How to Cite AGU (American Geophysical Union)

You’re deep into your geophysical research paper, citing groundbreaking studies on seismic activity, atmospheric dynamics, or ocean circulation patterns published in prestigious AGU journals. But you pause—should this be Geophysical Research Letters or Geophys. Res. Lett.? Does the DOI format matter? Where exactly do volume and issue numbers belong? One formatting error could undermine the credibility of months of research. The American Geophysical Union (AGU) maintains specific citation standards that earth and space scientists must navigate precisely. This guide demonstrates exactly how to cite AGU journal articles, conference proceedings, datasets, technical reports, and special publications using proper author-date formatting, correct journal abbreviations, DOI protocols, and reference list structures that meet AGU’s rigorous standards while ensuring your geophysical research citations communicate authority and precision across atmospheric science, hydrology, oceanography, solid earth geophysics, and space physics contexts.

Understanding AGU Publications and Citation Context

The American Geophysical Union publishes research across earth and space sciences through multiple journals, conference proceedings, and special publications. Each publication type requires specific citation approaches while maintaining consistent author-date formatting principles.

AGU as a Scientific Publishing Organization

Founded in 1919, AGU serves as a nonprofit organization advancing earth and space sciences through scientific publication, conferences, and community engagement. The organization publishes peer-reviewed research across atmospheric sciences, biogeosciences, cryosphere studies, geodesy, geomagnetism, hydrology, ocean sciences, planetary sciences, seismology, space physics, tectonophysics, and volcanology. AGU’s journals rank among the most cited in geophysical research, making proper citation critical for scholarly communication in these fields.

Primary AGU Journal Publications

AGU operates multiple specialized journals targeting distinct earth science subdisciplines:

• Journal of Geophysical Research (JGR): Subdivided into seven sections covering atmospheres, biogeosciences, earth surface, oceans, planets, solid earth, and space physics
• Geophysical Research Letters (GRL): High-impact letters presenting time-sensitive geophysical discoveries
• Geochemistry, Geophysics, Geosystems (G-Cubed): Interdisciplinary research on earth and planetary processes
• Water Resources Research: Focused on hydrology and water science
• Journal of Advances in Modeling Earth Systems (JAMES): Earth system modeling and simulation
• Tectonics: Deformation and evolution of Earth’s lithosphere
• Space Weather: Research and applications in space weather science

Conference Proceedings and Abstracts

AGU hosts major scientific meetings including the annual Fall Meeting (one of the largest earth science conferences globally) and specialized Chapman Conferences. Researchers present findings through oral presentations and posters, with abstracts published in conference proceedings. These conference contributions represent preliminary research often later published as full journal articles, requiring appropriate citation when referenced in scholarly work.

AGU Citation Format Overview

AGU publications utilize an author-date citation system closely resembling APA style with specific modifications for geophysical research contexts. Understanding these formatting principles ensures consistent, accurate citations across your research documentation.

Author-Date Citation System

The author-date system places author surname(s) and publication year within your text, directing readers to full reference details in your bibliography. In-text citations take the form (Author, Year) for single-author works, (Author1 & Author2, Year) for two authors, or (Author et al., Year) for three or more authors. According to AGU’s official grammar and style guide, this system enables readers to identify sources quickly while maintaining text flow, distinguishing it from numbered citation systems used in some scientific fields.

Core Citation Components

Complete AGU citations require specific elements presented in prescribed order:

Component	Description	Example
Author Names	Surname followed by initials, separated by commas	Thompson, R. L., Martinez, J. A., & Chen, Y.
Publication Year	Year in parentheses immediately after authors	(2024)
Article Title	Sentence case, no italics or quotation marks	Tropospheric ozone variability during monsoon transitions
Journal Name	Italicized, properly abbreviated per AGU standards	J. Geophys. Res. Atmos.
Volume Number	Italicized volume number	129
Issue Number	In parentheses after volume (not italicized)	(12)
Article Number/Pages	AGU article identifier or page range	e2023JD040125 or 8456-8472
DOI	Full DOI URL providing persistent link	https://doi.org/10.1029/2023JD040125

Distinguishing AGU Format from Other Scientific Styles

While AGU citation resembles APA format, several distinctions matter for geophysical research:

• Journal abbreviations: AGU uses specific abbreviations for its journals (e.g., Geophys. Res. Lett.) rather than full titles
• Article identifiers: Many AGU articles use unique identifiers (e.g., e2023JD040125) instead of traditional page numbers
• DOI formatting: AGU requires complete DOI URLs (https://doi.org/10.1029/…) rather than just the identifier
• Author formatting: AGU separates authors with commas and uses ampersand (&) before final author

Citing AGU Journal Articles

Journal articles represent the most common AGU publication type cited in geophysical research. Proper citation format varies slightly depending on whether articles use traditional page numbers or AGU’s article identifier system.

Standard Journal Article Citation Format

The complete format for AGU journal articles follows this structure:

Single-Author Article Example

Two-Author Article Example

Multiple-Author Article Example

Article with Traditional Page Numbers

Some older AGU articles or certain publications use traditional page ranges rather than article identifiers:

Article Number System Explanation

Modern AGU journals assign unique article identifiers encoding publication information. For example, e2023JD040125 breaks down as:

• e: Indicates electronic publication
• 2023: Publication year
• JD: Journal abbreviation (JD = Journal of Geophysical Research: Atmospheres)
• 040125: Unique article number within that journal/year

These identifiers replace traditional page numbers, providing permanent article references independent of print formatting.

AGU Journal Abbreviations and Naming Conventions

AGU maintains standardized abbreviations for its journals. Using correct abbreviations ensures your citations meet professional standards and facilitate accurate source identification.

Complete AGU Journal Abbreviation List

Full Journal Name	Standard Abbreviation	Subject Focus
Journal of Geophysical Research: Atmospheres	J. Geophys. Res. Atmos.	Atmospheric science and meteorology
Journal of Geophysical Research: Biogeosciences	J. Geophys. Res. Biogeosci.	Biological and geochemical cycles
Journal of Geophysical Research: Earth Surface	J. Geophys. Res. Earth Surf.	Geomorphology and surface processes
Journal of Geophysical Research: Oceans	J. Geophys. Res. Oceans	Oceanography and marine science
Journal of Geophysical Research: Planets	J. Geophys. Res. Planets	Planetary science
Journal of Geophysical Research: Solid Earth	J. Geophys. Res. Solid Earth	Geophysics and seismology
Journal of Geophysical Research: Space Physics	J. Geophys. Res. Space Phys.	Space physics and magnetospheres
Geophysical Research Letters	Geophys. Res. Lett.	High-impact rapid communications
Geochemistry, Geophysics, Geosystems	Geochem. Geophys. Geosyst.	Interdisciplinary earth science
Water Resources Research	Water Resour. Res.	Hydrology and water science
Tectonics	Tectonics	Structural geology and tectonics
Paleoceanography and Paleoclimatology	Paleoceanogr. Paleoclimatol.	Past ocean and climate conditions
Reviews of Geophysics	Rev. Geophys.	Comprehensive review articles
Space Weather	Space Weather	Space weather science and applications
Journal of Advances in Modeling Earth Systems	J. Adv. Model. Earth Syst.	Earth system modeling
Earth and Space Science	Earth Space Sci.	Open-access earth and space research
Earth’s Future	Earth’s Future	Interdisciplinary sustainability research
GeoHealth	GeoHealth	Environmental health and earth science

In-Text Citation Rules for AGU Sources

In-text citations identify sources within your manuscript text, directing readers to complete reference information in your bibliography. AGU follows author-date conventions with specific formatting rules.

Single-Author In-Text Citations

For sources with one author, include surname and year in parentheses. If incorporating the author’s name in your sentence, only the year requires parentheses:

Two-Author In-Text Citations

For sources with two authors, include both surnames connected with ampersand (&) in parenthetical citations or “and” in narrative citations:

Multiple-Author In-Text Citations

For sources with three or more authors, cite only the first author’s surname followed by “et al.” (Latin for “and others”):

Multiple Citations in Single Reference

When citing multiple sources supporting the same point, arrange alphabetically by first author surname, separated by semicolons:

Citing Same Author, Different Years

When referencing multiple works by the same author from different years, separate years with commas:

Citing Same Author, Same Year

For multiple publications by identical authors in the same year, add lowercase letters (a, b, c) after the year to distinguish them:

Reference List Formatting for AGU Publications

Your reference list provides complete bibliographic information for all sources cited in your text. AGU reference lists follow specific formatting conventions ensuring consistency and completeness.

Reference List Organization

AGU reference lists organize entries alphabetically by first author surname. Multiple works by the same author arrange chronologically from oldest to newest. The reference list appears at your manuscript’s end with the heading “References” (not “Bibliography” or “Works Cited”).

Author Name Formatting

List all authors regardless of number (unlike in-text citations using “et al.”). Format as: Surname, Initials., Surname, Initials., & Surname, Initials. Use commas between authors and ampersand (&) before the final author:

Hanging Indent Formatting

Format reference entries with hanging indents—the first line begins at the margin while subsequent lines indent (typically 0.5 inches). This formatting helps readers distinguish between separate references:

Punctuation and Spacing

Follow these punctuation rules consistently:

• Period after author names (including final initial)
• Space after periods in initials (R. J., not R.J.)
• Period after publication year in parentheses
• Period after article title
• Comma after journal name (italicized)
• Comma after volume and issue numbers
• Period after article number or page range
• No period after DOI URL

Citing AGU Conference Proceedings and Abstracts

AGU conferences—particularly the Fall Meeting—generate thousands of presentation abstracts annually. These preliminary research communications require citation when referenced in scholarly work, though with different formatting than peer-reviewed articles.

Conference Abstract Citation Format

The basic structure for AGU conference abstracts:

Fall Meeting Abstract Example

Online Abstract with Retrieval URL

When abstracts are available online through AGU’s abstract database, include the retrieval URL:

Chapman Conference Proceedings

Chapman Conferences are smaller, topically focused AGU meetings. Citation format resembles Fall Meeting abstracts:

Citing AGU Datasets and Research Data

Geophysical research increasingly relies on shared datasets from field observations, remote sensing, numerical models, and laboratory experiments. Proper dataset citation gives credit to data producers and enables research reproducibility.

Dataset Citation Format

AGU dataset citations follow this structure:

Published Dataset Example

Institutional Repository Dataset

Model Output Dataset

Numerical model outputs shared as datasets require citation identifying the model, version, and dataset specifics:

Supplementary Data from Journal Articles

When citing supplementary datasets accompanying published articles, reference both the article and the specific dataset:

Citing AGU Technical Reports and Monographs

AGU occasionally publishes technical reports, monographs, and special reports documenting significant research initiatives or community assessments. These publications require citation formats distinguishing them from journal articles.

Technical Report Citation Format

AGU Technical Report Example

Government Agency Report

Geophysical research often references reports from agencies like NOAA, NASA, or USGS. Format these as:

Citing Specific Report Sections

When referencing particular report sections rather than entire documents, identify the section:

Citing AGU Special Publications and Books

AGU publishes books and special volumes compiling research on focused topics. These edited volumes or monographs require citation approaches distinguishing them from journal articles.

Edited Book Citation Format

AGU Monograph Example

Chapter in Edited Volume

When citing specific chapters rather than entire books, include chapter authors, title, and page numbers:

AGU Geophysical Monograph Series

The Geophysical Monograph Series represents AGU’s premier book publication line. Include the series and volume number:

DOI Usage in AGU Citations

Digital Object Identifiers (DOIs) provide permanent links to publications regardless of URL changes. AGU requires DOI inclusion for all sources where available, using specific formatting conventions.

DOI Format Requirements

Present DOIs as complete URLs beginning with https://doi.org/ followed by the identifier. Never include periods after DOI URLs:

AGU DOI Structure

AGU DOIs follow predictable patterns enabling verification. The structure: 10.1029/[journal code][year][article number]

• 10.1029: AGU’s publisher identifier prefix
• Journal code: Two-letter abbreviation (JD = JGR Atmospheres, JA = JGR Space Physics, etc.)
• Year: Publication year
• Article number: Unique identifier within that journal/year

Finding Missing DOIs

For older publications potentially lacking DOIs, search CrossRef (https://search.crossref.org/) or contact AGU directly. Many older articles have received retrospective DOI assignment. When DOIs genuinely don’t exist, substitute direct article URLs:

Handling Multiple Authors in AGU Citations

Geophysical research frequently involves large collaborative teams. AGU formatting handles multiple authors differently in text citations versus reference lists, with specific rules for various author counts.

In-Text Citation Rules by Author Count

Author Count	In-Text Format	Example
1 author	Surname (Year)	Anderson (2024)
2 authors	Surname & Surname (Year)	Chen & Rodriguez (2024)
3+ authors	Surname et al. (Year)	Thompson et al. (2023)

Reference List Author Formatting

Unlike in-text citations, reference lists include all authors regardless of number. Separate author names with commas, using ampersand (&) before the final author:

Author Name Variations

Handle different name formats consistently:

• Compound surnames: Include hyphens and spaces as written (Garcia-Martinez, Van der Berg)
• Suffix indicators: Include Jr., Sr., II, III after surname before initials (Smith Jr., R. L.)
• Corporate authors: Use full organization name when no individual authors listed (National Oceanic and Atmospheric Administration)
• Non-English names: Preserve original spelling and diacritical marks (López, Müller, Kovács)

Volume, Issue, and Page Number Formatting

Correctly formatting volume, issue, and pagination information ensures readers can locate exact articles within journal archives.

Volume and Issue Number Presentation

Format volume numbers in italics followed by issue numbers in parentheses (not italicized). Some journals omit issue numbers when pagination continues across issues within a volume:

Article Number vs. Page Range

Modern AGU articles use unique article numbers (e.g., e2023JD039876) rather than traditional page numbers. Older articles display page ranges. Use whichever the article provides:

Continuous vs. Issue-Based Pagination

Some journals paginate continuously throughout a volume (volume 129 runs from page 1 to page 12,543), while others restart pagination with each issue (each issue of volume 129 begins at page 1). Issue numbers become essential when pagination restarts:

Citing AGU Online Resources and Websites

Beyond peer-reviewed publications, AGU provides online resources including educational materials, policy statements, databases, and organization information. These digital resources require appropriate citation when referenced.

AGU Website Content Citation

For content from AGU’s website without individual authors, use the organization as author:

AGU Educational Resources

Blogs and News Articles

AGU publishes blogs and news through platforms like The Bridge and Eos. Include author names when available:

Online Databases and Tools

When citing online databases or web-based tools provided by AGU:

Citation Management Tools for AGU References

Reference management software simplifies AGU citation processes, automatically formatting references and managing large bibliographies. Several tools support AGU citation styles effectively.

Recommended Citation Software

• Zotero: Free, open-source tool with robust AGU citation style support and browser integration for capturing references directly from AGU publications
• Mendeley: Free reference manager with PDF annotation, citation style customization, and collaborative bibliography features
• EndNote: Professional citation software offering advanced formatting options and integration with manuscript writing platforms
• Papers: Comprehensive reference management combining PDF organization, citation formatting, and research discovery

Using DOIs with Citation Software

Most citation managers can import complete reference information automatically from DOIs. Copy the DOI from an AGU article and paste it into your citation software’s import function—the software retrieves all bibliographic metadata, reducing manual entry errors.

Verifying Software-Generated Citations

While citation software provides valuable automation, always verify generated citations against AGU standards. Software occasionally misformats journal abbreviations, omits DOIs, or incorrectly structures author names. Review each reference carefully before submission, cross-checking against examples in recent AGU publications.

Common AGU Citation Mistakes to Avoid

Researchers frequently commit specific citation errors when referencing AGU publications. Awareness of these common mistakes helps you maintain citation accuracy.

Journal Abbreviation Errors

Using incorrect or inconsistent journal abbreviations represents the most frequent AGU citation mistake. Researchers create ad hoc abbreviations or inconsistently abbreviate journal names across their reference lists.

Missing or Incorrect DOIs

Omitting DOIs when available or formatting them incorrectly undermines citation utility. Common DOI errors include:

• Using “doi:” or “DOI:” prefix instead of full URL
• Adding period after DOI URL
• Linking to proxy URLs instead of official doi.org links
• Including broken or incomplete DOI identifiers

Incomplete Author Lists

Reference lists must include all authors, not truncated “et al.” versions. While in-text citations abbreviate author lists, reference entries require complete author information enabling readers to identify individual contributors.

Volume/Issue Formatting Confusion

Researchers frequently confuse volume and issue formatting, either italicizing issue numbers, omitting necessary issue numbers, or reversing their order. Remember: volume(issue).

Article Number vs. Page Range Errors

Attempting to convert article numbers into page ranges or inventing page numbers when only article identifiers exist creates false information. Use whichever pagination system the article employs without modification.

Verification and Citation Accuracy

Ensuring citation accuracy requires systematic verification processes confirming that references precisely match source materials and follow formatting standards.

Cross-Checking Against Original Sources

Verify citations against actual publications rather than relying on secondary sources or citation databases. Directly consult the AGU article, checking:

• Author names (spelling, initials, order)
• Publication year
• Article title (exact wording, capitalization)
• Journal name and section
• Volume and issue numbers
• Article number or page range
• DOI accuracy

Testing DOI Links

Click DOI links to verify they resolve to correct articles. Broken DOIs result from typographical errors, incomplete identifiers, or attempting to link articles lacking DOIs. When DOIs fail to resolve, consult the publisher’s website directly to confirm whether DOIs exist and obtain correct identifiers.

Consistency Checks Across References

Review your complete reference list checking for formatting consistency. All entries should follow identical structures for similar publication types. Inconsistency often reveals copy-paste errors or incomplete editing from earlier drafts.

Comparing to Recent AGU Publications

Consult reference lists in recently published AGU articles as formatting models. AGU’s own publications demonstrate current citation standards, providing reliable templates when you’re uncertain about specific formatting questions.

FAQs About Citing AGU Publications

Understanding AGU Citation Precision in Geophysical Research

Citing AGU publications accurately demonstrates your engagement with the geophysical research community and respect for scholarly communication standards. The American Geophysical Union maintains rigorous publication practices across earth and space sciences, expecting authors to reference sources with precision matching the scientific rigor of their research content. Proper AGU citation goes beyond mechanical formatting compliance—it enables readers to locate sources efficiently, gives appropriate credit to original researchers, and integrates your work into ongoing scientific conversations spanning atmospheric dynamics, ocean circulation, seismic activity, and space weather phenomena.

The author-date system AGU employs balances reader accessibility with comprehensive source documentation. In-text citations provide immediate author and date context without interrupting text flow, while detailed reference lists supply complete bibliographic information enabling source retrieval. This dual structure serves multiple audiences: fellow researchers verifying your evidence, students learning from your methodology, and reviewers assessing your literature engagement. Each citation component—author names, publication year, article title, journal abbreviation, volume, issue, article number, and DOI—serves specific functions in this communication ecosystem.

Understanding AGU’s specific formatting requirements prevents common errors undermining research credibility. Journal abbreviations follow standardized conventions distinguishing between JGR sections, maintaining consistency across geophysical subdisciplines. DOI inclusion provides permanent article access regardless of publisher website restructuring or URL changes. Article number systems replacing traditional pagination reflect digital publishing evolution while maintaining citation precision. Volume and issue formatting enables navigation through decades of AGU archives, connecting your contemporary research to foundational studies shaping geophysical understanding.

Different AGU publication types require adapted citation approaches reflecting their distinct roles in scientific communication. Peer-reviewed journal articles receive full citation treatment with complete author lists, specific journal sections, volume/issue details, and article identifiers. Conference abstracts represent preliminary findings, requiring presentation context including meeting name, location, dates, and abstract numbers. Datasets deserve citation as research products themselves, crediting data creators and enabling reproducibility through persistent identifiers. Technical reports, monographs, and special publications contribute specialized knowledge requiring appropriate attribution alongside journal articles.

Multiple-author citations in geophysical research present specific challenges given large collaborative teams characterizing modern earth science. In-text citations streamline author lists using “et al.” for readability while reference lists preserve complete author information honoring all contributors. This balance acknowledges collaborative research realities without overwhelming readers with extensive author lists interrupting text flow. Proper author formatting—including initials, surname spelling, and institutional affiliations—ensures individuals receive appropriate credit for their intellectual contributions.

DOI usage represents critical best practice in AGU citation, providing robust linking infrastructure connecting citations to source materials permanently. Unlike URLs potentially changing when publishers restructure websites, DOIs offer stable identifiers resolving to current article locations. AGU’s DOI structure (10.1029/identifier) enables quick recognition of AGU-published materials while supporting automated citation tracking and impact assessment. Testing DOI functionality before submission catches typographical errors preventing reader access to your referenced sources.

Citation management software streamlines AGU reference formatting, particularly for manuscripts citing dozens of sources across multiple publication types. Tools like Zotero, Mendeley, and EndNote automate format application, maintain consistent style throughout reference lists, and enable quick bibliography updates when revising manuscripts. However, software automation never replaces human verification—always review software-generated citations against AGU standards, catching errors in journal abbreviations, author names, or DOI formatting that automated systems occasionally produce.

Common citation mistakes—incorrect journal abbreviations, missing DOIs, incomplete author lists, volume/issue formatting errors, and article number confusion—typically result from insufficient attention to AGU’s specific conventions rather than intentional disregard. Systematic verification processes catch these errors: cross-checking citations against original sources, testing DOI links, ensuring consistency across references, and comparing your formatting to recent AGU publications. This quality control investment protects your research from appearing careless or disconnected from professional standards.

Special publication types including conference proceedings, datasets, technical reports, and online resources require thoughtful citation approaches acknowledging their distinct characteristics. Conference abstracts capture time-sensitive preliminary findings deserving citation despite lacking peer review’s formal validation. Research datasets enable reproducibility and meta-analysis, warranting full citation crediting data producers. Technical reports document community assessments and methodology developments supplementing peer-reviewed literature. Online resources provide educational materials and organizational position statements contributing to scientific discourse beyond traditional publications.

Understanding broader citation context enhances your AGU reference practices. Citations serve multiple functions: documenting evidence supporting your claims, acknowledging intellectual debts to previous researchers, enabling readers to explore topics deeper through source materials, and positioning your work within existing research conversations. Each citation represents a node in scientific communication networks, connecting your research to broader knowledge production in geophysical sciences. Precise citations strengthen these connections while imprecise references weaken scholarly communication infrastructure.

Your citation practices reflect your research professionalism and respect for scientific community norms. Reviewers, editors, and readers assess your scholarly credibility partly through citation quality—accurate references signal attention to detail and engagement with relevant literature, while error-filled citations raise questions about research rigor. This perception extends beyond citation formatting to assumptions about your data analysis, methodology implementation, and conclusion validity. The extra effort ensuring citation precision protects your research reputation.

As geophysical research evolves—incorporating new data types, computational methods, and interdisciplinary collaborations—citation practices adapt to maintain information accessibility. Article numbering systems accommodate digital-first publishing models. Dataset citations recognize data as citable research products. Software and code citations acknowledge computational contributions to scientific discoveries. Staying current with evolving AGU citation standards positions your research within contemporary scientific communication practices rather than relying on outdated conventions.

This comprehensive understanding of AGU citation principles, formats, and standards equips you to reference geophysical research accurately across journal articles, conference proceedings, datasets, reports, and online resources. Apply these guidelines systematically, verify citations carefully, and engage citation management tools strategically. Your precise AGU citations demonstrate research professionalism, facilitate scientific communication, and integrate your work into the collaborative knowledge production characterizing earth and space sciences. The investment in citation accuracy pays dividends through enhanced research credibility and strengthened scholarly communication.