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circulation indices of the Aleutian Low Pressure System:Definitions and Relationships to Climate Anomalies in the Northern Hemisphere

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Advances in Atmospheric Sciences 2012年第5期29卷 1111-1118页

作者：王盘兴汪学良智海王玉坤孙晓娟 Ministry of Education Key Laboratory of Meteorological Disaster of Cooperation of Ministries and Provincial Governments and College of Atmospheric Sciences Nanjing University of Information Science and Technology Air Resources Laboratory National Oceanic and Atmospheric AdministrationSilver Spring

In this study, a group of indices were defined regarding intensity （P）, area （S） and central position （λc, Фc） of the Aleutian low （AL） in the Northern Hemisphere in winter, using seasonal and monthly mean height field at 1000-hPa. These indices were calculated over 60 winter seasons from 1948/1949 to 2007/2008 using reanalysis data. Climatic and anomalous characteristics of the AL were analyzed based on these indices and relationships between the AL, and general circulations were explored using correlations between indicesP, λc, and Pacific SST, as well as Northern Hemisphere temperature and precipitation. The main results are these：（1） AL is the strongest in January, when the center shifts to the south and west of its climatological position, and it is the weakest in December when the center shifts to the north and east. （2） AL intensity （P） is negatively correlated with its longitude （λc）： a deeper low occurs toward the east and a shallower low occurs toward the west. On a decadal scale, the AL has been persistently strong and has shifted eastward since the 1970s, but reversal signs have been observed in recent years. （3） The AL is stronger and is located toward the east during strong E1 Nifio winters and vice versa during strong La Nifia years; this tendency is particularly evident after 1975. The AL is also strongly correlated with SST in the North Pacific. It intensifies and moves eastward with negative SST anomalies, and it weakens and moves westward with positive SST anomalies. （4） Maps of significance correlation between AL intensity and Northern Hemisphere temperature and rainfall resemble the PNA teleconnection pattern in mid-latitudes in the North Pacific and across North America. The AL and the Mongolian High are two permanent atmospheric pressure systems adjacent to each other during boreal winter over the middle and high latitudes in the Northern Hemisphere, but their relationships with the E1 Nifio/La Nifia events and with temperature and precipitat

关键词： circulation indices the Aleutian Low definitions and relationships climate anomalies

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Definition and analysis of the circulation indices of polar vortex at 10 hPa in the Northern Hemisphere

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Research in Cold and Arid Regions 2009年第6期1卷 549-558页

作者： LiPing Li ShuXuan Guan PanXing Wang JuHui Ma College of Atmospheric Sciences Nanjing University of Information Science and Technology Nanfing 210044 China

A set of circulation indices are defined and calculated to characterize monthly mean polar vortex at 10 hPa geopotential height chart in the Northern Hemisphere,including area–(S),intensity–(P) and center position (λc,φc)–indices by use of 1948–2007 NCEP/NCAR 10 hPa monthly height *** indices series are used to investigate the seasonal variation and interannual anomaly of polar vortex,along with the relations with global warming,ozone anomaly and Arctic Oscillation (AO).The results show that (1) there is anticyclonic (cyclonic) from *** Aug.(from *** Mar.).The change of spring circulation pattern is slower than that of autumn.(2) S can be replaced by P due to the interannual synchronal variations of the intensity and area for polar *** interannual (interdecadal) variations of P are significant in Jan.(Jul.).(3) The anomalies of system center position in *** more evident than that in Jul.(4) The variations of mean temperature at mid-stratosphere in the vicinity of pole zone in *** different from that in Jul.,but they are synchronal with the corresponding P and not significant correlation with the trend of global ***,the relationship between P and total O3 in *** obvious.(5) There is so notable correlation between P and AO that P can represent AO.

关键词： polar vortex at 10 hPa circulation indices global warming ozone anomaly Arctic Oscillation

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Climatic variations of general atmospheric circulation,precipitation and river flow of the territory of Kazakhstan

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Research in Cold and Arid Regions 2013年第1期5卷 109-113页

作者： Vitaly Salnikov Galina Turulina Svetlana Polyakova Marat Moldahmetov Lyazzat Mahmudova Department of Meteorology and Hydrology Faculty of Geography and Environmental Sciences al-Faraby Kazakh National Uni- versity Almaty Kazakhstan

Methods of calculating the basic hydrological characteristics of a water resource assessment, as well as the planning and manage- ment of their long-term use are based upon the concept of stationarity of long-term flow fluctuations. However, data of researches by hydrologists and climatologists clearly indicate that there are long-period changes in the characteristics of precipitation and riv- er flow. This article discusses the variations of annual precipitation and fiver flow in the Ishim River Basin in Kazakhstan, based on the W, C and E classification developed by GY. Vangengeim who analyzed the long-term variability of anomalies by the num- ber of days with some form of atmospheric circulation. From this study, the largest anomaly of the macro-circulation processes was revealed, and a comparative analysis of the number of days with various forms of atmospheric circulation and precipitation anomalies was made. It was demonstrated that the nature of atmospheric circulation depends on the distribution of precipitation; however, precipitation is also highly dependent on local physiographic conditions. The analysis of anomalous precipitation during the maximum number of days of positive anomalies with various forms of atmospheric circulation was also carried out. This study presents some results t^om the preliminary analysis of annual river flow linked with forms of atmospheric circulation.

关键词： circulation indices circulation forms alrnospheric precipitation river flow annual drain circulation eras

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