印尼贯穿流对印度洋的热量贡献

本文基于海洋环流模式模拟的高分辨率欧拉场，利用拉格朗日追踪方法，评估了印尼贯穿流（ITF）对印度洋的热量贡献。通过计算ITF水体在印度洋的传输路径及伴随的温度变化来获取ITF水体在印度洋的热量传输过程。模拟结果表明ITF进入印度洋后主要向西流动并在到达马达加斯加后分叉，进入南、北印度洋。热收支分析表明ITF在北印度洋吸收0.41 PW热量，在南印度洋释放0.56 PW热量；这两个过程相互补偿，导致ITF对整个印度洋的净加热贡献并不显著，只有0.15 PW。进一步的检查ITF离开印度洋的出口（跨过34°S），结果表明ITF主要随着位于西边界的奥古拉斯流和位于东边界的利文流离开印度洋。约89%的ITF水体沿着西边界离开印度洋，其余的11%主要沿着东边界离开印度洋；前者对整个印度洋的净加热贡献为0.10 PW，后者的净加热贡献为0.05 PW。

Heat contribution of the Indonesian throughflow to the Indian Ocean

Based on the high-resolution Eulerian fields of an ocean general circulation model simulation, the heat contribution of the Indonesian throughflow(ITF) to the Indian Ocean is estimated by Lagrangian tracing method.The heat transport of each particle of ITF waters is calculated by tracing temperature change along the trajectory until the particle exits the Indian Ocean. The simulation reveals that the ITF waters flow westward and branch near Madagascar, further showing the ITF waters are redistributed in both northern and southern Indian Ocean.Heat budget analysis indicates that the ITF waters gain 0.41 PW(Petawatts, 1015 W) in the northern Indian Ocean and lose 0.56 PW in the southern Indian Ocean, respectively. As a result, the ITF waters warm the whole Indian Ocean basin with only 0.15 PW, which shows an "insignificant" role of ITF on the Indian Ocean because of the heat exchange compensation between northern and southern Indian Ocean. Furthermore, the tracing pathways show that the ITF waters mainly flow out the Indian Ocean at both sides of the basin via Agulhas Current and Leeuwin Current. About 89% of the ITF waters leave along western boundary and the rest 11% along eastern boundary. Compared to seeding section, 0.10 PW and 0.05 PW are released to the Indian Ocean, respectively.