Persistent longitudinalvariations in 8 years of CIPS/AIM polar mesospheric clouds
Persistent longitudinalvariations in 8 years of CIPS/AIM polar mesospheric clouds
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CIPS/AIM 极地中层云 8 年持续纵向变化
DOI：
10.1002/2015jd024624
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
T. Nakamura
中科院分区：
文献类型：
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作者：
Liu X.;J. Yue;J. Xu;W. Yuan;J. M. Russell III;M. E. Hervig;T. Nakamura
中间层冰高层大气学（AIM）卫星上的云成像和颗粒大小（CIPS）仪器为研究极地中间层云（PMC）的纵向变化提供了机会。我们使用CIPS仪器8年（2007-2014）的观测结果检查了PMC的纵向变化。结果表明，南半球尤其是80°S-85°S纬度带的PMC_（10）在60°W-150°W经度范围内持续偏低（相对于南半球其它地区约65%）。然而，在北方，发现PMC的纬向不对称性相对较强。调和分析表明，上海太平洋环流持续的经向变化是由纬向波数1 - 4（WN 1-WN 4）过程引起的，其最小值出现在60°W-150°W的经度范围内。基于一个简单的0-D PMC模式和微波临边探测器（MLS）的温度以及宽带发射辐射测量大气探测（SABER）和MLS的H2O观测结果，讨论了温度和H2O对PMC辐度纵向变化的影响。模拟的SH低冰量区域与CIPS中看到的低PMC冰量区域基本一致。利用SABER温度的潮汐分析表明，非迁移半日潮与模式的S 0，W1，和E1可能是持续的纵向变化的PMC在SH的潮汐的主要驱动力。非迁移潮弱得多，在NH和一致的观察到的缺乏纵向变化的PMC Aubendo。
The Cloud Imaging and Particle Size (CIPS) instrument on the Aeronomy of Ice in the Mesosphere (AIM) satellite provides an opportunity to study the longitudinal variation in polar mesospheric cloud (PMC). We examined the longitudinal variation in PMC albedo using 8 years (2007–2014) of observations from the CIPS instrument. The results show that the PMC albedo in the Southern Hemisphere (SH), especially in the latitude band of 80°S–85°S, is persistently low (~65% relative to the rest of the hemisphere) within 60°W to 150°W longitude. In the Northern Hemisphere (NH), however, PMC albedo is found to be relatively zonally asymmetry. Harmonic analyses show that the persistent longitudinal variation in the SH PMC albedo is due to zonal wave numbers 1 through 4 (WN1–WN4) processes with minima in the longitude range of 60°W–150°W. The influence of temperature and H2O on the longitudinal variation of the PMC albedo is discussed based on results obtained using a simple 0‐D PMC model and temperature from the Microwave Limb Sounder (MLS) and the Sounding of the Atmosphere with Broadband Emission Radiometry (SABER) and H2O from MLS. The modeled region of low ice mass in the SH is generally consistent with that of low PMC albedo seen in CIPS. Tidal analyses using the SABER temperatures indicate that the nonmigrating semidiurnal tides with modes of S0, W1, and E1 might be the main drivers of the persistent longitudinal variations of PMC albedo in the SH. Nonmigrating tides are much weaker in the NH and consistent with the observed lack of longitudinal variability in PMC albedo.