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Contribution of the Sea Surface Temperature over the Mediterranean-Black Sea to the Decadal Shift of the summer north atlantic oscillation

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Advances in Atmospheric Sciences 2009年第4期26卷 717-726页

作者：孙建奇袁薇 Nansen-Zhu International Research Centre(NZC) Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center(CCRC) Chinese Academy of Sciences China Meteorological Administration Training Centre

Recent observational study has shown that the southern center of the summer north atlantic oscillation （SNAO） was located farther eastward after the late 1970s compared to before. In this study, the cause for this phenomenon is explored. The result shows that the eastward shift of the SNAO southern center after the late 1970s is related to the variability of the Mediterranean-Black Sea （MBS） SST. A warm MBS SST can heat and moisten its overlying atmosphere, consequently producing a negative sea level pressure （SLP） departure over the MBS region. Because the MBS SST is negatively correlated with the SNAO, the negative SLP departure can enhance the eastern part of the negative-phase of the SNAO southern center, consequently producing an eastward SNAO southern center shift. Similarly, a cold MBS SST produces an eastward positive-phase SNAO southern center shift. The reason for why the MBS SST has an impact on the SNAO after the late 1970s but why it is not the case beforehand is also discussed. It is found that this instable relationship is likely to be attributed to the change of the variability of the MBS SST on the decadal time-scale. In 1951 1975, the variability of the MBS SST is quite weak, but in 1978 2002, it becomes more active. The active SST can enhance the interaction between the sea and its overlying atmosphere, thus strengthening the connection between the MBS SST and the SNAO after the late 1970s. The above observational analysis results are further confirmed by sensitivity experiments.

关键词： summer north atlantic oscillation Mediterranean-Black Sea sea surface temperature decadal variability

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Enhancement of the summer north atlantic oscillation Influence on northern Hemisphere Air Temperature

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Advances in Atmospheric Sciences 2009年第6期26卷 1209-1214页

作者：袁薇孙建奇 China Meteorological Administration Training Centre Institute of Atmospheric Physics Chinese Academy of Sciences

This study investigates the relationship between the summer north atlantic oscillation （SNAO） and the simultaneous northern Hemisphere （NH） land surface air temperature （SAT） by using the Climate Research Unit （CRU） data. The results show that the SNAO is related to NH land SAT, but this linkage has varied on decadal timescales over the last 52 years, with a strong connection appearing after the late 1970s, but a weak connection before. The mechanism governing the relationship between the SNAO and NH land SAT is discussed based on the NCEP/NCAR reanalysis data. The results indicate that such a variable relationship may result from changes of the SNAO mode around the late 1970s. The SNAO pattern was centered mainly over the north atlantic before the late 1970s, and thus had a weak influence on the NH land SAT. But after the late 1970s, the SNAO pattern shifted eastward and its southern center was enhanced in magnitude and extent, which transported the SNAO signal to the north atlantic surrounding continents and even to central East Asia via an upper level wave train along the Asian jet.

关键词： summer north atlantic oscillation surface air temperature wave train

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维普期刊数据库

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Physical Mechanism of the Impacts of the Tropical atlantic Sea Surface Temperature on the Decadal Change of the summer north atlantic oscillation

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Atmospheric and Oceanic Science Letters 2013年第5期6卷 365-368页

作者： SUN Jian-Qi Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences

In this study,physical mechanism of the impacts of the tropical atlantic sea surface temperature(SST)on decadal change of the summer north atlantic oscillation(SNAO)was explored using an atmospheric general circulation model(AGCM)developed at the International Centre for Theoretical Physics(ICTP).The simulation results indicate that the decadal warming of the SST over the tropical atlantic after the late 1970s could have significantly enhanced the convection over the *** enhanced convection would have strengthened the local meridional circulation over the Eastern atlantic-north Africa-Western Europe region,exciting a meridional *** teleconnection might have brought the signal of the tropical atlantic SST to the Extratropics,consequently activating the variability of the eastern part of the SNAO southern center,which led to an eastward shift of the SNAO southern center around the late *** physical processes are highly consistent with the previous observations.

关键词： summer north atlantic oscillation tropical atlantic sea surface temperature teleconnection decadal change simulation

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Possible Impact of the summer north atlantic oscillation on Extreme Hot Events in China

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Atmospheric and Oceanic Science Letters 2012年第3期5卷 231-234页

作者： SUN Jian-Qi Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Science Beijing 100029 China

This paper reveals that the summer north atlantic oscillation (SNAO) is closely related to the extreme hot event (EHE) variability in China during the period of 1979 2009, with a positive-phase (negative-phase) SNAO corresponding to less (more) EHEs in northern China. The summer circulation anomalies associated with the SNAO give further confirmation of the above relationship. In a positive-phase (negative-phase) SNAO year, there is an anomalous cyclone (anticyclone) over central East Asia, which can increase (decrease) the total cloud cover over this region. Such changes of the total cloud cover can then decrease (increase) the solar radiation reaching the surface, which is consequently unfavorable (favorable) to the formation of EHEs over northern China.

关键词： summer north atlantic oscillation extreme hot events total cloud cover solar radiation

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