排序方式: 共有28条查询结果,搜索用时 15 毫秒
11.
2001年3月7日与8日在香港与昆明用电化学臭氧探空仪探测到了对流层低层异常的高浓度臭氧分布. 本文使用NCEP(美国环境预报中心)分析资料、中尺度数值模式MM5模拟的大气环流数据、卫星观测的东南亚地区的生物体燃烧状况、气溶胶指数等资料,分析了这段时间的天气形势、大气环流、空气的后向轨迹以及生物体燃烧产生的烟尘的轨迹,结果发现高浓度的臭氧空气来源于有生物体燃烧的中南半岛地区. 燃烧烟尘的轨迹还表明生物体燃烧地区的下风方的对流层低层臭氧的分布会受到上游地区生物体燃烧产物的影响. 相似文献
12.
Ozone chemistry processes are analyzed during a cumulus cloud process with the model(1CCCM)described in Part Ⅰ.The simulation results show that entire cumulus cloud process can bewell described with the development of vertical velocities and liquid water content which are the twomost outstanding features of cumulus clouds.Ozone chemistry is strongly influenced by cumulusclouds.NO_x can be transported upwards above 4 km in the first 20 minutes of the convection eventand form a relative higher concentration area which enhances the production of ozone.Two areas ap-pear during the convection event:area of net ozone production and area of net ozone depletion.Thearea of ozone depletion coincides with the area of liquid water within cloud.Results show that theaqueous phase(cloud water and rainwater)can alter gas ozone level through two ways:one is scav-enging free radicals(HO_2)from the gas phase and thereby inhibiting the reactions of transformationto NO_2 from NO,which results in reduction of the gas source of ozone;the other is aqueous phasechemical reactions which consume ozone in the aqueous phase.Calculations reveal that the reaction O_3+OH→HO_2 is the main pathway of ozone depletion in gas phase during the process of cumulusclouds. 相似文献
13.
2001年春季临安地区对流层臭氧异常增加的一次过程分析 总被引:6,自引:0,他引:6
2001年春季在临安(30.30°N,119.75°E)进行的臭氧垂直探测发现,从3月25到31日有一次明显的臭氧异常增加过程,其中尤以29日和30日对流层上层的臭氧异常增加最具代表性.结合分析地面及高空气象要素演变和高空位势涡度的变化表明,这是一次显著的平流层空气由上向下穿过对流层顶深入对流层的下传过程,此平流层对流层交换过程与冷空气南下的天气过程和副热带急流、极锋急流移动造成的辐合下沉运动有着密切的联系. 相似文献
14.
一次对流层异常臭氧次峰的观测研究及其动力输送过程的分析 总被引:4,自引:1,他引:4
文中分析了 1996年 8月 1日发生在西宁 (36 .4 3°N ,10 1.4 5°E ,海拔 :2 2 96m)地区对流层异常臭氧次峰现象。观测资料揭示了高空低压槽东移是臭氧次峰的主要天气特征。三维后向轨迹计算表明 ,尽管代表臭氧次峰的气团可以追溯到中亚地区 ,但是明显的气团向下输送则发生在新疆、青海间的高空低压槽内。中尺度模拟进一步确认了对流层顶折叠和平流层向下输送是臭氧次峰出现的动力机制。臭氧次峰在对流层高度位置与准无辐散层有关 相似文献
15.
16.
17.
A 2-D global chemistry-transport model is set up in this paper.The model simulates theatmospheric ozone distributions well with specified dynamical conditions.The analysis of ozonevariation mechanism shows that ozone is chemically in quasi-equilibrium except for the polar nightregion where the variation of ozone concentration is under the control of dynamical processes,thatthe oxygen atoms which produce ozone are mainly provided by the photolysis of O_2 in the upperstratosphere and by the photolysis of NO_2 in the lower stratosphere and the troposphere.and thatthe ozone is destroyed mainly by NO_x:the reactions between NO_x and O_3 and the odd oxygen cyclecontribute 80% to more than 90% of the ozone destruction. 相似文献
18.
19.
20.