Full, open, and timely access to environmental data benefits science and society and is critical to the American Meteorological Society (AMS) community, including academic, government, nonprofit, and commercial interests. All of these groups benefit from the exchange of data related to the Earth system. For example, modern society relies on accurate weather forecasts for protection of life and property and as a basis for routine decisions. Indeed, prompt and accurate forecasts are not possible without the exchange of data among the 191 World Meteorological Organization (WMO) Member States and Member Territories under the World Weather Watch Program, per policies stated in WMO Resolution 40 and Resolution 25 . Beyond weather forecasting, the research, education, and business communities increasingly need access to global environmental data. The global and complex nature of environmental problems requires that research be conducted collaboratively by distributed teams of investigators, which often necessitates sharing data, knowledge, and other resources. In addition, technical and policy ecosystems related to environmental data are changing rapidly, requiring the AMS stakeholder groups to reassess their approaches to data collection and sharing.
The purpose of this statement is to reaffirm AMS’s commitment to a policy of full, open, and timely access to data that are critical to the advancement of atmospheric and related sciences, the provision of products and services for the benefit of society, and the promotion of commerce and private-sector activities. Adopting such policies could accelerate scientific discoveries, broaden and enhance participation in scientific enterprise, promote entrepreneurship, and benefit society.
AMS encourages its stakeholder communities to provide full, open, and timely access to environmental data and derived data products, as well as all associated information necessary to fully understand and properly use the data (metadata). In this context, full means that all data and metadata should be available, open means that it should be available to anyone who requests it, and timely means that it should be available as soon as possible, particularly in the case of data critical to human health and safety. These data are at the foundation of efforts to ensure public safety and national security, as well as efficient management and use of weather- and climate-sensitive sectors and systems such as water resources, transportation, and agriculture. Environmental data are used to protect critical infrastructure and support scientific publications, and they are essential for routine and high-impact weather forecasting and warning and climate monitoring. “Data,” in this statement, refers to entities or outputs used as evidence of phenomena for the purposes of research or scholarship. The spectrum of data is diverse and includes in situ and remotely sensed observations, environmental predictions generated by numerical models, and data products derived from integrations of observational and model-generated sources.
For all data types, the provision of metadata and the use of widely accepted data and metadata format standards are critical. Data and metadata formats that have open and machine-readable specifications allow people to access and use data via a variety of services and software packages. Open formats encourage the sharing of data and their associated analysis tools. Maintaining the relationships between data, the software used to analyze them, and any publications or documents that result from the use of data and software is critical to establishing the transparency and trustworthiness of scientific work. These relationships are typically maintained through documentation of provenance, that is, the steps that were taken to transform, analyze, and visualize data.
In addition, AMS expects all scholarly papers published in its journals to contain sufficiently detailed references to public sources of information (literature and data) and methodology such that independent research can test the paper’s scientific conclusions. This expectation is codified in the AMS “Data Archiving and Citation” guidelines within the AMS Publications’ Author Guide , which provides recommendations for how data and metadata used to produce scientific conclusions presented in journal articles should be properly archived, cited, and made readily available to the scientific community.
Data discoverability, whatever the mechanism, is necessary to facilitate full, open, and timely access to data. Beyond increasing data discoverability through the scientific literature, there have been significant steps made by major search engines to use modern web standards for marking up datasets for discovery. The use of persistent web-accessible identifiers and community accepted metadata schema to identify and describe the dataset are recommended to take advantage of web-based data discovery and access.
The AMS concept of full, open, and timely access is to promote, to the greatest extent possible, data availability. Many governmental scientific agencies within the United States and internationally already have data policies in place , and have taken steps to ensure that data upon which scientific studies are based are preserved and made available at little or no cost to users. These policies emphasize the importance of data management planning and establish common expectations for data archiving and sharing. Such policies should continue to evolve as new data collection instruments are developed and as new uses and users of data emerge.
However, AMS recognizes that there are often are significant costs associated with the collection, creation, storage, value-adding, and distribution of data. Therefore, it is reasonable for commercial data providers to charge for access to their data at rates commensurate with their value and costs.
Further, AMS recognizes that government agencies, academia, and private-sector entities face additional challenges in meeting the goals of open data. Some of these challenges include policies that inhibit the widest possible use of data, such as resource constraints, intellectual property rights, ethical and legal constraints related to human privacy or personal data ownership, and inadequate infrastructure to properly maintain and administer datasets. As one example, the European Union’s General Data Protection Regulation (GDPR) regulates the use of data that may be directly or indirectly related to individuals from the EU .
To advance the goals of this statement and address these challenges, AMS proposes the following core principles and recommendations. These points are aligned with the growing international movement to enable scientific data to be FAIR: Findable, Accessible, Interoperable, and Reusable . These principles and recommendations are intended to inform national and international data policies and influence standard practices in academia, government, and the private sector in the pursuit of open access to data.
AMS recommends these guidelines to all institutions and individuals involved with environmental and related data:
 AMS Publications. 2017. Data Archiving and Citation
 See, for example:
U.S. Executive Office of the President, Office of Management and Budget, "Open Data Policy-Managing Information as an Asset," https://www.whitehouse.gov/sites/whitehouse.gov/files/omb/memoranda/2013/m-13-13.pdf
Group on Earth Observations (GEO), “Data Sharing Principles,” https://www.earthobservations.org/geoss_dsp.shtml
 European Union, General Data Protection Regulation (GDPR) https://ec.europa.eu/commission/priorities/justice-and-fundamental-rights/data-protection/2018-reform-eu-data-protection-rules_en
 Wilkinson, M. D., and Coauthors, 2016: The FAIR Guiding Principles for scientific data management and stewardship. Scientific Data, 3, 160018. https://doi.org/10.1038/sdata.2016.18.
[This statement is considered in force until April 2024 unless superseded by a new statement issued by the AMS Council before this date.]