Employing reanalysis datasets, several threshold temperatures at 850 hPa are used tomeasure the wintertime [December–February (DJF)] areal extent of the lower-tropospheric, Northern Hemisphere, cold-air pool over the past 66 cold seasons. The analysis indicates a systematic contraction of the cold pool at each of the threshold temperatures. Special emphasis is placed on analysis of the trends i...

Atmospheric responses to sea ice retreat in the Bering Sea have been linked to recent extremewinters inNorthAmerica.We investigate the leading factor for the interannual variability of Bering sea ice area (SIA) in early winter (November–December), using canonical correlation analysis based on seasonally resolved atmosphere and ocean data for 1980–2014.We found that the 3-month leading (August–S...

the aim of this research is the assessment of the relation between rainfall and large scale synoptically patterns at khorasan razavi province. in this study, using adaptive neuro fuzzy inference system, the rainfall estimation has been done from april to june in the area under study. spring rainfall data including the information of 38 synoptic, climatologic and rain gauge stations from 1970 to...

We combine a machine learning method and ensemble climate predictions to investigate windows of opportunity for seasonal predictability European summer associated with the North Atlantic jet stream. particularly focus on impact spring sea surface temperatures (SST) four dominant atmospheric teleconnections stream: Oscillation (NAO) in positive negative phases, Ridge (At. Ridge), Low Low). go be...

Drought management in Sri Lanka is mostly limited to relief provision due the shortage of scientific details develop sufficient drought risk management. Therefore, spatio-temporal variability droughts two cropping seasons, Yala (May–August) and Maha (October–March) Lanka, have been investigated using Standardized Precipitation Evapotranspiration Index (SPEI). The SPEI-4 at August (SPEI-4August)...

[1] We report new observations of stationary planetary waves in the Southern Hemisphere of Mars by Mars Global Surveyor (MGS). We focus on a period during midwinter (Ls = 134 –160 ) when independent observations were acquired by two techniques. Radio occultation experiments sounded the atmosphere at essentially fixed latitude ( 68 S) and local time ( 1030), yielding profiles of geopotential and...

[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...

We analyzed summertime (June–August) cold-front activity via frequency and duration in the southeastern USA during 1973–2020 to summarize identify temporal trends of annual total number hours associated with cold fronts, days, multi-day events. Using data from 34 ASOS Network stations, we defined fronts as events that lowered dew point temperature below 15.56 °C (< 60 °F). Additionally, exam...