TY - GEN
AU - Peter Bauer
AU - G. Radnóti
AU - Sean Healy
AU - Carla Cardinali
AB - Observing system experiments within the operational ECMWF data assimilation framework have been performed for summer 2008 when the largest recorded number of GNSS radio occultation observations from both operational and experimental satellites has been available. Constellations with 0, 5, 33, 67, and 100% data volume were assimilated to quantify the sensitivity of analysis and forecast quality to radio occultation data volume. These observations mostly constrain upper tropospheric and stratospheric temperatures and correct an apparent model bias that changes sign across the upper troposphere - lower stratosphere. This correction effect does not saturate with increasing data volume, even if more data is assimilated than available in today's analyses. Another important function of radio occultation data, namely the anchoring of variational radiance bias corrections, is demonstrated in this study. This effect also does not saturate with increasing data volume. In the stratosphere, the anchoring by radio occultation data is stronger than provided by radiosonde and aircraft observations.
BT - ECMWF Technical Memoranda
DA - 02/2013
DO - 10.21957/je1yremu
LA - eng
M1 - 692
N2 - Observing system experiments within the operational ECMWF data assimilation framework have been performed for summer 2008 when the largest recorded number of GNSS radio occultation observations from both operational and experimental satellites has been available. Constellations with 0, 5, 33, 67, and 100% data volume were assimilated to quantify the sensitivity of analysis and forecast quality to radio occultation data volume. These observations mostly constrain upper tropospheric and stratospheric temperatures and correct an apparent model bias that changes sign across the upper troposphere - lower stratosphere. This correction effect does not saturate with increasing data volume, even if more data is assimilated than available in today's analyses. Another important function of radio occultation data, namely the anchoring of variational radiance bias corrections, is demonstrated in this study. This effect also does not saturate with increasing data volume. In the stratosphere, the anchoring by radio occultation data is stronger than provided by radiosonde and aircraft observations.
PB - ECMWF
PY - 2013
EP - 23
T2 - ECMWF Technical Memoranda
TI - GNSS radio occultation constellation observing system experiments
UR - https://www.ecmwf.int/node/7994
ER -