The predominance of swells or wind-seas at a location can be inferred from the spectral peak wave period (T_p). The present study examines the climatology of T_p and its variability in the Bay of Bengal (BoB) during the last 40 years based on reanalysis data. The Andaman and Nicobar Islands and Sri Lanka significantly alter the spatial distribution of T_p in the BoB. Spatial variation in T_p was less than 10% for 1° latitude, except for regions blocked by the landmass. Inter-annual changes in the annual average T_p were 8–18% at different locations. In most areas, climatological monthly T_p was largest in March, April, and October, when the winds were weak. The high T_p tongue extends to the BoB through the eastern side of the bay. The study also examines the relationship between three major natural climate variabilities; El Niño–Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), and Southern Annular Mode (SAM) with T_p anomalies in the BoB. We observed that negative ENSO and SAM events enhance the long-period waves in the BoB, while a negative IOD event generates more short-period waves in the BoB.

溶胀或风海洋的位置处的优势可以从谱峰波周期（被推断Ť _p）。本研究根据再分析数据检查了孟加拉湾 (BoB) 过去 40 年间T _p的气候学及其变异性。安达曼和尼科巴群岛以及斯里兰卡显着改变了 BoB中T _p的空间分布。除了被陆地阻挡的区域外，T _{p 的}空间变化在1° 纬度上小于 10%。不同地点的年平均T _p的年际变化为 8-18%。在大多数地区，气候月T _p风弱的三月、四月和十月最大。高T _p舌头通过海湾的东侧延伸到 BoB。该研究还考察了三个主要自然气候变量之间的关系；厄尔尼诺-南方涛动 (ENSO)、印度洋偶极子 (IOD) 和南方环状模式 (SAM) 以及BoB 中的T _p异常。我们观察到负 ENSO 和 SAM 事件增强了 BoB 中的长周期波，而负 IOD 事件在 BoB 中产生了更多的短周期波。