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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Reply to comment by Roberto Rondanelli and Richard S. Lindzenon 'Variations of tropical upper tropospheric clouds with sea surfacetemperature and implications for radiative effects'
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Reply to comment by Roberto Rondanelli and Richard S. Lindzenon 'Variations of tropical upper tropospheric clouds with sea surfacetemperature and implications for radiative effects'

机译：对罗伯托·朗达内利（Roberto Rondanelli）和理查德·林德森（Richard S. Lindzenon）的评论“热带对流层高空云层的海面温度变化及其对辐射效应的影响”

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Here, we further test if different data sets could causethe differences in the rates of relative change. We replicatethe analysis by RLO9's Figure 1 with the 1° x 1° griddedcloud fraction data from the Aqua Atmospheric InfraredSounder (AIRS) normalized by the TRMM precipitation. Thedaily AIRS UT (pressure < 300 hPa) cloud fraction normal-ized by precipitation shows a relative change of —18%/Kbased on the decaying exponential fit to all daily data fromJanuary to March (the same months as used by RL09) 2006,while the binned cloud fraction shows a relative change of—25%/K (Figure 1). Both rates are similar to the counterpartsfrom RL09. The correlation between the precipitation-normalized cloud fraction and SST is only —0.05. The ratesof change are rather sensitive to analysis periods and datauncertainties, but the sign is always negative. Therefore, adecrease of normalized cirrus fraction with increasing SSTappears to be robust, although different analysis methodol-ogies can give different magnitude of relative change.
机译：在这里，我们进一步测试不同的数据集是否会导致相对变化率的差异。我们将RLO9的图1的分析与通过TRMM降水归一化的Aqua Aqua Atmospheric InfraredSounder（AIRS）的1°x 1°网格云分数数据进行了复制。通过对2006年1月至3月（与RL09相同的月份）所有日常数据的衰减指数拟合，每日AIRS UT（压力<300 hPa）云量经降水归一化显示相对变化为-18％/ K。合并的云分数显示相对变化为-25％/ K（图1）。两种费率均与RL09的费率相似。降水归一化云量与SST的相关性仅为-0.05。变化率对分析周期和数据不确定性非常敏感，但符号始终为负。因此，尽管不同的分析方法可以给出不同的相对变化幅度，但随着SST的增加，归一化卷云分数的减小似乎是可靠的。

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