The effects of microphysical parameterization on model predictions of sulfate production in clouds
The effects of microphysical parameterization on model predictions of sulfate production in clouds
复制标题
微物理参数化对云中硫酸盐生成模型预测的影响
DOI：
10.3402/tellusb.v42i3.15220
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发表时间：
1990
期刊：
影响因子：
2.3
通讯作者：
T. Larson
中科院分区：
文献类型：
--
作者：
D. Hegg;T. Larson
硫酸盐生产的一个明确的云化学参数化模型预测与相应的预测散装化学模式进行了比较。在高SO2和H2 O2条件下，各种模型的预测结果基本一致.对于低H2 O2的条件下，显式微物理模型预测硫酸盐产量高达30倍高于散装模型，虽然更常见的差异是一个因素的顺序为3。差异的出现是因为液滴中pH值的大小依赖性分布，这反过来又是硫酸根和铵离子的大小依赖性分布的结果。不同的铵和硫酸根离子的尺寸依赖性分布的实验证据进行审查，并与模型预测相比。硫酸盐生产的比较结果表明，散装云水pH值并不总是一个可靠的指标，在云中的水反应条件。与此相关的是，臭氧氧化的水S（IV）似乎比散装云水的pH值测量所建议的更重要。DOI：10.1034/j.1600-0889.1990.t01-2-00006.x
Model predictions of sulfate production by an explicit cloud chemistry parameterization are compared with corresponding predictions by a bulk chemistry model. Under conditions of high SO 2 and H 2 O 2 , the various model predictions are in reasonable agreement. For conditions of low H 2 O 2 , the explicit microphysical model predicts sulfate production as much as 30 times higher than the bulk model, though more commonly the difference is of the order of a factor of 3. The differences arise because of the size-dependent distribution of pH in the droplets, which is in turn a consequence of the size-dependent distributions of sulfate and ammonium ions. Experimental evidence for differing size-dependent distributions of ammonium and sulfate ions is reviewed and compared with model predictions. The results of the sulfate production comparison suggest that bulk cloud water pH is not always a reliable indicator of aqueous reaction conditions in clouds. Related to this, the ozone oxidation of aqueous S(IV) appears to be of more significance than would be suggested by pH measurements of bulk cloud water. DOI: 10.1034/j.1600-0889.1990.t01-2-00006.x