Japan Geoscience Union Meeting 2014

Presentation information

Print

Oral

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS21_30PM1] Stratospheric Processes And their Role in Climate

Wed. Apr 30, 2014 2:15 PM - 4:00 PM 313 (3F)

Convener:*Kazuyuki Miyazaki(Research Institute for Global Change, JAMSTEC), Masakazu Taguchi(Aichi University of Education), Yoshio Kawatani(Japan Agency for Marine-Earth Science and Technology), Kaoru Sato(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Chair:Kazuyuki Miyazaki(Research Institute for Global Change, JAMSTEC)

2:45 PM - 3:00 PM

[AAS21-16] Correlation between O3 and HCl in the lower stratosphere as observed by SMILES

*Takafumi SUGITA1, Yasuko KASAI2, Yukio TERAO1, Sachiko HAYASHIDA3, Hideo SAGAWA2, Makoto SUZUKI4, Masato SHIOTANI5 (1.NIES, 2.NICT, 3.Nara Women's Univ., 4.JAXA, 5.Kyoto Univ.)

Keywords:SMILES, ISS, ozone, chlorine

Ozone (O3) in the upper troposphere (UT) has an effect on radiative forcing. One of poorly constrained source of tropospheric O3 is the stratosphere. Marcy et al. (Science, 2004) have suggested that measurements of HCl in the UT can be used to calculate how much O3 was transported from the lower stratosphere (LS). Using the correlation between O3 and HCl in the LS, a fraction of the source of the stratosphere has been quantified from measurements in the UT. To perform such a study, it is important to establish the O3/HCl correlations in the LS. Here, we will present the O3/HCl correlations as observed by the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on board the International Space Station (ISS) (Kikuchi et al., JGR, 2010). We first focus on latitudes between 30oS and 66oS in periods of November 2009, February 2010, and April 2010, when SMILES mainly covered the Southern Hemisphere (S.H.). Both the slope and intercept of the O3/HCl correlation in the S.H. Feb. are larger than those in Nov. (outside the Antarctic vortex). This is probably due to mixing of air inside and outside the Antarctic vortex, where the enhanced HCl values were observed only inside the vortex (The break-up of the vortex occurred in Dec. 2009 in the LS). Then, hemispheric contrasts in spring and fall will also be presented. In the S.H. Nov. (late spring), the slope is larger than that in the N.H. Apr. (30-66oN). Also, in the S.H. Apr. (fall), the slope is larger than that in the N.H. Oct. (30-66oN). Although, the reason for these larger slopes in the S.H. is not known, the O3/HCl correlations obtained from SMILES give recent references for the mid to high latitude LS in both the hemispheres.