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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Trends in ISCCP, MISR, and MODIS cloud-top-height and optical-depth histograms
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Trends in ISCCP, MISR, and MODIS cloud-top-height and optical-depth histograms

机译：ISCCP，MISR和MODIS云顶高度和光学深度直方图的趋势

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摘要

In this article, temporal changes in the Multiangle Imaging Spectro Radiometer (MISR) and Moderate Resolution Imaging Spectrometer (MODIS) joint histograms of cloud-top height (CTH) and optical depth (OD) over the period 2001 to 2011 are examined. The analysis shows no significant trend in total cloud cover averaged over all oceans between 60°N and 60°S from 2001 to 2011. There are, however, significant trends in the amount of some CTH-OD histogram components or cloud types. In particular, there was an increase in the amount of cloud with intermediate optical thickness (23 > OD > 3.6) and a decrease in the amount of the most optically thick cloud (OD > 23) over this period. The total cloud amount shows no trend because the increase in the amount of intermediate optically thick clouds is nearly balanced by the decrease in the amount of the most optically thick clouds. This balance is not due to a simple shift toward optically thinner clouds in all regions but has a complex spatial pattern both regionally and vertically. An examination of the geographic distribution of the change shows that the decrease in the amount of the most optically thick cloud occurred primarily in the extratropics. International Satellite Cloud Climatology Project (ISCCP) observations are briefly compared with those from MODIS and MISR. The comparison shows that ISCCP-retrieved total-cloud fraction is reasonably robust, but changes in the ISCCP component cloud fractions sometimes show large deviations from those of MISR and MODIS. Key PointsAn increase in cloud with OD < 23 but a decrease with OD > 23, 2001 to 2011Total cloud amount shows no global trend because these two trends nearly balanceISCCP total CF compares well with MISR and MODIS but component CFs don't
机译：在本文中，研究了2001年至2011年期间云顶高度（CTH）和光学深度（OD）的多角度成像光谱辐射仪（MISR）和中分辨率成像光谱仪（MODIS）联合直方图的时间变化。分析表明，从2001年到2011年，在60°N和60°S之间的所有海洋中，平均总云量没有显着趋势。但是，某些CTH-OD直方图分量或云类型的数量没有显着趋势。特别是，在此期间，具有中间光学厚度（23> OD> 3.6）的云量增加，而光学上最厚的云（OD> 23）量减少。总的云量没有趋势，因为中间光学厚度较厚的云量的增加几乎被最光学厚度较厚的云量的减少所平衡。这种平衡并不是由于在所有区域都简单地朝着光学上更薄的云移，而是在区域和垂直方向上都具有复杂的空间格局。对变化的地理分布的研究表明，光学上最厚的云的减少主要发生在温带。将国际卫星云气候学项目（ISCCP）的观测结果与来自MODIS和MISR的观测结果进行了简要比较。比较结果表明，从ISCCP检索到的总云部分具有一定的鲁棒性，但是ISCCP组件云部分的变化有时显示出与MISR和MODIS的较大偏差。关键点2001年至2011年，OD小于23的云量增加但OD大于23的云量减少没有云的全球趋势，因为这两个趋势几乎平衡ISCCP的总CF与MISR和MODIS的比较好，但分量CF没有

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