# Most-cited Earth and Planetary Sciences papers of 2020, with free PDFs

The 25 most-cited Earth and Planetary Sciences research papers published in 2020, ranked by citations in OpenAlex, with their original abstracts and free PDFs where available.

1. [The ERA5 global reanalysis](https://nerdi.pages.dev/paper/W3025949386) · 31,412 citations
2. [The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP)](https://nerdi.pages.dev/paper/W3015391807) · 7,899 citations · Free PDF
3. [An astronomically dated record of Earth’s climate and its predictability over the last 66 million years](https://nerdi.pages.dev/paper/W3084856838) · 2,177 citations
4. [Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP)](https://nerdi.pages.dev/paper/W3048882402) · 2,001 citations · Free PDF
5. [SHCal20 Southern Hemisphere Calibration, 0–55,000 Years cal BP](https://nerdi.pages.dev/paper/W3048951226) · 1,532 citations · Free PDF
6. [Improvements of the Daily Optimum Interpolation Sea Surface Temperature (DOISST) Version 2.1](https://nerdi.pages.dev/paper/W3107200375) · 1,190 citations
7. [Present‐Day Crustal Deformation of Continental China Derived From GPS and Its Tectonic Implications](https://nerdi.pages.dev/paper/W2999289209) · 1,087 citations
8. [Cenozoic sea-level and cryospheric evolution from deep-sea geochemical and continental margin records](https://nerdi.pages.dev/paper/W3025424653) · 928 citations
9. [Sources of particulate-matter air pollution and its oxidative potential in Europe](https://nerdi.pages.dev/paper/W3101215304) · 872 citations · Free PDF
10. [Complexity revealed in the greening of the Arctic](https://nerdi.pages.dev/paper/W3003362684) · 870 citations · Free PDF
11. [Extending the Global Mass Change Data Record: GRACE Follow‐On Instrument and Science Data Performance](https://nerdi.pages.dev/paper/W3026223029) · 800 citations
12. [The acidity of atmospheric particles and clouds](https://nerdi.pages.dev/paper/W2980782403) · 791 citations · Free PDF
13. [Global distribution of carbonate rocks and karst water resources](https://nerdi.pages.dev/paper/W3018262654) · 764 citations · Free PDF
14. [Increases in surface ozone pollution in China from 2013 to 2019: anthropogenic and meteorological influences](https://nerdi.pages.dev/paper/W3091850311) · 745 citations · Free PDF
15. [Pervasive ice sheet mass loss reflects competing ocean and atmosphere processes](https://nerdi.pages.dev/paper/W3023307059) · 742 citations · Free PDF
16. [Influence of meteorological conditions on PM2.5 concentrations across China: A review of methodology and mechanism](https://nerdi.pages.dev/paper/W3015976670) · 739 citations
17. [Arctic Sea Ice in CMIP6](https://nerdi.pages.dev/paper/W3017049878) · 709 citations · Free PDF
18. [Marine Heatwaves](https://nerdi.pages.dev/paper/W4213272360) · 708 citations
19. [The Impacts of Ocean Acidification on Marine Ecosystems and Reliant Human Communities](https://nerdi.pages.dev/paper/W3037095854) · 682 citations
20. [A Systematic, Regional Assessment of High Mountain Asia Glacier Mass Balance](https://nerdi.pages.dev/paper/W3003669653) · 669 citations · Free PDF
21. [Past climates inform our future](https://nerdi.pages.dev/paper/W3096938517) · 668 citations
22. [Global increase in major tropical cyclone exceedance probability over the past four decades](https://nerdi.pages.dev/paper/W3025838273) · 667 citations
23. [A global anthropogenic emission inventory of atmospheric pollutants from sector- and fuel-specific sources (1970–2017): an application of the Community Emissions Data System (CEDS)](https://nerdi.pages.dev/paper/W3033530208) · 656 citations · Free PDF
24. [Projections of global-scale extreme sea levels and resulting episodic coastal flooding over the 21st Century](https://nerdi.pages.dev/paper/W3046153628) · 636 citations · Free PDF
25. [The Chemistry Mechanism in the Community Earth System Model Version 2 (CESM2)](https://nerdi.pages.dev/paper/W3013886998) · 616 citations

Canonical page: https://nerdi.pages.dev/papers/earth-and-planetary-sciences/most-cited-2020