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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Polar mesospheric clouds: Infrared measurements from the Midcourse Space Experiment
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Polar mesospheric clouds: Infrared measurements from the Midcourse Space Experiment

机译：极地气层云:红外测量从中途空间实验

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摘要

Spatial Infrared Imaging Telescope (SPIRIT) III radiometer on the Midcourse Space Experiment (MSX) satellite measured highly structured infrared, IR, emission from polar mesospheric cloud (PMC) ice particles at northern latitudes above 51 degrees on 22 July 1996 in the 11.1 to 13.2 and 18.2 to 25.1 μm radiometer channels, bands C and E, respectively. Measurements of the PMC thermal emissions included the observation of an extended cloud at 84.8°N and 325.6°E at 0313:25 UT, a local solar time of approximately 0056. In this Earth limb observation, the radiance due to the PMC has been isolated from other sources-atmospheric emission, nonrejected off axis radiation from the terrestrial surface and zodiacal radiance-and inverted to determine the volume emission rates of the ice particles at a spatial resolution of 0.3 km in the altitude range from 83.4 to 86.4 km. The band C PMC volume emission rate profile has a maximum value at 84.0 ± 0.3 km and decreases to one half the peak value at 85.0 and 83.5 km. Temperatures in the range from 143 ± 7 to 130 ± 8 K and ice volume densities from 1.5 to 0.5 × 10?13 cm3 per cm3 were determined from the LWIR volume emission rates at altitudes from 83.4 to 86.4 km. The PMC ice densities are equivalent to an enriched gas phase water mixing ratio of 8 to 16 parts per million by volume, ppmv, and a vertical column mass density of 3.3 × 10?8 gms cm?2 in this observation.
机译：第三空间红外成像望远镜(精神)辐射计中途空间实验(MSX)卫星测量高度结构化的从极地红外、红外发射云(PMC)冰颗粒在北部高纬度地区51度以上11.1至1996年7月22日13.2和18.2 - 25.1μm辐射计通道,分别带C和E。PMC热排放包括观察一个扩展的云在84.8°N和325.6°E0313:25 UT,约的地方太阳时0056. 光辉由于PMC隔绝其他sources-atmospheric发射,nonrejected从轴从地面辐射和黄道带的光辉和倒来确定体积冰粒子的发射率空间分辨率为0.3公里的高度范围从83.4到86.4公里。排放速度剖面的最大值为84.0±0.3公里,减少到一个峰值的一半在85.0和83.5公里。从143±7到130±8 K和冰体积密度从1.5到0.5×10 ?从LWIR体积测定发射利率高度从83.4到86.4公里。冰密度相当于一个丰富的天然气水相混合的比例每8 - 16部分百万销量,ppmv和垂直列质量密度为3.3×10 ?观察。

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