Co-author(s) :

Gevorgyan Artur ; Sargsyan Sona ; Sahakyan Vladimir ; Petrosyan Zarmandukht ; Panyan Hasmik ; Abrahamyan Rita ; Astsatryan Hrachya ; Shoukorian Yuri

Abstract:

The number of extreme weather events including strong frosts, cold waves, heat waves, droughts, hails, strong winds has increased in Armenia by 20% during the last 20 years. The paper studies the formation of cold-air pools in Ararat Valley, Armenia during the winter season. Observational data from 47 meteorological stations of Armenia were used, and daily minimum temperatures lower than -10 0C were assessed over the period 1966-2017. December, 2016 was considered as the 4-th coldest month, after the years 2013, 2002 and 1973. The focus area of this study is the low-elevated basin of Ararat Valley for which climatological analysis of winter temperature regime has been performed. Monthly average temperatures for December were significantly below normal values, particularly, for low-elevated part of Ararat Valley. 24-hour simulations derived from Weather Research and Forecasting model (WRF) were used to assess the WRF model’s capabilities to reproduce strong cold-air pool (CAP) over the Ararat Valley observed on 20 December 2016 when minimum temperatures decreased up to -20 0C and lower. The WRF model was applied with spatial resolutions of 9 and 3 km and 65 vertical levels based on Global Forecast System model’s (GFS) initial and boundary conditions at 0.25x0.25 deg. resolution.

Identifier:

oai:noad.sci.am:135808

Language:

English

URL:

Additional Information:

hamlet_melkonyan@yahoo.com ; agm86@yandex.ru ; rita_60@mail.ru ; s.sargsyan73@mail.ru ; edittaron@gmail.com ; hasmik1292@gmail.com ; hrach@sci.am ; svlad@sci.am ; shouk@sci.am

Affiliation:

Service of Hydrometeorology and Active Influence on Atmospheric Phenomena ; Institute for Informatics and Automation Problems

Country:

Armenia

Year:

2017

Time period:

September25-29

Conference title:

11th International Conference on Computer Science and Information Technologies CSIT 2017

Place:

Yerevan

Participation type:

oral