The importance of the diurnal cycle of Aerosol Optical Depth in West Africa
The importance of the diurnal cycle of Aerosol Optical Depth in West Africa
复制标题
西非气溶胶光学深度昼夜周期的重要性
DOI：
10.1002/grl.50143
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发表时间：
2013
影响因子：
5.2
通讯作者：
C. Flamant
中科院分区：
文献类型：
--
作者：
C. Kocha;P. Tulet;J. Lafore;C. Flamant
高分辨率大气模拟与AROME模式加上一个灰尘模块在西非整个2006年6月被用来计算气溶胶光学厚度（AOT）。模拟结果表明，一个显着的日周期为0.2的尘埃AOT，不能推断出从中分辨率成像光谱仪深蓝检索，由于他们的时间。沙尘源主要由清晨低空急流的分解和下午的湿对流驱动，导致相反的日周期。此外，模拟表明，云层覆盖显着阻止AOT的观测。卫星对日周期的欠采样加上云罩对星载AOT反演的影响，导致对流区低估0.28（~40%），而在Bodélé等早晨源区高估0.1（17%）。观测和高分辨率模式的结合可以限制偏差，并提供更真实的AOT气候学。
High resolution atmospheric simulations with the AROME model coupled with a dust module over West Africa for the whole of June 2006 were used to calculate aerosol optical thickness (AOT). Simulations showed a significant diurnal cycle of 0.2 in the dust AOT that could not be inferred from the MODIS Deep Blue retrievals due to their timings. Dust sources are mainly driven by the breakdown of the early morning low‐level jet and by moist convection in the afternoon, leading to opposite diurnal cycles. Also, simulations show that cloud cover significantly prevents the observation of AOT. The under‐sampling of the diurnal cycle by satellites plus the impact of cloud masks on the space‐borne AOT retrievals induce an underestimation of 0.28 (~40%) over the convective regions and an overestimation of 0.1 (17%) over morning source areas like Bodélé. A combination of observations and high‐resolution models could constrain bias and give a more realistic AOT climatology.
影响因子：
14.6
作者：
Martijn Gough
通讯作者：
Martijn Gough
影响因子：
4.4
作者：
Knippertz, P.;Deutscher, C.;Schuetz, L.
通讯作者：
Schuetz, L.