Characteristics of high-altitude jet streams during anomalous - - PowerPoint PPT Presentation

Characteristics of high-altitude jet streams during anomalous weather conditions in the Northern Hemisphere, using the example of July 2018

Evgeniya Durneva

A.M. Obukhov Institute of Atmospheric Physics, Moscow Arctic and Antarctic Research Institute, St. Petersburg

Weather anomalies on July 2018

• The reason of temperature anomalies in the north

part of Europe – anticyclone (blocking) growing

• ver the Barents Sea at the beginning of July.

Mean monthly field of temperature and sea level pressure, July 2018

• Blocking has formed due to the influence of the jet

stream in the polar region and mid-latitude.

Jet stream - relatively narrow bands of strong wind (more then 30 m/s) in the upper levels of the atmosphere.

At the period of climate changes, particularly warming in the Arctic Temperature gradient between polar regions and equator is decreasing

Characteristics of high-altitude jet streams during climate changes

• The position of the polar jet stream relative to the North Pole
• Intensity
• High amplitude

Mean monthly geopotential field 400 hPa, July 2018 Geopotential field 400 hPa and jet stream,

• n 10 July

Geopotential field 400 hPa and jet stream, on 28 July Geopotential field 300 hPa and jet stream,

• n 28 July