Results 121 to 130 of about 22,194 (261)

Scale-dependency of surface fluxes in an atmospheric mesoscale model: effect of spatial heterogeneity in atmospheric conditions [PDF]

open access: yesNonlinear Processes in Geophysics, 2008
We examined the nonlinear effect of spatial heterogeneity in atmospheric conditions on the simulation of surface fluxes in the mesoscale model, MM5 by testing their scale-invariance from a tower footprint to regional scales.
Jinkyu Hong, Joon Kim
doaj  

Study of ensemble forecasting based on different meteorological numerical products by using RBF artificial neural network(RBF神经网络集成多个气象数值产品的方法研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2006
对MM5V3模式中16组组合区域气候模拟试验所得的结果,分区域以RBF神经网络进行集成,分析了网络结构参数的不同对集成结果的影响,最后对整个区域的温度场进行了集成.结果表明:选择合适的网络结构参数是至关重要的,神经网络的非线性集成结果均明显优于单个参数化方案和16个方案线性集成的预测结果,整个区域的温度场集成结果比MM5模拟更接近于实况场,均方根误差场也较原MM5方案明显减小.这些结果对于区域气候的集成预测以及进一步优化神经网络的性能有一定的参考意义.
GAOLing-hua(高领花)   +2 more
doaj   +1 more source

Ensemble‐based simultaneous state and parameter estimation with MM5

open access: yesGeophysical Research Letters, 2006
The performance of the ensemble Kalman filter (EnKF) under imperfect model conditions is investigated through simultaneous state and parameter estimation for a numerical weather prediction model of operational complexity (MM5). The source of model error is assumed to be the uncertainty in the vertical eddy mixing coefficient.
Altuğ Aksoy   +2 more
openaire   +1 more source

The inflow signature toward different evolutionary phases of massive star formation

open access: yes, 2016
We analyzed both HCN J=1-0 and HNC J=1-0 line profiles to study the inflow motions in different evolutionary stages of massive star formation: 54 infrared dark clouds (IRDCs), 69 high-mass protostellar object (HMPOs), and 54 ultra-compact HII regions ...
Evans II, Neal J.   +3 more
core   +1 more source

Evaluation of WRF mesoscale simulations and particle trajectory analysis for the MILAGRO field campaign [PDF]

open access: yesAtmospheric Chemistry and Physics, 2009
Accurate numerical simulations of the complex wind flows in the Mexico City Metropolitan Area (MCMA) can be an invaluable tool for interpreting the MILAGRO field campaign results.
B. de Foy   +3 more
doaj  

Temperature sensitivity to the land-surface model in MM5 climate simulations over the Iberian Peninsula

open access: yesMeteorologische Zeitschrift, 2010
Three different Land Surface Models have been used in three high resolution climate simulations performed with the mesoscale model MM5 over the Iberian Peninsula.
Sonia Jerez   +5 more
doaj   +1 more source

敦煌莫高窟顶风沙综合防护体系固沙效应的数值模拟

open access: yesShuitu Baochi Xuebao, 2005
结合中尺度大气模式MM5和Shao的风蚀起沙方案,对敦煌莫高窟顶灌木林带和草方格沙障的固沙效应进行数值模拟研究。结果表明:灌木林带的建立,使其地表风蚀起沙的临界摩擦速度(ut)达到1.15m/s,是林带建立前的4.1倍,地表的顺风向沙粒通量(Q)和垂直尘粒通量(F)均减小为0,完全抑制了地表风蚀起沙;草方格沙障的设置,使ut达到0.53m/s,为设置前的1.9倍,Q和F分别减少约3/5和7/8,固沙效果非常明显。一般情况下,ut不会大于1.0m/s,充分说明灌木林带比草方格具有更强的固沙效果 ...
汪万福 申彦波 王涛 沈志宝 杜明远
doaj  

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