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41 results for “tipping point”
Thresholds and Tipping Points in a Sarracenia Microecosystem at Harvard Forest 2012-2013
The primary goal of this project is to determine experimentally the amount of lead time required to prevent a state change. To achieve this goal, we will (1) experimentally induce state changes in a natural aquatic ecosystem - the Sarracenia microecosystem; (2) use proteomic analysis to identify potential indicators of states and state changes; and (3) test whether we can forestall state changes by experimentally intervening in the system. This work uses state-of-the art molecular tools to identify early warning indicators in the field of aerobic to anaerobic state changes driven by nutrient enrichment in an aquatic ecosystem. The study tests two general hypotheses: (1) proteomic biomarkers can function as reliable indicators of impending state changes and may give early warning before increasing variances and statistical flickering of monitored variables; and (2) well-timed intervention based on proteomic biomarkers can avert future state changes in ecological systems.
Correlated order at the tipping point in the kagome metal CsV3Sb5
<p>Data deposite for the manuscript entitled "Correlated order at the tipping point in the kagome metal CsV3Sb5". The manuscript will soon appear online. </p>
Global forest cover loss tipping points leading to changing hydrologic responses
<p>This dataset describes the methods used to develop the results for study entitled: Global forest cover loss tipping points leading to changing hydrologic responses.</p> <p>EVENTS_List_45.docx is a table describing each deforestation event used for the study</p> <p>MATLAB Script 1: Plotting Hydrologic Sensitive Area against Tree cover loss every 10 % tree cover loss for all 45 events and adjusting Richard's curve function to obtain the parameters. This script uses EXCEL SHEET: HSiaresults.xlsx</p> <p>MATLAB Script 2: Computing the critical points of acceleration based on the Richards curve parameters. This script uses the parameters or results obtained in Script one.</p> <p>MATLAB Script 3: Plotting the climate and water yield direction against tree cover loss. This script used EXCEL SHEET: direction.xlsx</p>
WP3-CT2 Alpine Glaciers Disappearance Tipping Point
<p>Glaciers Length changes starting from small, medium, and large glaciers.</p>
Icons of the tipping points in the Earth System from the H2020 COMFORT project (820989)
<p>Triple threat processes and/or other forcings can lead to changes in the ocean happening fast and abruptly. These changes, referred to as “tipping points”, are critical thresholds in a marine system that, when exceeded, can lead to a significant change in the state of the system, which often can be irreversible. This product has been prepared with the financial support of Norges forskningsråd (Research Council of Norway) (309382) and the European Union’s Horizon 2020 research and innovation programme under grant agreement No 820989 (project COMFORT, Our common future ocean in the Earth system – quantifying coupled cycles of carbon, oxygen, and nutrients for determining and achieving safe operating spaces with respect to tipping points). The work reflects only the author’s/authors’ view; the European Commission and their executive agency are not responsible for any use that may be made of the information the work contains.</p>
Text-fig. 2. Eospondylus primigenius (STÜRTZ) Bundenbach, Eschenbach-Bocksberg quarry, Lower Devonian, Lower Emsian (Zlichovian), Hunsrück Slate,, NM S 4764, x 3. Specimen with ventral arm coiling. The specimen is on its dorsum in slate with all five rays curled ventrally inward toward mouth area on underside of disk. Barely visible are tips of two jaws; slightly exposed are proximal parts of rays in oral view extending outward from disk. The location of abrupt ventral bending of rays is indicated by emergence from slate of five rays in aboral view that point inward toward buried disk. Based on ventral bending of rays and intimate association with crinoids Eospondylus has been interpreted as stratigraphic first occurrence of Order Euryalida, which contains epizoic gorgonocephalid and euryalid basket-stars of modern oceans. This status is rejected using new evidence from isolated vertebrae. [Photo by Alexander Glass]. in Isolated Ossicles Of The Family Eospondylidae Spencer Wright, 1966, In The Lower Devonian Of Bohemia (Czech Republic) And Correction Of The Systematic Position Of Eospondylid Brittlestars (Echinodermata: Ophiuroidea: Oegophiurida)
Text-fig. 2. Eospondylus primigenius (STÜRTZ) Bundenbach, Eschenbach-Bocksberg quarry, Lower Devonian, Lower Emsian (Zlichovian), Hunsrück Slate,, NM S 4764, x 3. Specimen with ventral arm coiling. The specimen is on its dorsum in slate with all five rays curled ventrally inward toward mouth area on underside of disk. Barely visible are tips of two jaws; slightly exposed are proximal parts of rays in oral view extending outward from disk. The location of abrupt ventral bending of rays is indicated by emergence from slate of five rays in aboral view that point inward toward buried disk. Based on ventral bending of rays and intimate association with crinoids Eospondylus has been interpreted as stratigraphic first occurrence of Order Euryalida, which contains epizoic gorgonocephalid and euryalid basket-stars of modern oceans. This status is rejected using new evidence from isolated vertebrae. [Photo by Alexander Glass].
Astroclimate measurements on several points over Eastern hemisphere in 2-mm and 3-millimeter atmospheric transparency windows using tipping radiometer
<p>We are presenting results of the atmospheric propagation observations which our research group has been conducting since 2012. Over this time, we have gathered statistical data of atmospheric propagation over a number of sites which possibly can be used for radio astronomical observations in the millimetre and sub-millimetre bandwidths. The Zenith opacity was studied by the atmospheric dip method in the 3 mm and 2 mm atmospheric windows. The dataset is recommended to use for estimation of atmospheric propagation for the purpose of radio astronomy and telecommunications.</p> <p>The “tau-meter” (named MIAP-2) allows us to estimate an integral absorption by using the atmospheric dip method. The hardware includes a radiometric system comprising two self-contained radiometers operating in two different bands of 84-99 GHz (λ ~ 3 mm) and 132-148 GHz (λ ~ 2 mm), a rotary support, a control, and a firmware system. The radiometers work in modulation mode within 36 Hz modulation frequency. Floating mirror allows radiometer to scan the sky in the interval of 0 – 88.5 elevation angles (6 total). The output record contains the voltages of synchronous detector for each angle in 2 wavebands. The voltage is proportional to brightness temperature of the sky in corresponding waveband. (It has negative value for technical reasons.)</p> <p>The dataset contains raw data observed by radiometer: Local date and time, a several detector voltages on different elevation angles for 2 wavebands, as well as service information header. The first 6 columns contain optical depth calculated by old method and it’s no more used in data processing since the new algorithm has been invented in 2018.</p>
Water Supply Tipping Point Data and Code
<p>This publication provides code, WaterSupplyTippingPoints.R, to calculate tipping points in water supply by using a time series of deficit data. The code uses data files that are produced from an agent-based model that simulates water supply dynamics. The code uses deficit data to calculate a water supply performance metric, Sustainability Index, and implements a decision tree change point detection method detects change points. The code implements a tipping point rule that is applied to select a change point as a tipping point. Data files of deficits that are used as input are described and published at https://zenodo.org/record/3971213.</p> <p>The code can be executed for four management scenarios and 16 shifting climate scenarios. Management Strategy 1 is no management. Management Strategy 2 is retrofitting. Management Strategy 3 is retrofitting with reactive drought restrictions. Management Strategy 4 is retrofitting with proactive drought restrictions. The 16 shifting climate scenarios correspond to shifting factors equal to 0.25 - 1.0, increasing in 0.05 increments. For each of the 64 modeling scenarios (16 climate settings X 4 management strategies), 100 simulations were run to capture stochasticity.</p> <p>The output from the code are provided in a set of .csv files, attached here. Data files (TippingPoints-mgmt1.csv, TippingPoints-mgmt2.csv, TippingPoints-mgmt3.csv, TippingPoints-mgmt4.csv) list the 100 tipping points that were identified for each shifting factor and each management strategy. Columns (V1, V2, ... V100) are 100 unique and randomized simulations for each modeling scenario. Rows correspond to shifting factors, where Row 1 is shifting factor 0.25, and Row 16 is shifting factor 1.00.</p>
Extreme Climate Risks and Financial Tipping Points
<p>This repository contains the data and the source code for the simulations and figures of the article.</p> <p><strong>Abstract</strong></p> <p>Designing climate change policies requires considering the feedback loops between mitigation and adaptation, since more mitigation efforts today will trigger lower adaptation costs. In this framework, carbon taxes are often seen as promising tools but at the risk of financially overburdening the private sector, depriving it of important economic resources. However, analyzing the financial feasibility of mitigation-adaptation policies using conventional Integrated Assessment Models (IAM) is limited, as they do not simultaneously endogenize economic growth, emissions, and damages.</p> <p>Here, we present IDEE (Integrated Dynamic Environment-Economic), a new IAM based on the coupling of an Earth Model of Intermediate Complexity and a non-linear macroeconomic model in continuous time. Then, we analyze the simultaneous effects of carbon taxes and public spending, both on climate and on the world economy. We show that, above a warming about +2.3°C, damages drastically foster the need for additional investments in productive capital—an adaptation necessity—that potentially leads private firms to a debt overhang and a worldwide cascade of defaults. This suggests that the Paris Agreement target should not only be motivated by the climatic non-linearities and tipping points arising beyond the +2°C threshold, but also by the emergence of financial tipping points. We also show that, provided public subsidies are high enough, a tax of usd 300 per tCO<sub>2</sub>e by 2030 enables reaching net-zero emissions in 2050, preventing firms from suffering global bankruptcy.</p> <p>We anticipate IDEE to be a starting point for a new class of IAMs that better represent the reciprocal feedback loops between the environment and the economy.</p>
Replication data for: Effect of Regional Marine Cloud Brightening Interventions on Climate Tipping Points
<p>Data for reproduction of Hirasawa, H., Hingmire, D., Singh, H., Rasch, P. J., & Mitra, P. (2023). Effect of regional marine cloud brightening interventions on climate tipping elements. Geophysical Research Letters, 50, e2023GL104314. https://doi.org/10.1029/2023GL104314</p> <p>Includes:</p> <ul> <li>Raw monthly 2m temperature (TREFHT) and precipitation (PRECT) data from CESM2 MCB simulations.</li> <li>Ensemble mean data from CESM2 Large Ensemble</li> <li>Tipping point metric timeseries from CESM2 LE Historical and SSP2-4.5 and CESM2 MCB simulations.</li> <li>Jupyter notebook displaying plotting script</li> <li>Scripts showing procedure for computing tipping point metrics</li> <li>CAM6 SourceMod changes to apply cloud droplet number concentration perturbations</li> <li>Top of atmosphere long and shortwave anomalies from fixed sea surface temperature simulations for computing effective radiative forcing</li> </ul>
Approaching a thermal tipping point in the Eurasian boreal forest at its southern margin
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MA in ventral view sharply pointed at tip (Q1) in An of Zelotibia (Araneae, Gnaphosidae), a spider genus with a species swarm in the Albertine Rift
MA in ventral view sharply pointed at tip (Q1)
Circum-Antarctic data used in "Tipping point behaviour of ice-sheet grounding-zone melting due to ocean water intrusion" by Bradley and Hewitt
<p>The file 'Antarctica-data.mat' contains the following fields:</p><p>'x' [units: m] x position of grid points</p><p>'y' [units m] y position of grid points</p><p>'tf_max' [units: C] maximum thermal forcing from Adusumilli et al. 2020 (doi: https://doi.org/10.1038/s41561-020-0616-z)</p><p>'H' [units: m] ice thickness from Bedmachine V3</p><p>'B' [units: m] bed elevation from Bedmachine V3</p><p>'mask' [units: n/a] Bedmachine V3 mask</p><p>'isedge' [units: n/a] Logical array with 1 corresponding to edges of ice shelves and 0 otherwise</p><p>'isgl' [units: n/a] Logical array with 1 corresponding to grounding line points and 0 otherwise</p><p>'isfront' [units: n/a] Logical array with 1 corresponding to ice fronts and 0 otherwise</p><p>'vx' [units: m/a] Ice velocity in the x-direction from ITS_LIVE 240m mosaic</p><p>'vy' [units: m/a] Ice velocity in the y-direction from ITS_LIVE 240m mosaic</p>
Missing the (tipping) point: the effect of information about climate tipping points on public risk perceptions in Norway [Dataset]
<p>This is all the data used for the redaction of the research paper "Missing the (tipping) point: the effect of information about climate tipping points on public risk perceptions in Norway".</p> <p> </p> <p>The dataset is contained in Excel files (.xlsx) and code for statistical analysis can be found in R files (.R)</p>
Data for: Climate driven tipping points in the trophic status of northern lakes.
<p>These data were generated to investigate resilience of northern lakes to climate change. Chlorophyll a concentrations in 12,644 temperate lakes in Ontario, Canada were modelled using remote sensing (see Paltsev, A., & Creed, I. F. (2021) Are northern lakes in relatively intact temperate forests showing signs of increasing phytoplankton biomass? <i>Ecosystems</i>. https://doi.org/10.1007/s1002 1-021-00684-y.) and then analysed using spectral methods. </p>
Data from: How climate extremes—not means—define a species' geographic range boundary via a demographic tipping point
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Izembek Point Tip XCB-003-230
Izembek Point Tip XCB-003-230 XCB-003, or IZM-003, is a site tested by A.P. McCartney in 1971. It is the type-site for the Izembek Phase. A small village with a unique whalebone house and many artifacts similar to those in the Bristol Bay region. It dates approximately 1200-1350 CE. The Alaska Peninsula artifacts are presented as a result of the research conducted under grants NSF 9630072, NSF 9814086, NSF 9996372, NSF 9996415, NSF 1139266, NSF 1321411. H. Maschner, Principal Investigator. These artifacts were scanned with either a Faro Edge Arm or a Minolta Vivid 9i. Processed in Geomagic or Polyworks. 2-8 photos were used for texture in Geomagic Wrap. Original digitizing work done at the IVL at Id. St. Univ. Subsequent processing and publication completed at Global Digital Heritage. 1. McCartney, A.P. 1974 Prehistoric Cultural Integration along the Alaska Peninsula. APUA 16(1):59-84. 2. Maschner: doi: 10.1353/arc.2011.0007 Arctic Anthro. January 1, 2004 vol. 41 no. 2 98-111. Source: Objaverse 1.0 / Sketchfab
Data for the "Deforestation could push Amazonia close to a tipping point under future climate change." paper
<p>Matlab datafiles for the output of the HYBRID-ICBL <span>coupled land surface-atmosphere single column model presented in the "Deforestation could push Amazonia close to a tipping point under future climate change"</span></p> <p><span>Values are daily mean values and their names are self explanatory as follows.</span></p>
Tipping points and multiple drivers in changing aquatic ecosystems: A review of experimental studies (Data)
<p>The ecological concepts of tipping points and multiple stressors are both important concepts for the management of natural ecosystems. However, very few studies have attempted to combined both concepts and evaluate tipping points in the context of multiple stressors. The data available here have been published in a literature review (Limnology & Oceanography). In this review we (1) develop a historical and current perspective of tipping point studies in terrestrial, freshwater and marine ecological systems; (2) portray the research effort in different freshwater and marine habitats; and (3) explore the results of experimental studies focusing on tipping points measured at the individual, communities, ecosystem level, as well as ecosystem functions and services in a context of single and multiples stressors.</p>
Antarctic Tipping points triggered by the mid-Pliocene warm climate
<p>Simulated Antarctic mPWP at 16 km resolution files for every AOGCM. </p> <p><strong>enh:</strong> enhancement factor</p> <p><strong>btq: </strong>friction exponent</p> <p><strong>cfrf: </strong>friction coefficient</p>
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