Recent variations of cloudiness over Russia from surface daytime observations

Changes of total and low cloud fraction and the occurrence of different cloud types over Russia were assessed. The analysis was based on visual observations from more than 1600 meteorological stations. Differences between the 2001–10 and 1991–2000 year ranges were evaluated. In general, cloud fraction has tended to increase during recent years. A major increase of total cloud fraction and a decrease of the number of days without clouds are revealed in spring and autumn mostly due to an increase of the occurrence of convective and non-precipitating stratiform clouds. In contrast, the occurrence of nimbostratus clouds has tended to decrease. In general, the ratio between the occurrence of cumulonimbus and nimbostratus clouds has increased for the period 2001–10 relative to 1991–2000. Over particular regions, a decrease of total cloud fraction and an increase of the number of days without clouds are noted.

[1]  William B. Rossow,et al.  Radiative Effects of Cloud-Type Variations , 2000 .

[2]  J. Dufresne,et al.  Variations in the characteristics of cyclonic activity and cloudiness in the atmosphere of extratropical latitudes of the Northern Hemisphere based from model calculations compared with the data of the reanalysis and satellite data , 2009 .

[3]  J. Norris,et al.  Interannual and Interdecadal Variability in the Storm Track, Cloudiness, and Sea Surface Temperature over the Summertime North Pacific , 2000 .

[4]  I. Mokhov,et al.  Interannual Variability and Long-Term Tendencies of Change in Atmospheric Centers of Action in the Northern Hemisphere: Analyses of Observational Data , 2005 .

[5]  B. Barkstrom,et al.  Cloud-Radiative Forcing and Climate: Results from the Earth Radiation Budget Experiment , 1989, Science.

[6]  P. Groisman,et al.  Cloudiness variations over the former Soviet Union , 2000 .

[7]  D. Kaiser,et al.  Six- and three-hourly meteorological observations from 223 USSR stations , 1995 .

[8]  Stephen G. Warren,et al.  The effect of moonlight on observation of cloud cover at night, and application to cloud climatology , 1995 .

[9]  Kevin E. Trenberth,et al.  Recent Trends in Cloudiness over the United States: A Tale of Monitoring Inadequacies. , 2006 .

[10]  Stephen G. Warren,et al.  A GRIDDED CLIMATOLOGY OF CLOUDS OVER LAND (1971-96) AND OCEAN (1954-97) FROM SURFACE OBSERVATIONS WORLDWIDE , 2007 .

[11]  Stephen G. Warren,et al.  A Survey of Changes in Cloud Cover and Cloud Types over Land from Surface Observations, 1971–96 , 2007 .

[12]  David R. Easterling,et al.  Changes in the Probability of Heavy Precipitation: Important Indicators of Climatic Change , 1999 .

[13]  V. Ramanathan,et al.  Relationships between Large-Scale Vertical Velocity, Static Stability, and Cloud Radiative Forcing over Northern Hemisphere Extratropical Oceans* , 1997 .

[14]  J. Norris.  Multidecadal Changes in Near-Global Cloud Cover and Estimated Cloud Cover Radiative Forcing , 2005 .

[15]  Igor I. Mokhov,et al.  Regional model assessments of forest fire risks in the Asian part of Russia under climate change , 2010 .

[16]  I. Mokhov,et al.  Regional model assessments of fire risks under global climate changes , 2006 .

[17]  D. Randall,et al.  Mission to planet Earth: Role of clouds and radiation in climate , 1995 .

[18]  J. Norris,et al.  North Pacific Cloud Feedbacks Inferred from Synoptic-Scale Dynamic and Thermodynamic Relationships , 2005 .

[19]  I. Sall,et al.  Peculiarities of climatic changes in cloud cover over the Russian Federation , 2009 .

[20]  Vincent R. Gray.  Climate Change 2007: The Physical Science Basis Summary for Policymakers , 2007 .

[21]  I. Mokhov,et al.  Tropospheric lapse rate and its relation to surface temperature from reanalysis data , 2006 .

[22]  I. Mokhov,et al.  Recent Changes in Cloud-Type Frequency and Inferred Increases in Convection over the United States and the Former USSR , 2001 .