Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF5.414
IF 5-year value: 5.958
IF 5-year
5.958
CiteScore value: 9.7
CiteScore
9.7
SNIP value: 1.517
SNIP1.517
IPP value: 5.61
IPP5.61
SJR value: 2.601
SJR2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
index
191
h5-index value: 89
h5-index89
Preprints
https://doi.org/10.5194/acp-2019-1169
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1169
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  05 Mar 2020

05 Mar 2020

Review status
A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Quantifying climate feedbacks in the middle atmosphere using WACCM

Maartje Sanne Kuilman1, Qiong Zhang2, Ming Cai3, and Qin Wen1,4 Maartje Sanne Kuilman et al.
  • 1Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
  • 2Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
  • 3Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida, USA
  • 4Laboratory for Climate and Ocean-Atmosphere Studies (LaCOAS), Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China

Abstract. The importance of feedback processes in the middle atmosphere for surface and tropospheric climate is increasingly realized. To better understand feedback processes in response to a doubling of CO2 we use the climate feedback response analysis method (CFRAM). We examine the middle atmosphere response to CO2 doubling with respect to the pre-industrial state in the Whole Atmosphere Community Climate Model (WACCM). Globally, the simulated temperature decrease between 200 and 0.01 hPa (~ 12–80 km) is found to be −5.2 K in July and −5.5 K in January in WACCM. The CFRAM calculations show that the direct forcing of CO2 alone would lead to an even stronger cooling of approximately 9 K in the middle atmosphere in both July and January. This cooling is being mitigated by the combined effect of the different feedback processes.

The contribution from the ozone feedback causes a warming of approximately 1.5 K, mitigating the cooling due to changes in CO2. Changes in CO2 also lead to changes in the middle atmosphere dynamics. The changes in dynamics play a large role locally, especially above 0.1 hPa. Other feedback processes, which are known to be important in the tropospheric and surface climate, such as the water vapor, albedo and cloud feedbacks are of minor importance in the middle atmosphere,although some effects are seen in the stratosphere, mainly through the responses to sea surface temperature and sea ice changes. It should be noted that there is a relatively large error term associated with the current method in the middle atmosphere, which can be explained by the linearization in the method.

Maartje Sanne Kuilman et al.

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Maartje Sanne Kuilman et al.

Maartje Sanne Kuilman et al.

Viewed

Total article views: 221 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
168 40 13 221 12 11
  • HTML: 168
  • PDF: 40
  • XML: 13
  • Total: 221
  • BibTeX: 12
  • EndNote: 11
Views and downloads (calculated since 05 Mar 2020)
Cumulative views and downloads (calculated since 05 Mar 2020)

Viewed (geographical distribution)

Total article views: 288 (including HTML, PDF, and XML) Thereof 287 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 24 Sep 2020
Publications Copernicus
Download
Short summary
In this study, we quantify the temperature changes in the middle atmosphere due to different feedback processes using a relative new method. We have found that the change due to the increase in CO2 alone, without feedbacks, would be approximately −9 K in the stratosphere and mesosphere. The combined effect of the different feedbacks causes the atmosphere to cool less. The ozone feedback is the most important feedback process, while the cloud, water vapour and albedo are only of minor importance.
In this study, we quantify the temperature changes in the middle atmosphere due to different...
Citation
Altmetrics