Assessing Physical Relationships Between Atmospheric State, Fluxes, and Boundary Layer Stability at McMurdo Station, Antarctica
Assessing Physical Relationships Between Atmospheric State, Fluxes, and Boundary Layer Stability at McMurdo Station, Antarctica
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评估南极洲麦克默多站大气状态、通量和边界层稳定性之间的物理关系
DOI：
10.1029/2021jd036075
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Cassano, John J.
中科院分区：
文献类型：
--
作者：
Dice, Mckenzie J.;Cassano, John J.
利用2015年11月24日至2017年1月3日在南极洲麦克默多站的观测资料描述了边界层稳定性与大气状态和通量之间的物理关系。该分析的基础是自组织图（SOMs），这是一种神经网络算法，用于识别在大气辐射测量（ARM）南极西部辐射实验（AWARE）活动期间每天两次的无线电探空数据中存在的潜在温度分布范围。SOM确定了在大气最低500米范围内从强稳定到弱稳定的剖面。结果表明，冬季（MJJA）以中、强稳定型为主（61%），夏季以弱稳定型为主（DJ, 83.4%）。分析了每个季节不同稳定状态占主导地位的机制，以确定为什么这些状态在全年以不同的频率发生。该分析发现，风速变化和辐射冷却是冬季观测到的稳定性的原因，辐射变暖和较弱的风速是夏季观测到的弱稳定性的原因，而过渡季节（FMA， SON）的稳定性变化的特征是净辐射的符号随着稳定性的增加而变化，因为风速在整个稳定体系中变化很小。低空急流约有50%的时间发生在高空稳定性增强区域以下，在过渡季节最常被观测到。由体积理查德森数确定的边界层深度随着稳定性的增加而减小。
Observations at McMurdo Station, Antarctica from 24 November 2015 through 3 January 2017 were used to characterize the physical relationships between boundary layer stability and atmospheric state and fluxes. The basis of this analysis was self‐organizing maps (SOMs), a neural network algorithm, used to identify the range of potential temperature profiles present in the twice‐daily radiosonde data during the ARM (Atmospheric Radiation Measurement) West Antarctic Radiation Experiment (AWARE) campaign. The SOM identified profiles ranging from strongly stable to weakly stable regimes over the lowest 500 m of the atmosphere. It was found that in the winter (MJJA), moderate and strongly stable regimes occur most frequently (61%), while weakly stable regimes dominate in the summer (DJ, 83.4%). The mechanisms responsible for the dominance of different stability regimes in each season were analyzed to determine why these regimes occur with varying frequency throughout the year. This analysis found that wind speed variations and radiative cooling are responsible for the stability observed in the winter, radiative warming, as well as weaker wind speeds, are responsible for summer weak stability, and stability variations in the transition seasons (FMA, SON) are characterized by a change in sign of net radiation with increasing stability, as wind speed changes little across stability regimes. Low‐level jets were observed to occur about 50% of the time below areas of enhanced stability aloft and were observed most frequently in the transition seasons. The boundary layer depth, as determined by the Bulk Richardson number, was found to decrease with increasing stability.
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