Research papers, made mini. One-page, plain-language summaries of new research.https://minipapers.com/https://minipapers.com/papers/preindustrial-ocean-circulation-alone-drives-over-half-of-mo-x5br50/https://minipapers.com/papers/preindustrial-ocean-circulation-alone-drives-over-half-of-mo-x5br50/In one climate model, the Southern Ocean's heat uptake under 4×CO2 is mostly set by the old circulation, with upwelling fixing its size and along-isopycnal diffusion fixing its slow decline.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/projected-2026-27-super-el-ni-o-could-raise-east-pacific-ext-x57z20/https://minipapers.com/papers/projected-2026-27-super-el-ni-o-could-raise-east-pacific-ext-x57z20/A preprint analysis finds that El Niño raises coastal extreme sea-level risk mostly by lifting background sea level along the eastern Pacific, and that the projected 2026–27 super event could make the old 99th-percentile high water a recurring event there.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/satellite-detected-oil-gas-methane-point-sources-emitted-7-6-x5hf8k/https://minipapers.com/papers/satellite-detected-oil-gas-methane-point-sources-emitted-7-6-x5hf8k/By modeling how often satellites miss small emissions, the authors estimate annual methane output for 1924 oil-gas point sources, finding higher persistence and higher emissions than earlier estimates.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/energy-imbalance-trends-since-2006-fit-climate-sensitivity-e-x5fn68/https://minipapers.com/papers/energy-imbalance-trends-since-2006-fit-climate-sensitivity-e-x5fn68/Satellite-era energy-budget trends point to high climate sensitivity if you take them at face value, but once uncertainty is included they fit the 2 to 5 K range from earlier assessments.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/hydrogen-aircraft-contrail-cirrus-forcing-is-modelled-as-66-acp-26-13485-2026/https://minipapers.com/papers/hydrogen-aircraft-contrail-cirrus-forcing-is-modelled-as-66-acp-26-13485-2026/In a model, hydrogen-powered aircraft make contrail cirrus with much less warming than jet fuel aircraft in most cases, but lubrication oil droplets could erase the benefit.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/ai-models-fed-predicted-ocean-temperatures-rival-a-physics-m-x5880n/https://minipapers.com/papers/ai-models-fed-predicted-ocean-temperatures-rival-a-physics-m-x5880n/AI atmosphere models driven by forecast ocean temperatures can match or beat a leading physics-based model for seasonal storm counts in the Atlantic and eastern Pacific, but not everywhere, and some of that skill may come from compensating errors.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/short-local-sea-salt-spraying-cooled-a-simulated-2019-northe-x5kv4t/https://minipapers.com/papers/short-local-sea-salt-spraying-cooled-a-simulated-2019-northe-x5kv4t/In a climate model, spraying sea salt aerosol over the Gulf of Alaska from May to September 2019 cooled the surface and eased the heatwave, with mostly local effects.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/uk-fine-particle-levels-fell-sharply-after-2019-mainly-from-x5vb91/https://minipapers.com/papers/uk-fine-particle-levels-fell-sharply-after-2019-mainly-from-x5vb91/The authors find that UK PM2.5 dropped quickly from 2019-2020 mainly because ammonium nitrate fell, as lower nitrogen oxide emissions across Europe cut the pollution arriving from the continent.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/record-el-ni-o-projected-to-push-global-temperatures-to-1-91-egusphere-2026-5348/https://minipapers.com/papers/record-el-ni-o-projected-to-push-global-temperatures-to-1-91-egusphere-2026-5348/A record-breaking 2026-2027 El Niño is projected to temporarily raise global temperatures to 1.91°C, with the event contributing roughly one-fifth of the peak warming while anthropogenic warming drives most of the rise.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/ecmwf-s-forecast-model-now-routes-rivers-and-floods-globally-egusphere-2026-4305/https://minipapers.com/papers/ecmwf-s-forecast-model-now-routes-rivers-and-floods-globally-egusphere-2026-4305/ECMWF has built the CaMa-Flood river model into its operational weather system, so it now produces global river discharge, water level and flood extent forecasts, and uses river flow to spot model errors.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/oregon-central-cascade-glaciers-lost-about-20-of-their-area-egusphere-2026-4076/https://minipapers.com/papers/oregon-central-cascade-glaciers-lost-about-20-of-their-area-egusphere-2026-4076/Glaciers on five Oregon volcanos are shrinking 4.5 to 6.1 times faster than before 2018/20, and the smallest glaciers are shrinking fastest, which the authors link to warmer summers.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/open-data-show-the-first-flood-wave-came-within-minutes-not-x56793/https://minipapers.com/papers/open-data-show-the-first-flood-wave-came-within-minutes-not-x56793/A preprint reconstructing the 26 August 2026 Langtang Lirung ice–rock avalanche finds the first flood wave reached the first gauge 12.8 min after the trigger, so it came from the debris flow and/or a rapid dam release, not the later lake overflow.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/repeated-satellite-looks-estimate-large-methane-emissions-pe-x5p79f/https://minipapers.com/papers/repeated-satellite-looks-estimate-large-methane-emissions-pe-x5p79f/Using repeated GHGSat detections and non-detections, the authors estimate yearly large-emitter methane for each Permian facility, totaling 1.70, 1.66 and 1.63 Mt y-1 for 2023 to 2025.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/a-13-km-machine-learning-weather-model-matches-icon-on-near-arxiv-2608-24651/https://minipapers.com/papers/a-13-km-machine-learning-weather-model-matches-icon-on-near-arxiv-2608-24651/AICON, a graph neural network trained on high-resolution ICON data without multi-step rollout, is now operational at DWD and competes with ICON near the surface, but it smooths fine scales and underestimates cyclone intensity.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/ground-based-lidars-show-daytime-low-cloud-cover-falling-at-x56j62/https://minipapers.com/papers/ground-based-lidars-show-daytime-low-cloud-cover-falling-at-x56j62/Independent ground lidar records from 16 land sites point the same way as satellite and reanalysis data: daytime low cloud cover has been declining, though the size of the decline differs between datasets.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/long-window-4d-var-with-neuralgcm-beats-20crv3-using-only-su-arxiv-2608-11515/https://minipapers.com/papers/long-window-4d-var-with-neuralgcm-beats-20crv3-using-only-su-arxiv-2608-11515/A differentiable weather model lets a simple long-window 4D-Var, with no background-error term, fit surface-pressure observations and give analyses closer to ERA5 than 20CRv3 over three months.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/slush-covers-far-more-of-greenland-s-ice-sheet-than-lakes-ch-tc-20-4345-2026/https://minipapers.com/papers/slush-covers-far-more-of-greenland-s-ice-sheet-than-lakes-ch-tc-20-4345-2026/A nine-year satellite map shows slush is the largest mapped surface meltwater feature on the Greenland Ice Sheet, growing and reaching higher in high-melt years.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/ocean-heat-transport-not-air-sea-flux-drives-regional-warmin-egusphere-2026-4643/https://minipapers.com/papers/ocean-heat-transport-not-air-sea-flux-drives-regional-warmin-egusphere-2026-4643/In the upper 200 m of the ocean, heat piles up where currents carry it, while air-sea heat exchange mostly acts as a regional brake.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/human-induced-warming-reached-1-37-c-in-2025-rising-0-27-c-p-essd-18-3889-2026/https://minipapers.com/papers/human-induced-warming-reached-1-37-c-in-2025-rising-0-27-c-p-essd-18-3889-2026/The fourth annual indicator update finds human-induced warming at 1.37 °C in 2025, rising at 0.27 °C per decade, with emissions at a record high but no longer growing rapidly.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/2024-saw-record-co2-growth-and-a-large-budget-gap-as-fossil-essd-18-3211-2026/https://minipapers.com/papers/2024-saw-record-co2-growth-and-a-large-budget-gap-as-fossil-essd-18-3211-2026/Fossil emissions hit a new high in 2024 and are projected to rise again in 2025, while 2024's record atmospheric CO2 growth left the carbon budget about 1.7 GtC out of balance.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/cmip7-proposes-seven-emission-scenarios-run-mostly-in-emissi-gmd-19-2627-2026/https://minipapers.com/papers/cmip7-proposes-seven-emission-scenarios-run-mostly-in-emissi-gmd-19-2627-2026/ScenarioMIP for CMIP7 sets out seven emission scenarios, from High to Very Low, to be run mostly with CO2 emissions driving the models, with some extended to 2500.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/realistic-particle-size-and-mixing-shift-black-carbon-radiat-acp-26-3107-2026/https://minipapers.com/papers/realistic-particle-size-and-mixing-shift-black-carbon-radiat-acp-26-3107-2026/In an industrial coal region of Shanxi, using the observed three-peak particle size and internal mixing, instead of simple standard assumptions, changes estimated absorption and radiative forcing by amounts comparable to local greenhouse gas forcing.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/multi-gpu-model-simulates-a-berlin-wide-flood-at-5-m-resolut-nhess-26-85-2026/https://minipapers.com/papers/multi-gpu-model-simulates-a-berlin-wide-flood-at-5-m-resolut-nhess-26-85-2026/With eight GPUs, the RIM2D flood model can simulate a 48-hour rainstorm over all of Berlin fast enough for early warning, at 10 m, 5 m and even 2 m resolution.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/swiss-glaciers-cushioned-the-2022-drought-but-total-meltwate-hess-30-23-2026/https://minipapers.com/papers/swiss-glaciers-cushioned-the-2022-drought-but-total-meltwate-hess-30-23-2026/In the 2022 drought, extra glacier melt offset water deficits in catchments with around 15 % glacier cover, yet shrinking glacier area meant total meltwater was already below the 2003 level in most catchments.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/tfa-in-swiss-rain-and-rivers-rose-four-to-six-times-since-th-acp-25-18157-2025/https://minipapers.com/papers/tfa-in-swiss-rain-and-rivers-rose-four-to-six-times-since-th-acp-25-18157-2025/Swiss rain and river TFA levels have climbed several-fold since 1996/1997, and simulated breakdown of known fluorinated gases explains only about 63 % of the TFA deposited on the Swiss Plateau.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/argo-floats-and-machine-learning-yield-gridded-southern-ocea-essd-17-7169-2025/https://minipapers.com/papers/argo-floats-and-machine-learning-yield-gridded-southern-ocea-essd-17-7169-2025/The authors used a neural network to turn Argo float temperature, salinity and sometimes oxygen into 1°×1° maps of Southern Ocean carbon chemistry, including anthropogenic carbon, with uncertainties.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/china-s-forest-biomass-density-rose-from-95-74-to-122-69-mg-essd-17-6993-2025/https://minipapers.com/papers/china-s-forest-biomass-density-rose-from-95-74-to-122-69-mg-essd-17-6993-2025/A 30 m annual map of China's forest biomass from 1985 to 2023 shows aboveground carbon stock rising from 5.50 to 13.97 PgC, mostly through growth of existing forest.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/new-global-methane-inventory-for-oil-gas-and-coal-totals-74-essd-17-7019-2025/https://minipapers.com/papers/new-global-methane-inventory-for-oil-gas-and-coal-totals-74-essd-17-7019-2025/GFEI v3 maps nationally reported 2020 fossil fuel methane emissions onto a 0.1° grid using new infrastructure and coal mine data, and it stays below other inventories and satellite-based estimates.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/iodine-129-and-uranium-236-track-atlantic-and-pacific-water-os-21-3311-2025/https://minipapers.com/papers/iodine-129-and-uranium-236-track-atlantic-and-pacific-water-os-21-3311-2025/Two radionuclide tracers show that in 2021 Pacific-influenced surface water met Atlantic-origin water at the Lomonosov Ridge, that this front moved from the Makarov Basin toward the ridge between 2011/2012 and 2015, and that Atlantic layer ages rose from 2015 to 2021 in several regions.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/open-sentinel-1-dataset-labels-oil-slicks-and-look-alikes-in-essd-17-6807-2025/https://minipapers.com/papers/open-sentinel-1-dataset-labels-oil-slicks-and-look-alikes-in-essd-17-6807-2025/The authors released a labeled set of radar image patches with 3225 oil objects and many look-alike scenes, so oil spill detectors can be tested on a common benchmark.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/dry-land-before-a-flash-drought-is-linked-to-stronger-heat-f-hess-29-6917-2025/https://minipapers.com/papers/dry-land-before-a-flash-drought-is-linked-to-stronger-heat-f-hess-29-6917-2025/Satellite data show that flash droughts starting from water-stressed land have stronger surface heating, and in parts of Africa low vegetation water content 1–2 months earlier goes with hotter peaks.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/weaker-shamal-winds-la-ni-a-and-negative-nao-drive-the-gulf-os-21-3241-2025/https://minipapers.com/papers/weaker-shamal-winds-la-ni-a-and-negative-nao-drive-the-gulf-os-21-3241-2025/Extreme summer sea temperatures in the Arabian Gulf come from weaker local winds and trapped moist air, and ENSO and the NAO together explain over 50 % of the year-to-year variation.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/lstm-beats-transformers-on-standard-hydrology-tasks-but-atte-hess-29-6811-2025/https://minipapers.com/papers/lstm-beats-transformers-on-standard-hydrology-tasks-but-atte-hess-29-6811-2025/In a benchmark of 11 Transformer-type models against an LSTM, the LSTM was best at regression and short forecasts, while attention-based models did better at long-horizon autoregression and zero-shot forecasting.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/open-global-dataset-maps-2-75-billion-buildings-with-heights-essd-17-6647-2025/https://minipapers.com/papers/open-global-dataset-maps-2-75-billion-buildings-with-heights-essd-17-6647-2025/Using only PlanetScope satellite images plus existing footprint data, the authors built the first complete global set of building outlines, 3 m height maps and simple 3D models, with height errors of 1.5 to 8.9 m by continent.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/ten-member-icon-ensemble-with-two-moment-ice-scheme-detects-acp-25-17253-2025/https://minipapers.com/papers/ten-member-icon-ensemble-with-two-moment-ice-scheme-detects-acp-25-17253-2025/Adding a two-moment ice scheme and a ten-member ensemble to the ICON model raises the share of ice-supersaturated regions detected from 0.4 to 0.6 for one run, and to 0.8 for a three-member vote.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/agage-data-show-2023-emissions-and-levels-of-42-trace-gases-essd-17-6557-2025/https://minipapers.com/papers/agage-data-show-2023-emissions-and-levels-of-42-trace-gases-essd-17-6557-2025/Using AGAGE station measurements and a simple 12-box atmosphere model, the authors publish yearly global emissions and abundances for 42 trace gases through 2023, and explain how they are derived and where they fall short.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/subpolar-north-atlantic-plankton-stay-smaller-even-after-co2-esd-16-2101-2025/https://minipapers.com/papers/subpolar-north-atlantic-plankton-stay-smaller-even-after-co2-esd-16-2101-2025/In a climate model, removing CO2 back to its starting level does not bring back large diatoms in the Subpolar North Atlantic, because weaker ocean circulation keeps surface nutrients low, and this cuts carbon export.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/agricultural-expansion-aggravates-water-shortage-more-than-c-hess-29-6373-2025/https://minipapers.com/papers/agricultural-expansion-aggravates-water-shortage-more-than-c-hess-29-6373-2025/Agricultural land expansion, not climate change, is the primary driver of intensifying water crises in arid regions.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/new-open-dataset-pairs-pre-event-optical-and-post-event-rada-essd-17-6217-2025/https://minipapers.com/papers/new-open-dataset-pairs-pre-event-optical-and-post-event-rada-essd-17-6217-2025/Bright is the first open, global dataset combining pre-disaster optical and post-disaster radar images of buildings, and models trained on it work well within known events but struggle on new ones.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/new-eaws-matrix-standardizes-avalanche-danger-assessment-acr-nhess-25-4503-2025/https://minipapers.com/papers/new-eaws-matrix-standardizes-avalanche-danger-assessment-acr-nhess-25-4503-2025/The EAWS Matrix is a decision-support tool developed by European avalanche forecasters that assigns danger levels by linking snowpack stability, how frequently it occurs, and expected avalanche size.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/saharan-dust-reached-monte-cimone-on-15-8-of-days-over-21-ye-acp-25-15453-2025/https://minipapers.com/papers/saharan-dust-reached-monte-cimone-on-15-8-of-days-over-21-ye-acp-25-15453-2025/Over 2003–2023, Saharan dust reached an Italian mountain station on about 58 days a year, with no trend, and longer summer events brought the largest coarse-particle rises.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/survey-of-481-water-managers-shows-reactive-drought-response-nhess-25-4475-2025/https://minipapers.com/papers/survey-of-481-water-managers-shows-reactive-drought-response-nhess-25-4475-2025/The 2022 drought showed that European water managers see rising drought risk but mostly respond with short-term, supply-side fixes, so the authors call for a binding European Drought Directive.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/polluted-subtropical-clouds-brighten-more-in-the-morning-and-acp-25-15329-2025/https://minipapers.com/papers/polluted-subtropical-clouds-brighten-more-in-the-morning-and-acp-25-15329-2025/In a six-day simulation of clouds drifting from Peru toward the equator, extra aerosol brightened clouds strongly in the morning but had almost no net effect in the afternoon.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/a-global-air-pollutant-emission-mosaic-now-covers-2000-2020-essd-17-5915-2025/https://minipapers.com/papers/a-global-air-pollutant-emission-mosaic-now-covers-2000-2020-essd-17-5915-2025/HTAP_v3.2 blends official regional emission inventories with the EDGAR global inventory into one monthly, gridded dataset for nine air pollutants over 2000–2020.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/satellite-data-show-dust-above-who-limits-in-most-of-81-larg-acp-25-14777-2025/https://minipapers.com/papers/satellite-data-show-dust-above-who-limits-in-most-of-81-larg-acp-25-14777-2025/Using 16 years of satellite lidar data, the authors find that dust in the lowest atmospheric layer exceeds WHO annual guidelines for fine particles in 87.7 % of 81 large cities, though dust is mostly declining.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/glider-and-swot-satellite-watch-a-smaller-eddy-merge-into-th-os-21-2763-2025/https://minipapers.com/papers/glider-and-swot-satellite-watch-a-smaller-eddy-merge-into-th-os-21-2763-2025/Combining a glider with SWOT altimetry, researchers saw a smaller, stronger eddy approach, co-rotate with and merge into the Lofoten Vortex in April 2023, spinning it up.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/rainfall-based-drought-index-is-the-top-predictor-of-hydrolo-nhess-25-4299-2025/https://minipapers.com/papers/rainfall-based-drought-index-is-the-top-predictor-of-hydrolo-nhess-25-4299-2025/An XGBoost model predicted next-month hydrological drought category correctly 79.9 % of the time in the Huaihe River Basin, and the precipitation drought index (SPI) mattered most, though it was weak on severe drought.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/satellite-data-show-global-methane-emissions-surged-in-2020-acp-25-14353-2025/https://minipapers.com/papers/satellite-data-show-global-methane-emissions-surged-in-2020-acp-25-14353-2025/Using TROPOMI satellite data, the authors estimate global methane emissions rose from 560 Tg a−1 in 2019 to 587–592 Tg a−1 in 2020–2021, with sub-Saharan African wetlands, especially in South Sudan, likely playing a major role.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/stand-alone-lstms-cannot-predict-river-flows-above-a-limit-s-hess-29-5871-2025/https://minipapers.com/papers/stand-alone-lstms-cannot-predict-river-flows-above-a-limit-s-hess-29-5871-2025/When fed extreme design rainfall, a stand-alone LSTM runoff model hits a ceiling well below flows it saw in training, and its runoff share falls as rain rises, while a hybrid model scales more sensibly.Sun, 04 Oct 2026 00:00:00 GMThttps://minipapers.com/papers/review-of-192-papers-finds-few-indicators-built-for-multi-ha-nhess-25-4263-2025/https://minipapers.com/papers/review-of-192-papers-finds-few-indicators-built-for-multi-ha-nhess-25-4263-2025/Many studies labelled multi-hazard simply layer separate single-hazard results, and few develop indicators that capture how hazards interact or how risks combine.Sun, 04 Oct 2026 00:00:00 GMT