Vertical Transport of Sensible Heat and Meteoric Na by the Complete Temporal Spectrum of Gravity Waves in the MLT Above McMurdo (77.84°S, 166.67°E), Antarctica
Vertical Transport of Sensible Heat and Meteoric Na by the Complete Temporal Spectrum of Gravity Waves in the MLT Above McMurdo (77.84°S, 166.67°E), Antarctica
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南极洲麦克默多（77.84°S，166.67°E）上方 MLT 重力波完整时间谱对显热和流星钠的垂直传输
DOI：
10.1029/2021jd035728
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Lin, Cissi Ying‐Tsen
中科院分区：
文献类型：
--
作者：
Chu, Xinzhao;Gardner, Chester S.;Li, Xianxin;Lin, Cissi Ying‐Tsen
我们报告了2020年5月下旬在南极洲麦克默多对78至110公里处感热和大气Na垂直通量的首次激光雷达观测。这些测量包括来自重力波完整时间谱的贡献，并表明与非破碎重力波的大气混合相关的波诱导垂直传输，波谱赋予的斯托克斯漂移，以及反应性物质的扰动化学，可以对中间层和低热层（MLT）的成分和热量传输做出重大贡献。测得的感热和钠通量在84 km（−3.0 Kms− 1和−5.5 × 104 cm −2s−1）处出现向下的峰值，比中纬度观测到的通量峰值高度低0.4km。这可能是由5月下旬麦克默多上空的强烈下降流造成的。钠通量的大小是中纬度地区最大值的两倍，我们认为这与麦克默多MLT中的强持续重力波有关。为了使测得的Na通量与理论值之间达到良好的一致性，有必要推断大部分重力波能量向下传播，特别是在Na通量和波耗散最大的80至95公里之间。这些向下传播的波很可能是由源自较低海拔的初级波的耗散原位产生的次级波。感热通量从90 km以下向下过渡到97 ~ 106 km的向上。用λz> 10 km的一次和二次重力波偏振关系的完全可压缩解解释了观测结果。
We report the first lidar observations of vertical fluxes of sensible heat and meteoric Na from 78 to 110 km in late May 2020 at McMurdo, Antarctica. The measurements include contributions from the complete temporal spectrum of gravity waves and demonstrate that wave‐induced vertical transport associated with atmospheric mixing by non‐breaking gravity waves, Stokes drift imparted by the wave spectrum, and perturbed chemistry of reactive species, can make significant contributions to constituent and heat transport in the mesosphere and lower thermosphere (MLT). The measured sensible heat and Na fluxes exhibit downward peaks at 84 km (−3.0 Kms−1and −5.5 × 104cm−2s−1) that are ∼4 km lower than the flux peak altitudes observed at midlatitudes. This is likely caused by the strong downwelling over McMurdo in late May. The Na flux magnitude is double the maximum at midlatitudes, which we believe is related to strong persistent gravity waves in the MLT at McMurdo. To achieve good agreement between the measured Na flux and theory, it was necessary to infer that a large fraction of gravity wave energy was propagating downward, especially between 80 and 95 km where the Na flux and wave dissipation were largest. These downward propagating waves are likely secondary waves generated in‐situ by the dissipation of primary waves that originate from lower altitudes. The sensible heat flux transitions from downward below 90 km to upward from 97 to 106 km. The observations are explained with the fully compressible solutions for polarization relations of primary and secondary gravity waves withλz> 10 km.
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