This abbreviated report summarizes presentations and discussion during the U.S. CLIVAR 2013 Summit, including each of the three Panel breakout sessions.
This tool creates a time series of downscaled (gridded) crop and pasture land use outcomes, given a scenario for climate and for aggregate cropland and pasture for world regions.
The recent growth in the size and complexity of climate data as well as the availability of cluster and supercomputing resources has brought parallel programming to the attention of geostatisticans. The National Center for Atmospheric Research's (NCAR) supercomputer facility is an accessible and powerful resource for any scientist or statistician working in climate-related fields. This technical report presents a tutorial for users of the statistical language R to quickly utilize the massively parallel computational resources...
Fourth Annual Progress Report for a SOST Near-Term Priority: Assessing Meridional Overturning Circulation Variability: Implications for Rapid Climate ChangeW. Johns, P. Chang, G. Danabasoglu, P. Heimbach, Y. Kushnir, Y. Kwon, M. Patterson, S. Lozier, J. Willis & R. Zhang
The report is the fourth annual progress report submitted by the U.S. AMOC Science Team. The purpose of this report is to summarize progress on the main objectives of the program, identify any programmatic gaps, and make recommendations on near‐term research priorities for the program.
Understanding the Dynamic Response of Greenland's Marine Terminating Glaciers to Oceanic and Atmospheric Forcing: A White PaperF. Straneo, O. Sergienko & P. Heimbach
The U.S. CLIVAR GRISO Working Group concludes that ice-ocean-atmosphere interactions in Greenland represent a new research frontier that is critical to understanding glacier evolution and ice sheet mass balance. Recent observed changes in Greenland show that these processes are important in the context of decadal-to-centennial climate variability. A synthesis of the science and a detailed set of recommendations are provided in this white paper.
The U.S. CLIVAR Salinity Working Group aimed to understand the role that the oceanic hydrologic cycle played in our understanding of climate change and variability. This report is the summary of the findings and recommendations arising from the Working Group activities.
This dataset contains indicators for characterizing observed streamflow droughts in 603 stations through the major watershed regions of the conterminous U.S. The dataset is based on observed streamflow data from Hydro-Climatic Data Network 2009, developed by the U.S. Geological Survey. Due to multi-attributable aspect of this natural hazard, analyzing the various feature of droughts is necessary. This dataset is useful to help advance water resources decision-making and will allow researchers to identify trends as well...
A Science and Implementation Plan for EPIC: An Eastern Pacific Investigation of Climate Processes in the Coupled Ocean-Atmosphere SystemR. Weller
This document describes The Eastern Pacific Investigation of Climate processes (EPIC) in the ocean-atmosphere--a five-year process study to improve the understanding of the intertropical convergence zone, to observe and understand the ocean-atmosphere processes, and to observe and understand properties of the extensive boundary layer cloud decks in the southeasterly tradewind and cross-equatorial flow regime.
The International Comprehensive Ocean-Atmosphere Data Set (ICOADS) is a global ocean marine meteorological and surface ocean dataset. It is formed by merging many national and international data sources that contain measurements and visual observations from ships (merchant, navy, research), moored and drifting buoys, coastal stations, and other marine platforms. The coverage is global and sampling density varies depending on date and geographic position relative to shipping routes and ocean observing systems. The monthly summary time...
This report summarizes presentations and discussion during the U.S. CLIVAR 2011 Summit, including the Panel breakout sessions.
This document summarizes a prioritzed plan for the U.S. CLIVAR Pan-American Climate Studies Program that encompasses a broad range of activities that include empirical and modeling studies, as well as the development and analysis of historical datasets to arrive at a better understanding and simulation of the phenomena that control the seasonal rainfall patterns and their variability on seasonal-to-decadal timescales.
The EarthScope USArray Transportable Array (TA) contains over 400 seismic station platforms deployed in a pseudo-grid fashion (spaced approximately 70 km apart) across a portion of the United States. This array is part of a large initiative within the geoscience field to improve earth mapping and understanding of subsurface properties. Individual platforms report for 1 to 2 years and then are retrieved and redeployed farther east. Atmospheric pressure sensors were added to many platforms in...
This technical note discusses the Method for Object-Based Diagnostic Evaluation (MODE), which is part of the Model Evaluation Tools (MET) verification software package. MODE is an implementation of one approach to object-based verification (we’ll discuss what this means shortly). Working with objects is more intuitive for most forecast users and providers than working with traditional verification statistics such as Probability of Detection (POD) or False Alarm Ratio (FAR). It allows statements about (for example) size,...
This document describes the scientific aspects of the Hurricane Weather Research and Forecasting (HWRF) modeling system. This is based on 2015 HWRF v3.7a public release. This technical note along with the HWRF v3.7a Users Guide provides the user with the scientific description and running instructions for HWRF.
This dataset contains monthly river flow rates for 4,425 locations around the world except for the former Soviet Union. This dataset combines the UNESCO set [https://rda.ucar.edu/datasets/ds552.0/] plus 3,455 gauges, thus improving spatial coverage over much of the world with major gains in Brazil, Australia and Argentina. The "new" gauges have not been subjected to the rigorous comparisons of the benchmark UNESCO portion. Their locations, names, and drainage areas have been edited, and obvious errors (e.g....
DART is a community facility for ensemble DA developed and maintained by the Data Assimilation Research Section (DAReS) at the National Center for Atmospheric Research (NCAR). DART provides modelers, observational scientists, and geophysicists with powerful, flexible DA tools that are easy to implement and use and can be customized to support efficient operational DA applications.
Workshop on Analyses, Dynamics, and Modeling of Large-scale Meteorological Patterns Associated with Extreme Temperature and Precipitation EventsR. Grotjahn, M. Barlow, R. Black, T. Cavazos, W. Gutowski, J. Gyakum, R. Katz, A. Kumar, L. Leung, R. Schumacher & M. Wehner
The report synthesizes the findings and discussion of a June 2013 workshop to explore data issues, statistical and dynamical methods, and modeling approaches to enable improved analysis and simulation of short-term (5 days or less) extreme events in North America. It also presents a set of recommendations to accelerate progress in this important field of research.
This tool computes heatwave days at each grid cell of the global land region over the Community Earth System Model (CESM) grid and matches population counts at the same spatial scale to compute population exposure to heatwaves, measured in units of person-day.
This dataset contains files that are an ensemble of 'coupler history' files from an 80-member reanalysis performed with the Data Assimilation Research Testbed (DART) using the Community Atmosphere Model Version 4 with the finite volume core (CAM4 FV) at 1.9 degree by 2.5 degree resolution. The observations assimilated include all those used in the NCEP/NCAR reanalysis (temperature and wind components from radiosondes, aircraft, and satellite drift winds) plus radio occultation observations from the COSMIC satellites...
This report details the efforts of numerous scientists in helping both the Ocean Carbon Uptake and Southern Ocean Working Groups make progress towards their goals to develop metrics for evaluating biases in CMIP- 5 model simulations; estimating sources of uncertainties in model projections of heat and carbon uptake; and informing future observations, model development, and analysis strategies for addressing biases and uncertainties (including protocols of CMIP-6).
Proceedings of the U.S. CLIVAR Workshop on the Dynamics and Predicatbility of the Atlantic ITCZ and its Regional Climatic InfluencesY. Kushnir, A. Robertson, M. Ward & S. Zebiak
This report summarizes presentations and discussion during the U.S. CLIVAR workshop to identify and prioritize the issues and recommend a plan of action to advance understanding andprediction of tropical Atlantic climate variability.
Third Annual Progress Report for a JSOST Near-Term Priority: Assessing Meridional Overturning Circulation Variability: Implications for Rapid Climate ChangeU.S. CLIVAR Project Office
The report is the third annual progress report submitted by the U.S. AMOC Science Team. The purpose of this report is to summarize progress on the main objectives of the program, identify any programmatic gaps, and make recommendations on near‐term research priorities for the program.
The Sun4Cast® Solar Power Forecasting System: The Result of the Public-Private-Academic Partnership to Advance Solar Power ForecastingSue Ellen Haupt, Branko Kosovic, Tara Jensen, Jared Lee, Pedro Jimenez Munoz, Jeffrey Lazo, James Cowie, Tyler McCandless, Julia Pearson, Gerry Wiener, Stefano Alessandrini, Luca Delle Monache, Dantong Yu, Zhenzhou Peng, Dong Huang, John Heiser, Shinjae Yoo, Paul Kalb, Steven Miller, Matthew Rogers & Laura Hinkleman
The National Center for Atmospheric Research (NCAR) led a partnership to advance the state-of-the-science of solar power forecasting by designing, developing, building, deploying, testing, and assessing the Sun4Cast® Solar Power Forecasting System. The project included cutting-edge research, testing in several geographically and climatologically diverse high penetration solar utilities and ISOs, and wide dissemination of the research results to raise the bar on solar power forecasting technology. The partners included three other national laboratories, six universities,...
This document describes what the U.S. CLIVAR Scientific Steering Committeee hoped to achieve between 2000 and 2010 in observing and understanding the phenomena of climate variability in and around the Atlantic basin in support of Atlantic CLIVAR programs; it sets out a prioritized and integrated plan for sustained observations, and modeling and theoretical investigations of the atmosphere-ocean-land coupled system.