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  • 1
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    Evaluation of Refractivity Profiles From Champ and SAC-C GPS Radio Occultation (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The CHAMP and SAC-C missions are the first missions to carry a second-generation 'Blackjack' GPS receiver. One of the new features of this receiver is its ability to sense the lower troposphere closer to the surface than the proof-of-concept GPS/MET 1995 experiment. Since their launch, CHAMP and SAC-C have collected thousands of GPS radio occultations, representing a wealth of measurements available for data assimilation in Numerical Weather Prediction (NWP) models. In order to evaluate the refractivity data derived by JPL from raw radio occultation measurements, we use Data Assimilation Office (DAO) shout forecasts as an independent state of the atmosphere. We compare CHAMP and SAC-C refractivity (processed by JPL) with refractivity calculated from the DAO global fields of temperature, water vapor content and humidity. We will show statistics of the differences as well as Probability Density Functions (PDFs) of the differences. Depending upon availability of AIRS data, we plan to show individual profile comparisons between GPS radio occultation and AIRS retrievals.
    Keywords: Aircraft Communications and Navigation
    Format: text
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  • 2
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    A High-Resolution, Three-Dimensional Model of Jupiter's Great Red Spot (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The turbulent flow at the periphery of the Great Red Spot (GRS) contains many fine-scale filamentary structures, while the more quiescent core, bounded by a narrow high- velocity ring, exhibits organized, possibly counterrotating, motion. Past studies have neither been able to capture this complexity nor adequately study the effect of vertical stratification L(sub R)(zeta) on the GRS. We present results from a series of high-resolution, three-dimensional simulations that advect the dynamical tracer, potential vorticity. The detailed flow is successfully captured with a characteristic value of L(sub R) approx. equals 2000 km, independent of the precise vertical stratification profile.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Paper-2000JE001287 , Journal of Geophysical Research (ISSN 0048-0227); 106; E3; 5099-5105
    Format: text
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  • 3
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    Evaluation of Refractivity Profiles from CHAMP and SAC-C GPS Radio Occultation (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The CHAMP and SAC-C missions are the first missions to carry a second-generation 'Blackjack' GPS receiver. One of the new features of this receiver is its ability to sense the lower troposphere closer to the surface than the proof-of-concept GPS/MET 1995 experiment. Since their launch, CHAMP and SAC-C have collected thousands of GPS radio occultations, representing a wealth of measurements available for data assimilation in Numerical Weather Prediction (NWP) models. In order to evaluate the refractivity data derived by JPL from raw radio occultation measurements, we use Data Assimilation Office (DAO) 6-hour forecasts as an independent state of the atmosphere. We compare CHAMP and SAC-C refractivity (processed by JPL) with refractivity calculated from the DAO global fields of temperature, water vapor content and humidity. We will show statistics of the differences as well as Probability Density Functions (PDFs) of the differences. Depending upon availability of AIRS data, we plan to show individual profile comparisons between GPS radio occultation and AIRS retrievals.
    Keywords: Geophysics
    Type: 1st International Workshop on Occultations for Probing Atmosphere and Climate; Sep 16, 2002 - Sep 20, 2002; Graz; Austria
    Format: text
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  • 4
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    Evaluation of Refractivity Profiles from CHAMP and SAC-C GPS Radio Occultation (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The GeoForschungsZentrum's Challenging Minisatellite Payload for Geophysical Research and Application (CHAMP, Germany-US) and the Comision Nacional de Actividades Especiales' Satelite de Aplicaciones Cientificas-C (SAC-C, Argentina-US) missions are the first missions to carry a second-generation Blackjack Global Positioning System (GPS) receiver. One of the new features of this receiver is its ability to sense the lower troposphere closer to the surface than the proof-of-concept GPS Meteorology experiment (GPS/MET). Since their launch, CHAMP and SAC-C have collected thousands of GPS radio occultations, representing a wealth of measurements available for data assimilation and Numerical Weather Prediction (NWP). In order to evaluate the refractivity data derived by the Jet Propulsion Laboratory (JPL) from raw radio occultation measurements, we use Data Assimilation Office (DAO) 6-hour forecasts as an independent state of the atmosphere. We compare CHAMP and SAC-C refractivity (processed by JPL) with refractivity calculated from the DAO global fields of temperature, water vapor content and humidity. We show statistics of the differences as well as histograms of the differences.
    Keywords: Geophysics
    Type: First International Workshop on Occultations for Probing Atmosphere & Climate (OPAC-1); Sep 16, 2002 - Sep 20, 2002; Graz; Austria
    Format: application/pdf
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  • 5
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    Thermal Structure of the TTL and Its Relation to Stratospheric-Tropospheric Exchange of Water (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This document describes the annual cycle of the trajectory track line (TTL) fine scale thermal structure as captured by global positioning system (GPS) radio occultation and the pressure levels of the East Meets West Foundation (EMWF) weather analysis. This annual cycle is compared to the annual cycle in water concentrations measured by the HALogen Occultation Experiment (HALOE). A comparison between saturation mixing ratios at the temperatures captured by GPS radio occultation and HALOE concentrations of water vapor shows an annual cycle that is dominated by supersaturation in the boreal winter months, when the upward mass fluxes are larger, and subsaturation in the summer. The longitudinal dependence of these cycles is discussed as well as the possible implications for the seasonality of stratospheric-troposheric exchanges of water.
    Keywords: Meteorology and Climatology
    Type: AGU A11-003 , The American Geophysical Union (AGU) Fall Meeting; Dec 13, 2004 - Dec 17, 2004; San Francisco, CA; United States
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  • 6
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    Sensitivity of Stratospheric Retrievals from Radio Occultations on Upper Boundary Conditions (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The main uncertainty in the stratospheric retrievals from GPS radio occultation (RO) measurements comes from the lack of reliable measurements in the upper stratosphere and above where the bending due to the neutral atmosphere is weak and residual ionospheric effects are strong. In this work, we quantify the bias and uncertainty of the refractivity and temperature retrievals due to different upper boundary strategies using a simulation study. We use lidar refractivity and temperature profiles as the input states in generating the synthetic occultations. Random noise levels commensurate with the CHAMP RO measurements are then added to the simulated data. Through this study, the sensitivity of stratospheric retrievals to upper boundary methods and parameters are examined. Such error characterizations are important prerequisites towards the effective use of GPS RO data in climate monitoring.
    Keywords: Meteorology and Climatology
    Type: 2nd International Workshop on Occultations for Probing Atmosphere and Climate (OPAC); Sep 13, 2004 - Sep 17, 2004; Graz; Austria
    Format: text
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