Interannual variability of mesopause zonal winds over Ascension Island: Coupling to the stratospheric QBO

Interannual variability of mesopause zonal winds over Ascension Island: Coupling to the stratospheric QBO
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阿森松岛中层顶纬向风的年际变化:与平流层 QBO 的耦合

DOI:
10.1002/2013jd020203
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发表时间:
2013
期刊:
Atmospheres
影响因子:
--
通讯作者:
De Wit R
De Wit R
中科院分区:
--
文献类型:
--
作者:
De Wit R

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2001年10月至2011年7月,位于Ascension(8°S,14°W)的SKiYMET流星雷达获得的纬向风测量结果已被用于研究流星消融高度(约78-100 km)的年际变化及其与平流层准两年振荡(QBO)的耦合。在整个观测期间,观测到了一个周期为27.5个月的上层中间层准两年振荡(MQBO)。在15-20 hPa,MQBO与平流层QBO(SQBO)是异相的,与70 hPa是同相的,而在40-50 hPa,长期中层纬向风与SQBO之间不存在显著的零时滞相关。在88 km处测得MQBO震级为4.1±0.7 m/s。在考虑的整个高度范围内,没有发现MQBO震级的显著变化。研究发现,MQBO信号主要在三月春分前后传播,尽管MQBO信号在一年中的大部分时间都存在,但在较低海拔地区也不太明显。没有观测证据表明,MQBO,约78-100公里之间,发挥了作用,在半球间的管道准16日波。
Zonal‐wind measurements obtained between October 2001 and July 2011 with the SKiYMET meteor radar located at Ascension Island (8°S, 14°W) have been used to study the interannual variability at meteor ablation altitudes (approximately 78–100 km) and its coupling to the stratospheric quasi‐biennial oscillation (QBO). An upper mesospheric QBO (MQBO) with a period of 27.5 months has been detected throughout the observational period. The MQBO is found to be out‐of‐phase with the stratospheric QBO (SQBO) at 15–20 hPa and in‐phase compared to 70 hPa, whereas no significant zero time‐lag correlation exists between the long‐term mesospheric zonal winds and the SQBO at 40–50 hPa. The MQBO magnitude is found to be 4.1±0.7 m/s at 88 km. No significant change in MQBO magnitude is found throughout the altitude range under consideration. It was found that the MQBO signal is mainly carried around the March equinox, although the MQBO signal is present throughout most of the year, although less pronounced, at the lower altitudes as well. No observational evidence was found that the MQBO, between approximately 78–100 km, plays a role in the interhemispheric ducting of the quasi‐16 day wave.
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