Preprints

Filtering by Subject: Oceanography and Atmospheric Sciences and Meteorology

Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin

Vincent J. Clementi, Yair Rosenthal, Samantha C. Bova, et al.

Published: 2022-01-25
Subjects: Earth Sciences, Geochemistry, Geology, Hydrology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Physical Sciences and Mathematics

Submarine groundwater discharge is increasingly recognized as an important component of the oceanic geochemical budget, but knowledge of the distribution of this phenomenon is limited. To date, reports of meteoric inputs to marine sediments are typically limited to shallow shelf and coastal environments, whereas contributions of freshwater along deeper sections of tectonically active margins like [...]

Evaluation of changes in dry and wet precipitation extremes in warmer climates using a passive water vapor modelling approach

Marie-Pier Labonté, Timothy M Merlis

Published: 2022-01-22
Subjects: Climate, Oceanography and Atmospheric Sciences and Meteorology

Hydroclimatic extremes, such as heavy daily rainfall and dry spells, are expected to intensify under anthropogenic warming. Often, these changes are diagnostically related to thermodynamic increases in humidity with warming. Here, we develop a framework that uses an on-line calculation of the thermodynamically induced changes of the full precipitation distribution with warming in an idealized [...]

Diapycnal motion, diffusion, and stretching of tracers in the ocean

Henri Francois Drake, Xiaozhou Ruan, Raffaele Ferrari

Published: 2022-01-07
Subjects: Applied Mathematics, Fluid Dynamics, Non-linear Dynamics, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Small-scale mixing drives the diabatic upwelling that closes the abyssal ocean overturning circulation. Measurements of in-situ turbulence reveal that mixing is bottom-enhanced over rough topography, implying downwelling in the interior and stronger upwelling in a sloping bottom boundary layer. However, in-situ mixing estimates are indirect and the inferred vertical velocities have not yet been [...]

Dynamics of eddying abyssal mixing layers over rough topography

Henri Francois Drake, Xiaozhou Ruan, Raffaele Ferrari, et al.

Published: 2022-01-07
Subjects: Applied Mathematics, Earth Sciences, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

The abyssal overturning circulation is thought to be primarily driven by small-scale turbulent mixing. Diagnosed watermass transformations are dominated by rough topography "hotspots", where the bottom-enhancement of mixing causes the diffusive buoyancy flux to diverge, driving widespread downwelling in the interior—only to be overwhelmed by an even stronger upwelling in a thin Bottom Boundary [...]

Time-series analysis and statistical forecasting of daily rainfall in Kupang, East Nusa Tenggara, Indonesia: a pilot study

Sandy Hardian Susanto Herho, Gisma Aminurah Firdaus

Published: 2022-01-06
Subjects: Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics, Statistics and Probability

This pilot study presents a novel statistical time-series approach for analyzing daily rainfall data in Kupang, East Nusa Tenggara, Indonesia. By using the piecewise cubic hermite interpolation algorithm, we succeeded in filling in the null values in the daily rainfall time series. We then analyzed the monthly average and its pattern using the continuous wavelet transform (CWT) algorithm, which [...]

Insights into the mixing efficiency of submesoscale Centrifugal-Symmetric instabilities

Tomas Chor, Jacob O. Wenegrat, John Ryan Taylor

Published: 2021-11-11
Subjects: Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Submesoscale processes provide a pathway for energy to transfer from the balanced circulation to turbulent dissipation. One class of submesoscale phenomena that has been shown to be particularly effective at removing energy from the balanced flow are centrifugal-symmetric instabilities (CSIs), which grow via geostrophic shear production. CSIs have been observed to generate significant mixing in [...]

Massive-Parallel Trajectory Calculations version 2.2 (MPTRAC-2.2): Lagrangian transport simulations on Graphics Processing Units (GPUs)

Lars Hoffmann, Paul F. Baumeister, Zhongyin Cai, et al.

Published: 2021-11-10
Subjects: Atmospheric Sciences, Computer Sciences, Meteorology, Numerical Analysis and Scientific Computing, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Lagrangian models are fundamental tools to study atmospheric transport processes and for practical applications such as dispersion modeling for anthropogenic and natural emission sources. However, conducting large-scale Lagrangian transport simulations with millions of air parcels or more can become numerically rather costly. In this study, we assessed the potential of exploiting graphics [...]

Deadly Heat Exposure in an Urbanized World

Steffen Lohrey, Camilo Mora, Diana Reckien, et al.

Published: 2021-10-11
Subjects: Climate, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology, Sustainability

Climate-change exposes an increasing share of the world population to potentially lethal heat, a threat accentuated by rapid urbanization. Here, we project occurrence of future deadly heat for urban agglomerations around the world until 2080 by using CMIP6 climate model projections of temperature and relative humidity, urbanization prospects and GDP projections from the SSP scenarios. We show [...]

Pangeo Forge: Crowdsourcing Analysis-Ready, Cloud Optimized Data Production

Charles Stern, Ryan Abernathey, Joseph J Hamman, et al.

Published: 2021-10-01
Subjects: Earth Sciences, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology

Pangeo Forge is a new community-driven platform that accelerates science by providing high-level recipe frameworks alongside cloud compute infrastructure for extracting data from provider archives, transforming it into analysis-ready, cloud-optimized (ARCO) data stores, and providing a human- and machine-readable catalog for browsing and loading. In abstracting the scientific domain logic of data [...]

The Impact of Neglecting Climate Change and Variability on ERCOT’s Forecasts of Electricity Demand in Texas

Jangho Lee, Andrew Dessler

Published: 2021-09-16
Subjects: Earth Sciences, Environmental Sciences, Environmental Studies, Oceanography and Atmospheric Sciences and Meteorology, Risk Analysis

The Electric Reliability Council of Texas (ERCOT) manages the electric power across most of Texas. They make short-term assessments of electricity demand based on historical weather over the last decade or two, thereby ignoring the effects of climate change and the possibility of weather variability outside of the recent historical range. In this paper, we develop an empirical methodology to [...]

Tropical Cyclones Affecting Tokyo and Changing Storm Surge Hazard since 1980

Md. Rezuanul Islam, Masaki Satoh, Hiroshi Takagi

Published: 2021-09-08
Subjects: Earth Sciences, Oceanography and Atmospheric Sciences and Meteorology, Risk Analysis

This study investigated tidal records and landfall tropical cyclone (TC) best tracks in Japan from 1980 to 2019 to determine changes in storm surge heights in coastal regions of eastern Japan, including Tokyo. The results indicate that annual mean storm surge heights have increased in the last 20 years (2000–2019) compared to those in 1980–1999, and that these changes are noteworthy, particularly [...]

Changes in poleward atmospheric energy transport over a wide range of climates: Energetic and diffusive perspectives and a priori theories

Timothy M Merlis, Nicole Feldl, Rodrigo Caballero

Published: 2021-09-07
Subjects: Oceanography and Atmospheric Sciences and Meteorology

The midlatitude poleward atmospheric energy transport increases in radiatively forced simulations of warmed climates across a range of models from comprehensive coupled general circulation models (GCMs) to idealized aquaplanet moist GCMs to diffusive moist energy balance models. These increases have been rationalized from two perspectives. The energetic (or radiative) perspective takes the [...]

A high-resolution downscaled CMIP6 projections dataset of essential surface climate variables over the globe coherent with the ERA5-Land reanalysis for climate change impact assessments

Thomas NOEL, Harilaos Loukos, Dimitri Defrance

Published: 2021-08-30
Subjects: Earth Sciences, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology

A high-resolution climate projections dataset is obtained by statistically downscaling climate projections from the CMIP6 experiment using the ERA5-Land reanalysis from the Copernicus Climate Change Service. This global dataset has a spatial resolution of 0.1°x 0.1°, comprises 5 climate models and includes two surface daily variables at monthly resolution: air temperature and precipitation. Two [...]

Comprehensive aerial survey quantifies high methane emissions from the New Mexico Permian Basin

Yuanlei Chen, Evan David Sherwin, Elena S.F. Berman, et al.

Published: 2021-08-21
Subjects: Atmospheric Sciences, Engineering, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology, Oil, Gas, and Energy, Physical Sciences and Mathematics

Limiting emissions of climate-warming methane from oil and gas (O&G) is a major opportunity for short-term climate benefits. We deploy a basin-wide airborne survey of the New Mexico Permian Basin, spanning 35,923 km^2, 26,292 active wells, and over 15,000 km of natural gas pipelines using an independently-validated hyperspectral methane point source detection and quantification system. The [...]

Root foraging alters global patterns of ecosystem legacy from climate perturbations

Max Berkelhammer, Beth Drewniak, Benjamin Ahlswede, et al.

Published: 2021-08-19
Subjects: Earth Sciences, Oceanography and Atmospheric Sciences and Meteorology

The response of terrestrial ecosystems to climate perturbations typically persist longer than the timescale of the forcing, a phenomenon that is broadly referred to as ecosystem legacy. Understanding the strength of legacy is critical for predicting ecosystem sensitivity to climate extremes and the extent to which persistent changes in land surface-atmosphere exchange might feedback onto the [...]

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