Jadwiga 'Yaga' Richter
Research Focus FY08:
Gravity waves play an important role in the coupling of various atmospheric regions. Therefore, the study of gravity waves is a focal point of lower, middle, and upper atmospheric research, being of strong inter-disciplinary interest.
J. Richter has developed a new gravity wave parameterization for the Whole-Atmosphere Community Climate Model (WACCM). This parameterization replaces the old arbitrarily specified gravity wave source spectrum with a source oriented approach. The new parameterization explicitly treats gravity wave generation from fronts and convection. This parameterization provides more realistic spatial and temporal distribution of gravity wave sources. As a result, the simulation of the middle atmospheric climate in WACCM is improved as compared to the previous version of the model. The greatest improvement is seen in the improvement of variability and the improved frequency of Sudden Stratospheric Warmings.
J. Richter is exploring changes to the gravity wave parameterization and top lid in CAM to improve some of CAM's biases, in particular: the sea level pressure and surface stresses in the Northern Pacific.
Scientific Talks FY08:
- Effects of Changes in Gravity Wave Parameterization on the Troposphere and Lower Stratosphere (Boulder, CO USA, 02/2008)
- Gravity Waves in CAM3.5 (Breckenridge, CO USA, 06/2008)
- Source oriented GW parameterization in WACCM3 (Breckenridge, CO USA, 06/2008)
Publications FY08: (abstracts)
Richter, J. H., P. J. Rasch, 2008: Effects of convective momentum transport on the atmospheric circulation in the Community Atmosphere Model, Version 3. J. Climate, 21, 1487-1499, doi: 10.1175/2007JCLI1789.1.
Richter, J. H., F. Sassi, R. R. Garcia, K. Matthes, C. Fischer, 2008: Dynamics of the middle atmosphere as simulated by the Whole Atmosphere Community Climate Model, version 3 (WACCM3). J. Geophys. Res., 113, D08101, doi: 10.1029/2007JD009269.
Chang, L., S. Palo, M. Hagan, J. Richter, R. Garcia, D. Riggin, D. Fritts, 2008: Structure of the migrating diurnal tide in the Whole Atmosphere Community Climate Model (WACCM). Adv. Space Res., 41, 1397-1406, doi: 10.1016/j.asr.2007.03.035.