Aerosol indirect effects in POLDER satellite data and the Laboratoire de Meteorologie Dynamique-Zoom (LMDZ) general circulation model -: art. no. D08205
Aerosol indirect effects in POLDER satellite data and the Laboratoire de Meteorologie Dynamique-Zoom (LMDZ) general circulation model -: art. no. D08205
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DOI：
10.1029/2003jd004317
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发表时间：
2004-04-22
影响因子：
4.4
通讯作者：
Bréon, FM
中科院分区：
文献类型：
--
作者：
Quaas, J;Boucher, O;Bréon, FM
[1]POLDER-1仪器能够在1996 - 1997年期间连续8个月测量气溶胶和云的特性。我们使用这些观测数据的气溶胶浓度（气溶胶指数），云光学厚度，云滴有效半径，建立这些参数之间的统计关系，以分析第一和第二气溶胶间接效应。我们还评估了这些影响的代表性参数化的气象动态缩放（LMDZ）大气环流模式。我们发现，在云顶水滴半径减少，增加气溶胶指数在模式和观测。如果在固定的云液态水路径（LWP）而不是考虑所有的LWP条件下进行分析，我们的结果只有轻微的变化。我们还发现气溶胶指数和云液态水路径之间的正相关，这是特别明显的北方中纬度地区。这可以解释为第二个气溶胶间接效应在大尺度上的观测证据。模型模拟的关系与POLDER数据吻合得很好。模型模拟表明，如果使用工业化前而不是现在的气溶胶分布，这两种关系的变化相当小。然而，当完全关闭我们的模型中的第二个气溶胶间接效应时，我们发现比包括它时更陡的斜率。
[1] The POLDER-1 instrument was able to measure aerosol and cloud properties for eight months in 1996 - 1997. We use these observational data for aerosol concentration ( the aerosol index), cloud optical thickness, and cloud droplet effective radius to establish statistical relationships among these parameters in order to analyze the first and second aerosol indirect effects. We also evaluate the representation of these effects as parameterized in the Laboratoire de Meteorologie Dynamique - Zoom (LMDZ) general circulation model. We find a decrease in cloud top droplet radius with increasing aerosol index in both the model and the observations. Our results are only slightly changed if the analysis is done at fixed cloud liquid water path (LWP) instead of considering all LWP conditions. We also find a positive correlation between aerosol index and cloud liquid water path, which is particularly pronounced over the Northern Hemisphere midlatitudes. This may be interpreted as observational evidence for the second aerosol indirect effect on a large scale. The model-simulated relationship agrees well with that derived from POLDER data. Model simulations show a rather small change in the two relationships if preindustrial rather than present-day aerosol distributions are used. However, when entirely switching off the second aerosol indirect effect in our model, we find a much steeper slope than we do when including it.