On the relationship between the QBO/ENSO and atmospheric temperature using COSMIC radio occultation data
On the relationship between the QBO/ENSO and atmospheric temperature using COSMIC radio occultation data
复制标题
利用COSMIC射电掩星数据研究QBO/ENSO与大气温度的关系
DOI：
10.1016/j.jastp.2017.03.008
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发表时间：
2017
影响因子：
1.9
通讯作者：
Zhang Xiaohong
中科院分区：
文献类型：
--
作者：
Gao Pan;Xu Xiaohua;Zhang Xiaohong
本文利用全球定位系统（GPS）无线电掩星（RO）观测资料，研究了与厄尔尼诺-南方涛动（ENSO）和准两年振荡（QBO）有关的对流层和平流层高层大气温度异常的空间分布和垂直结构，电离层与气候（COSMIC）福尔摩沙卫星使命3使命，2006年7月至2014年2月。结果表明，在平流层低层17-30 km处，热带大气温度与ENSO之间存在负相关，滞后1-4个月，超前1个月。在中纬度带的对流层观测到异相温度变化，在平流层下部观测到同相行为。有趣的是，我们还发现，在北方半球的中纬度地区，从32公里到40公里，在1-3个月的滞后期间，存在显著的负相关。两半球中纬度地区的大气温度变化与准两年振荡密切相关。在副热带急流区上也有两个窄带，在两半球上QBO信号都很强，大致平行于赤道。最后，我们发展了一个新的鲁棒指数来描述ENSO和QBO信号的强度。
In this paper, the spatial patterns and vertical structure of atmospheric temperature anomalies, in both the tropics and the extratropical latitudes, associated with the El Niño-Southern Oscillation (ENSO) and quasi-biennial oscillation (QBO) in the upper troposphere and stratosphere are investigated using global positioning system (GPS) radio occultation (RO) measurements from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) Formosa Satellite Mission 3 mission from July 2006 to February 2014. We find that negative correlations between the atmospheric temperature in the tropics and ENSO are observed at 17–30 km in the lower stratosphere at a lag of 1–4 months and at a lead of 1 month. Out-of-phase temperature variation is observed in the troposphere over the mid-latitude band and in-phase behaviour is observed in the lower stratosphere. Interestingly, we also find that there is a significant negative correlation at a lag of 1–3 months from 32 km to 40 km in the mid-latitude region of the Northern Hemisphere. The atmospheric temperature variations over mid-latitude regions in both hemispheres are closely related to the QBO. There are also two narrow zones over the subtropical jet zone where the QBO signals are strong in both hemispheres, approximately parallel to the equator. Finally, we develop a new robust index to describe the strength of the ENSO and QBO signal.