Showing papers in "Atmospheric Science Letters in 2010"

TL;DR: In this article, the cold temperatures from North America to Europe and Asia during the period of 28 December 2009 to 13 January 2010 are associated with extremely negative values of the North Atlantic Oscillation (NAO) index, which produce northerly surface wind anomalies and cause the southward advection of the cold Arctic air.

TL;DR: In this paper, a cloud-resolving model is used to simulate this extreme rainfall event and understand the dynamic aspect under this event, and the overall numerical results indicate that it is the interaction among the typhoon, monsoon system, and local terrain that led to this extreme event.

TL;DR: The COST-731 action as mentioned in this paper focused on uncertainty propagation in hydrometeorological forecasting chains and five foci for discussion and research have been identified: (1) understand uncertainties, (2) exploring, designing and comparing methodologies for the use of uncertainty in hydrological models, (3) providing feedback on sensitivity to data and forecast providers, transferring methodologies among the different communities involved and (4) setting up test-beds and perform proof-of-concepts.

TL;DR: In this paper, the authors analyse the regional-scale pattern of low troposphere dynamics and convective activity associated with weak and strong phases of the Saharan heat low during the summer, using 18 years of concomitant European Centre for Medium-range Weather Forecasts re-analysis data and satellite observations of brightness temperature provided by the European Union-funded Cloud Archive User Service.

TL;DR: This paper presents a strategy for diagnostic verification of hydrologic ensembles, based on the selection of summary verification metrics and the analysis of the relative contribution of the different sources of error, with a case study of experimental precipitation and streamflow ensemble reforecasts over a 24-year period.

TL;DR: In this paper, a case study using the TIGGE database for flood warning in the Upper Huai catchment (ca. 30 672 km2) was presented, where 6 meteorological centres with 10-day lead time were extracted and disaggregated to drive the Xinanjiang model to forecast discharges for flood events in July-September 2008.

TL;DR: In this article, the transferability of the EFAS-methodologies to equatorial African basins is assessed with the analysis of the Juba-Shabelle river basin as an example using a variety of different meteorological data sources.

TL;DR: In this article, the changes of light rain events from 1973-2009 over North America, Europe and Asia were investigated using long-term daily precipitation data from NCDC, and the authors found that light rain days showed an overwhelming decrease trend with high spatial coherency.

TL;DR: COST731 was established to study the propagation of uncertainty from hydrometeorological observations through meteorological and hydrological models to the final flood forecast and has assembled a number of demonstrations/case studies that illustrate a variety of practical approaches.

TL;DR: In this paper, the potential impact of particle number concentrations derived from biofuel vehicles on existing regulatory concerns over atmospheric nanoparticles was discussed, and the potential effect of the particle number concentration derived from fuel-powered vehicles on the regulatory concerns was discussed.

TL;DR: AO-like pattern has had a dominant influence on the NH-mean temperature since the late 1980s, whereas the influence of the Pacific Decadal Oscillation (PDO) has weakened as mentioned in this paper.

TL;DR: In this paper, a comparative analysis is conducted to assess the quality of streamflow forecasts issued by two different modeling conceptualizations of catchment response, both driven by the same weather ensemble prediction system (PEARP Meteo-France).

TL;DR: In this paper, the authors identify atmospheric characteristics associated with austral summer extreme precipitation over part of Southeastern Brazil and find that extreme precipitation was associated with anomalous circulation over the region, forced by a PSA-like wavetrain intensified by the Southern Annular Mode.

TL;DR: In this article, a robust method for precise determination of atmospheric boundary layer (ABL) top from COSMIC global positioning system radio occultation measurements is introduced, making detection of even small transitions possible.

TL;DR: The COST-731 Action is focused on uncertainty propagation in hydrometeorological forecasting chains as discussed by the authors, which can be subdivided by describing and studying the impact of imperfect observations, mostly from radar, exploiting radar data assimilation as a promising avenue for improved short-range precipitation forecasts and high-resolution ensemble forecasting.

TL;DR: In this paper, a broad review of the pre-and post-processor methods for ensemble streamflow prediction using a Korean case study was conducted, which showed that use of the post-processors more effectively reduced the uncertainty of the no-processor ESP than use of pre-processor, especially in dry season.

TL;DR: The first workshop on Postprocessing and Downscaling Atmospheric Forecasts for Hydrologic Applications was held at Meteo France, Toulouse, France, 15-18 June 2008 as mentioned in this paper.

TL;DR: In this article, a global chemistry transport model is employed to investigate the impact of recent laboratory determinations of photolysis parameters for formaldehyde on concentrations of tropospheric trace gases.

TL;DR: In this paper, high-resolution (5-km, 30-min) Meteosat 7 infrared images are used to document seasonal variations of the diurnal cycle of convective activity over Cameroon and Nigeria during the period 1998-2002.

TL;DR: In this paper, the authors examined the long-term trends of the winter monsoon northeasterly cold surge and Borneo vortex over the South China Sea and found that there has been a significant increase in the frequency of the Borneon vortex within the study period of 1962-2007.

TL;DR: A review of commonly used approaches and connected difficulties is made in this article, where the challenges in hydrological applications using the quality index (QI) are listed, as the technique is used to generate precipitation field ensembles.

TL;DR: In this paper, a large eddy simulation (LES) of a well-developed convective boundary layer (CBL) under no mean wind condition was performed with the Weather Research and Forecasting model in order to investigate the mechanisms for the intensification and maintenance of dust devils.

TL;DR: In this article, the Safran-Isba-Modcou (SIM) distributed hydro-meteorological modeling suite is developed at Meteo-France and two ensemble forecasts are tested as input to the SIM suite.

TL;DR: In this article, the authors found that there is a radius within which the sea surface flux for moist enthalpy plays a vital role in determining the intensity of a tropical cyclone.

TL;DR: In this article, the authors report on the first tracer dispersion experiment carried out in May 2003 and compare the results of concurrent meteorological measurements with a simple dispersion model and maximum concentrations observed.

TL;DR: In this article, a noncycling surface breeding (NCSB) is proposed to perturb the surface initial conditions (ICs) in a limited area model ensemble prediction system, which combines short-range surface forecasts driven by perturbed atmospheric forcing and the breeding method for generating the perturbation.

TL;DR: In this paper, a parametrization for area cloud fraction, compatible with a prognostic cloud scheme, is developed and tested and implemented in a general circulation model and used to produce a weather forecast and a climate simulation.

TL;DR: In this article, a hydrometeorological model SAFRAN-ISBA-MODCOU is forced by seasonal forecasts from the DEMETER project for the March-April-May period.

TL;DR: In this article, the authors compare post-1979 modeled and observed temperature trends in the tropical lower and mid-troposphere, and show that the observed trends are significant in some cases but tend to differ significantly from modeled trends.

TL;DR: In this article, the authors present the hydrological ensemble prediction system developed at the Royal Meteorological Institute (RMI) of Belgium to study the Meuse and Scheldt basins.