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Intercomparison of global cloud cover fields over oceans from VOS observations and NCEP/NCAR reanalysis

机译:通过VOS观测和NCEP / NCAR再分析对海洋上的全球云量覆盖范围进行比对

摘要

The paper inter-compares the total cloud cover over the World Ocean from marine visual observations assimilated in the International Comprehensive Ocean-Atmosphere Data Set (ICOADS) and National Centers of Environmental Prediction/National Center of Atmospheric Research (NCEP-NCAR) reanalysis. The Intercomparison covers the period from 1948 to 2002. NCEP-NCAR reanalysis shows about 10% of fractional cloud cover smaller than the visual observations do. The largest differences are observed in the mid and sub-polar latitudes. In the tropics, NCEP-NCAR data show slightly higher cloud cover then ICOADS. These systematic differences are quite persistent through the year with somewhat stronger differences in summer. Comparison of the characteristics of inter-annual variability shows little consistency between visually observed total cloud cover and total cloudiness diagnosed by the reanalysis. Linear trends are primarily positive in the ICOADS cloud data, while in the NCEP-NCAR reanalysis they show downward trends in the tropics and upward tendencies in the mid and high latitudes. Analysis of the effect of sampling in ICOADS shows that sampling inhomogeneity cannot fully explain the disagreements observed. At the same time, the major climate variability patterns such as North Atlantic Oscillation (NAO) and El-Nino—Southern Oscillation (ENSO) are well captured in both ICOADS and NCEP-NCAR cloud cover data sets
机译:本文通过国际海洋综合大气数据集(ICOADS)和国家环境预测中心/国家大气研究中心(NCEP-NCAR)重新分析得到的海洋视觉观测结果,对世界海洋的总云量进行了比较。比对涵盖了从1948年到2002年的这段时期。NCEP-NCAR的重新分析表明,约10%的分数云覆盖率小于目测观测结果。在中极和亚极纬度地区观察到最大的差异。在热带地区,NCEP-NCAR数据显示云量略高于ICOADS。这些系统性差异贯穿全年,而夏季则有所增强。年际变化特征的比较表明,目视观察到的总云量和重新分析诊断出的总云量之间几乎没有一致性。线性趋势在ICOADS云数据中主要为正,而在NCEP-NCAR重新分析中,线性趋势在热带地区呈下降趋势,在中高纬度地区呈上升趋势。对ICOADS中采样效果的分析表明,采样的不均匀性无法完全解释所观察到的分歧。同时,ICOADS和NCEP-NCAR云盖数据集都很好地捕获了主要的气候变化模式,例如北大西洋涛动(NAO)和厄尔尼诺-南方涛动(ENSO)

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