HR: 18:05h
AN: A54A-08    [Abstracts]
TI: Variations in the lower stratospheric polar temperature in winter and spring associated with eddy heat flux
AU: * Choi, W
EM: wchoi@snu.ac.kr
AF: Seoul National University, School of Earth and Env Sci College of Natural Scie, Seoul, 151-747, Korea, Republic of
AU: Kim, D
EM: djkim96@snu.ac.kr
AF: Seoul National University, School of Earth and Env Sci College of Natural Scie, Seoul, 151-747, Korea, Republic of
AB: The lower-stratospheric polar temperatures and the eddy heat fluxes in winter and spring for the past 50 years were investigated based on NCEP/NCAR, ERA40 reanalysis data and a GCM run. Characteristic features of polar temperature in both Arctic and Antarctic stratosphere are described. The monthly mean polar temperatures at 70 hPa in January, February and March are compared with the eddy heat fluxes at 70 hPa averaged for the preceding two months, respectively. The eddy heat flux is divided into its stationary and transient components. Year-to-year variations of the polar temperature at 70 hPa are correlated with those of the stationary eddy heat flux in both mid- winter and early spring. However, the decadal components of polar temperature and eddy heat flux show different patterns. Examining the stationary and transient eddy heat fluxes separately, we show that the polar temperature variation in January is correlated with the stationary eddy heat flux from November 15 to January 15, whereas polar temperature in March is correlated with the transient eddies from January 15 to March 15. The variance of the stationary and transient eddies are also investigated for decadal and year-to-year components during winter and spring.
DE: 0342 Middle atmosphere: energy deposition (3334)
DE: 0399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly