Contributions from California Coastal-Zone Surface Fluxes to Heavy Coastal Precipitation: A CALJET Case Study during the Strong El Niño of 1998
Contributions from California Coastal-Zone Surface Fluxes to Heavy Coastal Precipitation: A CALJET Case Study during the Strong El Niño of 1998
复制标题
加州沿海地区地表通量对沿海强降水的贡献：1998 年强厄尔尼诺期间的 CALJET 案例研究
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
F. Ralph
中科院分区：
文献类型：
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作者：
P. Persson;P. Neiman;B. Walter;J. Bao;F. Ralph
摘要分析1998年2月3日厄尔尼诺冬季期间加州湾的一个广泛的观测系统，发现距海岸150公里范围内的表面感热和潜热通量对空气的不稳定起了很大的作用，随后沿沿着产生了强对流和洪水。飞机，投下式探空仪，和卫星观测收集近海记录的海面温度（SST），表面通量，分层，锋面结构。这些被用来外推的影响，通量的暖部门，边界层空气提前的二次冷锋，因为这种空气向海岸移动。外推的结构，然后详细验证与近岸飞机，风廓线仪，探空和浮标观测的锋面对流沿着海岸，和轨迹转换与模型模拟确认。结果表明，地表通量使CAPE增加了26%左右，使N2的浓度增加了20%左右。
Abstract Analysis of the case of 3 February 1998, using an extensive observational system in the California Bight during an El Nino winter, has revealed that surface sensible and latent heat fluxes within 150 km of the shore contributed substantially to the destabilization of air that subsequently produced strong convection and flooding along the coast. Aircraft, dropsonde, and satellite observations gathered offshore documented the sea surface temperatures (SSTs), surface fluxes, stratification, and frontal structures. These were used to extrapolate the effects of the fluxes on the warm-sector, boundary layer air ahead of a secondary cold front as this air moved toward the coast. The extrapolated structure was then validated in detail with nearshore aircraft, wind profiler, sounding, and buoy observations of the frontal convection along the coast, and the trajectory transformations were confirmed with a model simulation. The results show that the surface fluxes increased CAPE by about 26% such that the n...