欧洲上空 60 年标准相位高度测量得出的中间层长期振荡和趋势:更新

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Mani Sivakandan, Dieter H.W. Peters, Günter Entzian
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引用次数: 0

摘要

标准相位高度(SPH)和等离子尺度高度(PSH)的时间序列是根据阿卢瓦广播站(法国,162 kHz)60 年的长电波测量结果更新的。对 SPH 序列的统计分析显示,总体趋势显著,每十年下降 116 米,表明长电波反射高度下沉了约 700 米。考虑到平流层顶高度趋势(-70 米/十年),西欧上空的中间层总体上缩小了约 300 米。类似太阳周期和厄尔尼诺/南方涛动(-QBO)的带通显示,直到 1987 年,SPH 都在不断增加,之后则有所减少。我们发现,由于太阳周期24较弱,太阳周期带的振幅明显减小,但厄尔尼诺/南方涛动带的振幅却增大了。在太阳最小年的夏季月份,在没有平流层顶高度趋势的情况下,中间层温度厚度趋势显著,趋势值为-0.47 ± 0.43 K/十年。排除了太阳长期变率和平流层顶高度趋势,以确定更切合实际的中间层固有厚度温度趋势。在 60 年的观测过程中,中间层固有温度的总体降温幅度约为 3 K。为了确定中间层固有温度趋势,必须排除包括上一个太阳周期最大值递减在内的长期太阳变率和平流层顶高度趋势,而中间层固有温度趋势可能是由中层大气温室气体增加引起的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Long-term oscillations and trends of the mesosphere derived from 60 Years of standard phase-heights measurements over Europe: An update

The time series of standard phase-height (SPH) and plasma scale-height (PSH) have been updated from a 60-year long-radio-wave measurement of the broadcasting station Allouis (France, 162 kHz). The signal was received at Kühlungsborn (54° N, 12° E, Mecklenburg, Northern Germany).

The statistical analysis of the SPH series shows a significant overall trend with a decrease of 116 m/decade indicating a subsidence of the long-radio wave reflection height of about 700 m. With consideration of a stratopause altitude trend (-70 m/decade) follows an overall mesospheric shrinking of about 300 m over Western Europe.

As expected the time series of SPH shows in its spectrum dominant modes which are typical for the solar cycle, ENSO and for QBO bands indicating solar and lower atmospheric influences. Solar cycle and ENSO (-QBO)-like band-pass show a growing increase of SPH up to 1987, followed by a decrease afterward. We found a strong reduction in the amplitude of the solar cycle band due to the weak solar cycle 24, but an increase in the ENSO band.

For summer months during solar minimum years, and without stratopause altitude trend, a thickness temperature trend of the mesosphere is significant with a trend value of −0.47 ± 0.43 K/decade. The long-term solar variability and the stratopause altitude trend were excluded to determine a more realistic intrinsic mesospheric thickness temperature trend. The overall cooling of the intrinsic mesospheric temperature during 60 years of observation is in the order of 3 K.

The long-term solar variability including the decreasing maximum of last solar cycle, and the stratopause altitude trend have to be excluded in order to determine an intrinsic mesospheric temperature trend, which may be caused by greenhouse gas increase in the middle atmosphere.

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来源期刊
Journal of Atmospheric and Solar-Terrestrial Physics
Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理
CiteScore
4.10
自引率
5.30%
发文量
95
审稿时长
6 months
期刊介绍: The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.
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