Interhemispheric comparison of mesospheric ice layers from the LIMA model
Interhemispheric comparison of mesospheric ice layers from the LIMA model
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LIMA 模型中层冰层的半球间比较
DOI：
10.1016/j.jastp.2007.07.006
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发表时间：
2007
影响因子：
1.9
通讯作者：
U. Berger
中科院分区：
文献类型：
--
作者：
F.-J. Lübken;U. Berger
利用新的LIMA/ice模式研究了夏季中间层上部的南北半球温度差异及其对冰粒子相关现象形态的影响，这些现象包括极地中间层云（NLC）、极地中间层云（PMC）和极地中间层夏季回波（PMSE）。LIMA/ice很好地再现了观测到的冰层的平均特征，例如它们随季节、海拔和纬度的变化。南半球（SH）与北半球相比略热，但在NLC/PMC/PMSE高度和向极70 ° N/S处的差异小于3 K。这与在69 ° N和68 ° S下通过落球进行的原位温度测量一致。地球的偏心率导致SH中间层比NH温暖102 - 3 K，高达约85公里，并且与纬度相当无关。LIMA的NH/SH温差一般随纬度的降低而增大，在50 ° C时可达10 K左右。NH/SH温差的纬向变化可能是由动力强迫引起的，并解释了为什么PMSE基本上不存在于中纬度的SH，而它们仍然是相当常见的在NH相似的colatitudes。北半球NLC和PMC的出现频次和亮度均较大，但随纬度的增加，两者的差异逐渐减小。夏季条件在SH终止较早相比，NH，导致更早的削弱和结束的冰层季节。南半球的NLC高度略高0.6- 1 km，而NLC高度本身取决于两个半球的季节。与其他模式相比，LIMA/冰显示较小的半球间的温度差异，但仍然产生所观察到的NH/SH冰层特性的差异。这强调了温度控制冰粒的存在和形态的重要性。从LIMA/ice推导出的NLC/PMC/PMSE特征的半球间差异基本上与激光雷达、卫星和雷达的观测结果一致。
The new LIMA/ice model is used to study interhemispheric temperature differences at the summer upper mesosphere and their impact on the morphology of ice particle related phenomena such as noctilucent clouds (NLC), polar mesosphere clouds (PMC), and polar mesosphere summer echoes (PMSE). LIMA/ice nicely reproduces the mean characteristics of observed ice layers, for example their variation with season, altitude, and latitude. The southern hemisphere (SH) is slightly warmer compared to the NH but the difference is less than 3K at NLC/PMC/PMSE altitudes and poleward of 70∘N/S. This is consistent with in situ temperature measurements by falling spheres performed at 69∘N and 68∘S. Earth's eccentricity leads to a SH mesosphere being warmer compared to the NH by ∼2–3K up to approximately 85km and fairly independent of latitude. In general, NH/SH temperature differences in LIMA increase with decreasing latitude and reach ∼10K at 50∘. The latitudinal variation of NH/SH temperature differences is presumably caused by dynamical forcing and explains why PMSE are basically absent at midlatitudes in the SH whereas they are still rather common at similar colatitudes in the NH. The occurrence frequency and brightness of NLC and PMC are larger in the NH but the differences decrease with increasing latitude. Summer conditions in the SH terminate earlier compared to NH, leading to an earlier weakening and end of the ice layer season. The NLC altitude in the SH is slightly higher by 0.6–1km, whereas the NLC altitudes itself depend on season in both hemispheres. Compared to other models LIMA/ice shows smaller interhemispheric temperature differences but still generates the observed NH/SH differences in ice layer characteristics. This emphasizes the importance of temperature controlling the existence and morphology of ice particles. Interhemispheric differences in NLC/PMC/PMSE characteristics deduced from LIMA/ice basically agree with observations from lidars, satellites, and radars.
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DOI：
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DOI：
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