air pollution is one of the most important problems in urban areas that always threaten citizen's health. photochemical smog is one of the main factors of air pollution in large cities like tehran. usually smog is not only a part of nature, but is being analyzed as an independent matter, which highly affects on the nature. it has been used as relationship between atmospheric elements such as te...

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...

extended abstractintroduction the recognition of behaviors of the atmospheric circulation patterns and effective climatic elements in occurrence of flood is very important, especially because abnormal climate changes such as global warming in recent years tend to change in atmospheric circulation patterns and outbreak climatic inelegances in many areas in the world. intensive and torrential pre...

introduction temperature effects on human activities and natural processes are undeniable. temperature increase, in particular, in the form of heat waves affects all facets of life including architecture, welfare, transport, agriculture and industry. when the intensity and frequency of the waves are high, they can produce major problems. in recent years, the number and intensity of these heat w...

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 air fluorescence technique is used to detect ultra-high energy cosmic rays (UHECR), and to estimate their energy. Of fundamental importance is the photon yield due to excitation by electrons, in air of various densities and temperatures. After our previous report, the experiment has been continued using a 90Sr β source to study the pressure dependence of photon yields for radiation in nitro...

[1] The Madden-Julian Oscillation (MJO) is the primary mode of large-scale intraseasonal variability in the tropics. Recent work has connected the MJO to atmospheric variability in mid-latitudes. We focus on relationships between the MJO and wintertime surface air temperatures in the Northern Hemisphere high latitudes. The MJO is diagnosed using principal EOF of 850 hPa zonal winds from the NCE...

Aluminide coatings have been studied for many years because of their excellent corrosion resistance in oxidizing, sulfidizing and carburizing environments. One of the factors that inhibits their application is a lack of sufficient data about their potential benefits. In order to address this issue, model coatings are being fabricated using a chemical vapor deposition (CVD process on ferritic (F...

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 ...

Ahvaz can be regarded as one of the most polluted cities in the world in terms of air pollution. Successive years of drought and weather conditions in recent years have resulted in particulate matter (PM10) concentration in Ahvaz. In this study, using probability distribution techniques, an appropriate threshold to identify the PM10 maximum extreme concentrations (MEC) has been detected. Based ...