Member

KOHMA, Masashi Assistant Professor Atmospheric and Oceanic Science Group Office: Science Bldg. 1-821 E-mail: HP: http://www-aos.eps.s.u-tokyo.ac.jp/~kohmasa/en/
Research Field Middle atmosphere dynamics Current Research Polar stratospheric clouds (PSCs) and polar mesospheric clouds (PMCs) are unique clouds in the middle atmosphere. PSCs, which are observed in the low and middle stratosphere in the polar winter, play a primary role in the ozone depletion in the polar vortex in early spring. PMCs appear around the mesopause in the summer season. Previous studies reported an increase in occurrence frequency of PMCs, which is potentially connected to global climate change. I study the relation between atmospheric waves and the clouds in the polar region using various data including satellite observations and reanalysis data. Representative Publications 1. Kohma, M. and K. Sato (2019), A diagnostic equation for tendency of lapse-rate-tropopause heights and its application. J. Atmos. Sci., doi:10.1175/JAS-D-19-0054.1 2. Kohma, M., K. Sato, Y. Tomikawa, K. Nishimura, and T. Sato (2019), Estimate of turbulent energy dissipation rate from the VHF radar and radiosonde observations in the Antarctic. J. Geophys. Res., 124, doi:10.1002/2018JD029521 3. Kohma, M., and K. Sato (2014), Variability of upper tropospheric clouds in the polar region during stratospheric sudden warmings. J. Geophys. Res., 119, 10,100-10,113, doi:10.1002/2014JD021746

KOHMA, Masashi

Assistant Professor
Atmospheric and Oceanic Science Group

Office: Science Bldg. 1-821
E-mail:
HP: http://www-aos.eps.s.u-tokyo.ac.jp/~kohmasa/en/

Research Field

Middle atmosphere dynamics

Current Research

Polar stratospheric clouds (PSCs) and polar mesospheric clouds (PMCs) are unique clouds in the middle atmosphere. PSCs, which are observed in the low and middle stratosphere in the polar winter, play a primary role in the ozone depletion in the polar vortex in early spring. PMCs appear around the mesopause in the summer season. Previous studies reported an increase in occurrence frequency of PMCs, which is potentially connected to global climate change.
I study the relation between atmospheric waves and the clouds in the polar region using various data including satellite observations and reanalysis data.

Representative Publications

1. Kohma, M. and K. Sato (2019), A diagnostic equation for tendency of lapse-rate-tropopause heights and its application. J. Atmos. Sci., doi:10.1175/JAS-D-19-0054.1
2. Kohma, M., K. Sato, Y. Tomikawa, K. Nishimura, and T. Sato (2019), Estimate of turbulent energy dissipation rate from the VHF radar and radiosonde observations in the Antarctic. J. Geophys. Res., 124, doi:10.1002/2018JD029521
3. Kohma, M., and K. Sato (2014), Variability of upper tropospheric clouds in the polar region during stratospheric sudden warmings. J. Geophys. Res., 119, 10,100-10,113, doi:10.1002/2014JD021746