profiles on GPS-RO/CHAMP retrievals at altitudes where low refraction contains no information on air density; and (4) measurement errors of both instruments, particularly the errors due to insufficient knowledge of the instrument line shape and spectroscopy in current MIPAS retrievals.

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Comparison of GPS/SAC-C and MIPAS/ENVISAT Temperature Profiles and Its Possible Implementation for EOS MLS Observations

Cited by 6 publications

References 9 publications

Validation of stratospheric temperatures measured by Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat

Validation of stratospheric temperatures measured by Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat

Global temperature estimates in the troposphere and stratosphere: a validation study of COSMIC/FORMOSAT-3 measurements

Cross‐validation of MIPAS/ENVISAT and GPS‐RO/CHAMP temperature profiles

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