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NCAR Climate Data Guide Content with Tag: Diagnostic Data Sets

Atmospheric Reanalysis: Overview & Comparison Tables
Reanalysis a systematic approach to produce data sets for climate monitoring and research. Reanalyses are created via an unchanging ("frozen") data assimilation scheme and model(s) which ingest all available observations every 6-12 hours over the period being analyzed. This unchanging framework...
Main variables and Earth System components:
See Expert Guidance by Dee, Dick | See Expert Guidance by Fasullo, John | See Expert Guidance by Shea, Dennis | See Expert Guidance by Walsh, John
CERES EBAF: Clouds and Earth's Radiant Energy Systems (CERES) Energy Balanced and Filled (EBAF)
Years of Record: 2000/02 to 2017/01
The CERES-EBAF product provides 1-degree regional, zonal and global monthly mean Top-of-Atmosphere (TOA) and surface (SFC) longwave (LW), shortwave (SW), and net (NET) fluxes under clear and all-sky conditions. EBAF is used for climate model evaluation, estimating the Earth's global mean...
Main variables and Earth System components:
Formats: netCDF Timestep: Monthly Domain: Global
See Expert Guidance by Loeb, Norman
Cloud observations from MODIS
Years of Record: 2000/02 to 2018/04
The Moderate Resolution Imaging Spectroradiometer (MODIS) is scanning instrument that makes measurements in 36 spectral bands from the visible to the thermal infrared at spatial resolutions from 250 m to 1 km. There are MODIS instruments aboard two sun-synchronous polar-orbiting NASA satellites:...
Main variables and Earth System components:
Formats: netCDF | HDF-EOS Timestep: Daily,Monthly,Weekly Domain: Global
See Expert Guidance by Pincus, Robert
January mean precipitation in CMAP (contributed by P Arkin)
CMAP: CPC Merged Analysis of Precipitation
Years of Record: 1978/12 to 2020/02
CMAP refers to a collection of precipitation data sets, though the 2.5°x2.5° global monthly version is probably the most widely used. This data set is constructed from an analysis of gauge data and satellite-derived precipitation estimates. An "enhanced" version (CMAP/A) is also available, which...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Monthly,Pentad Domain: Global
See Expert Guidance by Arkin, Phil | See Expert Guidance by Xie, PIngping
Combined CloudSat spaceborne radar and CALIPSO spaceborne lidar cloud fraction dataset
Years of Record: 2006/06 to 2011/01
A global (82S-82N) cloud fraction data set, providing a unique view of cloud vertical structure, has been developed based on the complimentary spaceborne remote sensing capabilities of the CloudSat radar and the CALISPSO lidar. The data set provides monthly mean cloud fraction over several vertical...
Main variables and Earth System components:
Formats: netCDF Timestep: Monthly,Seasonal,Annual Domain: Global
See Expert Guidance by Kay, Jennifer
COREv2 Air-Sea Surface Fluxes
Years of Record: 1948/12 to 2006/11
The Coordinated Ocean Research Experiments version 2  (COREv2) data set consists of a globally complete set of air-sea fluxes of momentum, heat and freshwater for 1948-2009 at monthly resolution.  This data set serves as a set of common atmospheric boundary conditions that has been used...
Main variables and Earth System components:
Formats: netCDF Timestep: Monthly Domain: Global
See Expert Guidance by Yeager, Stephen
COSP: Cloud Feedback Model Intercomparison Project (CFMIP) Observation Simulator Package
Cloud processes and feedbacks are recognized as the largest uncertainty in climate model projections of climate change. Progress in understanding the roles of clouds in climate change has in part been hampered by the lack of a consistent definition of clouds and cloud types in models and...
Main variables and Earth System components:
Domain: Global
See Expert Guidance by Kay, Jennifer
Earth Radiation Budget Experiment (ERBE): 1985-89
Years of Record: 1984/12 to 1989/11
The Goddard Space Flight Center built the Earth Radiation Budget Satellite (ERBS) on which the first ERBE instruments were launched by the Space Shuttle Challenger in 1984. ERBE instruments were also launched on two National Oceanic and Atmospheric Administration weather monitoring satellites, NOAA...
Main variables and Earth System components:
Formats: netCDF Timestep: Monthly Domain: Global
ERA-15
Years of Record: 1978/12 to 1993/11
The ERA-15 production system generated re-analyses for 15 years (1979-1993)  using a special version of their 1995 operational data assimilation system and model. The resulting analyses include full model resolution analyses or  reduced resolution analyses and climate and statistics data...
Main variables and Earth System components:
Formats: GRIB Timestep: Sub-daily,Monthly Domain: Global
See Expert Guidance by Shea, Dennis
SLP anomaly in DJF 1925-26 in ERA-20C
ERA-20C: ECMWF's atmospheric reanalysis of the 20th century (and comparisons with NOAA's 20CR)
Years of Record: 1899/12 to 2010/12
The ECMWF's first atmospheric reanalysis of the 20th Century, ERA-20C, provides a long, gridded dataset of many climate variables, spanning 1900-2010.  Observations assimilated include surface pressures from the International Surface Pressure Databank v3.2.6 and ICOADS v 2.5.1, and surface...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Daily,Monthly Domain: Global
See Expert Guidance by Poli, Paul
Climate Data Guide Image: ERA-Interim
ERA-Interim
Years of Record: 1978/12 to 2019/08
Using a much improved atmospheric model and assimilation system from those used in ERA-40, ERA-Interim represents a third generation reanalysis. Several of the inaccuracies exhibited by ERA-40 such as too-strong precipitation over oceans from the early 1990's onwards and a too-strong Brewer-Dobson...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Daily,Monthly Domain: Global
See Expert Guidance by Dee, Dick
ERA40
Years of Record: 1957/08 to 2002/07
ERA 40 is a second generation reanalysis. It is the first reanalysis to directly assimilate satellite radiance data (TOVS, SSM/I, ERS and ATOVS). Cloud Motion Winds are also used. The result is better circulation over the tropics and southern hemisphere. However, unless comparing  to previous...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Monthly Domain: Global
Representation of hurricane Florence(contributed by D Dee)
ERA5 atmospheric reanalysis
Years of Record: 1978/12 to 2020/10
ERA5, the successor to ERA-Interim,  provides global, hourly estimates of atmospheric variables, at a horizontal resolution of 31 km and 137 vertical levels from the surface to 0.01 hPa. Produced by ECMWF, ERA5 presently extends back to 1979; it will ultimately be extended back to 1950. ERA5...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Daily,Monthly Domain: Global
See Expert Guidance by Dee, Dick
FLUXNET
"FLUXNET is a global network of micrometeorological flux measurement sites that measure the exchanges of carbon dioxide, water vapor, and energy between the biosphere and atmosphere. At present over 140 sites are operating on a long-term and continuous basis. Vegetation under study includes...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Sub-daily Domain: Global
FLUXNET: MTE (Multi-Tree Ensemble)
Years of Record: 1981/12 to 2007/11
Global, spatially and temporally explicit estimates of carbon and water fluxes derived from empirical up-scaling eddy covariance measurements would constitute a new and possibly powerful data stream to study the variability of the global terrestrial carbon and water cycle. Jung et al (2009)
Main variables and Earth System components:
Formats: binary Timestep: Monthly Domain: Global
Global (land) precipitation and temperature: Willmott & Matsuura, University of Delaware
Years of Record: 1899/12 to 2014/11
A series of gridded temperature and precipitation data sets. Station records that served as bases for the Terrestrial Air Temperature: 1900-2014 Gridded Monthly Time Series (Version 4.01) and Terrestrial Precipitation: 1900-2014 Gridded Monthly Time Series (Version 4.01) archives are used here to...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Climatology,Monthly Domain: Global
See Expert Guidance by Matsuura, Kenji
HadCRUT4 and HadCRUT5 temperature anomalies (from CarbonBrief, https://www.carbonbrief.org/analysis-why-the-new-met-office-temperature-record-shows-faster-warming-since-1970s)
Global land-ocean surface temperature data: HadCRUT5
Years of Record: 1849/12 to 2020/11
HadCRUT5 is one of the main datasets used to monitor global and regional surface temperature variability and trends. It is a global surface temperature product that combines land surface air temperatures from CRUTEM5 with SSTs from HadSST4. HadCRUT5 is a departure from its predecessors (HadCRUT4,...
Main variables and Earth System components:
Formats: netCDF Timestep: Monthly Domain: Global
See Expert Guidance by Hausfather, Zeke
The mean global annual surface temperature from 1880-2019 with 95% confidence interval.
Global surface temperature data: GISTEMP: NASA Goddard Institute for Space Studies (GISS) Surface Temperature Analysis
Years of Record: 1879/12 to 2020/02
NASA Goddard's Global Surface Temperature Analysis (GISTEMP) combines land surface air temperatures primarily from the GHCN-M version 4 with SSTs of the ERSSTv5 analysis into a comprehensive global surface temperature data set spanning 1880 to the present at monthly resolution, on a 2x2 degree...
Main variables and Earth System components:
Formats: netCDF | ascii | binary Timestep: Monthly Domain: Global
See Expert Guidance by Lenssen, Nathan
Change of temperature between 1901:1920 and 1991:2010 based on the HadCRUT4 dataset. Credit: ClimateDataGuide, NCAR
Global surface temperature data: HadCRUT4 and CRUTEM4
Years of Record: 1849/12 to 2020/01
Extending back to 1850 and frequently updated, HadCRUT4 is the longest data set of its type. HadCRUT4 is a combination of the global land surface temperature data set, CRUTEM4 and the global SST data set, HadSST3. HadCRUT4 is different from the most closely comparable products (e.g. NASA GISTEMP...
Main variables and Earth System components:
Formats: netCDF | ascii | KML Timestep: Climatology,Monthly Domain: Global
Change of temperature in the MLOST data set.
Global surface temperature data: MLOST: NOAA Merged Land-Ocean Surface Temperature Analysis
Years of Record: 1870/12 to 2020/09
NOAA's Merged Land-Ocean Surface Temperature Analysis (MLOST) combines land surface air temperatures primarily from the Global Historical Climatology Network, Monthly (GHCN-M) version 3 with SSTs of the ERSSTv3b analysis into a comprehensive global surface temperature data set spanning 1880 to the...
Main variables and Earth System components:
Formats: netCDF | binary Timestep: Monthly Domain: Global
Change of temperature in the Berkeley Earth data Set.
Global surface temperatures: BEST: Berkeley Earth Surface Temperatures
Years of Record: 1700/12 to 2019/06
The Berkeley Earth Surface Temperatures (BEST) are a set of data products, originally a gridded reconstruction of land surface air temperature records spanning 1701-present, and now including an 1850-present merged land-ocean data set that combines the land analysis with an interpolated...
Formats: netCDF Timestep: Climatology,Daily,Monthly Domain: Global
See Expert Guidance by Cowtan, Kevin
Goddard Satellite-based Surface Turbulent Fluxes Version 2c (GSSTF 2c)
Years of Record: 1986/12 to 2008/11
This data set (GSSTF 2C) has been superceded by GSSTF3 released in July 2012. The Goddard Satellite-based Surface Turbulent Fluxes (GSSTF) data set is part of the NASA Making Earth Science Data Records for Use in Research Environments (MEaSUREs) Project. The objective of this project is to...
Formats: binary | HDF-EOS Timestep: Climatology,Daily,Monthly,Seasonal,Annual Domain: Global
GPCC: Global Precipitation Climatology Centre
Years of Record: 1890/12 to 2018/11
The GPCC provides gridded gauge-analysis products derived from quality controlled station data. Two products are for climate: (a) the Full Data Reanalysis Product  (1901-2010) is recommended for global and regional water balance studies, calibration/validation of remote sensing based rainfall...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Climatology,Daily,Monthly Domain: Global
GPCP V2.3 Monthly analysis for December 2019 (contributed by JJ Wang)
GPCP (Monthly): Global Precipitation Climatology Project
Years of Record: 1978/12 to 2020/06
Data from rain gauge stations, satellites, and sounding observations have been merged to estimate monthly rainfall on a 2.5-degree global grid from 1979 to the present. The careful combination of satellite-based rainfall estimates provides the most complete analysis of rainfall available to date...
Main variables and Earth System components:
Formats: netCDF | binary Timestep: Climatology,Monthly Domain: Global
See Expert Guidance by Pendergrass, Angeline | See Expert Guidance by Wang, Jian-Jian
GRACE: Gravity Recovery and Climate Experiment: Surface mass, total water storage, and derived variables
Years of Record: 2001/12 to 2012/08
The Gravity Recovery and Climate Experiment (GRACE) refers to a pair of NASA satellites that has flown in low-Earth orbit since 2002. The satellites use a precise microwave ranging system to measure the distance between themselves due to gravitational acceleration. Onboard GPS instruments determine...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Daily,Monthly Domain: Global
See Expert Guidance by Swenson, Sean
Gridded Climatology of Clouds from Surface Observations Worldwide (1971-2008)
Years of Record: 1953/12 to 2009/11
This digital archive provides multi-year monthly, seasonal, and annual averages in 5x5-degree grid boxes (or 10x10-degree boxes for some quantities over the ocean). Daytime and nighttime averages, as well as the diurnal average (average of day and night), are given. Nighttime averages were computed...
Main variables and Earth System components:
Formats: ascii Timestep: Climatology,Monthly,Seasonal Domain: Global
See Expert Guidance by Norris, Joel
ISCCP: International Satellite Cloud Climatology Project
Years of Record: 1983/06 to 2009/11
The International Satellite Cloud Climatology Project (ISCCP) makes use of routine observations by operational weather satellites to provide a long-term (1983-2009), gridded, global record of cloud properties. ISCCP uses observations in the visible and infrared window portions of the spectrum to...
Main variables and Earth System components:
Formats: netCDF | binary | HDF Timestep: Climatology,Sub-daily,Monthly Domain: Global
See Expert Guidance by Pincus, Robert
JRA-25
Years of Record: 1978/12 to 2004/11
JRA-25 is a second generation reanalysis product. The model and data assimilation are from the operational system in April 2004. It was the first reanalysis to assimilate wind profiles around tropical cyclones deduced from best-track data, resulting in improved tropical cyclone analysis in a global...
Main variables and Earth System components:
Formats: GRIB Timestep: Sub-daily,Monthly Domain: Global
Liquid Water Path (LWP): UWisc climatology
Years of Record: 1997/12 to 2008/11
"This work describes a new climatology of cloud liquid water path (LWP), termed the University of Wisconsin (UWisc) climatology, derived from 18 yr of satellite-based passive microwave observations over the global oceans. The climatology is based on a modern retrieval methodology applied...
Main variables and Earth System components:
Formats: netCDF Timestep: Climatology,Monthly Domain: Global
Merged Hadley-NOAA/OI Sea Surface Temperature & Sea-Ice Concentration (Hurrell et al, 2008)
Years of Record: 1869/12 to 2020/07
The merged Hadley-OI sea surface temperature (SST) and sea ice concentration (SIC) data sets were specifically developed as surface forcing data sets for AMIP style uncoupled simulations of the Community Atmosphere Model (CAM). The Hadley Centre's SST/SIC version 1.1 (HADISST1), which is derived...
Main variables and Earth System components:
Formats: netCDF Timestep: Monthly Domain: Global, Antarctic, Arctic, NH - Northern Hemisphere, SH - Southern Hemisphere
NASA MERRA
Years of Record: 1978/12 to 2016/01
The Modern Era Retrospective-Analysis for Research and Applications (MERRA) was undertaken by NASA’s Global Modeling and Assimilation Office with two primary objectives: to place observations from NASA’s Earth Observing System satellites into a climate context and to improve upon the hydrologic...
Main variables and Earth System components:
Formats: netCDF | HDF Timestep: Sub-daily,Monthly Domain: Global
NCEP-NCAR (R1): An Overview
Years of Record: 1947/12 to 2021/01
NCEP-NCAR (R1) is the original reanalysis effort. It uses a frozen global state-of-the-art global data assimilation system (as of 11 January 1995). The original database was enhanced (additional, quality checked datasets) by NCAR's Data Support Section. Originally planned to span 1957-96 ("40-Year...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Daily,Monthly Domain: Global
Climate Data Guide image
NOAA 20th-Century Reanalysis, Version 2 and 2c
Years of Record: 1850/11 to 2014/11
The Twentieth Century Reanalysis (20CR) provides a comprehensive global atmospheric circulation data set spanning 1850-2014. Its chief motivation is to provide an observational validation data set, with quantified uncertainties, for assessing climate model simulations of the 20th century, with...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Daily,Monthly Domain: Global
Climate Data Guide Image: PREC/L
Precipitation Reconstruction Land (PREC/L): 1948-present
Years of Record: 1947/12 to 2020/02
Precipitation gauge measurements over land from the GHCN-v2 (Global Historical Climatology Network version 2) are interpolated onto 3 grids: at 0.5, 1 and 2.5 degree resolutions via optimal interpolation. Note: As of May, 2011 the GHCN version 3 station data set is available.
Main variables and Earth System components:
Formats: netCDF | ascii | binary Timestep: Monthly Domain: Global
RAPID: monitoring the Atlantic Meridional Overturning Circulation at 26.5°N
Years of Record: 2004/03 to 2017/01
"The Rapid Climate Change programme (RAPID) explores what causes rapid switches in climate, with a main (but not exclusive) focus on the Atlantic Ocean's thermohaline circulation." "A principal objective of the RAPID programme is the development and maintenance of a pre-operational prototype...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Sub-daily Domain: Atlantic Ocean
Artic sea ice: NASA Team
Sea Ice Concentration data from NASA Goddard and NSIDC based on NASA Team algorithm
Years of Record: 1978/09 to 2014/11
NASA Team sea ice refers to a well-known algorithm used to estimate sea ice concentration from passive microwave brightness temperatures. This page discusses the algorithm itself and the long-term data set ("NSIDC 0051") produced by scientists at NASA Goddard and distributed by NSIDC. The NASA Team...
Main variables and Earth System components:
Formats: netCDF | binary Timestep: Daily,Monthly Domain: Antarctic, Arctic, NH - Northern Hemisphere, SH - Southern Hemisphere
NH Snow Cover Extent, contributed by D. Robinson
Snow Cover Extent (Northern Hemisphere) Climate Data Record, by Rutgers
Years of Record: 1966/09 to 2020/09
The Snow Cover Extent Climate Data Record extends from the late 1960s to present. Historical analyses based on visual inspection have been digitized and combined with modern multi-spectral remote sensing to produce a seamless record on a hemispheric scale. The data are available at weekly and...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Monthly,Weekly Domain: North America
See Expert Guidance by Estilow, Thomas W. | See Expert Guidance by Robinson, David
SST data: COBE: Centennial in situ Observation-Based Estimates
Years of Record: 1890/12 to 2020/02
The COBE data set is a spatially complete, interpolated 1°x1° SST product for 1891 to present. It combines SSTs from ICOADS release 2.0, the Japanese Kobe collection, and reports from ships and buoys. Data are gridded using optimal interpolation. As in HadISST, data up to 1941 were bias-adjusted...
Main variables and Earth System components:
Formats: GRIB Timestep: Monthly Domain: Global
Climate Data Guide Image: HadISST v1.1 SST anomalies and sea ice concentration (August 2012).
SST data: HadiSST v1.1
Years of Record: 1870/01 to 2020/11
The Hadley Centre Global Sea Ice and Sea Surface Temperature (HadISST) is a combination of monthly globally complete fields of SST and sea ice concentration for 1871-present. This page focuses on the SST data; see the separate page for discussion of HadISST sea ice. HadISST uses reduced space...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Monthly Domain: Global
Climate Data Guide Image: HadSST3 (Kennedy et al (2011b)
SST data: HadSST3
Years of Record: 1849/12 to 2017/11
HadSST3 provides monthly SST anomalies on a 5°x5° grid for 1850-present. The anomalies are derived from a 30-year climatology spanning 1961-90.Coverage is global but there is no interpolation; Thus, missing data occur in the final product. The primary input data are from ICOADS release 2.5. Bias...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Monthly Domain: Global
See Expert Guidance by Kennedy, John
annual trends in HadSST4 (created with NCAR Climate Variability Diagnostics Package)
SST data: HadSST4
Years of Record: 1849/12 to 2018/11
HadSST4 provides monthly SST anomalies on a 5°x5° grid for 1850-present. The anomalies are derived from a 30-year climatology spanning 1961-90. Coverage is global but there is no interpolation; Thus, missing data occur in the final product. This means that uncertainties due to limited spatial...
Main variables and Earth System components:
Formats: netCDF Timestep: Monthly Domain: Global
See Expert Guidance by Kennedy, John
SST Data: NOAA Extended Reconstruction SSTs Version 5 (ERSSTv5)
Years of Record: 1853/12 to 2019/07
The NOAA Extended Reconstruction Sea Surface Temperature (ERSST) provides global, spatially complete SST data at a monthly timestep for 1854-present. Version5 is based upon statistical interpolation of the ICOADS release 3.0 data. Argo float data are used in the recent years (since ~2000). The data...
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Climatology,Monthly Domain: Global
See Expert Guidance by Hausfather, Zeke
SST data: NOAA Extended Reconstruction SSTs, version 3 (ERSSTv3 & 3b)
Years of Record: 1853/12 to 2020/01
The NOAA Extended Reconstruction Sea Surface Temperature (ERSST) provides global, spatially complete SST data at a monthly timestep for 1854-present. Version3 is based upon statistical interpolation of the ICOADS release 2.4 data. Version 3 includes satellite AVHRR SST data for 1985 onwards....
Main variables and Earth System components:
Formats: netCDF | ascii Timestep: Monthly Domain: Global
See Expert Guidance by Huang, Boyin | See Expert Guidance by Livermore, Jay | See Expert Guidance by Smith, Tom
UNH/GRDC: Estimated River Runoff
Combines observed river discharge information with a climate-driven Water Balance Model in order to develop composite runoff fields that are consistent with observed discharges. This combination preserves the accuracy of discharge measurements as well as the spatial and temporal distribution of...
Main variables and Earth System components:
Formats: ascii Timestep: Climatology Domain: Global
Climate Data Guide Image: NVAP
Water Vapor from NVAP
Years of Record: 1987/12 to 2001/11
The NASA Water Vapor Project (NVAP) total column water vapor (aka, precipitable water) data sets comprise a combination of radiosonde observations, Television and Infrared Operational Satellite (TIROS) Operational Vertical Sounders (TOVS), and Special Sensor Microwave/Imager (SSM/I) data sets....
Main variables and Earth System components:
Formats: binary Timestep: Daily,Monthly Domain: Global
World Ocean Atlas (WOA09)
World Ocean Atlas 2009 (WOA09) is a set of objectively analyzed (1 degree grid) climatological fields of in situ temperature, salinity, dissolved oxygen, Apparent Oxygen Utilization (AOU), percent oxygen saturation, phosphate, silicate, and nitrate at standard depth levels for annual, seasonal, and...
Formats: netCDF | ascii Timestep: Climatology,Monthly,Seasonal,Annual Domain: Global
Northwest Atlantic regional Sea Water Salinity Annual fields for period of 1995-2004 at 50m depth (contributed by A. Mishonov)
World Ocean Atlas 2013 (WOA13)
Years of Record: 1954/12 to 2012/11
The World Ocean Atlas (WOA) is a set of climatological mean, gridded fields of oceanographic variables based on in-situ measurements from a wide variety of sources.  Global, decadal averages of temperature, salinity, oxygen and nutrients are provided at monthly, seasonal and annual averaging...
Formats: netCDF | ascii | shapefile Timestep: Climatology,Monthly,Seasonal Domain: Global
See Expert Guidance by Mishonov, Alexey
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