论文部分内容阅读
在最大温度距平的极值曲面上,对观测资料的分析表明,在这个曲面上的次表层海温距平,一般从西太平洋暖池附近沿赤道向东传播,然后在东太平洋95°W附近向两极传播,并在10°N附近(北半球比南半球清楚)向西传播,再在140°E暖池海域传向赤道,形成一个信号传播的回路。文章试图研究东太平洋次表层海温距平信号在10°N附近向西传播的可能机制。低空850 hPa风场的资料分析表明,当ENSO处在暖(冷)位相时,东太平洋沿岸附近将出现经向风,首先在经向风的吹引下,将产生沿岸的Kelvin波,进而在经向风的辐散(辐合)作用下,通过沿岸的上升(下沉)流在各个纬度激发出向西的Rossby波,但理论表明在与观测接近的周期性经向风作用下由Kelvin波产生的沿岸上升(下沉)流在10°N附近最大,因此在那个纬度附近Rossby波的振幅最大,更易将距平意义下的冷(暖)水传向西太平洋。
An analysis of the observed data at the extreme maximum temperature anomaly shows that subsurface SST anomalies on this surface generally propagate eastward along the equator between the warm pool of the western Pacific and then east of the Pacific 95 ° W Near the 10 ° N (the northern hemisphere is clear than in the southern hemisphere), it propagates westward and towards the equator in the 140 ° E warm pool, forming a signal-spreading circuit. This paper attempts to study the possible mechanism of the SST anomalies propagating westwards near 10 ° N in the eastern Pacific Ocean. Data analysis of 850 hPa wind field at low altitude shows that when ENSO is in the warm (cold) phase, the meridional wind will appear near the east coast of the Pacific Ocean. Under the blowing of the meridional wind, the Kelvin waves will be generated along the coast, Radial wind divergence (convergence) under the action of rising (sink) flow along the coast at each latitude westward Rossby wave excitation, but the theory shows that close to the observation by the cyclonic wind by the Kelvin wave The resulting rising (sinking) currents along the coast are greatest near 10 ° N, so the Rossby wave has the largest amplitude near that latitude, making it easier to transfer the cold (warm) water on an as-built basis to the western Pacific.