https://www.alawman.info/research-projects daily 0.75 2025-09-12 https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1610051715271-8SYBTDNWG8HVCVLFDISY/Lawman_PAGES_Magazine_Fig2.png Research Correlation between Niño 3.4 SST anomalies (SSTA) and values at each grid point. Monthly Niño 3.4 SSTA correlated with monthly (A) SSTA and (B) δ18O generated using the sensor model of Thompson et al. (2011). The 20‐year running SD of Niño 3.4 SSTA (i.e. decadal+ changes in ENSO variability) correlated with (C) SST and (D) pseudocoral δ18O anomalies. The 20‐year running SD of Niño 3.4 SSTA correlated with (E) SSTSr/Ca and (F) pseudocoral δ18O anomalies perturbed by the three coral PSM sub-models. Statistically significant correlations (p<0.01) are stippled. The gold diamond (C-F) indicates the average correlation coefficient for the Niño 3.4 region (white box). Figure from Lawman et al. (2020). https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1580743208688-03L5LJCCG4F0U8ALBTEJ/Fig5_Final.png Research Top. Southwest Pacfiic coral Sr/Ca-SST reconstructions for two Medieval Climate Anomaly fossil corals (11-TM-S5: green; 11-TM-I1: gray). The corals have ~24 years of overlap. Triangles indicate the 230Th ages ± 2σ analytical error. Bottom. Climatology-removed Sr-Ca-SST anomalies for 11-TM-S5. The anomalies are 9-year high-pass filtered to isolate ENSO variability at internal (>1 - 9 yr) timescales. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/ace4e31f-6ca4-49c1-b213-4cd53ab0f2e4/Fig2_Nino34_Holocene_ENSO_CESM1.png Research CESM1 simulated changes in Holocene ENSO variability. (A) The 30-year running SD of Niño 3.4 monthly SSTA for 9, 6, 3, and 0 ka. Lower and upper bounds of the boxes respectively correspond to the 25th and 75th percentiles, and the center line indicates the median (50th percentile). Whiskers represent the 1.5 × interquartile range, and outliers are indicated with a black dot. The range of the box and whiskers (Fig. 2A) captures intervals with higher and lower ENSO variability that arise purely from internal variability within the simulated climate system of each time interval. (B) Probability density functions (PDFs) of Niño 3.4 monthly SSTA for the Holocene time slices (see legend for labels). (C and D) Scatter plot of SD versus the number of extreme El Niño events in (C) 100-year and (D) 30-year windows. Extreme El Niño events are defined when the November-December-January (NDJ) average SSTA exceeds the 95th percentile (p95) of monthly SSTA for that time interval. Solid symbols in (C) indicate the average number of events/century for the full-length time slice simulations. Open symbols in (C) and (D) represent individual nonoverlapping windows. In this and all subsequent figures, the reported monthly anomalies are 9-year high-pass filtered, climatology-removed, and 5-month running mean anomalies to isolate interannual variability and facilitate comparison with coral proxy data. (From Fig. 2 in Lawman et al. (2022)). https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541974892516-N2L2IR1W66BHOZ4EP9FD/IMG_4114+11-TM-S.JPG Research Drilling an in situ fossil coral head at Tasmaloum, Vanuatu (15.9°S, 166.9°E). The core extracted from this coral head is used to reconstruct climate variability during the Medieval Climate Anomaly (950-1250 CE). Photo courtesy of Jud Partin & Fred Taylor. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/79e231e5-44e0-4048-8acf-46d6668d9525/lobedstarcolonyelh.jpg Research Coral colony from the Flower Garden Banks National Marine Sanctuary. (Image Credit: NOAA) https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1540976510968-7UZ4UW8OZEUF257CO427/IMG_3980.jpg Research https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/dee8591d-40e1-4c78-9ef0-d8141cb666eb/fig1-proxy-model.001.jpeg Research Tropical rainfall changes in response to a weakened AMOC. (a) 154 hydroclimate-sensitive paleoclimate proxy records (symbols) indicating wetter (blue), drier (brown),or unchanged (white) conditions during HS1 compared to a LGM/deglacial reference interval. The shape of the symbol indicates terrestrial isotope(triangle), marine isotope (circle), aridity (square), and vegetation (diamond) proxy records. Colored shading indicate the ensemble mean annual rainfall change (mm/day) for the 5 simulations that have the highest global model-data agreement. (b) Agreement between the simulated and proxy-inferred patterns of rainfall change based on the Cohen’s statistic (Cohen, 1960). Cohen’s for each simulation shown as a function of thedrier/wetter threshold (0%–60%). Black outlines indicate statistically significant values (p < 0.05). The highest for each simulation is listed in (Table 1). The simulations are grouped based on the tropical North Atlantic temperature change. Simulations with an average temperature change less than −1°C are classified as the ‘‘strong and moderate cooling’’ group, while those with changes greater than −1°C fall into the ‘‘muted cooling’’ group. The ensemble mean for each grouping is alsoprovided. Black dots next to the model names indicate the simulations used in (a). (c) The number of simulations with the same sign as the 18-member ensemble mean rainfallresponse. Globally, the proxy-inferred patterns of hydroclimate change during HS1 best agree with the simulations with strong and moderate cooling of the tropical North Atlantic. Figure from Lawman et al. (2025). https://www.alawman.info/analytical-laboratory-for-paleoclimate-studies daily 0.75 2025-08-11 https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541381984299-6WCE3UJT6MIJSYDTNNMF/0329161523.jpg Lab https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541381819961-MS4ZZ8ZAMRRACQSWS7X0/1209160956.jpg Lab https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541382589567-42753GFPGAK7T92HCVDS/IMG_20181101_153417.jpg Lab https://www.alawman.info/home daily 1.0 2024-02-06 https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/8b001235-4095-4a1c-bccd-f0eb58a4814c/20230419_151648.jpg Home - About I am an Assistant Professor of Environmental Science at Colorado College. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541383040976-F53CY9A30BF7VBI64FO2/WebsiteHomeBanner.png Home https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541286289648-YQHLIO2PIROU8C4ZT1GQ/UNADJUSTEDNONRAW_thumb_93.jpg Home - LAB Find out about the types of geochemical analyses I use to study climate. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1540983983452-OFMX01Q2G1ZJG7EDBLHV/IMG_4064.png Home - ResearcH Learn about my research questions & projects. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/7dd3c483-0834-4dd6-8da9-4def3dd5fb2b/PXL_20231027_161217213.jpg Home - Teaching Find out about my teaching and courses. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1547086448003-TPLO3WQ9H5AGXL1FEFAW/MGG_Thu-5066.jpg Home - Fieldwork Learn about my experiences in the field. https://www.alawman.info/field-work daily 0.75 2025-08-11 https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541971457638-WMU3HN6YPEZ7CEY3ZWNQ/IMG_0801.JPG Fieldwork Potential target location for recovering coral material of Last Glacial Maximum and deglacial ages https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541252516868-M9USJ0IVU3DFJMEOWXMW/UNADJUSTEDNONRAW_thumb_2ec.jpg Fieldwork Deploying the sediment trap aboard the R/V Point Sur. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541252367252-2ZH4ECBJOP6799RF5754/DSCN1906.JPG Fieldwork R/V Point Sur. This vessel is owned by the University of Southern Mississippi and has a cooperative agreement between the University of Southern Mississippi and the Louisiana Universities Marine Consortium. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541000688311-UXF6HJU6D4A39G79UYSG/2017_MGG_Tu-4927.jpg Fieldwork My research team deploying the CHIRP offshore of Galveston, TX https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541971380427-LZYO295EQWPXODXI4H64/IMG_0806.JPG Fieldwork 14.2 ka Diploastrea coral located above present day sea level (near Tanavusvus, Vanuatu, SW Pacific) https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1541000393031-3NWN1JE0FG9MQC2PAPSS/MGG_Fri-5169.jpg Fieldwork The 2017 Marine Geology & Geophysics Field Course students and instructors aboard the NOAA vessel used for the week’s field work (Galveston, TX) https://www.alawman.info/background daily 0.75 2025-09-12 https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/f77e3200-627b-4394-85b2-6bc06a500015/Lawman.Allison.jpg About https://www.alawman.info/publications daily 0.75 2025-09-12 https://www.alawman.info/highlights daily 0.75 2024-04-11 https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/92ce9278-e230-4175-9f7c-963d6b693cbd/lobedstarcolonyelh.jpg Research Highlights - EOS Science News by AGU Research SPotlight Unchecked Ocean Warming Threatens Many Gulf and Caribbean Corals https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/9da3ec68-3124-4204-bca6-333d8dc2d31f/ElNino-noaa-1536x768.png Research Highlights - Press Releases & News Articles FOR: Unraveling Forced Responses of Extreme El Niño Variability over the Holocene (Lawman et al., 2022, Sci. Adv.) https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1599060241463-3TREAS41WVFV9E0LN4KM/El-NinoRisingTitle.jpg Research Highlights - Texas Geosciences Research Feature El Niño/La Niña Rising https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1621265734969-KY8I3TTZMXY1QCZLP9EC/Lawman_PAGES_Magazine_Fig2.png Research Highlights - PAGES - Past Global Changes Magazine Archives of the El Niño-Southern Oscillation: A Coral Point of View https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/de766422-2334-40b8-8c9a-52084a166521/PXL_20230911_171924644.jpg Research Highlights - The Peak-Colorado College Environmental Studies and Science Program Shares Passion for the Climate https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/ab711af3-1ae9-4669-bc3c-603abf253daa/Figure1_FossilCoral_Vanuatu.JPG Research Highlights - NCAR Climate Data Guide Expert User Guidance Coral geochemical records: An overview of their use as climate proxies and of available databases https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/1599059288590-5X83UQYE9K8VJHM1HH59/shallow-corals-american-samoa-usgs-800x600.jpg Research Highlights - EOS Science News By AGU Research Spotlight Corals Make Reliable Recorders of El Niño Fluctuations https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/dd4ae4e1-cb30-4e11-90b7-b1074b4233c8/Screenshot+2024-02-04+at+7.21.46+PM.png Research Highlights - Science News Article The Coral Chronicles Story about coral fieldwork in Vanuatu by Paul Voosen, Science news writer https://www.alawman.info/teaching daily 0.75 2025-09-12 https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/de766422-2334-40b8-8c9a-52084a166521/PXL_20230911_171924644.jpg Teaching - Make it stand out EV128 field trip to the National Center for Atmospheric Research in Boulder. https://images.squarespace-cdn.com/content/v1/5bd8800494d71a5b19ee2741/92abc01c-2bb7-4525-ac10-8c9ec1bf82e6/PXL_20231027_163549630.jpg Teaching - Make it stand out EV333 students measuring temperature, dew point, relative humidity, and wind speed on Pikes Peak. https://www.alawman.info/home-alt-bedford daily 0.75 2025-05-06 https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390500612440-PGQSIY8KL9F7T5VIXQLO/chambers-2.jpg Home Alt A better world Starts with a choice Contact Us https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390500503574-5BAPXZO9U06UV61P49UO/chambers1.jpg Home Alt Sustainability Starts with you Join Us https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390500933384-LII4SRIPHFYOUFX0UCXC/chambers-4.jpg Home Alt A better world Starts with a choice Join Us https://images.squarespace-cdn.com/content/v1/52a74d9ae4b0253945d2aee9/1390504287124-HQ8GNX1JCE22V047MSQ9/chambers-8.jpg Home Alt Preserve Nature Join Us