HR: 1340h
AN: A13E-1611    [Abstracts]
TI: Relationship Between the Northern Hemisphere Polar Vortext ,North Pacific Storm Track and the West Wind Drift
AU: * Lian, Y
EM: lianyi1103@sina.com
AF: Laboratory of Research for Middle-high latitude Circulation and East Asian Monsoon, 6236 Xi'an Road£¬Changchun£¬Jilin Province,China, Changchun, 130062, China
AU: * Lian, Y
EM: lianyi1103@sina.com
AF: Jilin Meteorological Science Institute, 6236 Xian Road£¬Changchun£¬Jilin Province,China, Changchun, 130062, China
AU: Li, S
EM: icefsl@yahoo.com.cn
AF: Laboratory of Research for Middle-high latitude Circulation and East Asian Monsoon, 6236 Xi'an Road£¬Changchun£¬Jilin Province,China, Changchun, 130062, China
AU: Li, S
EM: icefsl@yahoo.com.cn
AF: Jilin Meteorological Science Institute, 6236 Xian Road£¬Changchun£¬Jilin Province,China, Changchun, 130062, China
AU: Liu, Z
EM: liuzongxiu@sina.com
AF: Chinese Meteorological Society, 46 South street,Haiding district£¬Zhongguancun,Beijing,China, Beijing, 100081, China
AU: Shen, B
EM: jlqys@sina.com
AF: Laboratory of Research for Middle-high latitude Circulation and East Asian Monsoon, 6236 Xi'an Road£¬Changchun£¬Jilin Province,China, Changchun, 130062, China
AU: Shen, B
EM: jlqys@sina.com
AF: Jilin Meteorological Science Institute, 6236 Xian Road£¬Changchun£¬Jilin Province,China, Changchun, 130062, China
AU: Yang, Q
EM: yqoo1@sina.com
AF: The observatory of Dandong, 6236 Xi'an Road£¬Changchun£¬Jilin Province,China, Dandong, 118000, China
AB: Abstract: For this study, we use the daily and the monthly data from the National Centers for Environmental Prediction- National Centers for Atmospheric Research(NCEP-NCAR) reanalysis. In addition, we employ the monthly sea surface temperature data and the area index of the polar vortex in the Pacific sector from Beijing Climate Center. The time of the data set covers from 1951 to 2002.We study the relationship between the polar area in the northern hemisphere and the sea surface temperature in the west wind drift( we also do the same work between the storm track and the polar area) in the spring, the result shows that: (1) In the Pacific sector (150° E - 120° W), there is obvious negative correlation between the area index of the polar vortex and the index of sea surface temperature in west wind drift area in spring. Moreover, we also find the same phenomenon between the Pacific sector polar vortex area index and the storm track in the spring. With respect to the definition of the storm track index and the index of the west wind drift area sea surface temperature, we will give some explanation at the end of the paper. (2)By using the M-K(Mann-Kendall) test method, we found that the spring polar area index in the Pacific sector and the spring storm track index all have an abrupt change in 1969. The value of the spring polar area index is smaller than that of the average throughout the 1950s and 1960's,but during the 1970s and 1980s it is on the contrary. Analysing the index variety we can conclude that the location of the Pacific storm track is more northward throughout the 1950's and 1960's but more southward during the 1970s and 1980s.Using the M-K(Mann-Kendall) test method ,we also found the spring index of the sea surface temperature in the west wind drift area have an abrupt change in 1973.It means that the sea surface temperature of the west wind drift is colder during the 1950s and 1960's,but during the 1970s and 1980s it is warmer. (3)During the 1950s and 1960s,there is a negative anomalies of geopotential height cincture zone in the subtropical area from India to north America in the Northern Hemisphere，but during the 1970s and 1980s the negative anomalies replaced by the positive anomalies in the same zone, what is more, this distribution of the anomalies is persistence from spring to summer not only throughout the 1950s and 1960s but also throughout the 1970s and 1980s. While in America the anomalies pattern show as northeast negative and southwest positive from Canada to America ,which cause the America continent climate shows different character, compared the 1950s and 1960s to the 1970s and 1980s.In the East Asian, during the 1970s and 1980s,the location of the subtropical high is more eastward and more southward ,so the summer monsoon is obviously weaker than the 1950s and 1960s.
DE: 1620 Climate dynamics (0429, 3309)
DE: 1635 Oceans (1616, 3305, 4215, 4513)
DE: 1704 Atmospheric sciences
DE: 1833 Hydroclimatology
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting