A5011119665- Tree-ring climate responses
- Climate variability and models
- Geology and Paleoclimatology Research
- Plant Water Relations and Carbon Dynamics
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Groundwater and Isotope Geochemistry
- Oceanographic and Atmospheric Processes
- Meteorological Phenomena and Simulations
- Coral and Marine Ecosystems Studies
- Forest ecology and management
- Pulsars and Gravitational Waves Research
- Tropical and Extratropical Cyclones Research
- Cryospheric studies and observations
- Atmospheric and Environmental Gas Dynamics
- Gamma-ray bursts and supernovae
- Geological and Geophysical Studies
- Ecology and Vegetation Dynamics Studies
- Geophysics and Sensor Technology
- Marine and fisheries research
- Geological formations and processes
- Ocean Acidification Effects and Responses
- Environmental and Cultural Studies in Latin America and Beyond
- Calibration and Measurement Techniques
- Hydrocarbon exploration and reservoir analysis
University of Maryland, College Park
2015-2024
Earth System Science Interdisciplinary Center
2014-2024
Lamont-Doherty Earth Observatory
1997-2024
Columbia University
1920-2024
George Mason University
2023
Massachusetts Institute of Technology
2005-2023
Oeschger Centre for Climate Change Research
2021-2022
University of Bern
2021-2022
Roslin Institute
2022
University of Edinburgh
2022
Surface winds and surface ocean hydrography in the subpolar North Atlantic appear to have been influenced by variations solar output through entire Holocene. The evidence comes from a close correlation between inferred changes production rates of cosmogenic nuclides carbon-14 beryllium-10 centennial millennial time scale proxies drift ice measured deep-sea sediment cores. A forcing mechanism therefore may underlie at least Holocene segment Atlantic's "1500-year" cycle. hydrographic affected...
Abstract Reproducible climate reconstructions of the Common Era (1 CE to present) are key placing industrial-era warming into context natural climatic variability. Here we present a community-sourced database temperature-sensitive proxy records from PAGES2k initiative. The gathers 692 648 locations, including all continental regions and major ocean basins. trees, ice, sediment, corals, speleothems, documentary evidence, other archives. They range in length 50 2000 years, with median 547...
The Laser Interferometer Gravitational Wave Observatory (LIGO) consists of two widely separated 4 km laser interferometers designed to detect gravitational waves from distant astrophysical sources in the frequency range 10 Hz kHz. first observation run Advanced LIGO detectors started September 2015 and ended January 2016. A strain sensitivity better than $10^{-23}/\sqrt{\text{Hz}}$ was achieved around 100 Hz. Understanding both fundamental technical noise critical for increasing observable...
A proxy system model may be defined as the complete set of forward and mechanistic processes by which response a sensor to environmental forcing is recorded subsequently observed in material archive. Proxy modeling complements sharpens signal interpretations based solely on statistical analyses transformations; provides basis for observing network optimization, hypothesis testing, data-model comparisons uncertainty estimation; incorporated weak but mechanistically-plausible constraints into...
Abstract. The pre-industrial millennium is among the periods selected by Paleoclimate Model Intercomparison Project (PMIP) for experiments contributing to sixth phase of Coupled (CMIP6) and fourth PMIP (PMIP4). past1000 transient simulations serve investigate response (mainly) natural forcing under background conditions not too different from today, discriminate between forced internally generated variability on interannual centennial timescales. This paper describes motivation experimental...
Abstract Most annually resolved climate reconstructions of the Common Era are based on terrestrial data, making it a challenge to independently assess how recent changes have affected oceans. Here as part Past Global Changes Ocean2K project, we present four regionally calibrated and validated sea surface temperatures in tropics, 57 published publicly archived marine paleoclimate data sets derived exclusively from tropical coral archives. Validation exercises suggest that our interpretable...
Climate in the tropical North Atlantic is controlled largely by variations strength of trade winds, position Intertropical Convergence Zone, and sea surface temperatures. A high-resolution study Caribbean sediments provides a subdecadally resolved record upwelling wind variability spanning past 825 years. These results confirm importance decadal (12- to 13-year) mode believed be driven coupled ocean-atmosphere dynamics. Although well-defined interdecadal does not appear characteristic...
Abstract In this study we compare three newly developed independent NINO3.4 sea surface temperature (SST) reconstructions using data from (1) the central Pacific (corals), (2) TexMex region of USA (tree rings) and (3) other regions in Tropics (corals an ice core) which are teleconnected with SSTs 20th century. Although these strongly calibrated well verified, inter‐proxy comparison shows a significant weakening coherence 19th This breakdown common signal could be related to insufficient...
Abstract Paleoclimate observations constitute the only constraint on climate behavior prior to instrumental era. However, such provide indirect (proxy) constraints physical variables. Proxy system models aim improve interpretation of and better quantify their inherent uncertainties. existing are currently scattered in literature, making integration difficult. Here, we present a comprehensive modeling framework for proxy systems, named PRYSM . For this initial iteration, focus water‐isotope...
The South Asian Monsoon and mid-latitude Westerlies are two important controls on Tibetan Plateau (TP) fresh water resources. Understanding their interaction requires long-term information spatial patterns in moisture variability the TP. Here we develop a network of 23 moisture-sensitive tree-ring chronologies from major juniper forests north-south transect eastern Over past five half centuries, find that these cluster into groups, North South, ∼33° N. Southern northern regional chronology...
Abstract. Estimated external radiative forcings, model results, and proxy-based climate reconstructions have been used over the past several decades to improve our understanding of mechanisms underlying observed variability change millennium. Here, recent set temperature at continental-scale generated by PAGES 2k project a collection state-of-the-art simulations driven realistic forcings are jointly analysed. The first aim is estimate consistency between results for each region time...
[1] The response of the tropical Pacific Ocean to future climate change remains highly uncertain, in part because disagreement among observations and coupled general circulation models (CGCMs) regarding 20th-century trends. Here we use forward proxies compare CGCM simulations proxy address trends assess remaining uncertainties both models. We model coral oxygen isotopic composition (δ 18O) a 23-site Indo-Pacific network as linear function sea-surface temperature (SST) salinity (SSS) obtained...
A systematic methodology for the reconstruction of climate fields from sparse observational networks proxy data, employing technique reduced space objective analysis, is applied to gridded Pacific Ocean Basin sea surface temperature (SST) coral stable isotope (δ 18 O) data period 1607–1990. In this approach we seek reconstruct only leading modes large‐scale variability which are both observed in modern and resolved data. We find that verifiably resolve two spatial patterns SST variability....
We investigate the interpretation of tree‐ring data using Vaganov‐Shashkin forward model formation. This is derived from principles conifer wood growth, and explicitly incorporates a nonlinear daily timescale multivariate environmental controls on growth. The results are shown to be robust with respect primary moisture temperature parameter choices. When applied simulation widths North America Russia Mann et al. (1998) Vaganov (2006) sets, produces skill annual decadal timescales which about...
We use a mechanistic model of tree‐ring formation to simulate regional patterns climate‐tree growth relationships in the southeastern United States. Modeled chronologies are consistent with actual data, demonstrating that our simulations have skill reproducing broad‐scale proxy's response climate variability. The predicts decrease summer precipitation, associated weakening Bermuda High, has become an additional control on tree ring during recent decades. A nonlinear variability implications...