Saharan dust transport to the caribbean during PRIDE: 2. Transport, vertical profiles, and deposition in simulations of in situ and remote sensing observations : Puerto Rico Dust Experiment (PRIDE1)
Saharan dust transport to the caribbean during PRIDE: 2. Transport, vertical profiles, and deposition in simulations of in situ and remote sensing observations : Puerto Rico Dust Experiment (PRIDE1)
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DOI：
10.1029/2002jd002659
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发表时间：
2003-10
影响因子：
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通讯作者：
P. Colarco;P. Colarco;O. B. Toon;J. Reid;J. Livingston;P. Russell;J. Redemann;B. Schmid;H. Maring;D. Savoie;E. Welton;E. Welton;J. Campbell;B. Holben;R. Levy
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文献类型：
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作者：
P. Colarco;P. Colarco;O. B. Toon;J. Reid;J. Livingston;P. Russell;J. Redemann;B. Schmid;H. Maring;D. Savoie;E. Welton;E. Welton;J. Campbell;B. Holben;R. Levy
我们模拟撒哈拉沙漠沙尘输送过程中的波多黎各沙尘实验（2000年6月至7月）与三维气溶胶输送模式同化气象学驱动。该模型在定位从非洲出现的尘埃羽流方面做得很好，但在北大西洋西部将其向南输送的距离比卫星图像中看到的要远。该模型是能够模拟低级别，均匀混合，并在波多黎各类似的观察PRIDE升高垂直粉尘层配置文件。我们确定，在整个北大西洋的灰尘垂直剖面的变化是最强烈的相关性下降的灰尘在运输过程中，而不是低层运输直接从源区的沉积和向下的垂直风。除湿在调节这一过程中起着关键作用。假设我们的灰尘是3.5%的铁质量，我们估计2000年7月铁沉积到北大西洋之间的0.71和0.88 Tg，这是一致的估计来自观测到的表面灰尘质量浓度。我们估计，如果每年的灰尘沉积量保持不变，是我们2000年7月估计值的5倍，那么每100万年，在佛罗里达半岛上就有1米的撒哈拉灰尘沉积物积累。
We simulate Saharan dust transport during the Puerto Rico Dust Experiment (June-July 2000) with a three-dimensional aerosol transport model driven by assimilated meteorology. The model does a reasonable job of locating the dust plume as it emerges from Africa but transports it somewhat farther south in the western North Atlantic Ocean than is seen in satellite imagery. The model is able to simulate low-level, uniformly mixed, and elevated vertical dust layer profiles over Puerto Rico similar to observations made in PRIDE. We determine that the variability in the dust vertical profile across the North Atlantic Ocean is most strongly associated with descent of the dust by sedimentation and downward vertical winds during transit rather than low-level transport directly from source regions. Wet removal plays a key role in modulating this process. Assuming our dust is 3.5% iron by mass, we estimate July 2000 iron deposition into the North Atlantic Ocean to be between 0.71 and 0.88 Tg, which is consistent with estimates derived from observed surface dust mass concentrations. We estimate that if annual dust deposition remains constant at five times our July 2000 estimates, there is an accumulation of 1 m of sediment from Saharan dust over the Florida peninsula every one million years.