# Most-cited Earth and Planetary Sciences papers of 2018, with free PDFs

The 25 most-cited Earth and Planetary Sciences research papers published in 2018, ranked by citations in OpenAlex, with their original abstracts and free PDFs where available.

1. [IsoplotR: A free and open toolbox for geochronology](https://nerdi.pages.dev/paper/W2796600848) · 3,553 citations
2. [Declining oxygen in the global ocean and coastal waters](https://nerdi.pages.dev/paper/W2781567654) · 3,246 citations · Free PDF
3. [Trends in China's anthropogenic emissions since 2010 as the consequence of clean air actions](https://nerdi.pages.dev/paper/W2800203331) · 2,936 citations · Free PDF
4. [Improved Estimation of the Specific Attenuation and Backscatter Differential Phase over Short Rain Paths](https://nerdi.pages.dev/paper/W2896333791) · 2,416 citations
5. [Historical (1750–2014) anthropogenic emissions of reactive gases and aerosols from the Community Emissions Data System (CEDS)](https://nerdi.pages.dev/paper/W2600399632) · 2,219 citations
6. [Longer and more frequent marine heatwaves over the past century](https://nerdi.pages.dev/paper/W2797541543) · 2,121 citations · Free PDF
7. [Anthropogenic drivers of 2013–2017 trends in summer surface ozone in China](https://nerdi.pages.dev/paper/W2908510209) · 1,808 citations
8. [Slab2, a comprehensive subduction zone geometry model](https://nerdi.pages.dev/paper/W2887429768) · 1,498 citations
9. [MSWEP V2 Global 3-Hourly 0.1° Precipitation: Methodology and Quantitative Assessment](https://nerdi.pages.dev/paper/W2890873664) · 1,409 citations
10. [Volatile chemical products emerging as largest petrochemical source of urban organic emissions](https://nerdi.pages.dev/paper/W2785649357) · 1,376 citations · Free PDF
11. [The State of the World’s Beaches](https://nerdi.pages.dev/paper/W2801765526) · 1,153 citations · Free PDF
12. [Recent Third Pole’s Rapid Warming Accompanies Cryospheric Melt and Water Cycle Intensification and Interactions between Monsoon and Environment: Multidisciplinary Approach with Observations, Modeling, and Analysis](https://nerdi.pages.dev/paper/W2893104692) · 1,150 citations
13. [Changing state of Arctic sea ice across all seasons](https://nerdi.pages.dev/paper/W2890288701) · 1,137 citations
14. [Climate-change–driven accelerated sea-level rise detected in the altimeter era](https://nerdi.pages.dev/paper/W2790934709) · 1,120 citations
15. [Severe Surface Ozone Pollution in China: A Global Perspective](https://nerdi.pages.dev/paper/W2884846562) · 1,041 citations
16. [Deep learning to represent subgrid processes in climate models](https://nerdi.pages.dev/paper/W2808559252) · 1,036 citations · Free PDF
17. [The Global Precipitation Climatology Project (GPCP) Monthly Analysis (New Version 2.3) and a Review of 2017 Global Precipitation](https://nerdi.pages.dev/paper/W2795581443) · 990 citations · Free PDF
18. [Arctic sea ice thickness, volume, and multiyear ice coverage: losses and coupled variability (1958–2018)](https://nerdi.pages.dev/paper/W2897516365) · 929 citations
19. [Gridded emissions of air pollutants for the period 1970–2012 within EDGAR v4.3.2](https://nerdi.pages.dev/paper/W2796842028) · 888 citations · Free PDF
20. [Data assimilation in the geosciences: An overview of methods, issues, and perspectives](https://nerdi.pages.dev/paper/W2752514830) · 876 citations · Free PDF
21. [JRA-55 based surface dataset for driving ocean–sea-ice models (JRA55-do)](https://nerdi.pages.dev/paper/W2883537372) · 870 citations
22. [Validation of the CHIRPS satellite rainfall estimates over eastern Africa](https://nerdi.pages.dev/paper/W2795550267) · 843 citations
23. [Categorizing and Naming Marine Heatwaves](https://nerdi.pages.dev/paper/W2804828516) · 810 citations
24. [Global long-term observations of coastal erosion and accretion](https://nerdi.pages.dev/paper/W2888493296) · 800 citations · Free PDF
25. [Google Earth Engine Applications Since Inception: Usage, Trends, and Potential](https://nerdi.pages.dev/paper/W2890225206) · 790 citations · Free PDF

Canonical page: https://nerdi.pages.dev/papers/earth-and-planetary-sciences/most-cited-2018