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WAVE-Flow INTERACTIONS IN THE ATMOSPHERIC low-frequency variation OF BLOCKING PATTERN

Acta meteorologica Sinica 2000年第4期14卷 442-458页

作者：高守亭朱文妹董敏 State Key Laboratory of Atmospheric Boundary Layer and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 Chinese Academy of Meteorological Sciences Beijing 100081 National Climate Center Beijing 100081

Through a simple review of low-frequency variation of blocking pattern and diagnoses of observational data and combining some experience in forecast practice,we put forward some thought about the mechanism of formation and maintenance of the blocking flow pattern from the synoptic/climatological point of view,It is emphasized that eastward moving and deepening of troughs in the upstream of the blocking high,the SST anomalies and topography effect are the main factors of impelling the variation of the blocking *** the maintenance of Ural blocking high wave-flow interactions are studied through disposition of baroclinic trough(transient wave)and the blocking *** study will offer a primary basis for the further theoretical study on the formation mechanism of the blocking high.

关键词： low-frequency variation blocking high wave-flow interaction

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Annual and interannual variations of sea-level anomaly in the Bay of Bengal and the Andaman Sea

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Acta Oceanologica Sinica 2007年第6期26卷 13-29页

作者： QIU Yun LI Li YU Weidong HU Jianyu State key laboratory of Marine Environmental Science College of Oceanography and Environmental Science Xiamen University Xiamen 361005 China Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China First Institute of Oceanography State Oceanic Administration Qinddao 266061 China

Annual and interannual variations of sea-level anomaly （SLA） in the Bay of Bengal and the Andaman Sea are investigated using altimeter - derived SLA data from 1993 to 2003. It is found that the SLA annual variation in the study area can be divided into three phases with distinctive patterns. During the southwest monsoon （May -September）, positive SLA presents in the equatorial region and extends northward along the eastern boundary of the bay, and the SLA distribution in the interior bay appears to be high in the east and low in the west with two cyclonic ceils developing in the north and south of the western bay respectively, between which an anticyclonic cell exists. During the early northeast monsoon （ October - December） , the whole bay is dominated by a large cyclonic cell with the pattern of high SLA in the east and low in the west still retained, and the SLA distribution outside the bay is changed in response to the reversal of the Indian Monsoon Current （IMC） in November. During the late northeast monsoon （January -April） , a large anticyclonic cell of SLA develops in the bay with negative SLA prevailing in the equatorial region and extending northward along the eastern boundary of bay. Therefore, the SLA distribution in the interior bay reverses to be high in the west and low in the east. It is suggested that the SLA annual variation in the bay is primarily driven by the local wind stress curl, involving Sverdrup balance while the abrupt SLA variation during the peak of northeast monsoon may be partly caused by the semiannual fluctuation of wind in the equatorial region. This fast adjustment in the interior bay is induced by the upwelling coastal Kelvin wave excited by the decay of Wyrtki jet during December through January. Besides the annual variation, in the bay, there are obvious SLA fluctuations with the periods of 2 and 3 - 7 a, which are driven by the interannual variability of large - scale wind field in the equatorial region. The coastal Kelvin wav

关键词： Bay of Bengal sea-level anomaly low-frequency variation satellite altimeter

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Numerical Experiments on the Impact of Spring North Pacific SSTA on NPO and Unusually Cool Summers in Northeast China

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Advances in Atmospheric Sciences 2014年第6期31卷 1305-1315页

作者： LIAN Yi ZHAO Bin SHEN Baizhu LI Shangfeng LIU Gang Laboratory of Research for Middle–High Latitude Circulation Systems and East Asian Monsoon Institute of Meteorological Sciences of Jilin Province National Meteorological Center Jilin Meteorological Science and Technology Service Center

A set of numerical experiments designed to analyze the oceanic forcing in spring show that the combined forcing of cold （warm） El Ni（n）o （La Ni（n）a） phases in the Ni（n）o4 region and sea surface temperature anomalies （SSTA） in the westerly drifts region would result in abnormally enhanced NorthEast Cold Vortex （NECV） activities in early *** spring,the central equatorial Pacific El Ni（n）o phase and westerly drift SSTA forcing would lead to the retreat of non-adiabatic waves,inducing elliptic low-frequency anomalies of tropical air *** would enhance the anomalous cyclone-anticyclonecyclone-anticyclone low-frequency wave train that propagates from the tropics to the extratropics and further to the mid-high latitudes,constituting a major physical mechanism that contributes to the early summer circulation anomalies in the subtropics and in the North Pacific mid-high *** central equatorial Pacific La Ni（n）a forcing in the spring would,on the one hand,induce teleconnection anomalies of high pressure from the Sea of Okhotsk to the Sea of Japan in early summer,and on the other hand indirectly trigger a positive low-frequency East Asia-Pacific teleconnection （EAP） wave train in the lower troposphere.

关键词： atmospheric model westerly drifts Ni(n)o4 SSTA low-frequency variation circulation pattern cool summer Northeast China

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自然内部变率对北半球极端高温低频振荡的影响（英文）

自然内部变率对北半球极端高温低频振荡的影响（英文）

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第35届中国气象学会年会

作者： Miaoni Gao Jing Yang Daoyi Gong Peijun Shi Zhangang Han Seong-Joong Kim School of Systems Science Beijing Normal University Academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs and Ministry of Education Faculty of Geographical Science Beijing Normal University State Key Laboratory of Earth Surface Processes and Resource Ecology (ESPRE) Faculty of Geographical Science Beijing Normal University Korea Polar Research Institute Division of Polar Climate Sciences

The frequency and intensity of extreme high temperature（EHT） in the northern hemisphere exhibit remarkable low-frequency（LF） variations in summer over the time period 1951-2017. Seven hotspots featuring both a high occurrence of EHT and large LF variations in EHT were identified in the northern hemisphere. The probability density functions show that the higher probabilities of the occurrence of EHT over these hotspots in recent decades are consistent with the shift in the mean temperature and an increased variance in the daily mean temperature. The common features of the LF variation in EHT frequency over all domains are a remarkable increasing trend and an evident decadal variations（DV）. The DV component makes the main contribution to the large LF variations. Further analysis shows that the DV over the six hotspots are the footprints of two dominant natural internal signals: the Atlantic Multi-decadal Oscillation（AMO） and the Inter-decadal Pacific Oscillation（IPO）. The coherent variation in temperature over western North America-Mexico, eastern Siberia, Europe, the Mongolian Plateau and southeastern China is significantly influenced by the AMO. The AMO contributes to the variations in temperature over the first four hotspots via its associated barotropic circum-global teleconnection, which imposes a striking anomalous pressure over these regions. The IPO governs the DV in temperature over the Indo-China Peninsula through an anomalous Walker circulation driven by the IPO-associated sea surface temperatures in the tropical Indian Ocean. The inconsistency between the in situ observations and the reanalysis datasets causes the uncertainty in the physical linkage between the natural internal variability and variations in EHT over southeastern China and the Indo-China Peninsula. This implies that natural internal forcing plays an important role in making hotspots more vulnerable to EHT.

关键词： Extreme high temperature low-frequency variation Decadal variation Atlantic Multi-decadal Oscillation Inter-decadal Pacific Oscillation

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