Preprints
Filtering by Subject: Physical Sciences and Mathematics
A hybrid approach to enhance streamflow simulation in data-constrained Himalayan basins: Combining the Glacio-Hydrological Degree-Day Model and Recurrent Neural Networks
Published: 2024-04-12
Subjects: Physical Sciences and Mathematics
The Glacio-hydrological Degree-day Model (GDM) is a distributed model but prone to uncertainties due to its conceptual nature, parameter estimation, and limited data in the Himalayan basins. To enhance accuracy without sacrificing interpretability, we propose a hybrid model, GDM-RNNs, combining GDM with Recurrent Neural Networks (RNNs). Three RNN types (Simple RNN, GRU, LSTM) are integrated with [...]
Part 1: Anthropocene Series/Epoch: stratigraphic context and justification of rank The Anthropocene Epoch and Crawfordian Age: proposals by the Anthropocene Working Group
Published: 2024-04-12
Subjects: Physical Sciences and Mathematics
The Anthropocene Working Group (AWG) has concluded that the Anthropocene represents geological reality and should be linked with the plethora of stratigraphic proxies that initiate or show marked perturbations at around the 1950s, and should be defined using a Global boundary Stratotype Section and Point (GSSP). We propose formalizing the Anthropocene as series/epoch, terminating the Holocene [...]
Part 2: Descriptions of the proposed Crawford Lake GSSP and supporting SABSs. The Anthropocene Epoch and Crawfordian Age: proposals by the Anthropocene Working Group
Published: 2024-04-12
Subjects: Physical Sciences and Mathematics
This part of the Anthropocene Working Group (AWG) submission proposes that the base of the Anthropocene should be defined as series/epoch, terminating the Holocene Series/Epoch with a single Crawfordian stage/age using a Global boundary Stratotype Section and Point (GSSP) in an annually varved Crawford Lake core, Ontario, Canada, defined at 17.5 cm in core CRA23-BC-1F-B at the base of the dark [...]
Late Holocene relative sea-level records from coral microatolls in Singapore
Published: 2024-04-11
Subjects: Earth Sciences, Physical Sciences and Mathematics
Late Holocene relative sea-level (RSL) data are important to understand the drivers of RSL change, but there is a lack of precise RSL records from the Sunda Shelf. Here, we produced a Late Holocene RSL reconstruction from coral microatolls in Singapore, demonstrating for the first time the utility of Diploastrea heliopora microatolls as sea-level indicators. We produced 12 sea-level index points [...]
FLOWIDER 1.0: a web-based interface to track flood-season water levels of large rivers of India’s Gangetic plains
Published: 2024-04-08
Subjects: Life Sciences, Physical Sciences and Mathematics
Accessing and analysing flood-season water level data is crucial for monitoring riverine biodiversity and ecosystems. The Gangetic plains are among the largest river floodplains in the world. Temporal flood-season water level data for rivers of the Gangetic basin in India, though available in the public domain, are often scattered across web-based sources and recorded in non-translatable formats. [...]
Evaluation for the Impacts of Numerical Advection Schemes and Turbulence Modeling on Gray-Zone Simulation of a Squall Line
Published: 2024-04-05
Subjects: Physical Sciences and Mathematics
With increasing computational power, atmospheric simulations have approached the gray zone resolutions where energetic turbulent eddies are partly resolved. The representation of turbulence in the gray zone is challenging and sensitive to the choices of turbulence models and numerical advection schemes. Some numerical advection schemes are designed with numerical dissipation to suppress [...]
Geostratigraphic mapping of the intrusive Valentine Domes on the Moon
Published: 2024-04-05
Subjects: Physical Sciences and Mathematics, Planetary Sciences
Lunar intrusive igneous rocks have not been widely studied in the past; this is related to their rare occurrence in the surface of the Moon, and the difficulty to identify them. Most of the known structures of this type were discovered with telescopic images and were identified as intrusive domes, which are characterized by their oval shape, low slope, and subtle effect in the topography. We [...]
Breaking internal waves on sloping topography: connecting parcel displacements to overturn size, interior-boundary exchanges, and mixing
Published: 2024-04-05
Subjects: Physical Sciences and Mathematics
Internal waves impinging on sloping topography can generate mixing through the formation of near-bottom bores and overturns in what has been called the `internal swash' zone. Here we investigate the mixing generated during these breaking events, and the subsequent ventilation of the bottom boundary layer, across a realistic non-dimensional parameter space for the ocean using three-dimensional [...]
A labeling intercomparison of retrogressive thaw slumps by a diverse group of domain experts
Published: 2024-04-05
Subjects: Physical Sciences and Mathematics
Deep-learning (DL) models have become increasingly beneficial for the detection of retrogressive thaw slumps (RTS) in the permafrost domain. However, comparing accuracy metrics is challenging due to unstandardized labeling guidelines. To address this, we conducted an experiment with 12 international domain experts from a broad range of scientific backgrounds. Using 3m PlanetScope multispectral [...]
Estimating microphysical properties of ice clouds for climate modeling and remote sensing applications
Published: 2024-04-04
Subjects: Earth Sciences, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
Ice clouds pose crucial challenges in climate model simulations and remote sensing retrievals due to complicated mechanisms of ice cloud formation that span from micro scale to planetary wave scale. Despite numerous attempts to parameterize these processes, many questions remain unanswered. This technical note provides a summary of the most common and recent studies on ice clouds and compiles [...]
Development of a Snow Growth Model for Rimed Snowfall
Published: 2024-04-04
Subjects: Earth Sciences, Physical Sciences and Mathematics
A snow growth model for rimed snowfall (SGMR) was developed based on the growth processes of vapor deposition, aggregation, and riming. The SGMR is initialized by radar reflectivity (Z) at the cloud top and thereafter simulates the vertical evolution of size spectra. The SGMR is based on the zeroth- and second-moment conservation equations with respect to mass, and thus conserves the number [...]
Progress in Understanding North American Monsoon Using a Climate Model
Published: 2024-04-01
Subjects: Earth Sciences, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
The North American Monsoon is a seasonal shift in the large-scale circulation that supplies 60-80% of annual rainfall in northwestern Mexico and 30-40% in the US southwest. Regional climate models have shown that summer precipitation prediction over North America is the poorest in the Monsoon region. Most climate models do not account for a crucial mechanism of Monsoon: the boundary layer [...]
Improving Subsidence Modelling of Different Depth Domains in the Mekong Delta
Published: 2024-03-31
Subjects: Physical Sciences and Mathematics
The Mekong delta, one of the largest deltas in the world, is densely populated and important for food production. As the delta plain is lowly elevated, less than a meter on average above local sea level, it is vulnerable to sea-level rise and land subsidence. The delta experiences high rates of natural compaction at its coast) while human activities associated with land-use change , urbanisation [...]
Explaining land subsidence variation along the north coast of Java for Semarang and Pekalongan, Indonesia
Published: 2024-03-31
Subjects: Physical Sciences and Mathematics
This study investigates the significant land subsidence in the cities of Semarang and Pekalongan on the north coast of Java. High land subsidence rates of several cm up to dm per year have being reported, directly contributing to relative sea-level rise. This research uses PS-InSAR data to analyze the spatial and temporal variations in subsidence and identify its causes, which are expected to be [...]
Global environmental plastics dispersal under OECD policy scenarios towards 2060
Published: 2024-03-30
Subjects: Physical Sciences and Mathematics
Plastics occupy a central role in the global economy, yet cause significant damage to ecosystems and human health. Recent studies and OECD reports have provided comprehensive roadmaps to reduce the environmental impacts of plastics, based on coordinated global action to reduce plastic consumption and improve waste management and recycling. Leakage of mismanaged plastic waste to aquatic [...]