The Climatic Characteristics Of Stratosphere Winds Observed By Rocket Sounding And Their Comparisons With HWM07 And CIRA86

Mean winds at 20-70 km altitudes observed with rocket sounding in Kwajalein Island(80N,1670E) are presented in this paper. The wind dates covered the period 1969-1972,which was selected from 1963-1992. We studied the quasi-biennial variation, annual varia-tion and semi-annual variation and compared with Horizontal Wind Model 2007(HWM07)and COSPAR International Reference Atmosphere 1986(CIRA86). The summer westward winds reached a peak value of 45 ms-1 in August at 41 km altitude. The winter eastward winds reached a peak value of 47 ms-1 in March at 57 km altitude. Below 60 km, the meridional wind basically was the northward, with the wind speed was less than 10 ms-1.At the 20-35 km altitudes, the zonal winds showed a clear quasi-biennial variation, with the amplitude in the range of 10-17 ms-1. At the 45-55 km altitudes, the zonal winds showed a clear semi-annual variation, with the amplitude in the range of 16-25 ms-1. At the 55-65 km altitudes, the zonal winds showed a clear annual variation, with the amplitude in the range of 16-25 ms-1. The observed features were compared with HWM07 and CIRA86.HWM07 westward winds reached with a peak value of 38 ms-1 in July at 47 km altitude.HWM07 eastward winds reached a peak value of 47 ms-1 in February at 66 km altitude.The maximum of HWM07 eastward winds was less than the peak value of the observed winds. CIRA86 westward winds reached a peak value of 46 ms-1 in July at 49 km altitude.CIRA86 eastward winds reached a peak value of 43 ms-1 in March at 64 km altitude. One of the reasons why observed winds speed are slightly larger than HWM07 and CIRA86 may be observed winds include the background winds and the various waves, while empirical winds model are average results of climatology. In addition, although HWM07 and CIRA86 contain a lot of rocket sounding dates, they do not include the observed wind dates in the Kwajalein Island. We also research long-term trends of stratosphere wind field of the at po-lar region. Mean winds data at 20-70 km altitudes observed with rocket sounding, covered the period 1965-1983, which was selected from 1963-1992 at the four stations Church(58°N,93°W), Greely(64°N, 145°W), Primrose(54°N, 110°W), Poker(65°N, 147°W). We use the data to analyze the solar influence on average wind field, the long-term trends of monthly mean wind and the long-term trends of annual average wind. The result show that the zonal wind is enhanced by increasing solar activity. In other words, westward is enhanced in summer and eastward is enhanced in winter at 20-70 km altitudes. The result of long-term trends of monthly mean wind show that the zonal wind field mainly is negative no mater in summer or winter. The result of long-term trends of monthly mean wind show that the trends is more obvious with the increase of height.