中国科学院国家空间科学中心机构知识库
Advanced  
NSSC OpenIR  > 空间科学部  > 期刊论文
题名: Strong temperature gradients and vertical wind shear on MLT region associated to instability source at 23 degrees S
作者: Andrioli, V. F.; Batista, P. P.; Xu, Jiyao; Yang, Guotao; Wang Chi; Liu Zhengkuan
作者部门: 空间科学部
通讯作者: Andrioli, VF (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, Beijing, Peoples R China. ; Andrioli, VF (reprint author), Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil.
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2017
卷号: 122, 期号:4, 页码:4500-4511
收录类别: SCI
项目资助者: China-Brazil Joint Laboratory for Space Weather ; Chinese Academy of Science ; Programa de Nucleos de Excelencia-PRONEX [76.97.1079.00]
英文摘要: Na lidar temperature measurements were taken successfully from 2007 to 2009 in the mesopause region over SAo Jose dos Campos (23.1 degrees S, 45.9 degrees W). Strong gradients on these vertical temperature profiles are often observed. A simple theoretical study has shown that temperature gradient of at least -8 K/km is required concurrently with the typical tidal wind shear in order to generate dynamical instability in the MLT region. We have studied vertical shear in horizontal wind related to atmospheric tides, inferred by meteor radar, with the aim of analyzing instability occurrence. These wind measurements were taken from an all-sky meteor radar at Cachoeira Paulista (22.7 degrees S, 45 degrees W). Two years of simultaneous data, wind and temperature, were used in this analysis which represent 79days, totalizing 589h of simultaneous observations. We realize that the condition for the local Richardson number (Ri) dropping below the critical value of instability (Ri<0.25) is often reached in 98% of the analyzed cases. The mean probabilities for occurrence of convective and dynamical instabilities, in the altitude region between 82 and 98km, were observed to be about 3% and 17.5%, respectively. Additionally, vertical distribution of these probabilities has revealed a weak occurrence of dynamical instability around 90km, and this fact can be related to the double mesopause typically observed in this site.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5985
Appears in Collections:空间科学部_期刊论文

Files in This Item:
File Name/ File Size Content Type Version Access License
2017jgra53427.pdf(1866KB)期刊论文作者接受稿限制开放View 联系获取全文
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Andrioli, V. F.]'s Articles
[Batista, P. P.]'s Articles
[Xu, Jiyao]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Andrioli, V. F.]‘s Articles
[Batista, P. P.]‘s Articles
[Xu, Jiyao]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: 2017jgra53427.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2017  中国科学院国家空间科学中心 - Feedback
Powered by CSpace