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首页> 外文期刊>Journal of the Atmospheric Sciences >An Assessment of the Surface Longwave Direct Radiative Effect of Airborne Saharan Dust during the NAMMA Field Campaign
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An Assessment of the Surface Longwave Direct Radiative Effect of Airborne Saharan Dust during the NAMMA Field Campaign

机译：在NAMMA野战期间机载撒哈拉尘埃的表面长波直接辐射效应的评估

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摘要

In September 2006, NASA Goddard's mobile ground-based laboratories were deployed to Sal Island in Cape Verde (16.73 degrees N. 22.93 degrees W) to support the NASA African Monsoon Multidisciplinary Analysis (NAMMA) field study. The Atmospheric Emitted Radiance Interferometer (AERI), a key instrument for spectrally characterizing the thermal IR, was used to retrieve the dust IR aerosol optical depths (AOTs) in order to examine the diurnal variability of airborne dust with emphasis on three separate dust events. AERI retrievals of dust AOT are compared with those from the coincident/collocated multifilter rotating shadowband radiometer (MFRSR), micropulse lidar (MPL), and NASA Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) sensors. The retrieved AOTs are then inputted into the Fu-Liou 1D radiative transfer model to evaluate local instantaneous direct longwave radiative effects (DRELW) of dust at the surface in cloud-free atmospheres and its sensitivity to dust microphysical parameters. The top-of-atmosphere DRELW and longwave heating rate profiles are also evaluated. Instantaneous surface DRELW ranges from 2 to 10 W m(-2) and exhibits a strong linear dependence with dust AOT yielding a DRELW of 16 W m(-2) per unit dust AOT. The DRELW is estimated to be similar to 42% of the diurnally averaged direct shortwave radiative effect at the surface but of opposite sign, partly compensating for the shortwave losses. Certainly nonnegligible, the authors conclude that DRELW can significantly impact the atmospheric energetics, representing an important component in the study of regional climate variation.
机译：2006年9月，NASA Goddard的移动地面实验室被部署到佛得角萨尔岛（北纬16.73度，北纬22.93度），以支持NASA非洲季风多学科分析（NAMMA）现场研究。大气辐射辐射干涉仪（AERI）是一种用于对红外光谱进行光谱表征的关键仪器，用于检索粉尘红外气溶胶光学深度（AOT），以检查悬浮尘埃的昼夜变化，重点是三个独立的尘埃事件。将AERI尘埃AOT的取回与同时/并置多滤光片旋转阴影带辐射计（MFRSR），微脉冲激光雷达（MPL）和NASA云气溶胶激光雷达和红外探路者卫星观测（CALIPSO）传感器的AERI取回进行了比较。然后将检索到的AOT输入到Fu-Liou一维辐射传递模型中，以评估无云大气中尘埃在表面的局部瞬时直接长波辐射效应（DRELW）及其对尘埃微物理参数的敏感性。还评估了大气顶DRELW和长波加热速率曲线。瞬时表面DRELW的范围为2到10 W m（-2），并且与粉尘AOT表现出强烈的线性相关性，每单位粉尘AOT产生的DRELW为16 W m（-2）。据估计，DRELW与地表每日平均直接短波辐射效应的42％相似，但符号相反，部分补偿了短波损耗。作者肯定可以忽略不计，认为DRELW可以显着影响大气能，这是研究区域气候变化的重要组成部分。

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