Land-Atmosphere Interactions during GRAINEX: Planetary Boundary Layer Evolution in the Presence of Irrigation
Land-Atmosphere Interactions during GRAINEX: Planetary Boundary Layer Evolution in the Presence of Irrigation
复制标题
GRAINEX 期间的陆地-大气相互作用：灌溉条件下的行星边界层演化
DOI：
10.1175/jhm-d-21-0160.1
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发表时间：
2022
影响因子：
3.8
通讯作者：
Pielke, R. A.
中科院分区：
文献类型：
--
作者：
Rappin, E. D.;Mahmood, R.;Nair, U. S.;Pielke, R. A.
本文分析了大平原灌溉试验（GRAINEX）的观测结果，以更好地了解陆-气（L-A）相互作用和边界层演变。这项研究的重点是一天时，最大的强迫边界层起源于陆地表面/土地利用。为了研究这些影响，我们还应用了天气研究和预报（WRF）模型。结果表明，与非灌溉区相比，灌溉区的气温、风速和边界层高度（PBLH）较低，而露点温度和潜热通量较高。研究结果表明，夹带层干燥和灌溉和非灌溉地区的能量分配的差异发挥了重要作用PBL的演变。在一天的最后几个小时里，PBL在非灌溉地区比灌溉地区崩溃得更快。WRF模式的模拟结果与这些观测结果一致。他们还表明，在一个地区的灌溉程度[表示为灌溉分数（IF）]影响L-A响应。在60%IF下，潜热通量和混合比达到最大值，温度和PBLH最低，感热通量接近最低值。结果与≤ 2% IF相反。灌溉显著影响L-A相互作用和PBL演变。
This paper analyzed observations from the Great Plains Irrigation Experiment (GRAINEX) to better understand land–atmosphere (L–A) interactions and PBL evolution. This study is focused on a day when the largest forcing on the boundary layer originated from the land surface/land use. To examine these impacts, we also applied the Weather Research and Forecasting (WRF) Model. Results from the observations show that compared to nonirrigated areas, air temperature, wind speed, and PBL height (PBLH) were lower while dewpoint temperature and latent heat flux were higher over irrigated areas. Findings suggest that entrainment layer drying and differences in energy partitioning over irrigated and nonirrigated areas played an important role in PBL evolution. In the final hours of the day, the PBL collapsed faster over nonirrigated areas compared to irrigated. The WRF Model simulations agree with these observations. They also show that the extent of irrigation [expressed as irrigation fraction (IF)] in an area impacts L–A response. Under ∼60% IF, the latent heat flux and mixing ratio reach their highest value while temperature and PBLH are at their lowest, and sensible heat flux is near its lowest value. Results are reversed for ∼2% IF. It is concluded that irrigation notably impacts L–A interactions and PBL evolution.