Impacts of historical ozone changes on climate in GFDL-CM3
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1 Impacts of historical ozone changes on climate in GFDL-CM3 Larry Horowitz (GFDL) with: Vaishali Naik (GFDL), Pu Lin (CICS), and M. Daniel Schwarzkopf (GFDL)
2 WMO (2014) Figure ADM 5-1 1
3 Response of tropospheric climate to historical ozone and WMGHG changes Temperature (DJF) Zonal Wind (DJF) Strong polar stratospheric cooling Midlatitude jet shifts poleward Relative contributions of ozone and WMGHG? Polvani et al. (2011) 2
4 Ozone changes dominate temperature response Ozone only WMGHG only Ozone+WMGHG Polvani et al. (2011) 3
5 Ozone changes dominate jet shift Ozone only WMGHG only Ozone+WMGHG Polvani et al. (2011) 4
6 CM3 Coupled Climate Model AM3 Atmospheric Model Donner et al. (2011) Austin et al. (2013) Naik et al. (2013) Designed to address: Chemistry-climate feedbacks Stratospheretroposphere chemical and dynamical coupling (high model top) Aerosol-cloud interactions Cubed sphere dynamical core Putman and Lin (2007) 5
7 Latitude Stratospheric ozone distributions and trends are generally well simulated Ozone Column Development of Antarctic Ozone Hole N S TOMS 290 DU GFDL-CM3 N S GFDL-CM3 305 DU DU IGAC/SPARC * + OBS CMIP5 models Eyring et al., JGR (2013) 6
8 Stratospheric ozone and temperature respond strongly to volcanic eruptions Ozone Column Temperature Krakatau (1883) Santa Maria (1902) Agung (1963) El Chichón (1982) Pinatubo (1991) Low chlorine High chlorine Sign of ozone response to volcanic aerosols depends on atmospheric chlorine loading Post-volcanic warming and long-term cooling in stratosphere are well simulated by CM3 Austin et al., J.Clim. (2013); WMO (2014) 7
9 CM3 Historical Simulations (All Forcings) Temperature (DJF) Zonal Wind (DJF) Colored contours show difference present-day ( ) minus 1950s ( ) Relative contributions of ozone and WMGHG? 8
10 Ozone mixing ratio in CM3 (SON) SPARC Dataset (OBS) All Forcings Historical changes in ozone well-simulated by CM3
11 Ozone mixing ratio in CM3 (SON) Ozone only WMGHG only All Forcings Ozone only experiment includes changes in ODS concentrations and uses background (1860) volcanic aerosols
12 Zonal winds in CM3 (DJF) Ozone only WMGHG only All Forcings Circulation shifts more strongly in response to historical ozone depletion than to WMGHG increase 13
13 Surface winds in CM3 (DJF) Ozone only WMGHG only All Forcings Poleward shift in surface winds in response to both ozone depletion and WMGHG increase (non-linear) 14
14 Sea ice in CM3 (DJF) Ozone only WMGHG only All Forcings Stronger response of sea ice to ozone than to WMGHG 15
15 Sensitivity to model configuration Zonal winds (DJF) AM3 (48L) AM4 (63L) AM4 (32L) Atmosphere-only simulations with prescribed ozone change (2000 minus 1960) Weaker tropospheric jet response in AM4 32L 17
16 Sensitivity to model configuration Surface winds (DJF) AM3 (48L) AM4 (63L) AM4 (32L) Atmosphere-only simulations with prescribed ozone change (2000 minus 1960) Weaker surface wind shift in AM4 32L 18
17 Effective Radiative Forcing from Ozone Cloud Radiative Forcing at TOA (DJF) Compare response in CM3 Grise et al. (2013) 19
18 Effective Radiative Forcing from Ozone Net Clear-Sky Shortwave Flux at TOA (annual) AM3 (48L) AM4 (63L) AM4 (32L) Simulations with prescribed ozone change (2000 minus 1960) Strong clear-sky SW cooling over pole 20
19 Effective Radiative Forcing from Ozone Net Shortwave Flux at TOA (annual) AM3 (48L) AM4 (63L) AM4 (32L) Simulations with prescribed ozone change (2000 minus 1960) Strong cooling over pole, partially offset by SW mid-lat cloud warming 21
20 Effective Radiative Forcing from Ozone Net Radiative Flux at TOA (annual) AM3 (48L) AM4 (63L) AM4 (32L) Simulations with prescribed ozone change (2000 minus 1960) LW warming damps SW radiative effect 22
21 Conclusions Strong poleward shift of SH summer jet in response to ozone depletion in GFDL-CM3 Surface wind shift and intensification sensitive to model configuration (vertical resolution) Shortwave (direct+indirect) forcing damped by long-wave Sea ice decreases more strongly in response to historical ozone depletion than to WMGHG increase Caveat: Only one ensemble member (CM3 coupled runs) Only one model 23
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