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National Institute for Global Environmental Change

Description: This document is the Semi-Annual Report of the National Institute for Global Environmental Change for the reporting period July 1 to December 31, 1991. The report is in two parts. Part I presents the mission of the Institute, examples of progress toward that mission, a brief description of the revised management plan, and the financial report. Part II presents the statements of the Regional Center Directors along with progress reports of the projects written by the researchers themselves.
Date: April 1, 1992
Creator: Werth, G.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recent changes of weather patterns in North America

Description: The objectives of this report are (1) to analyze the time related changes and variability in the property and frequency of air masses and the weather extremes over North America; and, (2) to determine to what degree the observed changes agree with the predictions based on climate models. Climate models predict a general increase of surface air temperature and drought over parts of the North American continent due to increased CO{sub 2} concentrations. Regional climate change results in part fro… more
Date: April 1, 1992
Creator: Kukla, G.J. & Gavin, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radiative Forcing by Long-Lived Greenhouse Gases: Calculations with the AER Radiative Transfer Models

Description: A primary component of the observed, recent climate change is the radiative forcing from increased concentrations of long-lived greenhouse gases (LLGHGs). Effective simulation of anthropogenic climate change by general circulation models (GCMs) is strongly dependent on the accurate representation of radiative processes associated with water vapor, ozone and LLGHGs. In the context of the increasing application of the Atmospheric and Environmental Research, Inc. (AER) radiation models within the … more
Date: April 1, 2008
Creator: Collins, William; Iacono, Michael J.; Delamere, Jennifer S.; Mlawer, Eli J.; Shephard, Mark W.; Clough, Shepard A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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National Institute for Global Environmental Change. Semi-annual report, July 1, 1991--December 31, 1991

Description: This document is the Semi-Annual Report of the National Institute for Global Environmental Change for the reporting period July 1 to December 31, 1991. The report is in two parts. Part I presents the mission of the Institute, examples of progress toward that mission, a brief description of the revised management plan, and the financial report. Part II presents the statements of the Regional Center Directors along with progress reports of the projects written by the researchers themselves.
Date: April 1, 1992
Creator: Werth, G. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Recent changes of weather patterns in North America. Progress report, August 15, 1991--April 1, 1992

Description: The objectives of this report are (1) to analyze the time related changes and variability in the property and frequency of air masses and the weather extremes over North America; and, (2) to determine to what degree the observed changes agree with the predictions based on climate models. Climate models predict a general increase of surface air temperature and drought over parts of the North American continent due to increased CO{sub 2} concentrations. Regional climate change results in part fro… more
Date: April 1, 1992
Creator: Kukla, G. J. & Gavin, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Steady-state and transient modeling of tracer and nutrient distributions in the global ocean. Progress report, August 1, 1993--July 31, 1994

Description: We have completed the studies using the inorganic carbon cycle in the zonally averaged ocean circulation model to calculate anthropogenic uptake of CO, and bomb radiocarbon. While our results are in broad agreement with previous studies, we have learned that horizontal mixing processes due to gyre circulation are important for transient tracer experiments over a few decades. These findings are in press. Using the inorganic carbon cycle model we have started to look at the distributions of {delt… more
Date: April 30, 1994
Creator: Stocker, T. F. & Broecker, W. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pacific Northwest Laboratory annual report for 1992 to the DOE Office of Energy Research. Part 3, Atmospheric and climate research

Description: Within the US Department of Energy`s (DOE`s) Office of Health and Environmental Research (OHER), the atmospheric sciences and carbon dioxide research programs are part of the Environmental Sciences Division (ESD). One of the central missions of the division is to provide the DOE with scientifically defensible information on the local, regional, and global distributions of energy-related pollutants and their effects on climate. This information is vital to the definition and implementation of a … more
Date: April 1, 1993
Creator: Schrempf, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of Cloud Parameterizations in a High Resolution Atmospheric General Circulation Model Using ARM Data

Description: Typical state of the art atmospheric general circulation models used in climate change studies have horizontal resolution of approximately 300 km. As computing power increases, many climate modeling groups are working toward enhancing the resolution of global models. An important issue that arises when resolution of a model is changed is whether cloud and convective parameterizations, which were developed for use at coarser resolutions, will need to be reformulated or re-tuned. We propose to in… more
Date: April 12, 2002
Creator: Govindasamy, B & Duffy, P
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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California Wintertime Precipitation in Regional and Global Climate Models

Description: In this paper, wintertime precipitation from a variety of observational datasets, regional climate models (RCMs), and general circulation models (GCMs) is averaged over the state of California (CA) and compared. Several averaging methodologies are considered and all are found to give similar values when model grid spacing is less than 3{sup o}. This suggests that CA is a reasonable size for regional intercomparisons using modern GCMs. Results show that reanalysis-forced RCMs tend to significant… more
Date: April 27, 2009
Creator: Caldwell, P M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Application of Improved Radiation Modeling to General Circulation Models

Description: This research has accomplished its primary objectives of developing accurate and efficient radiation codes, validating them with measurements and higher resolution models, and providing these advancements to the global modeling community to enhance the treatment of cloud and radiative processes in weather and climate prediction models. A critical component of this research has been the development of the longwave and shortwave broadband radiative transfer code for general circulation model (GCM… more
Date: April 7, 2011
Creator: Iacono, Michael J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Scientific Final Report: COLLABORATIVE RESEARCH: CONTINUOUS DYNAMIC GRID ADAPTATION IN A GLOBAL ATMOSPHERIC MODEL: APPLICATION AND REFINEMENT

Description: This project had goals of advancing the performance capabilities of the numerical general circulation model EULAG and using it to produce a fully operational atmospheric global climate model (AGCM) that can employ either static or dynamic grid stretching for targeted phenomena. The resulting AGCM combined EULAG's advanced dynamics core with the 'physics' of the NCAR Community Atmospheric Model (CAM). Effort discussed below shows how we improved model performance and tested both EULAG and the co… more
Date: April 9, 2012
Creator: Gutowski, William J. & Joseph M. Prusa, Piotr K. Smolarkiewicz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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MEASUREMENTS OF PAST 14C LEVELS AND 13C/12C RATIOS IN THE SURFACE WATERS OF THE WORLD'S SUBPOLAR OCEANS.

Description: Under this project we have developed methods that allow the reconstruction of past {sup 14}C levels of the surface waters of the subpolar North Pacific Ocean by measuring the {sup 14}C contents of archived salmon scales. The overall goal of this research was to reduce of the uncertainty in the uptake of fossil CO{sub 2} by the oceans and thereby improve the quantification of the global carbon cycle and to elucidate the fate of anthropogenic CO{sub 2}. Ocean General Circulation Models (OGCMs), w… more
Date: April 22, 2010
Creator: Brown, T A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hierarchical framework for coupling a biogeochemical trace gas model to a general circulation model

Description: A scheme is described for the computation of terrestrial biogeochemical trace gas fluxes in the context of a general circulation model. This hierarchical system flux scheme (HSFS) incorporates five major components: (1) a general circulation model (GCM), which provides a medium-resolution (i.e., 1{degrees} by 1{degrees}) simulation of the atmospheric circulation; (2) a procedure for identifying regions of defined homogeneity of surface type within GCM grid cells; (3) a set of surface process mo… more
Date: April 1, 1994
Creator: Miller, N. L. & Foster, I. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Surface energy balances of three general circulation models: Current climate and response to increasing atmospheric CO{sub 2}

Description: The surface energy balance simulated by state-of-the-art general circulation models at GFDL, GISS and NCAR for climates with current levels of atmospheric CO{sub 2} concentration (control climate) and with twice the current levels. The work is part of an effort sponsored by the US Department of Energy to assess climate simulations produced by these models. The surface energy balance enables us to diagnose differences between models in surface temperature climatology and sensitivity to doubling … more
Date: April 1, 1988
Creator: Gutowski, W. J.; Gutzler, D. S.; Portman, D. & Wang, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Boundary layer structure over areas of heterogeneous heat fluxes

Description: In general circulation models (GCMs), some properties of a grid element are necessarily considered homogeneous. That is, for each grid volume there is associated a particular combination of boundary layer depth, vertical profiles of wind and temperature, surface fluxes of sensible and latent heat, etc. In reality, all of these quantities may exhibit significant spatial variations within the grid area, and the larger the area the greater the likely variations. In balancing the benefits of higher… more
Date: April 1, 1993
Creator: Doran, J. C.; Barnes, F. J.; Coulter, R. L. & Crawford, T. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent changes of weather patterns in North America. Progress report, August 15, 1992--April 1, 1993

Description: Climate models predict a general increase of surface air temperature and drought frequency in parts of the North American continent due to increased CO{sub 2} concentrations. Regional climate change results in part from the changed frequency of the atmospheric and oceanic circulation patterns in addition to the changed properties of the different air mass types. We are investigating the frequency and properties of the air mass types differentiated by moisture dependent variables and comparing t… more
Date: April 1, 1993
Creator: Kukla, G. J. & Karl, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Southern ocean controls on current ice shelf evolution. Annual progress report, September 1, 1993--August 31, 1994

Description: A seasonal cycle of shelf water temperatures and salinities observed at the eastern Ross Ice Shelf edge was used to force a two-dimensional thermohaline circulation model adapted to two different sub-ice cavity paths around Roosevelt Island. Model results verified by current meter measurements reveal that shelf water flowing into the cavity west of Roosevelt Island might follow a sub-ice path with nearly constant water column thickness of 200 m. This would largely exclude the grounding line of … more
Date: April 1, 1994
Creator: Hellmer, H. H. & Jacobs, S. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Response of precipitation extremes to idealized global warming in an aqua-planet climate model: Towards robust projection across different horizontal resolutions

Description: Current climate models produce quite heterogeneous projections for the responses of precipitation extremes to future climate change. To help understand the range of projections from multimodel ensembles, a series of idealized 'aquaplanet' Atmospheric General Circulation Model (AGCM) runs have been performed with the Community Atmosphere Model CAM3. These runs have been analysed to identify the effects of horizontal resolution on precipitation extreme projections under two simple global warming … more
Date: April 15, 2011
Creator: Li, F.; Collins, W.D.; Wehner, M.F.; Williamson, D.L. & Olson, J.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Potential bias of model projected greenhouse warming in irrigated regions

Description: Atmospheric general circulation models (GCMs) used to project climate responses to increased CO{sub 2} generally omit irrigation of agricultural land. Using the NCAR CAM3 GCM coupled to a slab-ocean model, we find that inclusion of an extreme irrigation scenario has a small effect on the simulated temperature and precipitation response to doubled CO{sub 2} in most regions, but reduced warming by as much as 1 C in some agricultural regions, such as Europe and India. This interaction between CO{s… more
Date: April 27, 2006
Creator: Lobell, D.; Bala, G.; Bonfils, C. & Duffy, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Pacific Northwest Laboratory annual report for 1994 to the DOE Office of Energy Research. Part 2: Atmospheric and climate research

Description: Atmospheric research at Pacific Northwest Laboratory (PNL) occurs in conjunction with the Atmospheric Chemistry Program (ACP) and with the Atmospheric Studies in Complex Terrain (ASCOT) Program. Solicitations for proposals and peer review were used to select research projects for funding in FY 1995. Nearly all ongoing projects were brought to a close in FY 1994. Therefore, the articles in this volume include a summary of the long-term accomplishments as well as the FY 1994 progress made on thes… more
Date: April 1, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Data Preparation and Analysis for Annex III, USA/PRC Cooperation in the Field of Atmospheric Trace Gases

Description: The National Climatic Data Center (NCDC) has been a long-time and very active participant in the joint research program on the Greenhouse Effect created by the bilateral agreement Annex III to the Protocol on Fossil Energy Research and Development on Cooperation in the Field of Atmospheric Trace Gases. This agreement between the US Department of Energy (DOE) and the People's Republic of China, Chinese Academy of Sciences (CAS) has fostered a large amount of data set development and research (Ri… more
Date: April 13, 1999
Creator: Easterling, David R. & Karl, Thomas R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Recent changes of weather patterns in North America

Description: Climate models predict a general increase of surface air temperature and drought frequency in parts of the North American continent due to increased CO[sub 2] concentrations. Regional climate change results in part from the changed frequency of the atmospheric and oceanic circulation patterns in addition to the changed properties of the different air mass types. We are investigating the frequency and properties of the air mass types differentiated by moisture dependent variables and comparing t… more
Date: April 1, 1993
Creator: Kukla, G.J. (Columbia Univ., Palisades, NY (United States). Lamont-Doherty Geological Observatory) & Karl, T. (National Climatic Data Center, Asheville, NC (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Final Technical Report for "Collaborative Research: Regional climate-change projections through next-generation empirical and dynamical models"

Description: This project was a continuation of previous work under DOE CCPP funding in which we developed a twin approach of non-homogeneous hidden Markov models (NHMMs) and coupled ocean-atmosphere (O-A) intermediate-complexity models (ICMs) to identify the potentially predictable modes of climate variability, and to investigate their impacts on the regional-scale. We have developed a family of latent-variable NHMMs to simulate historical records of daily rainfall, and used them to downscale seasonal pred… more
Date: April 8, 2011
Creator: Robertson, A. W.; Ghil, M.; Kravtsov, K. & Smyth, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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