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首页> 外文期刊>Geophysical Research Letters >Shortwave versus longwave direct radiative forcing by Taklimakan dust aerosols
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Shortwave versus longwave direct radiative forcing by Taklimakan dust aerosols

机译:塔克拉玛干粉尘气溶胶的短波与长波直接辐射强迫

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摘要

Six Mays from 2001 to 2006 of aerosol optical depth from the Multiangle Imaging SpectreRadiometer and short- and longwave flux from the Clouds and Earth's Radiant Energy Budget Scanner are combined to estimate radiative forcing of dust aerosols in the Taklimakan Desert (75°E-95°E, 36°N-42°N, elevation < 1600 m). The cloud-free dust shortwave versus longwave forcing per aerosol optical depth at about 05:00 UTC are -48.1 and 28.4 W m~(-2), respectively. Dust longwave warming offsets 58% of dust shortwave cooling and the overall dust radiative effect is to cool the Earth system. Annual shortwave and longwave forcing efficiencies vary from 26.7 to 63.8 and 18.3 to 39.3 W m~(-2), respectively, due to changes in surface properties. Radiative transfer model simulations also suggest Earth's system is cooled in the shortwave but warmed in the longwave by Taklimakan dust aerosols.
机译:从2001年至2006年6月的6月,利用多角度成像光谱辐射计的气溶胶光学深度以及来自云层和地球辐射能预算扫描仪的短波和长波通量,估算了塔克拉玛干沙漠中尘埃气溶胶的辐射强迫(75°E-95° E,36°N-42°N,海拔<1600 m)。在大约05:00 UTC时,每个气溶胶光学深度的无云尘埃短波与长波强迫分别为-48.1和28.4 W m〜(-2)。尘埃长波变暖抵消了尘埃短波冷却的58%,整个尘埃辐射作用是冷却地球系统。由于表面性质的变化,年短波和长波强迫效率分别从26.7至63.8和18.3至39.3 W m〜(-2)不等。辐射传递模型模拟还表明,塔克拉玛干尘埃气溶胶在短波中冷却了地球系统,但在长波中使地球系统变暖。

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