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After writing a (borderline mediocre) Ph.D. thesis on the use of isentropic trajectories to diagnose vertical motion in the extratropical atmosphere, Rainer’s career started off on a high note when he used knowledge of “tropopause folds” to repeatedly position the NCAR propeller aircraft (a humble Queen Air) in stratospheric air for chemical measurements. Subsequently, he developed a strong interest in developing computer models of planetary circulation systems, his major focus being the use of a material (Lagrangian) vertical coordinate whose use, in principle, reduces 3-D fluid motion to 2-D motion. Early applications included an investigation of the role of potential vorticity in Alpine lee cyclogenesis. He received NCAR’s “paper of the year” award and a team award at that time.
A faculty position at the Rosenstiel School of Marine and Atmospheric Science at the University of Miami prompted him to engage in ocean modeling, emphasizing the use of sea water potential density as vertical model coordinate. For many years this work, which also involved colleagues and students, was supported by the National Science Foundation and the Office of Naval Research. Rainer’s signature achievement during that phase arguably was the design of a hybrid vertical coordinate combining the advantages of Lagrangian and Eulerian representations of geophysical fluid flow. These efforts culminated on the ocean side in the global HYCOM model (presently the main platform for real-time ocean prediction at the Naval Research Lab), and on the atmospheric side in the regional RUC and the global FIM model. The latter models were developed during visiting (later part-time) appointments at UC Boulder and NOAA where once again he was surrounded by competent colleagues.
While working at NASA’s Goddard Institute for Space Studies, Rainer oversaw the coupling of HYCOM to the GISS climate model, the main task being the design of a conservative interpolation device (”flux coupler”) for air-sea fluxes. This model combination became one of GISS’s contributions to the international Climate Model Intercomparison Project (CMIP5 and CMIP6).
A faculty position at the Rosenstiel School of Marine and Atmospheric Science at the University of Miami prompted him to engage in ocean modeling, emphasizing the use of sea water potential density as vertical model coordinate. For many years this work, which also involved colleagues and students, was supported by the National Science Foundation and the Office of Naval Research. Rainer’s signature achievement during that phase arguably was the design of a hybrid vertical coordinate combining the advantages of Lagrangian and Eulerian representations of geophysical fluid flow. These efforts culminated on the ocean side in the global HYCOM model (presently the main platform for real-time ocean prediction at the Naval Research Lab), and on the atmospheric side in the regional RUC and the global FIM model. The latter models were developed during visiting (later part-time) appointments at UC Boulder and NOAA where once again he was surrounded by competent colleagues.
While working at NASA’s Goddard Institute for Space Studies, Rainer oversaw the coupling of HYCOM to the GISS climate model, the main task being the design of a conservative interpolation device (”flux coupler”) for air-sea fluxes. This model combination became one of GISS’s contributions to the international Climate Model Intercomparison Project (CMIP5 and CMIP6).
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user-5fe1a78c4c775e6ec07359f9(2021)
EGU General Assembly Conference Abstractspp.2809, (2018)
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EGUGApp.11097, (2017)
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