Phys.org: Earth science

Water vapor (H2Ov) is an essential component of Earth's atmosphere, playing critical roles in climate regulation, weather patterns, and the water cycle. Its sources primarily come from natural processes such as ocean evaporation and terrestrial evapotranspiration. However, during the fossil fuels (e.g., coal, petroleum, natural gas) combustion process, in addition to emitting substantial amounts of CO2, they also generate significant amounts of water vapor as a byproduct (combustion-derived water vapor sources: CDWV).

An ongoing string of more than a dozen earthquakes in less than 90 minutes early Monday ended what had been some recent calm from recent weeks of shaking ground in the region, according to the U.S. Geological Survey.

A study by the Institut Català de Paleontologia Miquel Crusafont (ICP-CERCA) with the involvement of the UAB indicates that between 12.5 and 9 million years ago, in the Vallès-Penedès basin, rainfall was twice as high as it is today, and the climate was subtropical. The research has reconstructed the precipitation and climatic conditions of the past from fossils of small mammals found throughout the area. The research is published in the Journal of Mammalian Evolution.

A research team from the Aerospace Information Research Institute of the Chinese Academy of Sciences (AIRCAS) has developed a new method combining deep learning with physical radiative transfer modeling to improve the retrieval of atmospheric aerosol properties from complex satellite observations, supporting high-resolution, near-real-time monitoring of haze and dust events. The study was recently published in Journal of Remote Sensing.

Some tropical land regions may warm more dramatically than previously predicted, as climate change progresses, according to a new CU Boulder study that looks millions of years into Earth's past. Using lake sediments from the Colombian Andes, researchers reveal that when the planet warmed millions of years ago under carbon dioxide levels similar to today's, tropical land heated up nearly twice as much as the ocean.

A research group has revealed through seismic wave analysis that the oceanic plate beneath the Ontong Java Plateau—the world's largest oceanic plateau—was extensively altered by massive volcanic activity during its formation. The study is published in Geophysical Research Letters.

Dalhousie researchers have revealed how Arctic aquifers—permeable layers of the ground that store and transmit water to rivers, lakes and terrestrial ecosystems—behave today and how these vital resources will change with warming temperatures and sea-level rise.

Earth's ocean absorbs carbon dioxide from the atmosphere, helping to temper the impact of climate change but increasing ocean acidity. However, calcium carbonate minerals found in the seabed act as a natural antacid: Higher acidity causes calcium carbonate to dissolve and generate carbonate molecules that can neutralize the acid.

Climate experts have identified an atmospheric configuration that can release huge volumes of water in a matter of minutes. Led by Newcastle University and the UK Met Office, the research helps explain some of the world's most dangerous flash-flood events and may aid future improvements in identifying risk. It offers forecasters new insights and could in the future help communities mitigate against extreme weather events.

New research may have solved an American mystery which has baffled geologists for a century and a half: How did a river carve a path through a mountain in one of the country's most iconic landscapes? Scientists have long sought an answer to this question of how the Green River, the largest tributary of the Colorado River, managed to create a 700-meter-deep canyon through Utah's 4km-high Uinta Mountains instead of simply flowing around them. The question is particularly confounding because, while the Uinta Mountains are 50 million years old, the Green River has been following this route for less than 8 million years.

Sandstone beneath the North Sea could be used to store carbon dioxide, a study has claimed. The British Geological Survey (BGS) report shows how sandstone beneath the North Sea could assist with the U.K.'s plans for carbon capture and storage (CCS).

Sediment containing rare earth was retrieved from ocean depths of 6,000 meters (about 20,000 feet) on a Japanese test mission, the government said Monday, as it seeks to curb dependence on China for the valuable minerals.

A recent satellite-based study has uncovered alarming declines in groundwater storage across High Mountain Asia (HMA), widely known as the "Asian Water Tower." This critical water source, which sustains agricultural irrigation, urban water supplies and ecological security for hundreds of millions of people in more than a dozen downstream countries, is depleting at a staggering rate of approximately 24.2 billion tons per year.

When it comes to global warming and climate change, we often hear news stories about tipping points where Earth's systems shift into a new and dangerous state. One such may have been reached in the year 2000 that caused tropical weather cycles to have a greater effect on autumn sea ice melt across the Laptev and East Siberian seas, according to a study published in Science Advances.

Ditches and canals are the underdog of the freshwater world. These human-made waterways are often forgotten, devalued, and perceived negatively—think "dull as ditchwater." But these unsung heroes have a hidden potential for climate change mitigation, if they're managed correctly.

Using a new method to track groundwater levels and greenhouse gas emissions, researchers uncover the climate impact of Southeast Asia's peatlands. In Indonesia, Malaysia, and other parts of Southeast Asia, vast areas spanning up to 300,000 square kilometers have emerged over thousands of years as plants grow and thrive in dense tropical peat swamp forests, then die and slowly decompose in waterlogged, low-oxygen conditions.

Australia has always had heat waves. But this week's heat wave in southeastern Australia is something else. Temperatures in some inland towns in South Australia, New South Wales and Victoria were up to 20°C above average for the time of year, which meteorologists described as "incredibly abnormal." Victoria's heat record toppled after Walpeup and Hopetoun hit 48.9°C. The heat is set to continue until Saturday in some areas.

This week, Victoria recorded its hottest day in nearly six years. On Jan. 27, the northwest towns of Walpeup and Hopetoun reached 48.9°C, and the temperature in parts of Melbourne soared over 45°C. Towns in South Australia also broke heat records.

Far from simply a source of unstructured online content, disaster management in the digital age can be supported by careful analysis of online social-media data, suggests a paper published in Natural Hazards and Earth System Sciences (NHESS) titled "Social Media for Managing Disasters Triggered by Natural Hazards: A Critical Review of Data Collection Strategies and Actionable Insights."

Researchers at Concordia have developed a new method of measuring the amount of usable water stored in snowpacks. The comprehensive technique, known as snow water availability (SWA), uses satellite data and climate reanalysis techniques to calculate snow depth, snow density, and snow cover across a wide swath of Canada and Alaska.