Cloud heights measured by MISR from 2000 to 2015
Cloud heights measured by MISR from 2000 to 2015
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2000年至2015年MISR测量的云高
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
C. Moroney
中科院分区：
文献类型：
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作者：
R. Davies;V. Jovanovic;C. Moroney
Davies和Molloy(2012年)报告说，在TERRA卫星的多角度成像光谱辐射仪(MISR)测量的头10 年中，全球有效云高度有所下降。我们重新检查了他们的时间序列，以寻找可能特别影响记录的初始部分的人工制品，当高度看起来异常高的时候。虽然采样的变化被证明是无关紧要的，但由于赤道穿越时间的变化而影响了头两个 年，因此发现了一个伪影，现在这一点已经得到纠正。这一修正，加上时间序列再延长五年，在TERRA运行的头15个 年期间，全球高度没有明显的整体趋势。时间序列被与拉尼娜事件相关的巨大年际波动所主导，这些波动掩盖了全球范围内的任何整体趋势。在区域基础上，云高度表现出显著的年际变化，幅度要大得多，有时区域之间的抵消相当直接。两个半球在身高异常的时间上存在无法解释的差异。这些差异在温带外大范围的纬度上持续存在，这表明存在遥相关。在热带地区，与中太平洋和印度尼西亚海洋大陆区域相关的非常强烈的变化彼此不同地振荡，年际幅度超过1 公里。
Davies and Molloy (2012) reported a decrease in the global effective cloud height over the first 10 years of Multiangle Imaging Spectroradiometer (MISR) measurements on the Terra satellite. We have reexamined their time series for possible artefacts that might especially affect the initial portion of the record when the heights appeared anomalously high. While variations in sampling were shown to be inconsequential, an artefact due to the change in equator crossing time that affected the first 2 years was discovered, and this has now been corrected. That correction, together with the extension of the time series by five more years, yields no significant overall trend in global heights during the first 15 years of Terra operation. The time series is dominated by large interannual fluctuations associated with La Niña events that mask any overall trend on a global scale. On a regional basis, the cloud heights showed significant interannual variations of much larger amplitude, sometimes with fairly direct cancellation between regions. There were unexplained differences between the two hemispheres in the timing of height anomalies. These differences persisted over a large range of extratropical latitudes, suggestive of teleconnections. Within the tropics, there were very strong changes associated with the Central Pacific and Indonesian Maritime Continent regions that oscillated out of phase with each other, with interannual amplitudes that exceeded 1 km.