2.
Model and Simulations.
1.
Motivation.
Changes in the Brewer-Dobson Circulation on WACCM4
Froila Mª Palmeiro (1), Natalia Calvo (1) and Rolando García (2)
(1) Dpto.
Fisica de la Tierra II, Universidad Complutense de Madrid, Madrid, Spain....
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2.
Model and Simulations.
1.
Motivation.
Changes in the Brewer-Dobson Circulation on WACCM4
Froila Mª Palmeiro (1), Natalia Calvo (1) and Rolando García (2)
(1) Dpto.
Fisica de la Tierra II, Universidad Complutense de Madrid, Madrid, Spain.
(2) Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA
BDC Trends RCP2.
6 BDC Trends RCP4.
5
WACCM4 simulates both branches of the BDC.
The deep branch and the shallow
branch with maximum upwelling located in the upper stratosphere (1 hPa~49 km)
and the lower stratosphere (100 hPa~16 km) respectively.
Maximum upwelling occurs in the summer hemisphere, specially for the deep
branch circulation (upper stratosphere) and the trend acts to increase the seasonal
asymmetries with the largest trends in the summer hemisphere.
In the lower
stratosphere the trends indicate less seasonality in the Northern Hemisphere
upwelling.
Trends in the BDC are proportional to GHG concentrati
Less
