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ISSN 1006-9895

CN 11-1768/O4

植被覆盖率对内蒙古沙尘天气影响的模拟研究
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作者单位:

1.内蒙古自治区气象科学研究所;2.内蒙古自治区气象台;3.内蒙古自治区气候中心

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国家自然科学基金,省自然科学基金


A Study on the Effects of Vegetation on Dust Weather in Inner Mongolia
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Affiliation:

1.Regional Meteorological Observatory of Inner Mongolia Autonomous Region;2.Inner Mongolia Autonomous Region Climate Centre;3.Meteorogical Research Institude of Inner Mongolia Autonomous

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    摘要:

    利用WRF-chem模式及不同植被覆盖率的敏感试验,模拟了内蒙古地区一次典型沙尘过程,研究了植被覆盖率对沙尘天气强度演变及远距离传输的影响。结果表明:耦合Shao_04起沙参数化方案的WRF-chem模式能较好地再现实际沙尘输送过程。当沙源地植被覆盖率增加5%,起沙总量削减50%,下游地区地面沙尘浓度的削减>80%,PM10与PM2.5浓度的削减接近或超过80%,空气质量由严重污染降低到轻度污染,有效改善了大气环境;当植被覆盖率增加≥15%,大粒径沙粒贡献率逐渐增加,沙尘输送过程中沉降速率增加,导致下游地区沙尘天气峰值浓度提前。可以初步得出结论,植被覆盖率增加,叶面积指数增大,植被对细粒子的捕获作用增强。所以,植树造林等荒漠化治理工作应该首先在细粒子为主的半荒漠化地区开展。

    Abstract:

    Using the WRF-chem model and sensitive tests of different vegetation coverage, a typical dust process in Inner Mongolia was simulated, and the influence of vegetation coverage on the evolution of dust weather intensity and long-distance transportation was studied. The results show that: the WRF-chem coupled with Shao_04 sand parameterization scheme can better reproduce the actual dust transportation. Sensitivity experiments of different vegetation coverage found when vegetation coverage of sand source area was increased by 5%, the total amount dust was reduced by 50%; the reduction of surface dust concentration including PM10 and PM2.5 in downstream area was more than 80% or close to 80%; the air quality was reduced from serious pollution to light pollution, which effectively improved the atmospheric environment. When vegetation coverage was increased by 15% or more, the contribution rate of large grain sand particles gradually increased, and the sedimentation rate increased during dust transportation leading to the advance of the peak concentration of dust weather in the downstream areas. The vegetation coverage increased, the leaf area index increased, and the capture effect of vegetation on fine particles was enhanced. It can be preliminarily concluded that desertification control projects such as afforestation should first be carried out in semi-desertification areas with fine particles.

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历史
  • 收稿日期:2022-01-22
  • 最后修改日期:2022-04-25
  • 录用日期:2022-06-16
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