CAJ | 학술논문

将区域海气耦合模式RegCM3-POM和区域气候模式RegCM3 40年(1963-2002年)的模拟结果与NCEP/NCAR再分析资料进行对比,检验区域海气耦合模式对中国华北地区夏季大气水汽含量和水汽输送特征的模拟能力,比较耦合模式与单独区域气候模式的差异.结果表明,区域海气耦合模式RegCM3-POM的模拟性能相对于单独区域气候模式RegCM3,大气水汽输送特征的模拟能力有了较大的改进.分析显示两种模式都能够较好地再现东哑地区气候平均夏季大气水汽储量浅红和水汽输送的空间分布特征,而耦合模式对大气水汽输送的模拟更为合理.在对流层中低层更接近观测;耦合模式对中国华北地区夏季平均大气水汽输送通量在垂直方向卜的分布型及水平4个边界水汽输送收支的模拟,相对于单独大气模式有了一定的改进;耦合模式对伴随华北地区夏季早涝的大气水汽异常输送也具有较好的模拟能力,其模拟的水汽输送异常的来源与观测基本一致,尤其是在20°N以北地区,耦合模式结果相对于单独区域气候模式有了很大的改进.但同时耦合模式在低纬度海洋上对气候平均夏季大气水汽含量模拟的偏差比区域气候模式显著;与观测相比,耦合模式对来自孟加拉湾地区的大气水汽输送模拟偏弱,而对西太平洋副热带高压西侧水汽输送模拟偏强,与华北夏季旱涝相联系的水汽输送异常的模拟在低纬度海洋上也存在明显偏差.
장구역해기우합모식RegCM3-POM화구역기후모식RegCM3 40년(1963-2002년)적모의결과여NCEP/NCAR재분석자료진행대비,검험구역해기우합모식대중국화북지구하계대기수기함량화수기수송특정적모의능력,비교우합모식여단독구역기후모식적차이.결과표명,구역해기우합모식RegCM3-POM적모의성능상대우단독구역기후모식RegCM3,대기수기수송특정적모의능력유료교대적개진.분석현시량충모식도능구교호지재현동아지구기후평균하계대기수기저량천홍화수기수송적공간분포특정,이우합모식대대기수기수송적모의경위합리.재대류층중저층경접근관측;우합모식대중국화북지구하계평균대기수기수송통량재수직방향복적분포형급수평4개변계수기수송수지적모의,상대우단독대기모식유료일정적개진;우합모식대반수화북지구하계조로적대기수기이상수송야구유교호적모의능력,기모의적수기수송이상적래원여관측기본일치,우기시재20°N이북지구,우합모식결과상대우단독구역기후모식유료흔대적개진.단동시우합모식재저위도해양상대기후평균하계대기수기함량모의적편차비구역기후모식현저;여관측상비,우합모식대래자맹가랍만지구적대기수기수송모의편약,이대서태평양부열대고압서측수기수송모의편강,여화북하계한로상련계적수기수송이상적모의재저위도해양상야존재명현편차.
Evaluation on simulation of the summer time atmospheric water vapor transport and the precipitable water over North China is carried out by using a regional air-sea coupled model RegCM3-POM and its comparison with the NCEP/NCAR reanalysis data set. The difference between the regional air-sea coupled model and the regional climate model is also investigated. The results show that, RegCM3-POM has a considerable improvement on the simulation of the atmospheric water vapor transport compared with RegCM3. Both of the regional air-sea coupled model and the regional climate model can reproduce the climatological distribution of summertime precipitable water and atmospheric water vapor transport over East Asia. The simulation of the regional air-sea coupled model is more reasonable and closer to the observation in the lower and middle troposphere, compared with that of the regional climate model. The climatological characteristics of atmospheric water vapor transport in the vertical profile and its horizontal budget over four boundaries of North China are more reasonable in the coupled model than those in the uncoupled model. The anomalous distribution of atmospheric water vapor transport associated with anomalous summer rainfall over North China is also reproduced in the regional air-sea coupled model. The sources of anomalous atmospheric water vapor transport in the regional air-sea coupled model are basically in agreement with the observation. The results of the regional air-sea coupled model is dramatically improved compared with those of the regional climate model, especially in the region north of 20°N. However, it is noticeable that the bias of the climatological summertime precipitable water over the low latitude oceanic region in the regional air-sea coupled model is larger than that in the regional climate model. Compared with the observation, the simulation of the atmospheric water vapor transport from the Bay of Bengal is weaker, and the atmospheric water vapor transport along the western part of the Western Pacific subtropical high is stronger in the regional air-sea coupled model. The anomalous distribution of atmospheric water vapor transport associated with anomalous summer rainfall over North China also has a conspicuous bias over the low latitude oceanic region in the regional air-sea coupled model RegCM3-POM.