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首页> 外文期刊>Theoretical and applied climatology >Assessing the sensitivity of lower atmospheric characteristics to agricultural land use classification over the Lower Mississippi River Alluvial Valley
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Assessing the sensitivity of lower atmospheric characteristics to agricultural land use classification over the Lower Mississippi River Alluvial Valley

机译：评估较低的密西西比河对外土地对农业土地的敏感性

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摘要

The Lower Mississippi River Alluvial Valley (LMRAV) is a key agricultural area within the USA, and although it receives a substantial level of annual rainfall, irrigation remains a requirement to sustain high productivity. Since a large percentage of irrigation comes from limited groundwater sources, predictions of surface and lower atmospheric characteristics associated with convective rainfall processes are critical for planning and managing water resources. While numerical weather models are a key tool in this prediction effort, there is considerable error in the models associated with the correct categorization of regional land use. This is especially true for the LMRAV, where most agricultural land is defined as dry cropland despite the extensive use of irrigation. To improve the accuracy of regional model simulations over the LMRAV, this study investigates the sensitivity of changing the dominate land use category from dry to irrigated cropland within a high-resolution Weather Research and Forecasting (WRF) model simulation. Based on a 5-month simulation (May-Sept. 2016) over the LMRAV, results of the study show that replacing dry cropland with irrigated cropland leads to substantial variations in the low-level thermal and moisture balances. In general, the northern LMRAV was shown to have the greatest increase (decrease) in latent (sensible) heat flux in August and September, with a corresponding increase in 2-m dew point temperature where latent heat flux increased. Additionally, boundary layer heights were shown to decrease over the northern LMRAV over the simulation, likely a result of decreased temperatures resulting from a dampened sensible heat flux.
机译：较低的密西西比河冲积谷（LMRAV）是美国的主要农业区，虽然它收到了大量的年降雨量，但灌溉仍然是维持高生产率的要求。由于大量的灌溉来自有限的地下水来源，因此与对流降雨流程相关的表面和较低的大气特性对规划和管理水资源至关重要。虽然数字天气模型是这种预测努力的关键工具，但在与区域土地使用的正确分类相关的模型中存在相当大的错误。对于LMRAV尤其如此，其中大多数农业用地被定义为干性农田，尽管灌溉使用广泛。为了提高LMRAV的区域模型模拟的准确性，本研究调查了在高分辨率的天气研究和预测（WRF）模型模拟​​中从干到灌溉农田改变灌溉土地使用类别的敏感性。基于5个月的模拟（2016年5月）在LMRAV上，研究结果表明，用灌溉农作物取代干燥农田导致低水平热和水分余额的大量变化。一般而言，北方LmRAV在8月和9月的潜伏（明智）热量通量中具有最大的增加（减少），相应增加2-M露点温度，其中潜热通量增加。另外，在模拟上显示边界层高度在北方LMRAV上减少，可能是由抑制明智的热通量导致的温度降低的结果。

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  • 来源
    《Theoretical and applied climatology》 |2020年第2期|305-320|共16页
  • 作者

    Dyer Jamie L.; Rigby James R.;

  • 作者单位

    Mississippi State Univ Dept Geosci 355 E Lee Blvd 108 Hilbun Hall Mississippi State MS 39762 USA;

    US Geol Survey Integrated Water Availabil Assessments Lower Mississippi Gulf Water Sci Ctr Oxford MS 38655 USA;

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