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Earth, Atmospheric, and Planetary Sciences

Earth, Atmospheric, and Planetary Sciences

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A modern scleractinian coral with a two-component calcite–aragonite skeleton
Jarosław Stolarski, Ismael Coronado, Jack G. Murphy, Marcelo V. Kitahara, Katarzyna Janiszewska, Maciej Mazur, Anne M. Gothmann, Anne-Sophie Bouvier, Johanna Marin-Carbonne, Michelle L. Taylor, Andrea M. Quattrini, Catherine S. McFadden, John A. Higgins, Laura F. Robinson, and Anders Meibom

PNAS January 19, 2021 118 (3) e2013316117; first published December 15, 2020. https://doi.org/10.1073/pnas.2013316117
Open Access
Lithogenic hydrogen supports microbial primary production in subglacial and proglacial environments
Eric C. Dunham, John E. Dore, Mark L. Skidmore, Eric E. Roden, and Eric S. Boyd

PNAS January 12, 2021 118 (2) e2007051117; first published December 21, 2020. https://doi.org/10.1073/pnas.2007051117
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A hydromorphic reevaluation of the forgotten river civilizations of Central Asia
Willem H. J. Toonen, Mark G. Macklin, Giles Dawkes, Julie A. Durcan, Max Leman, Yevgeniy Nikolayev, and Alexandr Yegorov

PNAS December 29, 2020 117 (52) 32982-32988; first published December 14, 2020. https://doi.org/10.1073/pnas.2009553117
Open Access
A Middle Eocene lowland humid subtropical “Shangri-La” ecosystem in central Tibet
- From the Cover
Tao Su, Robert A. Spicer, Fei-Xiang Wu, Alexander Farnsworth, Jian Huang, Cédric Del Rio, Tao Deng, Lin Ding, Wei-Yu-Dong Deng, Yong-Jiang Huang, Alice Hughes, Lin-Bo Jia, Jian-Hua Jin, Shu-Feng Li, Shui-Qing Liang, Jia Liu, Xiao-Yan Liu, Sarah Sherlock, Teresa Spicer, Gaurav Srivastava, He Tang, Paul Valdes, Teng-Xiang Wang, Mike Widdowson, Meng-Xiao Wu, Yao-Wu Xing, Cong-Li Xu, Jian Yang, Cong Zhang, Shi-Tao Zhang, Xin-Wen Zhang, Fan Zhao, and Zhe-Kun Zhou

PNAS December 29, 2020 117 (52) 32989-32995; first published December 7, 2020. https://doi.org/10.1073/pnas.2012647117
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Vitamin B₁₂-dependent biosynthesis ties amplified 2-methylhopanoid production during oceanic anoxic events to nitrification
Felix J. Elling, Jordon D. Hemingway, Thomas W. Evans, Jenan J. Kharbush, Eva Spieck, Roger E. Summons, and Ann Pearson

PNAS December 29, 2020 117 (52) 32996-33004; first published December 14, 2020. https://doi.org/10.1073/pnas.2012357117
Open Access
Vapor isotopic evidence for the worsening of winter air quality by anthropogenic combustion-derived water
Meng Xing, Weiguo Liu, Xia Li, Weijian Zhou, Qiyuan Wang, Jie Tian, Xiaofei Li, Xuexi Tie, Guohui Li, Junji Cao, Huiming Bao, and Zhisheng An

PNAS December 29, 2020 117 (52) 33005-33010; first published December 15, 2020. https://doi.org/10.1073/pnas.1922840117
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Water emissions put a damper on the coal-to-gas transition
- Jan 11, 2021
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Rapid hydrolysis of tertiary isoprene nitrate efficiently removes NO_x from the atmosphere
Krystal T. Vasquez, John D. Crounse, Benjamin C. Schulze, Kelvin H. Bates, Alexander P. Teng, Lu Xu, Hannah M. Allen, and Paul O. Wennberg

PNAS December 29, 2020 117 (52) 33011-33016; first published December 10, 2020. https://doi.org/10.1073/pnas.2017442117
Open Access
Predicting long-term dynamics of soil salinity and sodicity on a global scale
Amirhossein Hassani, Adisa Azapagic, and Nima Shokri

PNAS December 29, 2020 117 (52) 33017-33027; first published December 14, 2020. https://doi.org/10.1073/pnas.2013771117
Open Access
Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol
John K. Kodros, Dimitrios K. Papanastasiou, Marco Paglione, Mauro Masiol, Stefania Squizzato, Kalliopi Florou, Ksakousti Skyllakou, Christos Kaltsonoudis, Athanasios Nenes, and Spyros N. Pandis

PNAS December 29, 2020 117 (52) 33028-33033; first published December 14, 2020. https://doi.org/10.1073/pnas.2010365117
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Coupled impacts of sea ice variability and North Pacific atmospheric circulation on Holocene hydroclimate in Arctic Alaska
Ellie Broadman, Darrell S. Kaufman, Andrew C. G. Henderson, Irene Malmierca-Vallet, Melanie J. Leng, and Jack H. Lacey

PNAS December 29, 2020 117 (52) 33034-33042; first published December 7, 2020. https://doi.org/10.1073/pnas.2016544117

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