| Título: | Ensemble spread and systematic errors in the medium-range predictions during the Indian summer monsoon |
| Autores: |
KAR, S. C.; Centro de Ciencias de la Atmósfera, UNAM IYENGAR, G. R. BOHRA, K. |
| Fecha: | 2011-03-31 |
| Publicador: | Revistas UNAM |
| Fuente: |
 |
| Tipo: |
|
| Tema: | Forecast; rainfall; skill; spread; globa; model |
| Descripción: | For preparing medium range weather forecasts, two global coarse resolution models at different resolutions were used at the National Centre for Medium Range Weather Forecasting (NCMRWF), India. In order to improve the forecasting skill, an ensemble prediction system (EPS) was implemented on experimental basis. For generating initial perturbations a breeding method was implemented. Experimental forecast runs with 8-member ensemble were carried out and results are analyzed for a monsoon season. The ensemble mean of rainfall forecasts shows that over the broad region of Gangetic Plains, the EPS brings out the monsoon activity (active and weak spell) reasonably well six days in advance. However, over the eastern parts of India, the ensemble mean rainfall is good only in short-range. The ensemble spread becomes quite large from about day-4 forecast and beyond. An examination of the rainfall pattern from day-1 to day-6 forecasts by the model and the ensemble spread shows there is no linearity in the increase of spread with the rainfall amount. The model has a systematic tendency to enhance rainfall activity over the central Bay of Bengal and eastern parts of India as the length of forecast is increased. At the same time, the model tends to dry up over the equatorial Indian Ocean region, however, in the high-resolution model, the same tendency is not seen. In circulation fields, the model also has large systematic errors. These results suggest that to obtain maximum benefit from the ensemble prediction system, the systematic biases in the model must be reduced as the breeding method only takes care of the uncertainties in the initial conditions. |
| Idioma: | Inglés |
1 Ordered Hunt Schemes for Overlaid CDMA Cellular Systems,Esquemas de ordenamiento en sistemas celulares sobrepuestos CDMA por Castañeda Camacho, J; Benemérita Universidad Autónoma de Puebla, Puebla, México,Lara Rodríguez, D; IPN | 6 Model for Adjustment of Aggregate Forecasts using Fuzzy Logic,Modelo para el ajuste de pronósticos agregados utilizando lógica difusa por Escobar Gómez, E N; Instituto Tecnológico de Tuxtla Gutiérrez Chiapas,Díaz Núñez, J J; Universidad Autónoma de Ciudad Juárez Chihuahua,Taracena Sanz, L F; Instituto Tecnológico de Querétaro, Querétaro |
2 Volatile Organic Compound Emissions from Light-Duty Vehicles During Cold-Starts,Emisiones de compuestos orgánicos volátiles durante arranques en frío de automóviles ligeros por Mendoza Domínguez, A; Tecnológico de Monterrey, Campus Monterrey, Nuevo León, México,León Romero, M A; Tecnológico de Monterrey, Campus Monterrey, Nuevo León, México,Caballero Mata, P | 7 Matrix Formulation of Foundations for Vibrating Machinery in Frequency Domain,Formulación matricial de cimentaciones para maquinaria vibratoria en el dominio de la frecuencia por Carbajal Romero, M F; Instituto Politécnico Nacional. México DF,Rodríguez Castellanos, A; Instituto Mexicano del Petróleo. México DF,Rodríguez Sánchez, J E; Instituto Mexicano del Petróleo. México DF,Flores Méndez, E; IPN |
3 Hydrogen Sorption Properties of the Intermetallic Mg2Ni Obtained by Using a Simoloyer Ball Milling,Propiedades de ab-desorción de hidrógeno del intermetálico Mg2Ni obtenido empleando un molino de bolas Simoloyer por Martínez Franco, E; IPN,Klassen, T; GKSS, Research Center Geesthacht, Germany,Jaramillo Vigueras, D; IPN,Bormann, R; GKSS, Research Center Geesthacht, Germany | 8 Numerical Approach to an Outflow Hydrograph of a Dambreak,Estimación numérica del hidrograma de salida de una presa debido a su ruptura por Fuentes Mariles, O A; Universidad Nacional Autónoma de México,Arganis Juárez, M L; UNAM,De Luna Cruz, F; UNAM,Franco, V; UNAM |
4 Electrical Parameters Extraction of CMOS Floating-Gate Inverters,Extracción de parámetros eléctricos de inversores CMOS de compuerta flotante por Molinar Solís, J E; Universidad Autónoma del Estado de México,Ponce Ponce, V H; IPN,García Lozano, R Z; Universidad Autónoma del Estado de México,Díaz Sanchez, A; Instituto Nacional de Astrofísica, Óptica y Electrónica INAOE,Rocha Pérez, j M; Instituto Nacional de Astrofísica, Óptica y Electrónica INAOE | 9 Back Work Ratio of Brayton Cycle,La relación de trabajo de retroceso de un ciclo Brayton por Malaver de la Fuente, M; Universidad Marítima del Caribe, Venezuela |
5 Active Rectifier with Extended Functions: An Option to Voltage Sags Ride Through and Power Quality Improvement,Rectificador activo con funciones ampliadas: una alternativa para la compensación de sags de voltaje y mejorar la calidad de la red eléctrica por Núñez Gutiérrez, C A; Universidad Autónoma de San Luis Potosí, SLP,Lira Pérez, J; Universidad Autónoma de San Luis Potosí, SLP,Pazos Flores, F; Universidad Autónoma de San Luis Potosí, SLP,Echavarría Solís, R; Universidad Politécnica de Victoria, Ciudad Victoria, Tamaulipas | 10 Flood Predictions Combining Regional and Single Site Hydrometric Information,Predicción de crecientes combinando información hidrométrica local y regional por Campos Aranda, D F; Universidad Autónoma de San Luis Potosí |