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Investigating Tropical Cyclone-Climate Feedbacks Using the TRMM Microwave Imager and the Quick Scatterometer

机译：使用TRMM微波成像仪和快速散射仪调查热带气旋气候反馈

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Sea surface temperature (SST) and near-surface winds from the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and the Quick Scatterometer (QuikScat) are used to calculate globally integrated tropical cyclone-induced SST anomalies and power dissipation (PD). We estimate tropical cyclone-induced upper ocean cooling to be ∼35% higher than our previous estimates based on reanalyzed ERA40 and NCEP surface data. Annually averaged, global PD estimates from TMI are ∼5 × 1019 J for the years 1998 to 2006 (roughly 30% greater than ERA40 PD for overlapping years). QuikScat PD is estimated to be ∼1.7 × 1020 J for the years 2000 to 2006. On the basis of these results, we conclude that the cyclone-induced cooling signal appears to be underrepresented in ERA40 and NCEP reanalysis, as postulated in recent observational and modeling studies. Furthermore, we observe a strong positive relationship between PD and ocean surface cooling, providing further evidence for the likelihood of cyclone-induced climatic feedbacks. These results support the hypothesis that tropical cyclones play an active role in the tropical surface ocean heat budget by cooling the tropical upper oceans through enhanced vertical mixing, which likely represents a net warming beneath the oceanic mixed layer. Thus, to the degree that vertical mixing is important for regulating the ocean\u27s meridional overturning circulation and poleward heat transport, tropical cyclones may be an important contributor to Earth\u27s climate system. This further confirms the results of Emanuel (2001, 2002) and Sriver and Huber (2007b) that possible future changes in integrated cyclone intensity associated with warmer SST may provide possible climatic feedbacks through enhanced vertical mixing and increased ocean heat transport, thus buffering the tropics to increased temperatures while amplifying the warming at higher latitudes.
机译：热带雨量测量任务（TRMM）微波成像仪（TMI）和快速散射仪（QuikScat）的海表温度（SST）和近地表风用于计算全球综合热带气旋引起的SST异常和功率耗散（PD） 。根据重新分析的ERA40和NCEP表面数据，我们估计热带气旋引起的上层海洋降温比我们以前的估计高约35％。从1998年到2006年，TMI对全球PD的年平均估算约为5×1019 J（比重叠年份的ERA40 PD大约高30％）。从2000年到2006年，QuikScat PD估计约为1.7×1020J。根据这些结果，我们得出结论，根据最近的观测和预测，在ERA40和NCEP重新分析中，旋风诱导的冷却信号似乎不足。建模研究。此外，我们观察到局部放电与海洋表面降温之间存在很强的正相关关系，为旋风引起的气候反馈的可能性提供了进一步的证据。这些结果支持以下假设：热带气旋通过增强垂直混合来冷却热带上层海洋，从而在热带表层海洋热量收支中发挥积极作用，这很可能代表了海洋混合层之下的净变暖。因此，在一定程度上垂直混合对于调节海洋的经向翻转循环和极向热传输很重要，热带气旋可能是对地球气候系统的重要贡献。这进一步证实了Emanuel（2001，2002）以及Sriver和Huber（2007b）的结果，即与更暖的SST相关的未来综合气旋强度的未来变化可能会通过增强垂直混合和增加海洋热量传输提供可能的气候反馈，从而缓冲热带地区。升高温度，同时扩大高纬度地区的升温。

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