NLC observations during one solar cycle above ALOMAR
NLC observations during one solar cycle above ALOMAR
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NLC 在 ALOMAR 上空一个太阳周期期间的观测
DOI：
10.1016/j.jastp.2008.11.010
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发表时间：
2009
影响因子：
1.9
通讯作者：
F. Lübken
中科院分区：
文献类型：
--
作者：
J. Fiedler;G. Baumgarten;F. Lübken
1997年至2007年间，位于挪威北方的中层大气研究北极激光雷达观测站（ALOMAR）的瑞利/米氏/拉曼（RMR）激光雷达在北纬69度，东经16度观测到了平流层云（NLC）。在3322小时的观测中，11年、11个季节和11个当地时间的观测时间分布均匀，共观测到NLC 1272小时。夏至后15-30天是NLC出现、高度、亮度和垂直范围的季节极值。强NLC的年与年发生频率在2004年之前与太阳活动呈反相关，此后单调下降。卫星搭载的SBUV仪器没有观测到云出现的这种下降，这就提出了用不同方法观测到的云出现的解释问题。2004年以后，云水含量基本不变，甚至有所下降。考虑到整个11年的时间，强云的出现与太阳活动之间没有显着的反相关性。全云和强云的NLC平均高度分别为83.2km± 20 m和82.5km± 30 m。今天的云层高度与2115年前的观测结果（82.1公里）仅相差几百米。考虑到目前地球物理云高度的变化为0.1km，平均NLC高度似乎没有变化。根据当前全球大气模式计算的温度趋势，这种行为福尔斯没有达到预期的高度下降2公里以上。
Between 1997 and 2007 noctilucent clouds (NLC) have been observed by the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) Rayleigh/Mie/Raman (RMR) lidar in Northern Norway at 69∘N, 16∘E. During a total of 3322 measurement hours, being well distributed over the 11 years, season and local time, NLC were detected for 1272h. The seasonal extreme values of NLC occurrence, altitude, brightness and vertical extent are found 15–30 days after summer solstice. The year-to-year occurrence frequency of strong NLC is anti-correlated to solar activity until 2004 and decreases monotonously thereafter. This drop in cloud occurrence is not seen by satellite-borne SBUV instruments and raises the question about the interpretation of cloud occurrences observed by different methods. The cloud water content is unchanged or even decreasing after 2004. Considering the entire 11 year period there is no significant anti-correlation between the occurrence of strong clouds and solar activity. The mean NLC altitudes are 83.2km±20m and 82.5km±30m for all clouds and strong clouds, respectively. Today's cloud altitudes differ by only a few hundred meters from observations ∼115 years ago (82.1km). Taking into account current geophysical cloud altitude variability of ∼1km, the mean NLC altitude appears to be unchanged. This behavior falls short of an expected altitude decrease of more than 2km following from temperature trends calculated by current global atmosphere models.
影响因子：
5.2
作者：
U. Berger;F.-J. Lübken
通讯作者：
F.-J. Lübken