Development of general circulation model with chemistry and studies on stratospheric material transport

点击翻译按钮获取中文摘要

Stratospheric ozone change and it's impact to climate change are studied, using General Circulation Models (GCMs). Main subjects are ;1) We investigate the mechanism of ozone change and climate impact including stratospheric chemical processes to GCMs.2) We investigate dynamical processes, transport processes, and relation to chemical processes using high resolution GCMs.Firstly, stratospheric aerosol processes are included in chemical GCMs. Then, stratospheric Sox chemistry and Sox budgets in the stratosphere are studied. Stratospheric Sox budgets are mainly determined by SO_2 in the troposphere, and transported to the stratosphere. After that, stratospheric aerosols are formed. Next, polar stratospheric clouds processes are included in chemical GCMs. Then, ozone hole experiments are done. Though ozone hole is simulated in the northern hemisphere, year to year variations are strong. Ozone hole is weak in other year, and ozone hole is strong in a year. Southern hemisphere ozone hole is also simulated, but stratospheric sudden warming and ozone hole breaking are not simulated. This is because the model has cooling bias in the polar stratosphere. Further, future ozone hole simulation is done. Ozone hole recovery in the southern hemisphere is about year 2040 in the model. This result is almost determined by fron loading.High resolution physical GCMs are developed. The model can simulate meso-scale phenomena. Baiu front, ITCZ, SPCZ are well simulated. High resolution GCMS also simulate gravity waves. Gravity waves are important in the stratosphere. Diurnal cycle gravity waves are well simulated in the equatorial lower stratosphere.