HRDI observations of mean meridional winds at solstice
HRDI observations of mean meridional winds at solstice
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HRDI 至日平均经向风观测
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
T. Tsuda
中科院分区：
文献类型：
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作者：
R. Lieberman;W. Robinson;S. Franke;R. Vincent;J. Isler;D. Fritts;A. Manson;C. Meek;G. Fraser;A. Fahrutdinova;W. Hocking;T. Thayaparan;J. MacDougall;K. Igarashi;Takuji Nakamura;T. Tsuda
摘要利用高分辨率多普勒成像仪（HRDI）观测的95公里高空白天和夜间风场，推求了6个至日期间的欧拉平均纬向风场。这些估计进行了比较，与季节性平均雷达纬向风和动力学和经验风模型的结果。在地球仪的大部分地区，HRDI的平均纬向风是从夏季极点向冬季极点方向传播的。最大的向赤道风约为15 m s−1，通常出现在30°附近的夏季半球。向赤道风的局部最小值经常在这个纬度的两极观察到，风接近零或反向。在同期雷达风中也可以看到类似的结构。这种行为不同于模式预测的剩余纬向风模式。这种差异可能与重力波参数化有关，也可能是行星波影响的结果。
Abstract High Resolution Doppler Imager (HRDI) measurements of daytime and nighttime winds at 95 km are used to deduce seasonally averaged Eulerian mean meridional winds during six solstice periods. These estimates are compared with seasonally averaged radar meridional winds and with results from dynamical and empirical wind models. HRDI mean meridional winds are directed from the summer pole toward the winter pole over much of the globe. Peak equatorward winds of about 15 m s−1 are usually observed in the summer hemisphere near 30°. A local minimum in the equatorward winds is often observed poleward of this latitude, with winds approaching zero or reversing direction. A similar structure is seen in contemporaneous radar winds. This behavior differs from residual meridional wind patterns predicted by models. The discrepancies may be related to gravity wave paramaterizations or a consequence of planetary wave influences.