Articles tagged with Sea Level Change
The central-western Greenland Ice Sheet is losing mass at an accelerating rate, with early warning signals suggesting a critical transition. The melt-elevation feedback mechanism drives this destabilization, indicating significantly enhanced melting in the near future.
A study analyzing hydrogen isotopic composition of marine sediments found interglacial summer warmth influences Greenland Ice Sheet (GIS) retreat more strongly than maximum temperatures. This research suggests persistently high summer temperatures will be more harmful to the ice sheet's long-term stability under climate change.
Research team analyzed fossilized pollen from 27 islands, finding a consistent pattern of accelerated vegetation turnover after human arrival. The study suggests that earlier settlements may have been more resilient to human impact, while later settlers' practices were more transformative.
Scientists reconstructed fluctuations in ocean chemistry by analyzing strontium isotope ratios, which provide information about geochemical processes. The study found that seawater strontium concentration has changed considerably over the past 35 million years and still changes today.
A new study questions the use of pyrite as a proxy for reconstructing oxygen levels in Earth's oceans. Researchers found that signals from pyrite in sediments are more controlled by sea level changes in shallow waters than other factors. This challenges current methods for understanding ocean chemistry and oxygenation.
A new study by McGill University researchers demonstrates that changes in the Antarctic ice sheet were driven by melting ice sheets in the Northern Hemisphere. The team used numerical modeling and geological records to simulate simultaneous changes in sea levels and ice dynamics, revealing a complex connection between the two hemispheres.
Scientists compiled new evidence that atolls are formed by cyclic changes in sea level, contradicting Darwin's 1842 theory. Researchers found that atolls were created by flat-topped banks built over 5 million years ago, driven by fluctuations in the Earth's climate.
Researchers have investigated the emergence and development of cracks in glaciers, revealing a feedback process that accelerates fractures and weakening. This process is key to determining the stability of ice sheets and their contribution to rising sea levels.
A new study suggests that climate change may require cultural sites to undergo transformation rather than strict preservation. Experts argue that some landmarks should remain damaged as a 'memory' of the event and serve as a warning for communities.
The Florida Current, a key component of the Gulf Stream, has slowed significantly over the past century, with its strength being the weakest in the past 110 years. This decline is linked to the broader Atlantic Meridional Overturning Circulation (AMOC) system, which plays a crucial role in regulating global climate.
Researchers from the University of Texas at Austin developed a computer model that connects distinct patterns in sedimentary deposits to shifts in climate and tectonic activity. The model, which uses a 3D source-to-sink approach, allows scientists to simulate the world under different tectonics and climate conditions.
A new study by Simon Fraser University reveals that sea levels in the central Indian Ocean have risen by nearly a meter over the last two centuries. The research provides new insights into historical sea level variability and its impact on coral reefs and islands.
Researchers created an extreme sea level indicator using historical data from US coastlines to understand the causes of sea level changes. The study found that different factors play a role in extreme sea levels, varying by location and time.
Researchers found significant changes in Antarctica's ice shelf thickness, causing ice to flow into the ocean. Thinning ice shelves result in a significant instantaneous response to ice flow and ongoing mass loss, affecting global sea levels.
A recent study by Colorado State University researchers highlights the impact of climate change on aging US bridges. The analysis reveals that rising temperatures will disproportionately affect bridges in northern regions, leading to increased thermal stress and potential structural damage.
A Japanese team analyzed sediment cores from Northwestern Australia to understand past climate variability and sea-level change. The results indicate that the global ice sheet changed on a shorter timescale than previously thought, revealing short-period ice-sheet dynamics during the last ice age.
The GRACE twin satellite system has contributed nearly two decades of crucial data to our understanding of global climate patterns. The mission has recorded three times the mass of ice lost in polar and mountainous regions, and enabled a measure of heat added to oceans.
Researchers analyzed wind speed and wave height measurements from satellites and ocean buoys to find extreme winds increasing by 8% and waves by 5% in the Southern Ocean over the past 30 years. This increase has significant implications for rising sea levels and coastal flooding.
A new drilling expedition has uncovered a dramatic and complex record of past changes in climate and sea level in the Gulf of Corinth. The research sheds light on how global climate fluctuations influence sedimentation rates, particularly for the earliest sediments deposited as new ocean basins form.
The International Astronomical Union has adopted the new ICRF-3 reference frame with global validity since January 2019. It provides improved precision for positioning systems like GPS and space probes, enabling accurate navigation in the sky and on Earth's surface.
Research on ancient coral cores from the Great Barrier Reef reveals two distinct periods of rapid sea level fluctuations between 22,000 and 19,000 years ago. These findings challenge current understanding of glacier dynamics and suggest that climate models may need to be revised to account for faster changes.
The Technical University of Munich (TUM) has developed an adaptive algorithm called ALES+, which can accurately measure sea levels in both open and ice-covered ocean areas. This improvement enables researchers to track changes in sea level and ocean currents, crucial for understanding climate change.
A study from Uppsala University reveals a link between ice volume, sea level changes and desertification in Eurasia. The research found that as ice volume decreased and sea levels rose, summer monsoon rainfalls intensified, while sandy deserts retreated.
A study of waterfalls found that river bed rock composition plays a crucial role in shaping the surrounding landscape over time. The research revealed that changes to the river bed material significantly impact how quickly waterfalls migrate upstream.
The report reveals that global CO2 emissions from all human activities reached 41 billion tonnes in 2017, following a projected rise in burning fossil fuels. This delay is attributed mainly to China's growing coal use, reversing previous decreases since 2013.
The 2017 Climate Science Special Report details past, current and projected changes to the climate, including increased atmospheric and ocean temperatures, melting glaciers, and rising sea levels. Alaska climatologist John Walsh is a contributing author and can provide insights on recent U.S. climate change in the global context.
A new review in Marine Geology reveals that slightly warmer temperatures and moderate CO2 concentrations over 100,000 years ago led to dramatic superstorms and sea-level rise in the Bahamas and Bermuda. The study emphasizes that strong climate forcing is not required to yield major impacts on the ocean and ice caps.
Human activities have significantly impacted the planet, changing global climate, sea levels and biosphere. The Anthropocene Working Group proposes formalizing this new epoch to acknowledge these changes.
The Caspian Sea has been slowly evaporating over the past two decades, with water levels dropping nearly 7 centimeters per year from 1996 to 2015. This increase in evaporation is linked to rising surface air temperatures associated with climate change.
Researchers have discovered that sedimentary cycles are linked to sea level changes, rather than mountain erosion. The study uses carbon isotopes to predict sedimentary rock distribution and better understand the Earth's sedimentary history.
A recent study by Dr. Kirk Winemiller and his Brazilian colleagues analyzed a long-term database of fish survey statistics and hydrology in the central Amazon. The research reveals that climate change is causing alterations in regional precipitation, affecting water quantity and quality and leading to changes in fish species populations.
A new UCI study shows that Canadian glaciers are losing ice at an alarming rate, with surface melt accounting for 90% of the loss since 2005. The researchers found that the Queen Elizabeth Islands' ice cap has been melting by 900 percent annually, contributing to sea level change.
Researchers at Lund University have mapped out an exceptionally well-preserved Stone Age site in southern Sweden, shedding light on the lives of Mesolithic humans. The discovery includes a 9,000-year-old pick axe made from elk antlers, indicating mass fishing and a semi-permanent settlement.
The MARISA consortium will utilize social and physical sciences to create, analyze, and translate climate information for decision-making. Climate change projections indicate significant impacts on the Chesapeake Bay Watershed, including sea-level rise, temperature changes, and storm frequency.
Researchers found that certain plant species can quickly respond to induced climate challenges through rapid genetic changes. This study suggests that pre-existing genetic variation plays a crucial role in supporting plant resilience in the face of climate change.
A University of Washington researcher argues that people should pay more attention to how climate change affects ocean and coastal environments globally. The review paper looks at scientific understanding of ocean changes and responses from people around the world, highlighting potential for local action and interdisciplinary research.
A study by UC Santa Barbara scientist Alex Simms has found that the Pacific coast of North America is not uplifting as rapidly as previously thought. The researchers recalculated uplift rates for California and other areas, applying a correction for glacio-isostatic adjustment, which affects ocean levels due to past ice sheets.
Australian scientists predict that many tropical mountain plant species will be unable to survive their current locations by 2080 due to high-altitude climate changes. The Wet Tropics World Heritage Area in Queensland is at risk of losing its endemic plants.
Scientists at the University of Southampton found that ocean tides have increased by 1-2 mm per year globally, with some sites experiencing changes comparable to global mean sea level rise. This has significant implications for energy extraction, coastal flooding and erosion, navigation and sediment movement.
A new study reveals that a small variation in sea level can stall coral reef growth and sediment production, contradicting the long-held notion of continuous reef formation. The research found that most lagoon infilling occurred over just four thousand years before being 'turned off' by a relatively small sea level fall.
Richard Alley has received the BBVA Foundation Frontiers of Knowledge Award in Climate Change for his pioneering research on abrupt climate change. He is recognized as a leading expert on ice and its implications for fast glacier flow and sea-level change.
Researchers found a long-term pattern in salinity-driven sea level changes globally, with increases in the Pacific Ocean and decreases in the Atlantic. This salinity effect accounts for approximately 25% of total sea level change, emphasizing its importance in assessments.
Researchers found that intermediate sea levels and ice volumes triggered abrupt climate swings, with temperatures changing dramatically over a few decades. This discovery can help explain the rapid climate changes known as Dansgaard-Oeschger events during the last ice age.
Scientists at Chalmers University of Technology have developed a new tide gauge that measures sea level using GPS signals. This innovation allows for the monitoring of sea level changes with high precision, enabling researchers to study the effects of climate change on coastal societies.
Researchers have developed a new way to determine sea-level changes and deep-sea temperature variability over the past 5.3 million years. The findings provide crucial new information on how ice ages came about, and could help determine the relationship between carbon dioxide levels, global temperatures, and sea levels.
Researchers have discovered new relationships between deep-sea temperature and ice-volume changes to provide insight into the climatic relationships that caused major ice-age cycles. The study found that cooling events and continental ice-volume cycles occurred at different times, contradicting previous theories.
A new study suggests that Atlantic deep water formation may be much more fragile than previously realised, with sudden and large reductions in the influence of these North Atlantic waters in the deep ocean. This could have widespread impacts on regional sea level, droughts, and ocean acidification under future climate change scenarios.
A team of NYU scientists found strong correlations between North and tropical Atlantic Ocean warming and subsequent changes in Antarctica's sea level pressure and sea ice redistribution. The study suggests that distant regional conditions can have far-reaching effects on Antarctic climate change.
New publications in Geosphere examine the Colorado River system, sea-level change, and Grenville geology. Researchers used LiDAR technologies to study lava flows and deformation of the Reelfoot rift, providing insights into regional structure and geological processes.
A deep-sea core from Okinawa Trough has provided a 200,000-year record of Quaternary environmental changes, with high percentages of sedge and grass in glacial intervals indicating shortened offshore distance. The study highlights the impact of global ice volume, sea-level changes, and monsoon variability on sediment sources.
A team of researchers from the University of Sheffield found that unusual atmospheric jet stream circulation caused the exceptional surface melt of the Greenland Ice Sheet in summer 2012. The analysis revealed a record surface melt extent of over 90%, far exceeding the previous record of 52% in 2010.
A new study models active topography using mantle convection simulations, finding dynamic topography and glacial adjustment account for the region's coastal plain architecture. This has implications for inferences of global long-term sea-level change.
Richard B. Alley, a renowned geoscientist, has been awarded the AAAS Public Engagement in Science Award for his outstanding contributions to popularizing climate science. His work has helped demonstrate that past regional to global climate changes occurred rapidly and significantly impacted the environment.
The research team will develop an integrated model of coral reef development to link climate change, sea level, tectonics, and reef growth rates. The findings will provide a record of tropical climates and coral reef growth.
Researchers found drastic changes to marine communities due to higher temperatures and lower oxygen levels, leading to potential extinction of marine life. The study mirrors current climate predictions over the next century, highlighting the need for urgent action.
Experts argue that uncertainty about climate change impacts should not delay decision-making on adaptation measures. The costs of adapting to climate change include infrastructure upgrades and risk reduction strategies.
A study published in PNAS found that tropical cyclones have been increasing in frequency since 1923, correlating with rising global temperatures. The research used monitoring stations along the Eastern Seaboard of the US to track changes in sea levels and storm surges.
A Simon Fraser University professor will present on how climate change is expected to impact historical sea level changes in the Pacific Northwest. The talk highlights the vulnerability of low-lying coastlines in the region, particularly those with large human populations and infrastructure.
Researchers examine the link between climate warming and mass extinctions, revealing a direct consequence of Siberian trap volcanism. They also document land-based magnetic lineations similar to those found in sea-floor spreading centers and provide evidence for river drainage system rearrangement linked to ancient civilizations.
A new study reveals that ancient global carbon, sulfur cycles, and sea-level changes drove the evolution of marine life over 500 million years. The research found a strong connection between these factors and marine biodiversity.