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首页> 外文期刊>Journal of Climate >Air-Sea Interactions among Oceanic Low-Level Cloud, Sea Surface Temperature, and Atmospheric Circulation on an Intraseasonal Time Scale in the Summertime North Pacific Based on Satellite Data Analysis
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Air-Sea Interactions among Oceanic Low-Level Cloud, Sea Surface Temperature, and Atmospheric Circulation on an Intraseasonal Time Scale in the Summertime North Pacific Based on Satellite Data Analysis

机译：基于卫星数据分析，海洋低级云，海面温度和大气循环的海洋低级云，海面温度和大气循环的互动

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摘要

Low-level cloud plays a key role in modulating air-sea interaction processes and sea surface temperature (SST) variability. The present study investigated the evolution process of oceanic low-level cloud cover (LCC) and related air-sea interaction processes on an intraseasonal time scale in the summertime (June-October) North Pacific (30 degrees-40 degrees N, 165 degrees-175 degrees E) based on satellite observational and reanalysis datasets from 2003 to 2016. The intraseasonal time scale (20-100 days) is dominant not only for the LCC, but also for LCC controlling factors, that is, SST, estimated inversion strength (EIS), and horizontal temperature advection (T-adv). To reveal the lead-lag relationship among these variables, we conducted phase composite analysis with a bandpass filter based on the intraseasonal variability (ISV) of LCC. It suggests that ISV of LCC leads to that of SST and that horizontal dry-cold advection from the poleward region leads to increasing LCC and decreasing SST. The increasing LCC corresponds to a positive relative humidity (RH) anomaly in the lower troposphere, which is due to adiabatic cooling with shallow convection, vertical moisture advection, and meridionalRHadvection associated with the anomalous cold T-adv. Heat budget analysis of the ocean mixed layer suggests the importance of anomalous dry-cold advection for cooling SST, not only via enhanced latent heat release but also via decreased downward shortwave radiation at the sea surface according to cloud radiative effect with a positive LCC anomaly. Determining the detailed lead-lag relationship between LCC and its controlling factor is a good approach to understand mechanisms of the local processes of both low-level cloud evolution and air-sea interaction.
机译：低级云在调制海洋互动过程和海表面温度（SST）可变性方面发挥着关键作用。本研究调查了海洋低级云覆盖（LCC）的演变过程及相关的海洋互动过程，在夏季（六月至10月）北太平洋（30度-40度N，165度 - 175摄氏度基于2003年至2016年的卫星观察和再分析数据集。季节性额度规模（20-100天）不仅适用于LCC，还适用于LCC控制因素，即SST，估计反转强度（ EIS）和水平温度平流（T-ADV）。为了揭示这些变量之间的引导滞后关系，我们通过基于LCC的季节性变异性（ISV）的带通滤波器进行了相位复合分析。它表明LCC的ISV导致SST的ISV以及来自极地区域的水平干燥平流导致LCC的增加和降低SST。增加的LCC对应于较低的对流层中的正相湿度（RH）异常，这是由于具有浅对流，垂直水分平流的绝热冷却，以及与异常冷T-ADV相关的子午线。海洋混合层的热预算分析表明对冷却SST的异常干燥平流的重要性，而不仅通过增强的潜热释放，而且还通过云辐射效应与阳性LCC异常的云辐射效应下降。确定LCC与其控制因子之间的详细引导滞后关系是理解低级云进化和海海相互作用的本地过程机制的良好方法。

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