4,926 Works

HIAPER Cloud Radar (HCR)

The HIAPER cloud radar (HCR) is an airborne, polarimetric, millimeter-wavelength radar that will serve the atmospheric science community by providing cloud remote sensing capabilities to the NSF/NCAR G-V (HIAPER) aircraft.

ETOPO2, Global 2 Arc-minute Ocean Depth and Land Elevation from the US National Geophysical Data Center (NGDC)

Global elevation and bathymetry on 2 arc-minute grid from the National Geophysical Data Center (NGDC). This dataset was original published in September 2001 and was revised to include correction to Caspian Sea area in April 2006. It contains improvements that include the blending of satellite altimetry with ocean soundings and new land elevation data from the Global Land One-km Base Elevation (GLOBE) project.

NCEP Climate Forecast System Reanalysis (CFSR) Selected Hourly Time-Series Products, January 1979 to December 2010

Suranjana Saha, Shrinivas Moorthi, Hua-Lu Pan, Xingren Wu, Jie Wang, Sudhir Nadiga, Patrick Tripp, Robert Kistler, John Woollen, David Behringer, Haixia Liu, Diane Stokes, Robert Grumbine, George Gayno, Jun Wang, Yu-Tai Hou, Hui-Ya Chuang, Hann-Ming H. Juang, Joe Sela, Mark Iredell, Russ Treadon, Daryl Kleist, Paul Van Delst, Dennis Keyser, John Derber … & Mitch Goldberg
The National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR) was initially completed over the 31-year period from 1979 to 2009 and has been extended to March 2011. NCEP has created selected time series products at hourly temporal resolution by combining either 1) the analysis and one- through five-hour forecasts, or 2) the one- through six-hour forecasts, for each initialization time. Please note that NCEP only created time series for parameter/level combinations that...

WCRP and WWRP THORPEX YOTC (Year of Tropical Convection) Project

The realistic representation of tropical convection in our global atmospheric models is a long-standing grand challenge for numerical weather forecasts and global climate predictions. Our lack of fundamental knowledge and practical capabilities in this area leaves us disadvantaged in modeling and predicting prominent phenomena of the tropical atmosphere such as the ITCZ, ENSO, TBO, monsoons and their active or break periods, the MJO, subtropical stratus decks, near-surface ocean properties, easterly waves, tropical cyclones, bulk budgets...

ECMWF's Operational Model Analysis, starting in 2011

European Center for Medium-Range Weather Forecasts (ECMWF) atmospheric operational model analyses and products derived from short-term forecasts. These data are archived at the highest resolution of the data assimilation and forecast system. The free atmospheric data are on constant pressure surfaces and there are many surface fields, single level integrated fields, and boundary layer fields. This dataset is an extension of the older and lower resolution ECMWF operational output datasets in the NCAR Research Data...

ERA40 T106 Analysis Fields on Pressure Surfaces, created at NCAR

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DS127.1 represents a higher resolution version of ds124.1 [http://rda.ucar.edu/datasets/ds124.1/]. Both ds124.1 and 127.1 were implemented and computed by NCAR's Data Support Section, and form an essential part of efforts undertaken in late 2004, early 2005, to produce an archive of selected segments of ERA-40 on a standard transformation grid. In the case of ds127.1, ERA-40 6-hourly upper air variables on 23 pressure levels were transformed from either spherical harmonics (geopotential, temperature, vertical pressure velocity, vorticity,...

ERA40 T106 Analysis Fields on Model Levels, created at NCAR

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DS127.2 represents a dataset implemented and computed by NCAR's Data Support Section, and forms an essential part of efforts undertaken in late 2004, early 2005, to produce an archive of selected segments of ERA-40 on standard transformation grids. In this case, ERA-40 6-hourly upper air variables on 60 model levels were transformed from either spherical harmonics (surface geopotential, temperature, vertical velocity, vorticity, logarithm of surface pressure, divergence), or a reduced N80 Gaussian grid (specific humidity,...

Unidata Integrated Data Viewer

Don Murray, Jeff McWhirter, Stuart Weir, Yuan Ho & Julien Chastang
The Unidata Integrated Data Viewer (IDV) is a software application for analyzing and displaying geoscience data. The IDV emphasizes interactive three-dimensional visualization and integration of diverse data types. The IDV software is available for Windows, Mac OS X, and various flavors of Unix including Linux, and Solaris.

NCAR GPS Advanced Upper-Air Sounding System (GAUS)

GAUS is a balloon-borne rawinsonde sounding system. Through GPS technology, the GAUS measures high vertical resolution of temperature, humidity and winds at locations around the world. Each system includes a meteorological observing station to record thermodynamic data at the surface and the infrastructure to provide local data processing, display and communications. Data from GAUS can be transferred by phone, Internet or the Global Telecommunication System (GTS) to scientists at universities, other research institutions and operational...

Three-View Cloud Particle Imager (3V-CPI) for HIAPER

Paul Lawson &
The Three-View Cloud Particle Imager (3V-CPI) is a combination of three imaging instruments. Two of them comprise a 2D-S instrument, in which two 2D probes image particles as they pass through beams that are oriented orthogonally to each other and the airflow. If particles also lie in the intersection of the sensitive areas of the two beams, they are seen by both 2D probes. In that case, the CPI is triggered to take a high-resolution...

GNSS Instrument System for Multi-static and Occultation Sensing (GISMOS) for HIAPER

James Garrison, Jennifer Haase &
The Purdue GPS multistatic and occultation instrument for atmospheric, land, and ocean remote sensing (GISMOS) is an instrument to measure the water vapor distribution in the troposphere by inversion of the bending angle profile produced during occultation of a GPS satellite by the limb of the Earth. The instrument also uses GPS signals reflected from land or ocean to determine properties of those surfaces (soil moisture and surface roughness, respectively). Occultation samples represent distances of...

Time-of-Flight Aerosol Mass Spectrometer (ToF-AMS) for HIAPER

Jose Jimenez &
This is a version of the Aerodyname Aerosol Mass Spectrometer (AMS), with time-of-flight (TOF) capability, built and certified for operation on the NSF/NCAR GV (HIAPER). It is based on the original quadrupole design, but the addition of TOF capability increases the sensitivity and time (hence spatial) resolution and enables characterization of single particles. The basic measurement is size-resolved determination of the chemical composition of sub-micrometer non-refractory particles with spatial resolution typically less than 1 km.

Autonomous Airborne Ozone Photometer for HIAPER

W. Terry Rawlins, Michael Proffitt &
The HIAPER GV dual-beam, ultraviolet absorption ozone photometer is designed to measure atmospheric ozone mixing ratios in flight by ultraviolet absorption of a flowing air sample in a dual-beam, temperature-controlled sample cell. It is configured for either autonomous or interactive operation within the cabin of the HIAPER GV aircraft. Graphical user interface software provides real-time and post-flight data processing and analysis capabilities for rapid data evaluation and archival. The instrument has been fully inte grated...

JRA-55C: The Japanese 55-year Reanalysis Using Conventional Data Only

As a subset of the Japanese 55-year Reanalysis (JRA-55) project, the Meteorological Research Institute of the Japan Meteorological Agency has conducted a global atmospheric reanalysis that assimilates only conventional surface and upper air observations, with no use of satellite observations, using the same data assimilation system as the JRA-55. The project, named the JRA-55 Conventional (JRA-55C), aims to produce a more homogeneous dataset over a long period, unaffected by changes in historical satellite observing systems....

Asynchronous Communication in Spectral Element and Discontinuous Galerkin Methods for Atmospheric Dynamics

Benjamin Jamroz & Robert Klöfkorn
The scalability of computational applications on current and next generation supercomputers is increasingly limited by the cost of inter-process communication. We implement non-blocking asynchronous communication in the High-Order Methods Modeling Environment for the time-integration of the hydrostatic fluid equations using both the Spectral Element and Discontinuous Galerkin methods. This allows the overlap of computation with communication effectively hiding some of the costs of communication. A novel detail about our approach is that it provides some...

Biomass Data [Grebmeier-Cooper] - Preliminary. Version 1.0 [PRELIMINARY]

L. Cooper & J. Grebmeier
Biomass is in gC/m2 Note: This dataset is preliminary.

Generalized additive modelling of daily precipitation extremes and their climatic drivers

Mari Jones, Stephen Blenkinsop, Hayler Fowler, David Stephenson & Christopher Kilsby
Detection of changes in climate responses is essential to facilitate appropriate adaptation actions to be taken by decision makers, particularly where changes in the arrival rate and intensity of extreme daily precipitation event may lead to high impact flooding. Long established hydrological practice may no longer be appropriate if these changes are significant over the engineering design life. While extreme daily precipitation events are known to be seasonally over-dispersed, the dependent relationship between events is...

ERA-40 Global Upper Air Radiosonde Observation Feedback Record Reports

ERA-40 Global Upper Air Radiosonde Observation Feedback Record Reports include 6 hourly upper air radiosonde observation (RAOB) feedback record reports from RAOBs used in the ECMWF 45-year reanalysis (ERA-40) covering the period from September 1957 to August 2002. RAOBs, from multiple data sources, were assimilated into an ECMWF model and produced ERA-40. Select variables found in the reports include temperature, pressure, height, relative humidity, specific humidity, zonal wind, and meridional wind speed components. Data may...

NCEP Climate Forecast System Reanalysis (CFSR) 6-hourly Products, January 1979 to December 2010

Suranjana Saha, Shrinivas Moorthi, Hua-Lu Pan, Xingren Wu, Jie Wang, Sudhir Nadiga, Patrick Tripp, Robert Kistler, John Woollen, David Behringer, Haixia Liu, Diane Stokes, Robert Grumbine, George Gayno, Jun Wang, Yu-Tai Hou, Hui-Ya Chuang, Hann-Ming H. Juang, Joe Sela, Mark Iredell, Russ Treadon, Daryl Kleist, Paul Van Delst, Dennis Keyser, John Derber … & Mitch Goldberg
The National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR) was initially completed over the 31-year period from 1979 to 2009 and has been extended to March 2011. CFSR was initialized 4 times per day (0000, 0600, 1200, and 1800 UTC), and the 6-hourly atmospheric, oceanic and land surface analyzed products are available at 0.3, 0.5, 1.0, 1.9, and 2.5 degree horizontal resolutions, along with forecast hours 1 through 6. However, not all...

Community Demographic Model International Migration (CDM-IM) Dataset : Generating Age and Gender Profiles of International Migration Flows

Raphael J Nawrotzki & Leiwen Jiang
The demographic features of a growing number of international migrants increasingly impacts socioeconomic development in various countries of the world. However, information on international migrant’s demographic characteristics is sparse. To develop the multiregional population/urbanization projections module of the NCAR Community Demographic Model (CDM) requires information on the age and gender composition of international migration streams. This paper reports on the methods used to generate the CDM International Migration dataset, which contains information on the age...

The dynamical influence of topography on the large-scale motion of the atmosphere

Akira Kasahara
In an attempt to understand the dynamical influence of the earth's topography upon the large-scale motion of the atmosphere, the system of "shallow water" equations on the rotating earth is integrated numerically. The model consists of an incompressible, homogeneous, hydrostatic and inviscid fluid. The "beta-plane" approximation is used to simplify the model. The fluid is confined in a channel bounded by two parallel "walls" extended to the west and east directions. Periodic boundary conditions are...

The radiative cooling calculation for application to general circulation experiments

Takashi Sasamori
The Atmospheric Radiation Tables (ART) of Elsasser and Culbertson were used to calculate the atmospheric radiation, and the results are compared with those of other methods. The cooling rate calculated from ART agrees well with cooling rates calculated by more accurate methods; but the downward flux of water vapor bands computed from ART was found to be too small. This discrepancy may be attributed to the assumption of the temperature correction for the absorption coefficients...

Comparison between wind waves at sea and in the laboratory

G Hess, G Hidy & E Plate
Correlations between laboratory and geophysical data are presented for certain statistical properties of wind waves. The parameters chosen include (a) Relations between mean wave height, and the height of the highest one-third or one-tenth waves, as given by a Rayleigh probability distribution, and (b) Amplitude spectra for waves, as given by Phillips' equilibrium theory. The correlation between laboratory results and geophysical data is very satisfactory over a wide range of wave size.

NCAR global general circulation model of the atmosphere

Akira Kasahara & Warren Washington
This paper describes a model of the general circulation of the earth's atmosphere which has been developed and experimented with, since 1964, at the National Center for Atmospheric Research (NCAR), Boulder, Colorado. A distinguishing feature of the NCAR model is that the vertical coordinate is height rather than pressure, though hydrostatic equilibrium is maintained in the system. In fact, the dynamical framework of the model is very similar to the one proposed by L. F,...

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