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Dynamic downscaling of the twentieth-century reanalysis over the southeastern United States

机译：美国东南部20世纪再分析的动态缩减

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摘要

A 108-year (1901-2008) downscaling of the twentieth-century reanalysis (20CR) using the Regional Spectral Model (RSM) has been conducted for the southeastern United States (SEUS) at a horizontal grid resolution of 10 km. This108-year product, named as the Florida Climate Institute-Florida State University Land-Atmosphere Reanalysis for the southeastern United States at 10-km resolution version 1.0 [FLAReS1.0], has primarily been developed for anticipated application studies in hydrology, crop management, ecology, and other interdisciplinary fields in the SEUS. The analysis of this downscaled product reveals that it ameliorates the issue of artificial discontinuity in the precipitation time series of the 20CR from the variations inherent to RSM. This centennial scale product allows us to begin examining decadal scale variations of the regional features of the SEUS. The fidelity of the low-frequency variations of the winter rainfall associated with the Atlantic Multi-decadal Oscillation (AMO) and the Pacific Decadal Oscillation is reasonably well captured in FLAReS 1.0. In fact, the modulation of the El Nino-Southern Oscillation (ENSO) teleconnection with the SEUS rainfall by AMO in the downscaled product is also validated with observations. The ENSO-associated variations of accumulated rainfall from landfalling hurricanes in the SEUS are also well simulated in the downscaled climate simulation. It is to be noted that the success of this dynamical downscaling is also because the global reanalysis of 20CR showed comparable fidelity in these low-frequency variations of the SEUS climate. This method of dynamic downscaling global reanalysis with inclusion of spectral nudging at large wavelengths (in this case ≥500 km) toward the driving global reanalysis (20CR) is sometimes referred as a form of regional reanalysis.
机译：美国东南（SEUS）使用区域光谱模型（RSUS）对20世纪重新分析（20CR）进行了108年（1901-2008）缩减，水平网格分辨率为10 km。这款具有108年历史的产品被称为美国东南部佛罗里达气候研究所-佛罗里达州立大学陆地大气再分析，分辨率为10 km，版本为1.0 [FLAReS1.0]，主要用于水文，作物管理方面的预期应用研究，生态学以及SEUS中的其他跨学科领域。对这种降级产品的分析表明，它通过RSM固有的变化改善了20CR降水时间序列中人为间断的问题。这个百年尺度产品使我们可以开始研究SEUS区域特征的年代尺度变化。在FLAReS 1.0中可以很好地捕获与大西洋多年代际涛动（AMO）和太平洋年代际涛动相关的冬季降雨的低频变化保真度。实际上，在缩小规模的产品中，AMO通过SEUS降雨对El Nino-Southern Oscillation（ENSO）遥相关的调制也得到了观测的验证。在降尺度的气候模拟中也很好地模拟了SESO中ENSO相关的登陆飓风累积降雨的变化。应当指出的是，这种动态缩减的成功也是因为20CR的全球再分析在SEUS气候的这些低频变化中显示了可比的保真度。这种动态缩减全局重新分析的方法，其中包括将大波长（在这种情况下≥500 km）的光谱裸露移向驱动全局重新分析（20CR），有时被称为区域重新分析的一种形式。

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  • 来源
    《Regional Environmental Change》 |2013年第1期|S15-S23|共9页
  • 作者

    V. Misra; S. M. DiNapoli; S. Bastola;

  • 作者单位

    Department of Earth, Ocean and Atmospheric Science,Florida State University, P.O. Box 3064520,Tallahassee, FL 32306-4520, USA,Center for Ocean-Atmospheric Prediction Studies, Florida State University, 2035 E. Paul Dirac Dr., 200 RM Johnson Bldg,Tallahassee, FL 32306-2840, USA,Florida Climate Institute, Florida State University,2035 E. Paul Dirac Dr., 200 RM Johnson Bldg,Tallahassee, FL 32306-2840, USA;

    Center for Ocean-Atmospheric Prediction Studies, Florida State University, 2035 E. Paul Dirac Dr., 200 RM Johnson Bldg,Tallahassee, FL 32306-2840, USA;

    Center for Ocean-Atmospheric Prediction Studies, Florida State University, 2035 E. Paul Dirac Dr., 200 RM Johnson Bldg,Tallahassee, FL 32306-2840, USA;

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  • 正文语种 eng
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  • 关键词

    Atlantic multi-decadal oscillation; Hurricanes; Pacific Decadal Oscillation;

    机译：大西洋多年代际振荡;飓风太平洋年代际振荡;

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