A. J. Simmons

81.6k total citations · 9 hit papers
107 papers, 12.5k citations indexed

About

A. J. Simmons is a scholar working on Atmospheric Science, Global and Planetary Change and Oceanography. According to data from OpenAlex, A. J. Simmons has authored 107 papers receiving a total of 12.5k indexed citations (citations by other indexed papers that have themselves been cited), including 82 papers in Atmospheric Science, 77 papers in Global and Planetary Change and 18 papers in Oceanography. Recurrent topics in A. J. Simmons's work include Climate variability and models (71 papers), Meteorological Phenomena and Simulations (59 papers) and Atmospheric and Environmental Gas Dynamics (26 papers). A. J. Simmons is often cited by papers focused on Climate variability and models (71 papers), Meteorological Phenomena and Simulations (59 papers) and Atmospheric and Environmental Gas Dynamics (26 papers). A. J. Simmons collaborates with scholars based in United Kingdom, United States and France. A. J. Simmons's co-authors include Brian J. Hoskins, D. M. Burridge, Dick Dee, John M. Wallace, A. Hollingsworth, Grant Branstator, Paul Berrisford, Paul Poli, Florence Rabier and Jean‐Noël Thépaut and has published in prestigious journals such as Proceedings of the National Academy of Sciences, Journal of Geophysical Research Atmospheres and Proceedings of the IEEE.

In The Last Decade

A. J. Simmons

105 papers receiving 11.9k citations

Hit Papers

5 papers align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

ERA-20C: An Atmospheric Reanalysis of the Twentieth Century

2016 839 citations Paul Poli, Hans Hersbach et al. Journal of Climate profile →
Barotropic Wave Propagation and Instability, and Atmospheric Teleconnection Patterns

1983 686 citations A. J. Simmons et al. Journal of the Atmospheric Sciences profile →
The ECMWF operational implementation of four‐dimensional variational assimilation. I: Experimental results with simplified physics

2000 675 citations A. J. Simmons et al. Quarterly Journal of the Royal Meteorological Society profile →
The Concept of Essential Climate Variables in Support of Climate Research, Applications, and Policy

2014 655 citations A. J. Simmons et al. Bulletin of the American Meteorological Society profile →
An Energy and Angular-Momentum Conserving Vertical Finite-Difference Scheme and Hybrid Vertical Coordinates

1981 598 citations A. J. Simmons et al. Monthly Weather Review profile →
Low‐frequency variations in surface atmospheric humidity, temperature, and precipitation: Inferences from reanalyses and monthly gridded observational data sets

2010 444 citations A. J. Simmons, Dick Dee et al. profile →
The ERA5 global reanalysis: Preliminary extension to 1950

2021 387 citations Bill Bell, Hans Hersbach et al. Quarterly Journal of the Royal Meteorological Society profile →
An evaluation of ERA5 precipitation for climate monitoring

2022 239 citations David A. Lavers, A. J. Simmons et al. Quarterly Journal of the Royal Meteorological Society profile →
The ERA5 global reanalysis from 1940 to 2022

2024 78 citations Cornel Soci, Hans Hersbach et al. Quarterly Journal of the Royal Meteorological Society profile →

Peers

Countries citing papers authored by A. J. Simmons

Since Specialization

Citations

This map shows the geographic impact of A. J. Simmons's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by A. J. Simmons with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites A. J. Simmons more than expected).

Fields of papers citing papers by A. J. Simmons

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by A. J. Simmons. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by A. J. Simmons. The network helps show where A. J. Simmons may publish in the future.

Co-authorship network of co-authors of A. J. Simmons

This figure shows the co-authorship network connecting the top 25 collaborators of A. J. Simmons. A scholar is included among the top collaborators of A. J. Simmons based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with A. J. Simmons. A. J. Simmons is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	The ERA5 global reanalysis from 1940 to 2022 breakdown → 2024 ·Quarterly Journal of the Royal Meteorological Society ·Cornel Soci, Hans Hersbach, A. J. Simmons, Paul Poli, Bill Bell, Paul Berrisford, Ándrás Horányi, Joaquı́n Muñoz-Sabater, Julien P. Nicolas, Raluca Radu, Dinand Schepers, Sébastien Villaume, Leopold Haimberger, Jack Woollen, Carlo Buontempo, Jean‐Noël Thépaut	78
2	An improved estimate of daily precipitation from the ERA5 reanalysis 2023 ·Atmospheric Science Letters ·David A. Lavers, Hans Hersbach, M. J. Rodwell, A. J. Simmons	10
3	Trends in the tropospheric general circulation from 1979 to 2022 2022 ·Weather and Climate Dynamics ·A. J. Simmons	32
4	The ERA5 global reanalysis: Preliminary extension to 1950 breakdown → 2021 ·Quarterly Journal of the Royal Meteorological Society ·Bill Bell, Hans Hersbach, A. J. Simmons, Paul Berrisford, Per Dahlgren, Ándrás Horányi, Joaquı́n Muñoz-Sabater, Julien P. Nicolas, Raluca Radu, Dinand Schepers, Cornel Soci, Sébastien Villaume, Jean‐Raymond Bidlot, L. Haimberger, Jack Woollen, Carlo Buontempo, Jean‐Noël Thépaut	387
5	WMO Data Exchange – Background, history and impact 2021 ·Lars Peter Riishøjgaard, John W. Zillman, A. J. Simmons, J. R. Eyre	1
6	The ERA5 Global Reanalysis: achieving a detailed record of the climate and weather for the past 70 years. 2020 ·Hans Hersbach, Bill Bell, Paul Berrisford, Per Dahlgren, Ándrás Horányi, Joaquı́n Muñoz-Sabater, Julien P. Nicolas, Raluca Radu, Dinand Schepers, A. J. Simmons, Cornel Soci	23
7	The ERA5 Global Atmospheric Reanalysis at ECMWF as a comprehensive dataset for climate data homogenization, climate variability, trends and extremes. 2019 ·EGU General Assembly Conference Abstracts ·Hans Hersbach, Bill Bell, Paul Berrisford, G. Biavati, Dick Dee, Ándrás Horányi, Julien P. Nicolas, Carole Peubey, Raluca Radu, I. Rozum, Joaquı́n Muñoz-Sabater, Dinand Schepers, A. J. Simmons, Cornel Soci, Jean‐Noël Thépaut, Freja Vamborg	15
8	The ERA5 Reanalysis: Toward 70 years of global high-resolution hourly data for weather and climate applications 2019 ·Julien P. Nicolas, Hans Hersbach, Bill Bell, Paul Berrisford, Dick Dee, Ándrás Horányi, Raluca Radu, Joaquı́n Muñoz-Sabater, Cornel Soci, Dinand Schepers, A. J. Simmons, Jean‐Noël Thépaut, Freja Vamborg	1
9	Observation and integrated Earth-system science: A roadmap for 2016–2025 2016 ·Advances in Space Research ·A. J. Simmons, Jean-Louis Fellous, V. Ramaswamy, Kevin E. Trenberth, Ghassem Asrar, Magdalena Balmaseda, John P. Burrows, Philippe Ciais, Mark R. Drinkwater, Pierre Friedlingstein, Nadine Gobron, Éric Guilyardi, David Halpern, Martin Heimann, Johnny A. Johannessen, P. F. Levelt, Ernesto López-Baeza, Joyce E. Penner, Robert J. Scholes, T. G. Shepherd	30
10	ERA-20C: An Atmospheric Reanalysis of the Twentieth Century breakdown → 2016 ·Journal of Climate ·Paul Poli, Hans Hersbach, Dick Dee, Paul Berrisford, A. J. Simmons, Frédéric Vitart, Patrick Laloyaux, David G. H. Tan, Carole Peubey, Jean‐Noël Thépaut, Yannick Trémolet, Elías Hólm, Massimo Bonavita, Lars Isaksen, Michael Fisher	839
11	On the uses of a new linear scheme for stratospheric methane in global models: water source, transport tracer and radiative forcing 2013 ·Atmospheric chemistry and physics ·Beatriz M. Monge-Sanz, Martyn P. Chipperfield, A. Untch, Jean‐Jacques Morcrette, Alexandru Rap, A. J. Simmons	11
12	Toward a Consistent Reanalysis of the Climate System 2013 ·Bulletin of the American Meteorological Society ·Dick Dee, Magdalena Balmaseda, Gianpaolo Balsamo, Richard Engelen, A. J. Simmons, Jean‐Noël Thépaut	185
13	Improvements in the stratospheric transport achieved by a chemistry transport model with ECMWF (re)analyses: identifying effects and remaining challenges 2012 ·Quarterly Journal of the Royal Meteorological Society ·Beatriz M. Monge-Sanz, Martyn P. Chipperfield, Dick Dee, A. J. Simmons, S. Uppala	45
14	Hydrological cycle. 1) Surface humidity 2011 ·ePrints Soton (University of Southampton) ·(unknown), David I. Berry, A. J. Simmons	1
15	TOWARD A MONITORING AND FORECASTING SYSTEM FOR ATMOSPHERIC COMPOSITION 2008 ·Bulletin of the American Meteorological Society ·A. Hollingsworth, Richard Engelen, (unknown), Angela Benedetti, Oliviér Boucher, Frédéric Chevallier, A. Dethof, Hendrik Elbern, H. J. Eskes, Johannes Flemming, C. Granier, Johannes W. Kaiser, J.‐J. Morcrette, P. J. Rayner, Vincent‐Henri Peuch, Laurence Rouïl, Martin G. Schultz, A. J. Simmons	176
16	Some aspects of the improvement in skill of numerical weather prediction 2002 ·Quarterly Journal of the Royal Meteorological Society ·A. J. Simmons, A. Hollingsworth	379
17	The Determination of the Surface Stress in an Atmospheric Model 1992 ·Monthly Weather Review ·Peter A. E. M. Janssen, Anton Beljaars, A. J. Simmons, Pedro Viterbo	8
18	The effect of spherical geometry on momentum transports in simple baroclinic flows 1976 ·Quarterly Journal of the Royal Meteorological Society ·A. Hollingsworth, A. J. Simmons, Brian J. Hoskins	10
19	The Meridional Scale of Baroclinic Waves 1974 ·Journal of the Atmospheric Sciences ·A. J. Simmons	48
20	Automatic service regulation for London Underground's Central Line 1970 ·WIT transactions on the built environment ·(unknown), (unknown), A. J. Simmons, B. Mellitt	3

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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