CAJ | 학술논문

利用NCEP／NCAR FNL客观分析资料和欧洲中期天气预报中心（ECMWF）的Interim 再分析资料以及臭氧监测仪（OMI）的臭氧廓线资料，结合区域大气化学模式 WRF-Chem 对中国春季一次高空冷槽过境引起的对流层顶折卷过程（2012年3月19—21日）进行了分析，并从平流、湍流混合、对流输送等几个方面诊断分析了平流层臭氧向对流层的传输特征和细节。结果表明，发生于青藏高原西北侧的对流层顶折卷事件，其所在位置处于热带对流层顶向中纬度对流层顶的过渡区，由于陡峭的对流层顶南北梯度，在该区域发生的平流层-对流层物质交换（STE）比对流层顶东西方向折卷引起的物质交换要强烈和持久，跨越等熵面的物质交换和湍流混合对平流层-对流层物质交换有很大的贡献。大地形对平流层-对流层物质交换过程有显著的影响，且具有明显的日变化特征。早晚时段，大地形导致的爬坡上升气流显著，抑制了平流层空气与对流层空气的混合交换。午后，大地形热力作用增强，受背风坡局地环流的影响，靠近山顶处湍流混合作用对上对流层臭氧浓度升高的贡献显著增强，且地形越高，这种效应越显著。地形的湍流混合作用在2．5 km高度以上凸显，此高度之上地形平均高度每升高100 m，湍流混合的贡献增加约1％。
이용NCEP／NCAR FNL객관분석자료화구주중기천기예보중심（ECMWF）적Interim 재분석자료이급취양감측의（OMI）적취양곽선자료，결합구역대기화학모식 WRF-Chem 대중국춘계일차고공랭조과경인기적대류층정절권과정（2012년3월19—21일）진행료분석，병종평류、단류혼합、대류수송등궤개방면진단분석료평류층취양향대류층적전수특정화세절。결과표명，발생우청장고원서북측적대류층정절권사건，기소재위치처우열대대류층정향중위도대류층정적과도구，유우두초적대류층정남북제도，재해구역발생적평류층-대류층물질교환（STE）비대류층정동서방향절권인기적물질교환요강렬화지구，과월등적면적물질교환화단류혼합대평류층-대류층물질교환유흔대적공헌。대지형대평류층-대류층물질교환과정유현저적영향，차구유명현적일변화특정。조만시단，대지형도치적파파상승기류현저，억제료평류층공기여대류층공기적혼합교환。오후，대지형열력작용증강，수배풍파국지배류적영향，고근산정처단류혼합작용대상대류층취양농도승고적공헌현저증강，차지형월고，저충효응월현저。지형적단류혼합작용재2．5 km고도이상철현，차고도지상지형평균고도매승고100 m，단류혼합적공헌증가약1％。
Using the NCEP/NCAR FNL data and the European Centre for Medium-Range Weather Forecasts (ECMWF)Inter-im data and the Ozone Monitoring Instrument (OMI)ozone profile data,together with a regional atmospheric chemical model (WRF-Chem),a tropopause folding event caused by a cold trough during 19-21 March 2012 was analyzed.The contributions of advection,turbulence mixing and convective transport processes to the transport of the stratospheric ozone to the tropo-sphere are diagnosed.The results show that the tropopause folding event occurred in the northwest side of the Tibetan Plateau is located in the transition zone between the tropical tropopause and the mid-latitude tropopause.Due to steep north-south gradi-ent of the tropopause,the stratosphere and troposphere exchange (STE)in this region is more persistent and stronger than that caused by the east-west tropopause folding.Mass exchange across the isentropic surface and the turbulent mixing have signifi-cant contributions to the STE.The higher orography has a significant influence on the STE processes with its effect having an evident diurnal variation.In the morning and evening time,the upward motions due to forcing lift of the high orography are strong and inhibit the mass exchange between stratosphere and troposphere.In the afternoon,the thermal effect of the high o-rography enhances,and the turbulent mixing near the top of the mountain leads to significant ozone increases in the upper trop-osphere with the development of local circulation on the leeward slope of the high orography,and,the higher the orography is the more significant this effect is.The height of the orography of 2.5 km is critical in term of the turbulent mixing.Above this height,the contribution of turbulent mixing to ozone change increases about 1% when the average height of the orography rises 100 m.