Variability and trends in record air temperature events of Turkey and their associations with atmospheric oscillations and anomalous circulation patterns

2018 ◽  
Vol 38 (14) ◽  
pp. 5182-5204 ◽  
Author(s):  
Murat Türkeş ◽  
Ecmel Erlat
Keyword(s):  
Air Temperature ◽  
Circulation Patterns ◽  
Anomalous Circulation

scholarly journals Relationships of surface air temperature anomalies over Europe to persistence of atmospheric circulation patterns conducive to heat waves

2008 ◽  
Vol 14 ◽  
pp. 243-249 ◽  
Author(s):  
J. Kyselý ◽  
R. Huth
Keyword(s):  
Atmospheric Circulation ◽  
Air Temperature ◽  
Heat Waves ◽  
Temperature Extremes ◽  
Human Society ◽  
Positive Temperature ◽  
Temperature Anomalies ◽  
Circulation Types ◽  
Circulation Patterns ◽  
Air Temperature Anomalies

Abstract. Heat waves are among natural hazards with the most severe consequences for human society, including pronounced mortality impacts in mid-latitudes. Recent studies have hypothesized that the enhanced persistence of atmospheric circulation may affect surface climatic extremes, mainly the frequency and severity of heat waves. In this paper we examine relationships between the persistence of the Hess-Brezowsky circulation types conducive to summer heat waves and air temperature anomalies at stations over most of the European continent. We also evaluate differences between temperature anomalies during late and early stages of warm circulation types in all seasons. Results show that more persistent circulation patterns tend to enhance the severity of heat waves and support more pronounced temperature anomalies. Recent sharply rising trends in positive temperature extremes over Europe may be related to the greater persistence of the circulation types, and if similar changes towards enhanced persistence affect other mid-latitudinal regions, analogous consequences and implications for temperature extremes may be expected.

scholarly journals Glacier-climate interaction at low latitudes

2001 ◽  
Vol 47 (157) ◽  
pp. 195-204 ◽  
Author(s):  
Georg Kaser
Keyword(s):  
Air Temperature ◽  
Specific Mass ◽  
Irian Jaya ◽  
Global Circulation ◽  
Field Evidence ◽  
Circulation Patterns ◽  
Tropical Conditions ◽  
Low Latitudes ◽  
Seasonal Oscillation ◽  
Dry Seasons

AbstractIn the low latitudes there is an absence of major thermal seasonality, yet there are three different climate regimes related to global circulation patterns and their seasonal oscillation: the humid inner tropics, the dry subtropics and, intermediate between these two, the outer tropics. For the respective glacier regimes the vertical profiles of specific mass balance (VBPs) are modeled considering vertical gradients of accumulation, air temperature and albedo, the duration of the ablation period and a factor for the ratio between melting and sublimation. The model is first calibrated with data from Hintereisferner, Austrian Alps, and is then applied to tropical conditions. The simulated VBP matches well the measured profiles from Irian jaya and Mount Kenya. Due to lack of field evidence, the subtropical VBP cannot be verified directly. However, application of the respective model versions separately to the humid and dry seasons of the outer-tropical Glaciar Uruashraju, Cordillera Blanca, Peru, provides reasonable results. Glaciers in the humid inner tropics are considered to be most sensitive to variations in air temperature, while dry subtropical glaciers are most sensitive to changes in air humidity. The two seasons of the outer tropics have to be viewed from these different perspectives.

scholarly journals Seasonal probability forecasts of december-january-february precipitation in northern Uruguay and Rio Grande do Sul obtained with the coupled forecast system v2 of NOAA and statistical downscaling

2012 ◽  
Vol 27 (4) ◽  
pp. 377-387 ◽  
Author(s):  
Gabriel Cazes Boezio ◽  
Stefanie Talento ◽  
Gabriel Jorge Pisciottano Jalabert
Keyword(s):  
South America ◽  
Numerical Models ◽  
Austral Summer ◽  
Rio Grande ◽  
Meridional Wind ◽  
Rio Grande Do Sul ◽  
Forecast System ◽  
Seasonal Predictability ◽  
Circulation Patterns ◽  
Anomalous Circulation

The present work analyses the inter-seasonal predictability of precipitation during the austral summer in a subregion of Southeastern South America that includes Rio Grande do Sul and Northern Uruguay (RGS-NU), and proposes a methodology to produce probabilistic precipitation forecasts for this region, based on the use of NOAA CFS v2. It is found that the correlation between ENSO and the precipitation over RGS-NU during December-January-February is statistically significant after the late 70's, but not before. Considering that this relationship changes in different multidecadal periods, it is useful to explore a forecast system based on numerical models. We studied the hindcasts from NOAA CFS v2 initialized during October of the years 1983 to 2009, and found that the hindcasts of meridional wind at 850 hPa averaged over certain region of South America have statistically significant skill, in terms of correlation, to predict the observed precipitation over RGS-NU. The proposed forecasts are based on this relationship. The CFS v2 hindcasts also show realistic anomalous circulation patterns associated with the anomalous precipitation in the region and the season considered. This suggests that the forecasts may be further improved by using regional models combined with the CFS v2 outputs.

scholarly journals Simulation of daily variation of precipitation during anomalously-wet dry season event over the western Maritime Continent

2021 ◽  
Vol 893 (1) ◽  
pp. 012046
Author(s):  
E Yulihastin ◽  
Suaydhi ◽  
H Satyawardhana ◽  
C N Ihsan
Keyword(s):  
Climate Model ◽  
Regional Climate ◽  
Tropical Rainfall Measuring Mission ◽  
Satellite Observation ◽  
Atmospheric Model ◽  
Dry Season ◽  
Maritime Continent ◽  
Local Circulation ◽  
Circulation Patterns ◽  
Anomalous Circulation

Abstract Local seas play a significant role in causing anomalously wet of the dry season over the Indonesia Maritime Continent (10°S-8°N, 95-145°E). As a result, modeling the anomalously-wet dry season over Indonesia lead challenges due to several subregional processes over local seas could not be captured well in the regional climate model. This study explores subregions processes of sea-air interaction over the western Maritime Continent by simulating diurnal precipitation using Cubic Conformal Atmospheric Model (CCAM) with a spatial resolution of 32 km during the anomalously-wet dry season periods during May-to-September (MJJAS) 2020. The simulated results were confirmed by precipitation data from Tropical Rainfall Measuring Mission (TRMM) satellite observation. The results show anomalous circulation patterns induce anomalous regional precipitation over western MC is induced by anomalous circulation patterns over four keys of seas subregion, i.e., Indian Ocean, South China Sea, southern Sumatra (Lampung and Sunda strait), and the Java Sea. Furthermore, the anomalous circulation also modulates anomalous local circulation and enhances surface water vapor by an increased surface latent heat flux.

scholarly journals Upper troposphere circulation anomalies over Asia-Pacific region associated with the interannual variation of Indian summer monsoon

MAUSAM ◽  
2021 ◽  
Vol 49 (4) ◽  
pp. 461-468
Author(s):  
D. S. PAI ◽  
M. RAJEEVAN ◽  
U. S. DE
Keyword(s):  
Monsoon Season ◽  
Cyclonic Circulation ◽  
Asia Pacific ◽  
Asia Pacific Region ◽  
Circulation Anomaly ◽  
Upper Troposphere ◽  
Circulation Patterns ◽  
Anomalous Circulation ◽  
Mean Vector ◽  
Vector Wind

Monthly mean vector wind and geopotential heights at 200 hPa of 67 radiosonde stations from Asia Pacific regions for the period 1963-1988 are used to examine the composite circulation anomaly patterns for the month of May and the monsoon season (June- September) with respect to good monsoon years and bad monsoon years (both associated with ENSO and not associated with ENSO). There are significant differences in the anomalous circulation features between good and bad monsoon years. During the month of May an anomalous anticyclonic (cyclonic) circulation over-central Asia and an anomalous cyclonic (anticyclonic) circulation over Pacific ocean were observed during good (bad) monsoon years. These anomalies persist in the subsequent monsoon season. The key mechanisms of the development of these anomalous circulation  patterns and their consequences are discussed.

scholarly journals Surface air temperature variability over the Arabian Peninsula and its links to circulation patterns

2018 ◽  
Vol 39 (1) ◽  
pp. 445-464 ◽  
Author(s):  
Raju Attada ◽  
Hari Prasad Dasari ◽  
Jasti S. Chowdary ◽  
Ramesh Kumar Yadav ◽  
Omar Knio ◽  
...  
Keyword(s):  
Air Temperature ◽  
Arabian Peninsula ◽  
Surface Air Temperature ◽  
Temperature Variability ◽  
Circulation Patterns
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