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51.
InternalGravityWavesGeneratedbyaLocalThermalSourceinanIrrotationalZonal-VerticalPlane:NumericalAnalysisZhangDaizhou(张代洲)(Cent... 相似文献
52.
All existing data (6 years) on gravity wave activity, inferred from the nighttime A3 (oblique incidence on the ionosphere) radio wave absorption measurements in the lower ionosphere on 270 kHz at Prhonice in Central Europe, have been exploited to get information on the effects of QBO phases and the Mt. Pinatubo volcanic eruption on the gravity wave activity in the winter half of the year. There appears to be an enhancement of gravity wave activity in the two winters just after the strong volcanic eruption of Mt. Pinatubo. This enhancement is remarkable for long-period waves (T=2–3 hours). No clear effect of the phase of QBO on the level of gravity wave activity has been found; a possible effect of QBO on the correlations between gravity wave activities in individual period bands is indicated. The results are limited by a relatively short data series; however, no more data will he available. 相似文献
53.
INTERRELATION BETWEEN EAST-ASIAN WINTER MONSOON AND INDIAN/PACIFIC SST WITH THE INTERDECADAL VARIATION* 下载免费PDF全文
Investigated statistically is the interrelation between East Asian winter monsoon (EAWM) and SST over sensitive areas of the Indian and Pacific Oceans.with focus on the relation of EAWM to strong ENSO signal area.i.e.,the equatorial eastern Pacific (EEP) SST.Evidence suggests that the EAWM variation is intimately associated not only with the EEP SST but with the equatorial western Pacific "warm pool" and equatorial Indian/northwestern Pacific Kuroshio SST as well:the EAWM and ENSO interact strongly with each other on the interannual time scales,exhibiting pronounced interdecadal variation mainly under the joint effect of the monsoon QBO and the monsoon/SST background field features on an interdecadal basis-when both fields are in the same phase(anti-phase).strong EAWM contributes to EEP SST rise(drop)in the following winter,corresponding to a warm(cold)ENSO cycle;the EAWM QBO causes ENSO cycle to be strong phase-locked with seasonal variation,making the EEP SST rise lasting from April-May to May-June of the next year,which plays an important role in maintaining a warm ENSO phase. 相似文献
54.
55.
ADVANCE IN STUDIES OF TROPOSPHERIC BIENNIAL OSCILLATION 总被引:3,自引:0,他引:3
There are obvious biennial phenomena of circulation, meteorological and climatic elements in
the troposphere, named as Tropospheric (Quasi-) Biennial Oscillation (TBO). Many phenomena of TBO are
discovered, such as variations of TBO in tropospheric temperature, pressure, winds field, monsoon and
subtropical high etc. The mechanism of TBO is explored and the results demonstrate that tropical ocean (the
Indian Ocean and the Pacific Ocean, mainly) and Stratospheric QBO play important roles in the TBO. In addition,
Eurasian snow cover and solar activity of 11yr period can affect TBO very possibly. 相似文献
56.
Inter-monthly to inter-decadal global variability of lower stratosphere temperature (LST) is studied in order to improve current
knowledge on its variability and trends, as well as natural and anthropogenic influences upon it. Principal Component Analysis
(PCA) with S-mode Varimax rotated PCA were used. The first seven components, which explain 70% of variance make it possible
to determine homogeneous LST behaviour zones with little overlap between areas, and practically no unclassified areas. Composite
time series, referred to as reference series, in the core of the subregions defined by each of the PCs, were calculated in
order to obtain the temporal patterns.
The equatorial-tropical zone and the subtropical area display warmings caused by the eruptions of El Chichon and Mt. Pinatubo
volcanoes as well as the strong influence of the Quasi-Biennial Oscillation (QBO) which leads to equatorial warming (cooling)
in the west (east) phase and cooling (warming) in subtropical latitudes. Only low latitudes show some kind of global teleconnection
between hemispheres. Significant correlation with several ocean/atmosphere index time-series like ENSO, Antarctic and Arctic
Oscillations (AAO, AO), Arctic Circumpolar Vortex was detected over latitudinally separate regions. Antarctic and Arctic ozone
hole values were contrasted with warming and cooling features registered in mid and high latitudes in both hemispheres.
The LST reference series exhibit a negative trend, commonly attributed to the increase in greenhouse gases that lead to a
warming of the troposphere and a cooling of the stratosphere, in all sub regions. The highest cooling rate of − 0.65 °C/ decade
is detected in the Gobi desert, and the lowest values of −0.1 °C/ decade over the NE of Canada and Greenland which indicates
the great longitudinal variability that the LST trends may present. The difference with other authors is mainly due to the
fact that results are based either on latitudinal averages or radiosonde data. 相似文献
57.
中部型ENSO和平流层准两年振荡对冬季北半球平流层臭氧的联合调制作用 总被引:1,自引:0,他引:1
利用观测和再分析资料通过合成分析方法,研究了中部型ENSO和平流层准两年振荡(QBO)对冬季北半球平流层臭氧的独立影响和联合调制作用。研究表明,北半球平流层臭氧在中部型厄尔尼诺年增加,而在中部型拉尼娜年减少;准两年振荡东风位相年份,北半球平流层臭氧增加,准两年振荡西风位相结果则相反。相比之下,北半球中、高纬度平流层臭氧异常对准两年振荡活动的响应明显小于其对ENSO活动的响应。进一步研究发现,准两年振荡东风位相会加强中部型厄尔尼诺事件引起的北半球平流层臭氧的增加,而减弱中部型拉尼娜事件造成的平流层臭氧的减少。在准两年振荡西风位相下,中部型厄尔尼诺事件仅导致北半球平流层臭氧含量少量升高,而中部型拉尼娜事件期间臭氧会大幅度减少。因此,准两年振荡东风位相会加强中部型厄尔尼诺事件对北半球平流层臭氧的影响,而减弱中部型拉尼娜事件对北半球平流层臭氧的影响。准两年振荡西风位相会减弱中部型厄尔尼诺而加强中部型拉尼娜事件对北半球平流层臭氧的影响。 相似文献
58.
1.IntroductionThelow~frequencyoscillation(LFO)isaveryimPOrtantweatherphenomenonintheatmosphere.The30--50--dayandquasichiweeklyoscillationsinthetropicalatmospherearemostintensivelystudied,andcomParativelyspeaking,anotherkindofLFOconcernillgtheQBOofthestratosphericzonalwindsismuchlessstudied,which,althoughoccurringinthestratosphere,bearsacloserelationtothetroposphericactivitiesandtheevolutionoflow--latitudecirculationssothatitisworthwhiletoexploreindepththephysicalmechanismfortheQBOoccurre… 相似文献
59.