Troposphere‐Stratosphere Temperature Trends Derived From Satellite Data Compared With Ensemble Simulations From WACCM. Issue 18 (25th September 2017)

• Record Type: Journal Article
• Authors: Randel, William J.; Polvani, Lorenzo; Wu, Fei; Kinnison, Douglas E.; Zou, Cheng‐Zhi; Mears, Carl
• Is Part Of: Journal of geophysical research. Volume 122:Issue 18(2017)
• Page Start: 9651
• Page End: 9667
• Publication Date: 2017-09-25
• Subjects: temperature trends -- troposphere -- stratosphere -- WACCM; Atmospheric physics -- Periodicals; Geophysics -- Periodicals; 551.5
• DOI: 10.1002/2017JD027158
• Languages: English
• ISSNs: 2169-897X

Abstract

Abstract: Decadal‐scale trends in tropospheric and stratospheric temperatures derived from satellite measurements over 1979–2014 are compared with ensemble simulations from the Whole Atmosphere Community Climate Model (WACCM). The model is forced with observed sea surface temperatures, changes in greenhouse gases, and ozone‐depleting substances, plus solar and volcanic effects, and results from five WACCM realizations (with slightly different initial conditions) are analyzed. We focus on the vertical structure of tropospheric warming and stratospheric cooling increasing with height, the latitudinal and seasonal dependence of trends, and on the temporal evolution of stratospheric temperatures in response to stratospheric ozone depletion and partial recovery. The model captures the observed trend structure in most respects, and the ensemble of simulations provides quantitative estimates of the impact of internal variability on trend estimates. In regions of low variability (e.g., over low latitudes) the ensemble mean trends agree with the observations, while in regions of high variability (e.g., the polar stratosphere) the observations mostly fall within the range of realizations. Temperature response to evolving stratospheric ozone is evaluated by computing separate trends over 1979–1997 (ozone depletion) and 1998–2014 (partial recovery). Robust changes in temperature trends between these periods occur in the global upper stratosphere and in the Antarctic spring lower stratosphere, with consistent behavior between model and observations. Observed lower stratospheric temperatures in the Antarctic show statistically significant warming after 1998, reflecting recently reported healing of the ozone hole. Plain Language Summary: This work compares temperature trends during 1979–2014 measured by satellites with results from a state‐of‐the‐art chemistry‐climate model, incorporating observed forcings including observed sea surface temperatures and changes in greenhouse gases and ozone‐depleting substances, plus solar cycle and volcanic effects. We analyze an ensemble of five different model simulations (with slightly different initial conditions) to evaluate effects of internal climate variability on temperature trends. Temperature trends show good quantitative agreement between model and observations, including troposphere warming and stratosphere cooling increasing with altitude. This agreement demonstrates that the satellite‐observed temperature changes are a result of known forcings, both natural and anthropogenic. Stratospheric temperatures reflect the influence of stratospheric ozone depletion and partial recovery, with stronger cooling during the first half of the record. Satellite measurements identify a warming of the Antarctic lower stratosphere since 1998, as a response to the recently reported "healing" of the Antarctic ozone hole. Key Points: Satellite‐derived temperature trends over 1979–2014 agree well with the WACCM chemistry‐climate model Ensemble model simulations (five members) give quantitative estimates of internal variability for temperature trends Robust temperature response to stratospheric ozone depletion and partial recovery is found in observations and WACCM simulation