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首页> 外文会议>Oceans MTS/IEEE Conference >Mixed-layer heat budget associated with ENSO, IOD, and PDO inferred from satellite ocean data assimilation
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Mixed-layer heat budget associated with ENSO, IOD, and PDO inferred from satellite ocean data assimilation

机译：与ENSO，IOD和PDO相关的混合层热预算从卫星海洋数据同化推断出来

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El Nino Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), and Pacific Decadal Oscillation (PDO) are important modes of climate variability of the coupled ocean-atmospheric system on interannual and decadal time scales. The late 1990s features large events of ENSO, IOD, and phase switch of PDO. Satellite measurements of wind, sea level, and sea surface temperature have provided unprecedented capability to monitor such climate events. Mixed-layer heat budget associated with these events are studied using a satellite ocean data assimilation product. The assimilation is part of the ECCO Consortium effort (http://www.ecco-group.org) funded under the National Ocean Partnership Program and collaborated by JPL, SIO, and MIT. ECCO assimilation product is characterized by physical consistency in the evolution of the estimated state such that various physical budgets are closed. This presentation compares heat budget of ENSO, IOD, and phase switch of PDO, in particular, in terms of the relative contribution by air-sea interaction and oceanic processes in mixed-layer temperature (MLT) balance. Oceanic advection plays a similarly important role to the three climate events in assisting the evolution of MLT. The role of air-sea heat flux marks a stark contrast among these events. Damping of MLT by air-sea heat flux is found for ENSO and IOD in the tropics, providing a necessary condition for negative feedback in the coupled ocean-atmosphere system. However, the same is not found in mid-latitude Pacific during the PDO phase switch. For ENSO, oceanic advection and mixing in the eastern equatorial Pacific cause a much larger amount of heat anomaly than the storage by oceanic mixed layer. This results in very large heat loss that affects equatorial zonal wind and in turn influences MLT through oceanic processes. For IOD, the pile-up of heat anomaly in the western equatorial Indian Ocean by oceanic processes is comparable to mixed-layer storage, suggesting that air-sea coupling associated with IOD is not as active as that for ENSO.
机译：El Nino Southern振荡（ENSO），印度洋偶极（IOD）和太平洋Decadal振荡（PDO）是互际和截止时间尺度的耦合海洋大气系统的气候变异性的重要模式。 20世纪90年代后期具有PDO的enso，iod和相位开关的大事件。风量，海平面和海面温度的卫星测量提供了不再先例的能力来监测这些气候事件。使用卫星海洋数据同化产品研究与这些事件相关的混合层热预算。同化是ECCO联盟努力的一部分（http://www.ecco-group.org）资助国家海洋伙伴关系计划，由JPL，SIO和MIT合作。 ECCO同化产品的特点是估计状态的演变的物理一致性，使得各种物理预算已关闭。本介绍比较了PDO的ENSO，IOD和相位开关的热预算，特别是在混合层温度（MLT）平衡中的海洋相互作用和海洋过程的相对贡献方面。海洋平流在协助MLT演变方面对三项气候事件发挥着同样重要的作用。空中海热助热通量的作用标志着这些事件中的鲜明对比。在热带地区，发现ENSO和IOD的空气海热通量的MLT阻尼，在耦合海洋气氛系统中提供了对负反馈的必要条件。然而，在PDO相位开关期间，在中纬度太平洋中没有发现相同的情况。对于ENSO，海洋平流和东部赤道太平洋的混合导致大量的热异常，而不是海洋混合层的储存。这导致非常大的热量损失，从而影响赤道危险，反过来影响MLT通过海洋过程。对于IOD，海洋过程中赤道印度海洋的热异常堆积与混合层储存相当，这表明与IOD相关的空中海耦合并不像ENSO那样活跃。

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