Showing papers in "Atmospheric Science Letters in 2009"

TL;DR: In this article, a high resolution daily gridded temperature data set for the Indian region was developed using temperature data of 395 quality controlled stations for the period 1969-2005, using a modified version of the Shepard's angular distance weighting algorithm was used for interpolating the station temperature data into 1° latitude × 1° longitude grids.

TL;DR: The results obtained from a conventional trend analysis of the Indian summer monsoon rainfall over a larger region are contradicted when analysis is performed at a finer resolution because of spatial variability and heterogeneity in the rainfall pattern as discussed by the authors.

TL;DR: The Saharan atmospheric boundary layer plays a significant role in the atmospheric global circulation and directly affects the vertical redistribution of dust originated in the Sahara, the world's largest dust source as mentioned in this paper.

TL;DR: In this article, the Bjerknes positive feedback (μ) and the heat flux negative feedback (α) were analyzed in 12 coupled GCMs and the authors found that the models generally underestimate both feedbacks, leading to an error compensation.

TL;DR: In this article, the authors applied the Mann-Kendall (MK) test and Bayesian model to systematically explore trends and abrupt changes of the precipitation series in the Pearl River basin.

TL;DR: In this article, a hybrid direct simulation tool is used specifically to quantify the turbulent enhancement of the gravitational collision-coalescence, and an impact study using the most realistic collection kernel suggests that cloud turbulence can significantly reduce the time for warm rain initiation.

TL;DR: In this article, a regional climate model is used to investigate changes in Israel and Jordan precipitation at the end of the 21st century on daily to monthly timescales, and it predicts that this region will get significantly drier at the peak of the rainy season, reflecting a reduction in both the frequency and duration of rainy events.

TL;DR: In this article, uncertainties in changes to the spatial distribution and magnitude of daily monsoon rainfall over India are assessed in the doubled CO2 climate change scenarios in the IPCC Fourth Assessment Report.

TL;DR: The neighbor enclosed area tracking (NEAT) algorithm is proposed as an alternative method to conventional point-to-point cyclone tracking approaches as discussed by the authors, which enables us to count the genesis and tracks of individual cyclones as well as the number of merged and separated cyclones.

TL;DR: In this paper, a new model, BAMBO, was developed in order to investigate the reaction between peroxy radicals (RO2 )a nd the hydroxyl radical (OH) under typical marine boundary layer (MBL) conditions.

TL;DR: In this article, a method is proposed to score models from the 1961-1990 monthly precipitation cumulative density functions (CDFs) for each season and eight chosen subregions, compared with the CRU observational database.

TL;DR: In this paper, future changes in the circulation of the troposphere might change the delivery of short-lived brominated species to the stratosphere and study the impact of this change on stratospheric ozone.

TL;DR: In this paper, the authors provided an account of the black carbon (BC) aerosol mass concentration variation in contrasting environments of India corresponding to the urban and rural areas of Hyderabad and Anantapur during August 2006.

TL;DR: In this paper, a portable micro pulse lidar (MPL) system was installed in the year 2006 at Manora Peak, (29°22′N, 79°27′E, ∼1960 m amsl) Nainital, a high altitude location in the central Himalayas.

TL;DR: In this article, the authors present laboratory measurements of the dependence of the uptake coefficient γ on temperature for removal of the NOx reservoir N2O5 by sub-micron aerosols containing ammonium sulfate and ammonium hydrogen sulfate.

TL;DR: In this paper, three-dimensional simulations of tornado-like vortices are presented from a numerical model of the incompressible Navier-Stokes equations with a Reynolds number, based on scales of the entire recirculating updraft, of up to 4.0 × 104.

TL;DR: In this paper, it was shown that there is a huge repository of ice nuclei in lichens which comprise a large biomass and are able to become airborne, which suggests that eukaryotic IN may be more important to atmospheric processes than previously thought.

TL;DR: In this article, an aerodynamic gradient and eddy covariance (EDC) method was used to estimate surface losses and ozone uptake by plants over grassland in southern Scotland during August 2007.

TL;DR: In this article, four perfluorocarbon tracer dispersion experiments were carried out in central London, United Kingdom in 2004, which were supplementary to the dispersion of air pollution and penetration into the local environment.

TL;DR: In this paper, the 3B42_V6 algorithm was evaluated for the region of the Tropical Rainfall Measurement Mission and Large Scale Biosphere-Atmosphere Experiment in Amazonia (TRMM-LBA) experiment, which was conducted in the Amazon Basin during the 1999 rainy season.

TL;DR: The relationship between the ENSO condition and the winter condition in Hong Kong is investigated in this paper, which showed that Hong Kong tends to be warmer with a shorter duration for the longest cold spell during the winter without blocking event over the Eurasian continent.

TL;DR: In this paper, the S-band radar was evaluated with rain gauges network measurements during the Tropical Rainfall Measuring Mission and Large-Scale Biosphere-Atmosphere Experiment in Amazonia (TRMM-LBA), then the daily variability associated with the presence (absence) of the South Atlantic convergence zone (SACZ) were studied.

TL;DR: In this article, an idealisation of these increases in polar stratospheric cloud (PSC) within the radiation scheme of an atmosphere-only general circulation model was proposed to demonstrate the need to improve the representation of PSCs.

TL;DR: In this paper, a parameter estimation problem in context of ensemble data assimilation is addressed, where the parameters corresponding to the emissivity and to the effective depth between the surface and the lowest atmospheric model level are estimated together with the initial conditions for temperature.

TL;DR: In this paper, an analysis of long-term time series of monthly mean aerosol optical depths (AOD) at four tropical stations over Asia and Africa revealed the presence of significant annual oscillations (AO) and quasi-biennial oscillations(QBO) in AOD.

TL;DR: The mixing ratios of 11 C1-C3 halocarbons have been measured using a GC-twin-linked ECD system over the period from October 2004 to December 2005 at an urban site in Bristol, UK as discussed by the authors.

TL;DR: In this article, an exploratory study is performed on the 850-hPa relative humidity data (RH850) extracted from the Re-Analysis Project (ERA-40) and National Centers for Environmental Prediction (NCEP)/National Center for Atmospheric Research (NCAR) re-analyses covering a domain centred on western Europe (60°W −60°E, 15°N −75°N).

TL;DR: In this paper, a Lagrangian particle method is developed for the simulation of atmospheric flows in a non-hydrostatic vertical slice model, which provides preservation of mass, momentum, and energy.

TL;DR: In this article, a method of examining observed rainfall patterns and processes under different conditions of synoptic meteorology and local topography is presented, which can be used to test regional climate models (RCMs) outputs so that model parameterisation can be improved.

TL;DR: In this article, the performance of a suite of microphysics schemes of varying levels of complexity can be compared within an idealised framework, and the importance of microphysical complexity on precipitation and cloud albedo relative to the effects of meteorology is quantified.