Infrared measurements in the Arctic using two Atmospheric Emitted Radiance Interferometers
Infrared measurements in the Arctic using two Atmospheric Emitted Radiance Interferometers
复制标题
使用两个大气发射辐射干涉仪在北极进行红外测量
DOI：
10.5194/amt-5-329-2012
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发表时间：
2012
影响因子：
3.8
通讯作者：
I. Lindenmaier
中科院分区：
文献类型：
--
作者：
Z. Mariani;K. Strong;M. Wolff;P. Rowe;V. Walden;P. Fogal;T. Duck;G. Lesins;D. Turner;C. Cox;E. Eloranta;J. Drummond;C. Roy;D. Turner;D. Hudak;I. Lindenmaier
抽象的。E-AERI（英语：Extended-range Atmospheric Emitted Radiance Interferometer）是一种中等分辨率（1 cm−1）的傅里叶变换红外光谱仪，用于测量400至3000 cm−1之间大气的绝对下降红外光谱辐射。该仪器的扩展光谱范围允许监测400-550 cm−1（20-25 μm）区域，目前大多数红外表面冷却发生在北极的干燥空气中。E-AERI的光谱有可能提供有关加拿大高北极地区辐射平衡、痕量气体和云特性的信息。2008年9月至10月，在威斯康星州大学空间科学和工程中心对E-AERI进行了校准、性能评估和认证。随后，该仪器于2008年10月安装在位于努纳武特尤里卡的极地环境大气研究实验室（PEARL）山脊实验室（海拔610 m），并在那里获取了一年的数据。全年每七分钟进行一次测量，包括PEARL的太阳观测光谱仪不工作的极夜。2006年3月至2009年6月，爱达荷州大学的极地AERI（P-AERI）也安装在距离珍珠岭实验室15公里的零高度珍珠辅助实验室（0 PAL）。在重叠期间，这两个仪器提供了两个高度的校准辐射测量。一个快速的逐行辐射传输模型被用来模拟在两个高度的下降流辐射;最大的差异（模拟测量）发生在受大气温度和/或水蒸气强烈影响的光谱区域。两个AERI仪器非常接近，但位于两个不同的高度，非常适合调查云强迫。作为一个例子，它表明，薄，低冰云导致6%的辐照度增加。云的存在在北极产生了巨大的地表辐射强迫，特别是在750-1200 cm−1的区域，那里的下沉辐射比晴空辐射大几倍，这比其他更潮湿的地区要大得多。
Abstract. The Extended-range Atmospheric Emitted Radiance Interferometer (E-AERI) is a moderate resolution (1 cm−1) Fourier transform infrared spectrometer for measuring the absolute downwelling infrared spectral radiance from the atmosphere between 400 and 3000 cm−1. The extended spectral range of the instrument permits monitoring of the 400–550 cm−1 (20–25 μm) region, where most of the infrared surface cooling currently occurs in the dry air of the Arctic. Spectra from the E-AERI have the potential to provide information about radiative balance, trace gases, and cloud properties in the Canadian high Arctic. Calibration, performance evaluation, and certification of the E-AERI were performed at the University of Wisconsin Space Science and Engineering Centre from September to October 2008. The instrument was then installed at the Polar Environment Atmospheric Research Laboratory (PEARL) Ridge Lab (610 m altitude) at Eureka, Nunavut, in October 2008, where it acquired one year of data. Measurements are taken every seven minutes year-round, including polar night when the solar-viewing spectrometers at PEARL are not operated. A similar instrument, the University of Idaho's Polar AERI (P-AERI), was installed at the Zero-altitude PEARL Auxiliary Laboratory (0PAL), 15 km away from the PEARL Ridge Lab, from March 2006 to June 2009. During the period of overlap, these two instruments provided calibrated radiance measurements from two altitudes. A fast line-by-line radiative transfer model is used to simulate the downwelling radiance at both altitudes; the largest differences (simulation-measurement) occur in spectral regions strongly influenced by atmospheric temperature and/or water vapour. The two AERI instruments at close proximity but located at two different altitudes are well-suited for investigating cloud forcing. As an example, it is shown that a thin, low ice cloud resulted in a 6% increase in irradiance. The presence of clouds creates a large surface radiative forcing in the Arctic, particularly in the 750–1200 cm−1 region where the downwelling radiance is several times greater than clear-sky radiances, which is significantly larger than in other more humid regions.