当前位置: X-MOL 学术Math. Comput. Simul. Dyn. Atmos. Ocean. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Resonance of Baroclinic Waves in the Tropical Oceans: the Indian Ocean and the far western Pacific
Dynamics of Atmospheres and Oceans ( IF 1.7 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.dynatmoce.2019.101119
Jean-Louis Pinault

Abstract The Indian Ocean has a particularity, its width is close to half the wavelength of a Rossby wave of biannual frequency, this coincidence having been capitalized on by several authors to give the observations a physical basis. The purpose of this article is to show that this is not the case since the resonance of tropical baroclinic waves occurs in all three oceans. This is because the westward-propagating Rossby wave is retroflexed at the western boundary to form off-equatorial Rossby waves dragged by countercurrents before receding and turning back as a Kelvin wave. Thus a quasi-stationary baroclinic wave is formed, whose mean period is tuned to the forcing period. Two independent basin modes resonantly forced are highlighted – 1) a nearly symmetric zonal 1/2-yr period Quasi-Stationary Wave (QSW) that is resonantly forced by the biannual monsoon. It is formed from first baroclinic mode equatorial-trapped Rossby and Kelvin waves and off-equatorial Rossby waves at the western antinode. This QSW controls the Equatorial Counter Current at the node. The Indian Ocean Dipole (IOD) results from a subharmonic mode locking resulting from the coupling of this QSW and the 2nd, 3rd and 4th baroclinic modes - 2) a 1-yr period QSW formed from an off-equatorial baroclinic Rossby wave, which is induced from the southernmost current of the Indonesian Throughflow through the Timor passage, propagating in the southern and northern hemispheres: the drivers are south-easterlies in the southern hemisphere and monsoon wind in the northern hemisphere.

中文翻译:

热带海洋中斜压波的共振:印度洋和远西太平洋

摘要 印度洋有一个特殊性,它的宽度接近两年频率的罗斯比波波长的一半,几位作者利用这一巧合为观测提供了物理基础。本文的目的是表明情况并非如此,因为热带斜压波的共振发生在所有三个大洋中。这是因为向西传播的罗斯比波在西部边界发生后折,形成被逆流拖曳的赤道外罗斯比波,然后以开尔文波的形式后退和折返。这样就形成了一个准平稳的斜压波,其平均周期调整到强迫周期。突出显示了两种独立的盆地模式共振强迫 - 1)近乎对称的纬向 1/2 年周期准静止波 (QSW),它由一年两次的季风共振强迫。它是由第一斜压模式赤道圈闭罗斯比波和开尔文波以及西波腹处的赤道外罗斯比波形成的。该 QSW 控制节点处的赤道逆流。印度洋偶极子 (IOD) 是由该 QSW 与第 2、第 3 和第 4 次斜压模式耦合导致的次谐波锁模产生的 - 2) 由赤道外斜压罗斯比波形成的 1 年周期 QSW,它是从通过帝汶海峡的印度尼西亚通流的最南端引起,在南半球和北半球传播:
更新日期:2020-03-01
down
wechat
bug