Browse > Article
http://dx.doi.org/10.14191/Atmos.2015.25.3.529

Optimization of the Vertical Localization Scale for GPS-RO Data Assimilation within KIAPS-LETKF System  

Jo, Youngsoon (Korea Institute of Atmospheric Prediction Systems)
Kang, Ji-Sun (Korea Institute of Atmospheric Prediction Systems)
Kwon, Hataek (Korea Polar Research Institute)
Publication Information
Atmosphere / v.25, no.3, 2015 , pp. 529-541 More about this Journal
Abstract
Korea Institute of Atmospheric Prediction System (KIAPS) has been developing a global numerial prediction model and data assimilation system. We has implemented LETKF (Local Ensemble Transform Kalman Filter, Hunt et al., 2007) data assimilation system to NCAR CAM-SE (National Center for Atmospheric Research Community Atmosphere Model with Spectral Element dynamical core, Dennis et al., 2012) that has cubed-sphere grid, known as the same grid system of KIAPS Integrated Model (KIM) now developing. In this study, we have assimilated Global Positioning System Radio Occultation (GPS-RO) bending angle measurements in addition to conventional data within ensemble-based data assimilation system. Before assimilating bending angle data, we performed a vertical unit conversion. The information of vertical localization for GPS-RO data is given by the unit of meter, but the vertical localization method in the LETKF system is based on pressure unit. Therefore, with a clever conversion of the vertical information, we have conducted experiments to search for the best vertical localization scale on GPS-RO data under the Observing System Simulation Experiments (OSSEs). As a result, we found the optimal setting of vertical localization for the GPS-RO bending angle data assimilation. We plan to apply the selected localization strategy to the LETKF system implemented to KIM which is expected to give better analysis of GPS-RO data assimilation due to much higher model top.
Keywords
GPS-RO bending angle; KIAPS-LETKF; vertical localization scale; OSSEs;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Anthes, R. A., 2011: Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather. Atmos. Meas. Tech., 4, 1077-1103, doi:10.5194/amt-4-1077-2011.   DOI
2 Anthes, R. A., C. Rocken, and Y.-H. Kuo, 2000: Applications of COSMIC to meteorology and climate. Terr. Atmos. Ocean. Sci., 11, 115-156.   DOI
3 Anthes, R. A., and Coauthors, 2008: The COSMIC/FORMOSAT-3 Mission: Early Results. Bull. Amer. Meteor. Soc., 89, 313-333.   DOI
4 Ho, S.-P., M. Goldberg, Y.-H. Kuo, C.-Z. Zou, and W. Schreiner, 2009a: Calibration of Temperature in the Lower Stratosphere from Microwave Measurements using COSMIC Radio Occultation Data: Preliminary Results. Terr. Atmos. Oceanic Sci., 20, doi:10.3319/TAO.2007.12.06.01(F3C).   DOI
5 Hunt, B. R., E. Kostelich, and I. Szunyogh, 2007: Efficient data assimilation for spatiotemporal chaos: A local ensemble transform Kalman filter. Physica D, 230, 112-126, doi:10.1016/j.physd.2006.11.008.   DOI
6 Jung, B.-J., J.-S. Kang, J. Kim, and Y. Jo, 2014: Preliminary result for KIAPS-LETKF system with real observations. Collection of abstracts for spring meeting of Korean Meteorological Society, 11-12.
7 Kang, J.-S., and J. Park, 2013: Development of KIAPS Ensemble Data Assimilation System. KIAPS Tech. Note., 2013.
8 Kang, J.-S., B.-J. Jung, H.-W. Jun, J.-H. Kim, S. Shin, Y. Jo, and H. Kwon, 2014: Progress and Plans of KIAPSLETKF:4D-LETKF, Radiance Data Assimilation, and Implementation to KIAPS-FM. Fall meeting of K Korean Meteorological Society, 10, 103-105.
9 Kuo, Y.-H., S. Sokolovskiy, R. A. Anthes, and F. Vandenberghe, 2000: Assimilation of GPS Radio Occultation Data for Numerical Weather Prediction. Terr. Atmos. Oceanic Sci., 11, 157-186.   DOI
10 Kursinski, E. R., G. A. Hajj, K. R. Hardy, J. T. Schofield, and R. Linfield, 1997: Observing Earth's atmosphere with radio occultation measurements using the global positioning system. J. Geophys. Res., 102, 23429-23465, doi:10.1029/97JD01569.   DOI
11 Kwon, H., J.-S. Kang, Y. Jo, and J. H. Kang, 2015: Implementation of a GPS-RO data processing system for the KIAPS-LETKF data assimilation system. Atmos. Meas. Tech., 8, 1259-1273.   DOI
12 Dennis, J. M., J. Edwards, K. J. Evans, O. Guba, P. H. Lauritzen, A. A. Mirin, A. St-Cyr, M. A. Taylor, and P. H. Worley, 2012: CAM-SE: A scalable spectral element dynamical core for the Community Atmosphere Model. Int. J. High Perform. Comput. Appl., 26, 74-89.   DOI
13 Anlauf, H., D. Pingel, and A. Rhodin, 2011: Assimilation of GPS radio occultation data at DWD. Atmos. Meas. Tech., 4, 1105-1113, doi:10.5194/mat-4-1105-2011.   DOI
14 Cucurull, L., and J. C. Derber, 2008: Operational implementation of COSMIC observations into NCEP's global data assimilation system. Wea. Forecast., 23, 702-711.   DOI
15 Cucurull, L., J. C. Derber, and R. J. Purser., 2013: A bending angle for- ward operator for global positioning system radio occultation measurements. J. Geophys. Res. Atmo., 118, 14-28.
16 Eyre, J. R., 1994: Assimilation of radio occultation measurements into a numerical weather prediction system. Technical Memo., No. 199, ECMWF, Reading, UK.
17 Healy, S. B., 2008: Assimilation of GPS radio occultation measurements at ECMWF, in: Proceedings of the GRAS SAF Workshop on Applications of GPSRO measurements, ECMWF, Reading, UK, 16-18 June 2008, 99-109.
18 Healy, S. B., 2014: Use of GPS-RO data in NWP at ECMWF 2D operators, in: Fifth EUMETSAT ROM SAF user workshop on Applications of GPS radio occultation measurements, ECMWF, Reading, UK, 16-18 June 2014.
19 Healy, S. B., and J. N. Thepaut, 2006: Assimilation experiments with CHAMP GPS radio occultation measurements. Quart. J. Roy. Meteor. Soc., 132, 605-623.   DOI
20 Loiselet, M., N. Stricker, R. Anthes, J. Chang, J.-H. Tseng, and B. Wang, 2000: GRAS-'Metop's GPS-based atmospheric sounder'. Bulletin 102, ESA, Darmstadt, Germany.
21 Matsmura, T., J. C. Derber, J. G. Yoe, F. Vandenberghe, and X. Zou, 1999: The inclusion of GPS limb sounding data into NCEP's Global Data Assimilation System. NOAA/NCEP Office Note 426, 76 pp.
22 Melbourne, W. G., E. S. Davis, C. B. Duncan, G. A. Hajj, K. R. Hardy, E. R. Kursinski, T. K. Meehan, L. E. Young, and T. P. Yunck, 1994: The application of spacebourne GPS to atmospheric limb sounding and global change monitoring. Jet Propulsion Laboratory, 147 pp.
23 Phinney, R. A., and D. L. Anderson, 1968: On the radio occultation method for studying planetary atmospheres. J. Geophys. Res., 73, 1819-1827.   DOI
24 Rennie, M. P., 2010: The impact of GPS radio occultation assimilation at the Met Office. Quart. J. Roy. Meteor. Soc., 136, 116-131, doi:10.1002/qj.521.   DOI
25 Szunyogh, I., E. J. Kostelich, G. Gyarmati, E. Kalnay, B. R. Hunt, E. Ott, E. Satterfield, and J. A. Yorke, 2008: A Local Ensemble Transform Kalman Filter data assimilation system for the NCEP global model. Tellus, 60A, 113-130.