No increase is detected and modeled for the seasonal cycle amplitude of <i>δ</i>¹³C of atmospheric carbon dioxide by F. Joos, F. Joos, S. Lienert, S. Lienert, S. Zaehle

“…Land biosphere carbon exchange is the primary driver of <span class="inline-formula"><i>δ</i>¹³</span>C<span class="inline-formula">_a</span> seasonality in the Northern Hemisphere (NH). …”
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A new portable sampler of atmospheric methane for radiocarbon measurements by G. Zazzeri, G. Zazzeri, L. Wacker, N. Haghipour, P. Gautschi, T. Laemmel, T. Laemmel, S. Szidat, S. Szidat, H. Graven

“…</p> <p>With our sampling line, we achieved a very low blank, 0.7 <span class="inline-formula">µgC</span> compared to 5.5 <span class="inline-formula">µgC</span> in Zazzeri et al. (2021), and a sample precision of 0.9 %, comparable with other measurement techniques for <span class="inline-formula">¹⁴</span>CH<span class="inline-formula">₄</span>, while reducing the sample size to 60 L of air. …”
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Turbulent heat flux dynamics along the Dotson and Getz ice-shelf fronts (Amundsen Sea, Antarctica) by B. Jacob, B. Y. Queste, M. D. du Plessis

“…By obtaining the reconstructed flux, the reduced heat loss bias (12 W m<span class="inline-formula">⁻²</span>) reduced the seasonal bias in sea surface temperature (heat content) to <span class="inline-formula">−</span>0.17 °C (<span class="inline-formula">−</span>3.30 <span class="inline-formula">×</span> 10<span class="inline-formula">⁷</span> J) over the 35 d. …”
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Ice-nucleating particles active below −24&thinsp;°C in a Finnish boreal forest and their relationship to bioaerosols by F. Vogel, F. Vogel, M. P. Adams, L. Lacher, P. B. Foster, G. C. E. Porter, G. C. E. Porter, B. Bertozzi, B. Bertozzi, K. Höhler, J. Schneider, T. Schorr, N. S. Umo, J. Nadolny, Z. Brasseur, P. Heikkilä, E. S. Thomson, N. Büttner, M. I. Daily, R. Fösig, A. D. Harrison, J. Keskinen, U. Proske, U. Proske, U. Proske, J. Duplissy, J. Duplissy, M. Kulmala, T. Petäjä, O. Möhler, B. J. Murray

“…Boreal forests are known as sources of bioaerosol, and recent work indicates that these dominate the INP spectra above <span class="inline-formula">−</span>24 <span class="inline-formula">°C</span>. To quantify the INP population at temperatures below <span class="inline-formula">−</span>24 <span class="inline-formula">°C</span>, we deployed a portable cloud expansion chamber (PINE) in a Finnish boreal forest from 13 March 2018 to 11 May 2018. …”
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Considerations for determining warm-water coral reef tipping points by P. Pearce-Kelly, A. H. Altieri, J. F. Bruno, C. E. Cornwall, M. McField, A. I. Muñiz-Castillo, J. Rocha, R. O. Setter, C. Sheppard, R. M. Roman-Cuesta, C. Yesson

“…Considering observed and projected stressor impacts, we endorse the global tipping point revision's conclusion of a global mean surface temperature (relative to pre-industrial) tipping point threshold of 1.2 <span class="inline-formula">°C</span> (range 1–1.5 <span class="inline-formula">°C</span>) and the long-term impacts of atmospheric <span class="inline-formula">CO₂</span> concentrations above 350 ppm, while acknowledging that comprehensive assessment of stressors, including ocean warming response dynamics, overshoot, and cascading impacts, have yet to be sufficiently realised. …”
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Andreybulakhite, Ni(C₂O₄)&thinsp; ⋅ &thinsp;2H₂O, the first natural nickel oxalate by O. S. Vereshchagin, S. N. Britvin, S. N. Britvin, D. V. Pankin, M. S. Zelenskaya, M. G. Krzhizhanovskaya, M. A. Kuz'mina, N. S. Vlasenko, O. V. Frank-Kamenetskaya

“…<p>Andreybulakhite, ideally Ni(C<span class="inline-formula">₂</span>O<span class="inline-formula">₄</span>) <span class="inline-formula">⋅</span> 2H<span class="inline-formula">₂</span>O, is a new member of the humboldtine group, named in honour of Andrey Glebovich Bulakh of Saint Petersburg State University. …”
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Chemical composition of the discharge fluid from IDDP-2, Reykjanes, Iceland by I. Galeczka, I. Galeczka, F. Óskarsson, K. G. Mesfin, J. E. Jónsson

“…Additional research is required to evaluate if the discharge of the well has a signature of a fluid that originates at depths corresponding to supercritical conditions of seawater (<span class="inline-formula"><i>T</i></span> <span class="inline-formula">&gt;</span> 403 °C, <span class="inline-formula"><i>P</i></span> <span class="inline-formula">&gt;</span> 285 bar).…”
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New probabilistic methods for quantitative climate reconstructions applied to palynological data from Lake Kinneret by T. Netzel, A. Miebach, T. Litt, A. Hense

“…In terms of climate ranges, the posterior probability of the Mediterranean biome reveals the greatest change, with an average boreal winter (December–February) temperature of <span class="inline-formula">10^∘C</span> and an annual precipitation of 700 mm for Lake Kinneret during the Holocene. …”
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ARMTRAJ: a set of multipurpose trajectory datasets augmenting the Atmospheric Radiation Measurement (ARM) user facility measurements by I. Silber, J. M. Comstock, M. R. Kieburtz, L. M. Russell

“…Here, we describe ARMTRAJ (<span class="uri">https://doi.org/10.5439/2309851</span>, Silber, 2024a; <span class="uri">https://doi.org/10.5439/2309849</span>, Silber, 2024b; <span class="uri">https://doi.org/10.5439/2309850</span>, Silber, 2024c; <span class="uri">https://doi.org/10.5439/2309848</span>, Silber, 2024d), a set of multipurpose trajectory datasets that helps close this gap in ARM deployments. …”
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Measurement report: The ice-nucleating activity of lichen sampled in a northern European boreal forest by U. Proske, U. Proske, U. Proske, M. P. Adams, G. C. E. Porter, M. A. Holden, M. A. Holden, J. Bäck, B. J. Murray

“…INPs derived from lichen sampled during HyICE-2018 are shown to nucleate ice at temperatures as warm as <span class="inline-formula">−5</span> <span class="inline-formula">°C</span> with <span class="inline-formula">10³</span> INPs per gram of lichen. …”
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Southern Ocean control on atmospheric CO₂ changes across late Pliocene Marine Isotope Stage M2 by S. Hou, L. Toebrock, M. van der Linden, F. Rothstegge, M. Ziegler, L. J. Lourens, P. K. Bijl

“…<p>During the Pliocene, atmospheric <span class="inline-formula">CO₂</span> concentrations (<i>p</i><span class="inline-formula">CO₂</span>) were probably sometimes similar to today's, and global average temperature was <span class="inline-formula">∼3 °C</span> higher than preindustrial. However, the relationships and phasing between variability in climate and <i>p</i><span class="inline-formula">CO₂</span> on orbital timescales are not well understood. …”
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The effect of groundwater depth on topsoil organic matter mineralization during a simulated dry summer in northwestern Europe by A. Françoys, A. Françoys, O. Mendoza, J. Hu, P. Boeckx, W. Cornelis, S. De Neve, S. Sleutel

“…We examined (1) upward moisture flow by capillary action along the soil profile, specifically into the top 20 cm of soil, and (2) the effect of the GWT on the decomposition of an added <span class="inline-formula">¹³C</span>-enriched substrate (ryegrass) over a period of 10 weeks, with limited wetting events representing a dry summer. …”
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Understanding summertime peroxyacetyl nitrate (PAN) formation and its relation to aerosol pollution: insights from high-resolution measurements and modeling by B. Hu, B. Hu, B. Hu, N. Chen, N. Chen, R. Li, M. Huang, M. Huang, M. Huang, J. Chen, J. Chen, Y. Hong, Y. Hong, L. Xu, L. Xu, X. Fan, X. Fan, M. Li, M. Li, L. Tong, Q. Zheng, Y. Yang

“…Controlling emissions of VOCs, particularly alkenes, C<span class="inline-formula">₅</span>H<span class="inline-formula">₈</span>, and aromatics, would mitigate PAN pollution. …”
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