abstract drastic precipitations in unmorally times always are one of the important factors that created abundant damages in different geographical areas. in this research, three precipitations that occurred in summer 2009 in mashhad were investigated. the investigation of variation graphs of meteorological parameters show significant decreasing of air pressure and temperature and increasing of ...

Cold air drainage and pooling occur in many mountain valleys, especially at night and during winter. Local climate regimes associated with frequent cold air pooling have substantial impacts on species phenology, distribution and diversity. However, little is known about how the degree and frequency of cold air drainage and pooling will respond to a changing climate. Evidence suggests that, beca...

This study investigates the long-term tendency in ratio of rapid intensification (RI) cases to total number tropical cyclone over western North Pacific (WNP) during June between 1982 and 2021. There is a significant decreasing trend RI June, which opposite increasing July–November. From 1982–2005 2006–2021, significantly decreases region 5°–20°N 120°–150°N, while showing weak changes other part...

Based on the atmospheric temperature and dew point difference series of mandatory levels in arid region northwest China, we calculated specific humidity stations at 200, 300, 400, 500, 700, 850 hPa analyzed spatial temporal distribution. The radiosonde is compared with two sets reanalysis data (ERA-interim from European Centre for Medium Range Weather Forecasts Modern Era Retrospective Analysis...

The 2013/14 boreal winter (December 2013–February 2014) brought extended periods of anomalously cold weather to central and eastern North America. The authors show that a leading pattern of extratropical variability, whose sea level pressure footprint is the North Pacific Oscillation (NPO) and circulation footprint the West Pacific (WP) teleconnection—together, the NPO–WP—exhibited extreme and ...

Abstract. The co-polluted days by ozone (O3) and PM2.5 (particulate matter with an aerodynamic equivalent diameter of 2.5 µm or less) (O3–PM2.5PDs) were frequently observed in the Beijing–Tianjin–Hebei (BTH) region warm seasons (April–October) 2013–2020. We applied 3-D global chemical transport model (GEOS-Chem) to investigate physical characteristics O3–PM2.5PDs composited analyses such that c...

Tropical cyclone is affected mainly by steering flow, Rossby drift and surface frictional effects. There are many models to predict the storm track. In this paper two thermodynamic parameters SWEAT and ACE are analyzed to observe the variation of these two parameters along the track of two cyclonic storms MALA and BIJLI over the Bay of Bengal. Peak ACE is found on the third day of the cyclonic ...

[1] A 42-year collection of 12h balloon soundings from six sites surrounding Greenland reveal distinct patterns of tropospheric and stratospheric temperature variability. Seasonal mean upper-air temperatures exhibit statistically significant correlations with surface air temperature records. Over the full 1964–2005 record, patterns of statistically significant tropospheric warming and stratosph...

A physics-based statistical stochastic system is developed for estimating the long-term hazard of rare, high impact landfall events globally from ensembles of synthetic tropical cyclones. There are three components representing the complete storm lifetime: an index-based genesis model, a beta-advection track model and an autoregressive intensity model. All three components depend upon the local...

Abstract In this study, global reanalysis dataset fields of meteorological parameters (temperature and geopotential height at different atmospheric levels) in the period 1948–2020, were used to characterize main dynamic thermodynamic features African dust outbreaks (ADO) produced over regions Iberian Peninsula Balearic Islands. The record ADO previously identified with a tried-and-true procedur...