El Roque de Los Muchachos Site Characteristics. I. Temperature Analysis
El Roque de Los Muchachos Site Characteristics. I. Temperature Analysis
复制标题
El Roque de Los Muchachos 遗址特征。
DOI：
10.1086/507344
复制
发表时间：
2006
影响因子：
3.5
通讯作者：
M. Pedani
中科院分区：
文献类型：
--
作者：
Gianluca Lombardi;V. Zitelli;S. Ortolani;M. Pedani
我们对位于加那利群岛洛斯穆查霍斯天文台的两个望远镜的温度进行了分析。包括了20多年来在嘉士伯自动子午环(CAMC；现在称为嘉士伯子午线望远镜)的测量结果。对望远镜、国家卫星、伽利略卫星(TNG)和CAMC的数据分析进行了比较，以检查当地的变化和长期趋势。此外，不同高度的温度与天文观测的质量有关。我们考虑了北大西洋涛动(NAO)指数和年平均气温之间的相关性。这项工作的最终目的是更好地了解大尺度参数对当地气象数据的影响。分析是使用统计方法进行的。根据每一长序列的数据，我们先计算小时平均值，然后计算月平均值，以减少由于昼夜循环而引起的短期波动。特别注意尽量减少因缺失数据而产生的偏差所造成的任何影响。最后，我们根据月平均值计算出年平均值。这两台望远镜显示出类似的趋势。年平均气温每10年上升约1.0℃，另外，年最低值比最大值增加得更快。我们发现，正的NAO指数减小了温度的升高，并加速了温度的下降。此外，没有证据表明，正的NAO指数对应着较少的不可观测夜晚。最后，当离地面2米到10米之间的温度梯度大于−0.6°C时，视力会恶化。
We present an analysis of temperature taken at two telescopes located at the Observatorio del Roque de Los Muchachos, in the Canary Islands. More than 20 years of measurements at the Carlsberg Automatic Meridian Circle (CAMC; now called the Carlsberg Meridian Telescope) are included. Analyses of data from the Telescopio Nazionale Galileo (TNG) and CAMC are compared in order to check local variations and long‐term trends. Furthermore, the temperatures at different heights are correlated with the quality of astronomical seeing. We consider a correlation between the North Atlantic Oscillation (NAO) Index and annual downtime with mean annual temperatures. The final aim of this work is to better understand the influence of wide‐scale parameters on local meteorological data. The analysis is performed using a statistical approach. From each long series of data, we compute the hourly averages and then the monthly averages in order to reduce the short‐term fluctuations due to the day‐night cycle. Particular care is taken to minimize any effect due to biases due to missing data. Finally, we compute the annual average from monthly averages. The two telescopes show similar trends. There is an increase in temperature of about 1.0°C per 10 yr from the annual means, and in addition, the annual minimums increase more rapidly than the maximums. We find that a positive NAO Index reduces the increase of temperature and accelerates the decrease. Moreover, there is no evidence that a positive NAO Index corresponds to a lower number of nonobservable nights. Finally, seeing deteriorates when the gradient of temperatures between 2 and 10 m above the ground is greater than −0.6°C.