排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
The transports of dust are calculated using 3-dimensional(3-D)trajectory method for three cases of duststorms inthe terrain-following coordinate system,and the synoptic processes are also discussed for each case.The case of 17—20April 1980,a severe duststorm was associated with the rapid development of a cyclone over the Mongolia Plateau.Thedust moved from west to east across several deserts,formed a typical dust path in spring.The other two were weaker andthe dust was triggered by the strong wind behind the cold front from northwest or north.Because the vertical velocity isconsidered in 3-D trajectory analysis,trajectories calculated should better reveal the transport rule of the dust particlesand the results seem to be more consistent with the synoptic processes.The trajectory analysis on the 2-D isobaric sur-faces is simpler but can be used only in the conditions with weak vertical wind shear and weak vertical velocity.The dif-ference of trajectories at lower levels between two methods may be caused by the different treatment of orography. 相似文献
2.
黑龙江省漠河地区三月份气候情况举世瞩目的3月9日日全食即将来临,很多读者已准备届时前往我国北疆黑龙江省漠河地区去观赏这难得一见的大自然的壮观景象,大家都很关心北国3月的气候情况,这里我们就给大家作一简略的介绍。黑龙江省漠河位于北纬53.29度,东径1... 相似文献
3.
1