One rainstorm over the North Pacific is studied and compared to a single dynamic fluid flow equation in order to see what measure of agreement might occur. Meteorological data for the rain storm come from the bridge o...One rainstorm over the North Pacific is studied and compared to a single dynamic fluid flow equation in order to see what measure of agreement might occur. Meteorological data for the rain storm come from the bridge of an oceanographic ship that sailed from San Diego to Japan along 35°N in the spring of 1976 [1]. A single dynamic equation origi-nated from combining Bernoulli’s law with the geostrophic relation and eliminating the pressure between them [2]: horizontal wind shear equals the Coriolis parameter. Wind speed measured on the ship every two hours is used to compute the mean wind shear over the 48 hours of the rain storm. That shear has the right sign and order of magnitude to agree with the Coriolis parameter at 35°N.展开更多
Sea level across the wide warm northeastward current off California is calculated from hydrographic data along 35N using the hydrostatic balance and the assumption that the warm mixed layer water floats on the colder ...Sea level across the wide warm northeastward current off California is calculated from hydrographic data along 35N using the hydrostatic balance and the assumption that the warm mixed layer water floats on the colder stratified water underneath. It is found that the sea level is higher above the warm water by a maximum of 7 cm in the middle of the flow. However, the mean east/west slope of the sea surface is deduced to be too small to balance the Coriolis force on the northward current. Therefore, geostrophy, as it is usually understood, is not operating strictly within the surface layer itself.展开更多
A genuine geostrophic small amplitude wave solution is deduced for the first time from the general form of linear fluid dynamic equations with the f-plane approximation, where the horizontal component of angular veloc...A genuine geostrophic small amplitude wave solution is deduced for the first time from the general form of linear fluid dynamic equations with the f-plane approximation, where the horizontal component of angular velocity of the earth rotation is taken into account. The Coriolis- induced stress obtained from this solution consists of lateral and reverse component, while its first order approximation is reduced to the result of Hasselmann or Xu Zhigang. Accordingly, combining the Coriolis-induced wave stress with the virtual wave stress proposed by Longuet-Higgins, the ratio of total wave-induced stress to wind stress on the sea surface is es- timated, through which the importance of the wave-induced stress is emphasized in the study of the currents in the seas around China, especially in the Bohai Sea and the Yellow Sea.展开更多
文摘One rainstorm over the North Pacific is studied and compared to a single dynamic fluid flow equation in order to see what measure of agreement might occur. Meteorological data for the rain storm come from the bridge of an oceanographic ship that sailed from San Diego to Japan along 35°N in the spring of 1976 [1]. A single dynamic equation origi-nated from combining Bernoulli’s law with the geostrophic relation and eliminating the pressure between them [2]: horizontal wind shear equals the Coriolis parameter. Wind speed measured on the ship every two hours is used to compute the mean wind shear over the 48 hours of the rain storm. That shear has the right sign and order of magnitude to agree with the Coriolis parameter at 35°N.
文摘Sea level across the wide warm northeastward current off California is calculated from hydrographic data along 35N using the hydrostatic balance and the assumption that the warm mixed layer water floats on the colder stratified water underneath. It is found that the sea level is higher above the warm water by a maximum of 7 cm in the middle of the flow. However, the mean east/west slope of the sea surface is deduced to be too small to balance the Coriolis force on the northward current. Therefore, geostrophy, as it is usually understood, is not operating strictly within the surface layer itself.
基金supported by the Research Fund for the Doctoral Program of Higher Education(Grant No.20020423007 and 20030423011)the National Natural Science Foundation of China(Grant Nos.40276010,49976003 and 49876012)the State Major Basic Research Development Project(Grant No.G1999043809).
文摘A genuine geostrophic small amplitude wave solution is deduced for the first time from the general form of linear fluid dynamic equations with the f-plane approximation, where the horizontal component of angular velocity of the earth rotation is taken into account. The Coriolis- induced stress obtained from this solution consists of lateral and reverse component, while its first order approximation is reduced to the result of Hasselmann or Xu Zhigang. Accordingly, combining the Coriolis-induced wave stress with the virtual wave stress proposed by Longuet-Higgins, the ratio of total wave-induced stress to wind stress on the sea surface is es- timated, through which the importance of the wave-induced stress is emphasized in the study of the currents in the seas around China, especially in the Bohai Sea and the Yellow Sea.
