The Impact of Crop Areas in Northeast Colorado on Midsummer Mesoscale Thermal Circulations
The Impact of Crop Areas in Northeast Colorado on Midsummer Mesoscale Thermal Circulations
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科罗拉多州东北部农田对仲夏中尺度热环流的影响
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
J. Weaver
中科院分区：
文献类型：
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作者：
M. Segal;J. Garratt;R. Pielke;W. Schreiber;A. Rodi;G. Kallos;J. Weaver
摘要：本研究结合卫星、观测和建模方法，对邻近旱地的灌溉区产生的表面加热梯度所强制的中尺度环流进行了初步评估。选择科罗拉多州东北部的灌溉作物区进行研究。对于所研究的案例，卫星表面红外温度数据表明，灌溉区域和邻近旱地之间中午的典型温度对比约为 10 K。大气边界层下部区域内的表面观测和飞机测量通常表明存在显着的温度对比和湿度差异，从而暗示潜在的热驱动环流。然而，预期的热感应流在测量中仅通过对比位置的风速和风向的适度变化来反映。建议该地区白天、高架、地形强迫流动，...
Abstract The present study provides a preliminary evaluation of mesoscale circulations forced by surface gradients of heating arising from irrigated areas adjacent to dry land, utilizing a combination of satellite, observational, and modeling approaches. The irrigated crop areas of northeast Colorado were chosen for the study. For the cases studied satellite surface infrared temperature data indicated a typical temperature contrast of approximately 10 K at noon, between the irrigated area and the adjacent dry land. Surface observations and aircraft measurements within the lower region of the atmospheric boundary layer indicated, in general, a significant temperature contrast and moisture difference, thereby implying a potential thermally driven circulation. The anticipated thermally induced flows, however, were reflected in the measurements only by modest changes in the wind speed and wind direction across the contrast location. It is suggested that the daytime, elevated, terrain-forced flow in the area, ...