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Prądy strumieniowe jako przyczyna powstawania turbulencji bezchmurnego nieba nad Europą

100%

Bąkowski R.

tom Z. 3-4

187-194

This paper analysis the criteria used to determine the occurrence of clear air turbulences (CAT) as phenomena connected with the location of jet streams. Next, using data from aerological measurements taken in the decade 1992-2001 at 67 stations over Europe and its margins the zones of strong streams in upper and middle troposphere are determined. The next step includes determinations of the areas of similar characteristics of jet stream occurrence, as phenomena, which influence development of CAT zones.

A note on the potential impact of aviation emissions on jet stream propagation over the northern hemisphere

63%

Kossakowska M. , Kaminski J. W.

Acta Geophysica

2020

tom Vol. 68, no. 4

1187--1199

The goal of the study was to investigate if aviation emissions could infuence the climate and weather by modifying the chemical composition of the atmosphere and subsequently, the radiative balance. To carry out the set objective, we used the global environmental multiscale atmospheric chemistry model with comprehensive tropospheric and stratospheric chemistry that is interactive with the radiation calculations. The model was run for two current climate scenarios, with and without aviation emissions. The results of the study indicate that the most signifcant diference in the jet stream propagation occurred during the winter season, and the smallest was observed during summer. Changes in the jet stream propagation vary by season and region. During the colder time of the year, the eddy-driven jet stream tends to shift poleward, while during the spring season the equatorward shift was observed in a scenario with aviation emissions. Analysis of regional changes shows that the most noticeable diferences occurred over the Pacifc Ocean, Atlantic Ocean and Asia. The changes over the oceans changed the occurrence of the North Pacifc and Bermuda–Azores Highs. Over Asia (Siberia), a stronger and more poleward drift of the eddy-driven jet stream was observed in a scenario without aviation emission. Dissimilarity in the jet stream velocity was found only during the winter seasons when in a scenario with aviation emission, the jet stream velocity was 10 m/s smaller as compared to the scenario without aviation emission.