• Centennial response of Greenland’s three largest outlet glaciers

    Jan. 5, 2021

    David Holland and colleagues have used historical photographs to extend the climate record of ice loss in Greenland back beyond the modern satellite era to almost a century and a half ago. The study significantly improves the temporal resolution of ice loss during that period showing a complex multi decadal pattern of increased and lessened loss rates. Read More

  • Heat and carbon coupling reveals ocean warming due to circulation changes

    Sept. 23, 2020

    Laure Zanna and Ben Bronselaer developed a new method to analyze the global uptake of heat and carbon in the ocean. Their results show that ocean warming patterns will increasingly be influenced by simple uptake of atmospheric warming, making them easier to predict. This is in contrast to the past 60 years, over which time circulation changes have been viewed as key factors in shaping ocean warming patterns. Read More

  • Statistical forecasting of the El Nino Southern Oscillation

    Feb. 25, 2020

    CAOS researchers Xinyang Wang and Dimitris Giannakis in collaboration with Joanna Slawinska of University of Wisconsin-Milwaukee have developed a data-driven technique for statistical forecasting of the El Nino Southern Oscillation (ENSO), based on a combination of kernel methods for machine learning with techniques from operator-theoretic ergodic theory.  Read More

  • Untangling waves and vortices from limited observations

    Feb. 6, 2020

    CAOS researchers H. Wang and O.Bühler have developed a numerically robust algorithm to decompose the 1-D energy spectra obtained from ship/aircraft data sets.  This work is featured in Focus on Fluids by Journal of Fluid Mechanics. Read More

  • Predicting fluids flows from Lagrangian drifter observations

    Oct. 30, 2019

    Courant researchers M. A. Mohamad and A. J. Majda studied how Lagrangian observations can be used to recover Eulerian properties of a fluid flow using data assimilation techniques. They show how exact and approximate algorithms, which combine observations with a model, can be used to predict Eulerian properties of the flow field.

    Thumbnail: NASA Earth Observatory Read More

  • A flux-balanced fluid model for plasma edge turbulence with coherent zonal jet creation

    June 12, 2019

    Courant researchers A. J. Majda, D. Qi, and A. J. Cerfon propose a flux-balanced model to improve the understanding of plasma edge turbulence and creation of zonal structures and develop a theory to address the generation and persistence of large-scale coherent flow structures in these models. Read More

  • Upscale Impact of Mesoscale Convective Systems and Its Parameterization in an Idealized GCM for an MJO Analog above the Equator

    April 22, 2019

    A recent study by CAOS researchers Qiu Yang and Prof. Andrew Majda in collaboration with Mitchell W. Moncrieff from NCAR investigates the upscale impact of mesoscale convective systems (MCSs) on the Madden-Julian Oscillation (MJO) in an idealized GCM.  Read More

  • Reconstructing dynamics of chaotic systems using approximate eigenfunctions

    March 22, 2019

    A recent study by Suddhasattwa Das, Dimitrios Giannakis, and Joanna Slawinska investigates a phenomenon / object called approximate eigenfunctions to forecast dynamics of chaotic systems over arbitrary time scales. Read More

  • Understanding the atmospheric response to volcanoes

    Feb. 7, 2019

    Recent work by CAOS researchers Kevin DallaSanta and Ed Gerber with Matthew Toohey (GEOMAR Kiel) investigates the influence of volcanic eruptions on weather and climate using a hierarchy of models of varying complexity. Read More

  • Revealing the propagation characteristics of the Antarctic Circumpolar Wave and its teleconnection with the El Nino Soutern Oscillation

    Jan. 3, 2019

    Researchers at CAOS and UWM have studied the Antarctic Circumpolar Wave (ACW) in model and observational data via advanced data analysis techniques. The study has produced a decomposition of the ACW in terms of coherent spatiotemporal modes, some of which exhibit strong teleconnections with the El Nino Southern Oscillation. Read More

  • What limits our ability to characterize the variability of the large scale circulation of the extratropics?

    Dec. 3, 2018

    Courant faculty Dr. Edwin P. Gerber and Patrick Martineau (University of Tokyo) explore how dominant modes of atmospheric variability in the extratropics can be constrained with atmospheric reanalyses. Research finds the spread between reanalyses to be much less than the sampling uncertainty associated with the finite length of reanalysis records. Read More

  • Strategies for Predicting Statistical Responses in Complex Turbulent Systems

    Nov. 5, 2018

    CAOS researchers have developed a general mathematical framework to construct statistically accurate reduced-order models that have skill in capturing the statistical variability in the principal directions with largest energy of a general class of damped and forced complex turbulent dynamical systems. Read More

  • Modeling Ocean Uptake in an idealised Southern Ocean

    Nov. 2, 2018

    CAOS researchers in collaboration with researchers at Columbia University have investigated tracer fluxes and ocean upwelling in an idealized southern ocean model. The study finds the tracer fluxes to be sensistive to the vertical resolution, despite the reduction in the depths of the vigorously mixed boundary layers. Read More

  • Modeling the mélange

    July 2, 2018

    Icebergs are formed by calving, a natural process during which the ends of marine terminating glaciers break off and fall into the ocean. In Greenland, glaciers often terminate in narrow fjords with complex geometries, in which large iceberg becomes stuck for many months, freeze together, and form a sea-ice/iceberg mixture … Read More

  • Unlocking the Kolmogorov code of turbulence

    July 2, 2018

    Atmosphere and ocean flows present us with a complicated jigsaw puzzle of energetic motions on many scales, ranging from slow planetary waves on scales of 10,000 kilometers or so all the way down to small-scale three-dimensional turbulence, where dissipation of kinetic energy might take place on a scale of just … Read More

  • What controls moisture above the clouds?

    May 10, 2018

    CAOS researchers developed a new model of a moist world to explore the role of the tropical tropopause layer in regulating stratospheric water vapor. Read More

  • Oxygen, turbulence, and life in the oceans

    May 9, 2018

    CAOS researchers in New York and Abu Dhabi are exploring the complex interaction between turbulent ocean transport, biological interactions and oxygen in the Indian Ocean. Read More