Simulation of the Effect of Water-vapor Increase on Temperature in the Stratosphere |
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| Authors: | BI Yun CHEN Yuejuan ZHOU Renjun YI Mingjian and DENG Shumei |
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| Institution: | School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,Anhui Institute of Meteorological Sciences, Hefei 230031 |
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| Abstract: | To analyze the mechanism by which water vapor increase leads to cooling in
the stratosphere, the effects of water-vapor increases on temperature in the
stratosphere were simulated using the two-dimensional, interactive chemical
dynamical radiative model (SOCRATES) of NCAR. The results indicate that
increases in stratospheric water vapor lead to stratospheric cooling, with
the extent of cooling increasing with height, and that cooling in the middle
stratosphere is stronger in Arctic regions. Analysis of the radiation
process showed that infrared radiative cooling by water vapor is a pivotal
factor in middle-lower stratospheric cooling. However, in the upper
stratosphere (above 45 km), infrared radiation is not a factor in cooling;
there, cooling is caused by the decreased solar radiative heating rate
resulting from ozone decrease due to increased stratospheric water vapor.
Dynamical cooling is important in the middle-upper stratosphere, and
dynamical feedback to temperature change is more distinct in the Northern
Hemisphere middle-high latitudes than in other regions and significantly
affects temperature and ozone in winter over Arctic regions. Increasing
stratospheric water vapor will strengthen ozone depletion through the
chemical process. However, ozone will increase in the middle stratosphere.
The change in ozone due to increasing water vapor has an important effect on
the stratospheric temperature change. |
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| Keywords: | stratospheric water vapor temperature numerical simulation SOCRATES model |
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