Observations of polar mesospheric clouds by the Student Nitric Oxide Explorer
Observations of polar mesospheric clouds by the Student Nitric Oxide Explorer
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学生一氧化氮探测器对极地中层云的观测
DOI：
10.1029/2004jd005422
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发表时间：
2005
影响因子：
--
通讯作者：
J. Carstens
中科院分区：
文献类型：
--
作者：
S. Bailey;A. Merkel;G. Thomas;J. Carstens
利用学生一氧化氮探测器（SNOE）上的肢体扫描紫外光谱仪对极地中间层云（PMCs）进行了观测。分析了215和237 nm的辐射曲线以确定云的存在。一旦被探测到，就可以确定云相对于背景大气的高度和亮度。从1998年到2003年，SNOE观测提供了PMC发生的频率作为地点和时间的函数。观测显示，在高纬度地区，发生频率普遍上升，大约在夏至前3周开始，在两个半球持续大约1周。在这些上升之后，大约有60天出现频率相对较高，但变化不定。季节结束时发生频率的下降通常比季节开始时更慢，更有条理。SNOE观测的一个主要结果是，北半球观测到的pmc明显多于南半球，这使我们得出结论，南极中间层的平均饱和程度一定低于北极中间层。SNOE观测还表明，pmc的发生频率受到局部动力影响的强烈调制。SNOE的结果与1981年至1986年用类似仪器观测PMC的太阳中间层探测器的结果基本一致。
[1] Polar Mesospheric Clouds (PMCs) were observed by a limb-scanning ultraviolet spectrometer on the Student Nitric Oxide Explorer (SNOE). Radiance profiles at 215 and 237 nm are analyzed to determine the presence of clouds. Once detected, the altitude and brightness of a cloud relative to the background atmosphere is determined. SNOE observations provide the frequency of occurrence of PMC as a function of location and time for the years 1998 through 2003. The observations show at high latitudes a general rise in frequency of occurrence beginning approximately 3 weeks before summer solstice in both hemispheres and lasting for approximately 1 week. These rises are followed by approximately 60 days of relatively high but variable occurrence frequencies. The declines in frequency of occurrence at the ends of the seasons are generally slower and more structured then the beginning of the seasons. One of the major results from the SNOE observations is that significantly more PMCs are observed in the Northern Hemisphere than in the south, leading us to conclude that the southern polar mesosphere must be on average less saturated than the northern polar mesosphere. The SNOE observations also suggest that the frequency of occurrence of PMCs is strongly modulated by local dynamical influences. The SNOE results are in general agreement with results from the Solar Mesosphere Explorer which observed PMC with similar instrumentation in the years 1981 through 1986.