A5062652439- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Winter Sports Injuries and Performance
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Global Energy and Sustainability Research
- Geological Studies and Exploration
- Earth Systems and Cosmic Evolution
- Radioactive contamination and transfer
- Complex Systems and Time Series Analysis
- Landslides and related hazards
- Hydrology and Watershed Management Studies
- Climate Change Policy and Economics
- Nuclear Issues and Defense
- Astronomical and nuclear sciences
- Multi-Agent Systems and Negotiation
- CO2 Sequestration and Geologic Interactions
- Geological formations and processes
- Agricultural risk and resilience
Los Alamos National Laboratory
2012-2024
Computational Physics (United States)
2016-2024
Pacific Northwest National Laboratory
2022
Oregon State University
2020
Courant Institute of Mathematical Sciences
2016-2018
New York University
2016-2018
University of Arizona
2009-2014
Applied Mathematics (United States)
2009-2014
Abstract This work documents version two of the Department Energy's Energy Exascale Earth System Model (E3SM). E3SMv2 is a significant evolution from its predecessor E3SMv1, resulting in model that nearly twice as fast and with simulated climate improved many metrics. We describe physical lower horizontal resolution configuration consisting 110 km atmosphere, 165 land, 0.5° river routing model, an ocean sea ice mesh spacing varying between 60 mid‐latitudes 30 at equator poles. The...
The processes responsible for freshwater flux from the Antarctic Ice Sheet (AIS), ice-shelf basal melting and iceberg calving, are generally poorly represented in current Earth System Models (ESMs). Here we document cryosphere configuration of U.S. Department Energy's Energy Exascale Model (E3SM) v1.2. This includes simulating melting, which has been implemented through ocean circulation within static cavities, allowing ability to calculate melt rates associated heat fluxes. In addition,...
This work documents version two of the Department Energy's Energy Exascale Earth System Model (E3SM). E3SM 2 (E3SMv2) is a significant evolution from its predecessor E3SMv1, resulting in model that nearly twice as fast and with simulated climate improved many metrics. We describe physical lower horizontal resolution configuration consisting 110 km atmosphere, 165 land, 0.5° river routing model, an ocean sea ice mesh spacing varying between 60 mid-latitudes 30 at equator poles. The...
Abstract. When subglacial meltwater is discharged into the ocean at grounding line, it acts as a source of buoyancy, enhancing flow speeds along ice base that result in higher basal melt rates. The effects discharge have been well studied context Greenland-like, vertical calving front, where Earth's rotation can be neglected. Here we study these Antarctic shelves, important. We use numerical model to simulate circulation and melting beneath an idealized three-dimensional shelf vary rate...
Abstract The Southern Ocean overturning circulation is driven by winds, heat fluxes, and freshwater sources. Among these sources of freshwater, Antarctic sea ice formation melting play the dominant role. Even though ice-shelf melt relatively small in magnitude, it located close to regions convection, where may influence dense water formation. Here, we explore impacts on water-mass transformation (WMT) using simulations from Energy Exascale Earth System Model (E3SM) both with without explicit...
This work documents version two of the Department Energy’s Energy Exascale Earth System Model (E3SM). E3SM 2 (E3SMv2) is a significant evolution from its predecessor E3SMv1, resulting in model that nearly twice as fast and with simulated climate improved many metrics. We describe physical lower horizontal resolution configuration consisting 110 km atmosphere, 165 land, 0.5° river routing model, an ocean sea ice mesh spacing varying between 60 mid-latitudes 30 at equator poles. The...
Subglacial discharge beneath ice shelves is a source of freshwater, and therefore buoyancy, at the grounding line. Being released depth, it accelerates an ascending plume along ice-shelf base, enhancing entrainment ambient waters, increasing melt rates. By now understood that subglacial key control on rate variability majority Greenland's glaciers. However, its importance in present-day future Antarctic rates less clear. To address this point, we use Energy Exascale Earth System Model (E3SM)...
[1] A model of iceberg motion has been implemented in the Los Alamos sea ice (CICE). Individual bergs are tracked under influence winds, currents, surface tilt, Coriolis, and forcing. In turn, is affected by presence icebergs, primarily as obstacles that cause to ridge on upstream side or create open water downstream bergs. Open formed near icebergs due ridging blocking advection increases level ridged through increased frazil formation. Resulting anomalies area thickness (compared with a...
Abstract We present a multiscale study examining the impact of regional exchange nuclear weapons on global climate. Our models investigate multiple phases effects usage, including growth and rise fireball, ignition spread induced firestorm, comprehensive Earth system modeling oceans, land, ice, atmosphere. This follows from scenario originally envisioned by Robock, Oman, Stenchikov, et al. (2007, https://doi.org/10.5194/acp-7-2003-2007 ), based analysis Toon...
Fluvial channels in metamorphic core complexes are preferentially oriented parallel and perpendicular to the direction of tectonic extension. This pattern has been variably attributed such causes as tilting during extension, channel elongation by slip along range-bounding detachment fault, exploitation extension-related joint sets incision. In this paper we use field measurements, digital elevation model analyses, numerical modeling test hypotheses for structural control fluvial complexes,...
Abstract We document the configuration, tuning, and evaluation of a modified version Community Earth System Model 1 (Hurrell et al., 2013, https://doi.org/10.1175/BAMS-D-12 ), introduced here as E3SMv0‐HiLAT, intended for study high‐latitude processes. E3SMv0‐HiLAT incorporates changes to atmospheric model affecting aerosol transport high northern latitudes reduce shortwave cloud bias over Southern Ocean. An updated sea ice includes biogeochemistry that is coupled an extended ocean model's...
We propose criteria that define a trend for time series with inherent multi-scale features. call this the tendency of series. The is defined empirically by set and captures large-scale temporal variability original signal as well most frequent events in its histogram. Among other properties, has variance no larger than signal; histogram difference between symmetric possible; reduced complexity, essential features signal. To find we first use intrinsic time-scale decomposition (ITD) signal,...
Abstract. The Energy Exascale Earth System Model (E3SM) is a state-of-the-science system model (ESM) with the ability to focus horizontal resolution of its multiple components in specific areas. Regionally refined global ESMs are motivated by need explicitly resolve, rather than parameterize, relevant physics within regions resolution, while offering significant computational cost savings relative respective configurations high-resolution (HR) everywhere on globe. In this paper, we document...
Abstract. Geologic evidence suggests that the Earth may have been completely covered in ice distant past, a state known as Snowball Earth. This is still subject of controversy, and has focus modeling work from low-dimensional models up to state-of-the-art general circulation models. In our present global climate, ocean plays large role redistributing heat equatorial regions high latitudes, an important part budget, its initiation Earth, subsequent great interest. To better understand oceanic...
Subglacial runoff beneath ice shelves is a source of freshwater, and therefore buoyancy, at the grounding line. Being released depth, it accelerates an ascending plume along ice-shelf base, enhancing entrainment ambient waters, increasing melt rates. By now understood that subglacial key control on rate variability majority Greenland's glaciers. However, its importance in present-day future Antarctic rates less clear. To address this point, we use Energy Exascale Earth System Model (E3SM)...
To date, few Earth System Models (ESMs) have the ability to simulate flow in ocean cavities below Antarctic ice shelves and its influence on basal melting.  Yet capturing both this resulting melt patterns is critical for representing local, regional, global feedbacks between climate sub-ice-shelf Here, we present a small ensemble of historical simulations SSP3-7.0 projections an ESM that includes ice-shelf cavities, Energy Exascale Model (E3SM) v2.1.  The active ocean,...
Global ocean models are typically too coarse to explicitly resolve physical processes, such as mesoscale eddies, that transport heat into ice-shelf cavities and contribute melting. As a result, processes around Antarctica in need be parameterized. Here we investigate the performance of these parameterizations Energy Exascale Earth System Model (E3SM), specifically focusing on an ice shelf cavity, strength direction sub circulation, rate basal Taking advantage E3SM’s...
Abstract. Some ocean modeling studies have identified a potential tipping point from low to high basal melt regime beneath the Filchner–Ronne Ice Shelf (FRIS), Antarctica, with significant implications for subsequent Antarctic ice sheet mass loss. To date, investigation of climate drivers and impacts this possible event been limited because ice-shelf cavities melting are only now starting be included in global models. Using ocean–sea-ice configuration Energy Exascale Earth System Model...
Abstract. When subglacial meltwater is discharged into the ocean at grounding line, it acts as a source of buoyancy, enhancing flow speeds along ice base that result in higher basal melt rates. The effects discharge have been well studied context Greenland-like, vertical calving front, where Earth's rotation can be neglected. Here we study these Antarctic shelves, important. We use numerical model to simulate circulation and melting beneath an idealized three-dimensional shelf vary rate...