Abstract. Previous studies have indicated that, on a synoptic scale, severe haze in eastern China (EC) is affected by atmospheric circulation variations. However, it still unclear what the dominant patterns influencing winter conditions EC and differences between them are. To systematically determine of different regions EC, we use hierarchical clustering algorithm (HCA) to classify local geopo...

Abstract. The Madden–Julian Oscillation (MJO) is one of the main sources sub-seasonal atmospheric predictability in tropical region. MJO affects precipitation over highly populated areas, especially around southern India. Therefore, predicting its phase and intensity important as it has a high societal impact. Indices can be derived from first principal components zonal wind outgoing longwave r...

Previous studies indicated that surface wind speed over China declined during past decades, and several explanations exist in the literature. This study presents long-term (1960–2009) changes of both surface and upper-air wind speeds over China and addresses observed evidence to interpret these changes. It is found that surface wind over China underwent a three-phase change over the past 50 yr:...

Detailed analysis of the satellite derived water vapour for a five years period (1995-1999) prior to and during southwest monsoon is done over Indian subcontinent adjoining seas. Three layer (1000 hPa – 700 hPa, –500 500 -300 hPa) total moisture data available from NOAA/TOVS are used analysis. These study northward propagating intraseasonal oscillations in tropical Ocean summer season. Results ...

The geopotential height (GPH) product created from global observations by the High Resolution Dynamics Limb Sounder (HIRDLS) instrument on NASA’s Earth Observing System (EOS) Aura spacecraft is discussed. The accuracy, resolution and precision of the HIRDLS version 7 algorithms are assessed and data screening recommendations are made. Comparisons with GPH from observations, reanalyses and model...

abstractâ in this study, for spatial-temporal analyzing of cyclones in 1376, the spatial range of 30 to 80 degrees of east longitude and 0 to 80 degrees of north latitude and geo potential data with 2/ 5* 2 / 5 degrees of networking in arc levels of 1000, 925, 850, 700, 600 and 500 hpa have been used. these data are extracted for six hours (00, 06, 12, 18 zulu) database (ncep / ncar). so that, ...

Here, I create a dataset of fronts in mid- and high latitudes by applying an objective front detection method to the JRA-55 reanalysis try climate classification based on dynamic climatology from temperate polar regions. Additionally, describe interannual variations long-term trends frontal zone. The unique feature this study lies methods used for data creation. This includes addition geopotent...

Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion EGU Abstract We present a new statistical method to optimally link local weather extremes to large-scale atmospheric circulation structures. The method is illustrat...

Our confidence in future climate projection depends on the ability of models to simulate current climate, and model performance simulating atmospheric circulation affects its extreme events. In this study, self-organizing map (SOM) method is used evaluate frequency, persistence, transition characteristics Coupled Model Intercomparison Project Phase 6 (CMIP6) for different ensembles daily 500 hP...

[1] Changes in tropospheric water vapor over the Arctic are examined for the period 1979 to 2010 using humidity and temperature data from nine high latitude radiosonde stations north of 70 N with nearly complete records, and from six atmospheric reanalyses, emphasizing the three most modern efforts, MERRA, CFSR and ERA-Interim. Based on comparisons with the radiosonde profiles, the reanalyses a...