Climatology of the diurnal tides from eCMAM30 (1979 to 2010) and its comparison with SABER
Climatology of the diurnal tides from eCMAM30 (1979 to 2010) and its comparison with SABER
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eCMAM30（1979年至2010年）日潮汐气候学及其与SABRE的比较
DOI：
10.1186/1880-5981-66-103
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发表时间：
2014-08
期刊：
影响因子：
--
通讯作者：
Shangdong Zhang
中科院分区：
文献类型：
--
作者：
William E Ward;Stephen R Beagley;Victor I Fomichev;Shangdong Zhang
扩展的加拿大中层大气模式（eCMAM）最近在一个轻推模式下运行，使用1979年1月至2010年6月期间从地面到1百帕的再分析数据（因此命名为eCMAM 30）。本文利用eCMAM 30温度资料研究了平流层、中层和低热层的背景平均温度、日潮汐谱以及迁移日潮汐Dw 1和三个非迁移日潮汐De 3、Dw 2和Ds 0的气候学特征。然后将模型结果与2002年1月至2013年12月在40至110公里和50° S至50° N之间使用宽带发射辐射测量法（SABER）观测的大气探测得出的昼夜潮汐气候学进行比较。除了eCMAM 30的冷中层顶温度比SABER低10 ~ 20 K外，该模式较好地再现了纬向背景平均温度梯度。eCMAM 30和SABER的日潮汐谱及其相对强度比较好。两个数据集的四个昼夜潮汐分量（Dw 1，De 3，Dw 2和Ds 0）的高度-纬度结构也非常一致，即使在平流层中的结构具有较弱的振幅。模型和SABER之间的最大差异与De 3的季节变化有关。除了北方半球（NH）夏季最大值，第二个最大值发生在北半球冬季（12月至2月）的模式，但在SABER缺席。其余三个分潮的季节变化基本一致。eCMAM 30和SABER的Dw 1和De 3的年际时间序列显示了25至26个月的周期的变化，这表明平流层准两年振荡（QBO）的日潮汐的调制。
The extended Canadian Middle Atmosphere Model (eCMAM) was recently run in a nudged mode using reanalysis data from the ground to 1 hPa for the period of January 1979 to June 2010 (hence the name eCMAM30). In this paper, eCMAM30 temperature is used to examine the background mean temperature, the spectrum of the diurnal tides, and the climatology of the migrating diurnal tide Dw1 and three nonmigrating diurnal tides De3, Dw2, and Ds0 in the stratosphere, mesosphere, and lower thermosphere. The model results are then compared to the diurnal tidal climatology derived from Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) observations between 40 to 110 km and 50° S to 50° N from January 2002 to December 2013. The model reproduces the latitudinal background mean temperature gradients well except that the cold mesopause temperature in eCMAM30 is 10 to 20 K colder than SABER. The diurnal tidal spectra and their relative strengths compare very well between eCMAM30 and SABER. The altitude-latitude structures for the four diurnal tidal components (Dw1, De3, Dw2, and Ds0) from the two datasets are also in very good agreement even for structures in the stratosphere with a weaker amplitude. The largest discrepancy between the model and SABER is associated with the seasonal variation of De3. In addition to the Northern Hemisphere (NH) summer maximum, a secondary maximum occurs during NH winter (December-February) in the model but is absent in SABER. The seasonal variations of the other three diurnal tidal components are in good agreement. Interannual time series of Dw1 and De3 from both eCMAM30 and SABER reveal variability with a period of 25 to 26 months, which indicates the modulation of the diurnal tides by the stratospheric quasi-biennial oscillation (QBO).
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影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
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影响因子：
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DOI：
10.1002/2013ja019248
发表时间：
2013-12
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
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