GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique

Beyerle, G.; Schmidt, T.; Michalak, Grzegorz; Heise, S.; Wickert, Jens; Reigber, Christoph

doi:10.1029/2005gl023109

Cited by 145 publications

(117 citation statements)

References 13 publications

(21 reference statements)

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“…The COSMIC measurements are the BUFR product provided by the University Corporation for Atmospheric Research (UCAR) (Kuo et al, 2004). Although the primary focus of this work is the forecast impact of COSMIC measurements, we have also assimilated CHAMP and GRACE-A measurements 112 S. B. Healy (Wickert et al, 2001;Beyerle et al, 2005;Wickert et al, 2005) when they are available. The GPSRO bending angle profiles, α, are assimilated using a onedimensional operator (Healy and Thépaut, 2006).…”

Section: Description Of Assimilation System and Observationsmentioning

confidence: 99%

Forecast impact experiment with a constellation of GPS radio occultation receivers

Healy

2008

Atmospheric Science Letters

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A forecast impact experiment with a constellation of global positioning system radio occultation (GPSRO) receivers is presented. The constellation includes the six COSMIC/FORMO-SAT-3 satellites, combined with the GRACE-A and CHAMP satellites. It is shown that rising and setting occultations measured with the COSMIC satellites have similar bending angle error characteristics. The GPSRO measurements improve the root mean square (rms) geopotential height forecast errors at 500, 200, and 100 hPa in both the Northern and Southern Hemispheres. The forecast fit to radiosonde temperature measurements in the Stratosphere is also improved.

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Section: Description Of Assimilation System and Observationsmentioning

confidence: 99%

Forecast impact experiment with a constellation of GPS radio occultation receivers

Healy

2008

Atmospheric Science Letters

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“…For Fig. 1 only, we added two earlier GPS-RO satellite missions: CHAMP (Wickert et al, 2001) and GRACE (Beyerle et al, 2005), which provide less observations (around 200 profiles per day together) for [2002][2003][2004][2005][2006][2007].…”

Section: Data Setsmentioning

confidence: 99%

The tropical tropopause inversion layer: variability and modulation by equatorial waves

2016

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Abstract. The tropical tropopause layer (TTL) acts as a transition layer between the troposphere and the stratosphere over several kilometers, where air has both tropospheric and stratospheric properties. Within this region, a fine-scale feature is located: the tropopause inversion layer (TIL), which consists of a sharp temperature inversion at the tropopause and the corresponding high static stability values right above, which theoretically affect the dispersion relations of atmospheric waves like Rossby or inertia-gravity waves and hamper stratosphere-troposphere exchange (STE). Therefore, the TIL receives increasing attention from the scientific community, mainly in the extratropics so far. Our goal is to give a detailed picture of the properties, variability and forcings of the tropical TIL, with special emphasis on small-scale equatorial waves and the quasi-biennial oscillation (QBO).We use high-resolution temperature profiles from the COSMIC satellite mission, i.e., ∼ 2000 measurements per day globally, between 2007 and 2013, to derive TIL properties and to study the fine-scale structures of static stability in the tropics. The situation at near tropopause level is described by the 100 hPa horizontal wind divergence fields, and the vertical structure of the QBO is provided by the equatorial winds at all levels, both from the ERA-Interim reanalysis.We describe a new feature of the equatorial static stability profile: a secondary stability maximum below the zero wind line within the easterly QBO wind regime at about 20-25 km altitude, which is forced by the descending westerly QBO phase and gives a double-TIL-like structure. In the lowermost stratosphere, the TIL is stronger with westerly winds. We provide the first evidence of a relationship between the tropical TIL strength and near-tropopause divergence, with stronger (weaker) TIL with near-tropopause divergent (convergent) flow, a relationship analogous to that of TIL strength with relative vorticity in the extratropics.To elucidate possible enhancing mechanisms of the tropical TIL, we quantify the signature of the different equatorial waves on the vertical structure of static stability in the tropics. All waves show, on average, maximum cold anomalies at the thermal tropopause, warm anomalies above and a net TIL enhancement close to the tropopause. The main drivers are Kelvin, inertia-gravity and Rossby waves. We suggest that a similar wave modulation will exist at mid-and polar latitudes from the extratropical wave modes.

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“…Jakowski et al 2002;Jakowski 2005;Wickert et al 2009), GRACE (e.g. Beyerle et al 2005). These satellites performing RO experiments are mainly solo-satellite missions which are not dedicated to monitor space weather rapid changes on a global scale.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric electron density observed by FORMOSAT-3/COSMIC over the European region and validated by ionosonde data

Krankowski

Zakharenkova

Krypiak-Gregorczyk

et al. 2011

J Geod

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This research is motivated by the recent IGS Ionosphere Working Group recommendation issued at the IGS 2010 Workshop held in Newcastle, UK. This recommendation encourages studies on the evaluation of the application of COSMIC radio occultation profiles for additional IGS global ionosphere map (GIM) validation. This is because the reliability of GIMs is crucial to many geodetic applications. On the other hand, radio occultation using GPS signals has been proven to be a promising technique to retrieve accurate profiles of the ionospheric electron density with high vertical resolution on a global scale. However, systematic validation work is still needed before using this powerful technique for sounding the ionosphere on a routine basis. In this paper, we analyze the properties of the ionospheric electron density profiling retrieved from COSMIC radio occultation measurements. A comparison of radio occultation data with groundbased measurements indicates that COSMIC profiles are usually in good agreement with ionosonde profiles, both in the F2 layer peak electron density and the bottom side of the profiles. For this comparison, ionograms recorded by European ionospheric stations (DIAS network) in 2008 were used.

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GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique

Cited by 145 publications

References 13 publications

Forecast impact experiment with a constellation of GPS radio occultation receivers

Forecast impact experiment with a constellation of GPS radio occultation receivers

The tropical tropopause inversion layer: variability and modulation by equatorial waves

Ionospheric electron density observed by FORMOSAT-3/COSMIC over the European region and validated by ionosonde data

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