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Impact of land surface processes on the South American warm season climate

机译:地表过程对南美暖季气候的影响

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摘要

The present study demonstrates that (1) the simulation of the South American warm season (December-February) climate by an atmospheric general circulation model (AGCM) is sensitive to the representation of land surface processes, (2) the sensitivity is not confined to the "hot spot" in Amazonia, and (3) upgrading the representation of those processes can produce a significant improvement in AGCM performance. The reasons for sensitivity and higher success are investigated based on comparisons between observational datasets and simulations by the AGCM coupled to either a simple land scheme that specifies soil moisture availability or to the Simplified Simple Biosphere Model (SSiB) that allows for consideration of soil and vegetation biophysical process. The context for the study is the UCLA AGCM. The most notable simulation improvements are along the lee of the Andes in the lower troposphere, where poleward flow transports abundant moisture from the Amazon basin to high latitudes, and in the monsoon region where the intensity and pattern of precipitation and upper level ice water content are more realistic. It is argued that a better depiction of the Chaco Low, which is controlled by local effects of land surface processes, decisively contributes to the superior model performance with low-level flows in central South America. The better representation of the atmospheric column static stability and large-scale moisture convergence in tropical South America contribute to more realistic precipitation over the monsoon region. The overall simulation improvement is, therefore, due to a combination of different regional processes. This finding is supported by idealized AGCM experiments.
机译:本研究表明(1)通过大气总循环模型(AGCM)对南美暖季(12月至2月)气候的模拟对地表过程的表示很敏感,(2)敏感性不限于(3)升级这些流程的表示形式可以显着改善AGCM的性能。基于AGCM的观测数据集和模拟之间的比较,研究了敏感性和更高成功的原因,再加上指定土壤水分可用性的简单土地方案或考虑土壤和植被的简化简单生物圈模型(SSiB)生物物理过程。这项研究的背景是加州大学洛杉矶分校的AGCM。最显着的模拟改进是在对流层下沿安第斯山脉的风向,极向流将丰富的水分从亚马逊河盆地输送到高纬度地区,在季风区,降水的强度和模式以及上层冰水含量为更现实。有人认为,受地表过程局部影响控制的Chaco Low的更好描述,决定性地有助于南美洲中部低水平流量带来的卓越模型性能。南美热带地区大气柱静态稳定性的更好表示和大规模的水分汇聚有助于季风地区的更现实的降水。因此,总体模拟的改进是由于不同区域过程的结合。这一发现得到了理想化AGCM实验的支持。

著录项

  • 来源
    《Climate dynamics》 |2011年第2期|p.187-203|共17页
  • 作者单位

    Department of Atmospheric and Oceanic Sciences,University of California Los Angeles, Los Angeles, CA, USA;

    Department of Atmospheric and Oceanic Sciences,University of California Los Angeles, Los Angeles, CA, USA;

    Department of Atmospheric and Oceanic Sciences,University of California Los Angeles, Los Angeles, CA, USA,Department of Geography, University of California Los Angeles,Los Angeles, CA, USA;

    Department of Atmospheric and Oceanic Sciences,University of California Los Angeles, Los Angeles, CA, USA;

    Department of Atmospheric and Oceanic Sciences,University of California Los Angeles, Los Angeles, CA, USA;

    Jet Propulsion Laboratory, California Institute of Technology,Pasadena, CA, USA;

    Department of Geography, University of California Los Angeles,Los Angeles, CA, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    land surface processes; AGCM; south american monsoon; SACZ; chaco low;

    机译:地表过程;AGCM;南美季风SACZ;查科低;

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