Marianne Hagen’s Post

Warming of Antarctic deep-sea waters contribute to sea level rise in North Atlantic, study finds - University of Miami Rosenstiel School of Marine, Atmospheric and Earth Science: Analysis of mooring observations and hydrographic data suggest the Atlantic Meridional Overturning Circulation deep water limb in the North Atlantic has weakened. Two decades of continual observations provide a greater understanding of the Earth’s climate regulating system. https://lnkd.in/eiVSFtpd

#Mars once had water-filled rivers, but the climate did not have to be warm--new research from Peter Buhler out of the Planetary Science Institute (where I also work!) shows that ice-capped rivers can explain Mars' water-eroded landscape with a very cold #climate. https://lnkd.in/etV4zQHz

Study Challenges Previous Assertions of Gulf Stream Slowdown A new study by scientists at the Cooperative Institute for Marine and Atmospheric Studies (CIMAS), the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science, NOAA's Atlantic Oceanographic and Meteorological Laboratory (AOML), and the National Oceanography Centre found that the strength of the Florida Current, the beginning of the Gulf Stream system and a key component of the global Atlantic Meridional Overturning Circulation, or AMOC, has remained stable for the past four decades. There is growing scientific and public interest in the AMOC, a three-dimensional system of ocean currents that act as a "conveyer belt" to distribute heat, salt, nutrients, and carbon dioxide across the world's oceans. Changes in the AMOC's strength could impact global and regional climate, weather, sea level, precipitation patterns, and marine ecosystems. In this research, measurements of the Florida Current were corrected for the secular change in the geomagnetic field to find that the Florida Current, one of the fastest currents in the ocean and an important part of the AMOC, has remained remarkably stable over the past 40 years. The study published in the journal Nature Communications, the scientists reassessed the 40-year record of the Florida Current volume transport measured on a decommissioned submarine telecommunications cable in the Florida Straits, which spans the seafloor between Florida and the Bahamas. Due to the Earth's magnetic field, as salt ions in the seawater are transported by the Florida Current over the cable, a measurable voltage is induced in the cable. The cable measurements were analyzed together with measurements from regular hydrographic surveys that directly measure the Florida Current volume transport and water mass properties. In addition, the transport was inferred from cross-stream sea level differences measured by altimetry satellites. Continue reading: https://lnkd.in/g2pqPzYv About CASE Consultants International: CASE Consultants International specializes in providing expert guidance in climate adaptation, resilience planning, and environmental justice. CASE is dedicated to helping organizations and communities navigate the complexities of climate change to build a sustainable, resilient future.

I am very happy to announce that I am convening a session on "Interactions between atmosphere and ocean dynamics in the extra-tropics" at European Geosciences Union (EGU)'s 2025 General Assembly in Vienna, that will be held from 27th April to 2nd May 2025. My colleagues Sayanthani Ojha and Joakim Kjellson (GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel), Rune Graversen (UiT- The Arctic University of Norway), will also be part of this daring endeavor! The session is organized within the Climate Division program, jointly with Ocean Sciences(OS), Atmospheric Sciences (AS) and Nonlinear Processes (NP) programs. If you are willing to present your contribution to this session, and consider it falls within your area of interest, you may submit your abstract here: https://lnkd.in/eA_QAzSw The deadline for submission is 15th January 2025 at 13:00 CET. Abstract The dynamics of the atmosphere in the extratropics is characterized by the coexistence of multiple fundamental processes spanning a variety of spatio-temporal scales. The interactions between the atmosphere and the oceans are central to several of these, while the interaction with sea-ice also plays a major role in high latitudes. The thermal contrast between the ocean and land surface, the different thermal inertia of the ocean and the atmosphere, and the moisture and heat exchange between the two are important for the general circulation of the atmosphere and oceans, and indicate that both a thermodynamic and a dynamic perspective are needed for understanding this topic. For example the oceanic anomalies, through air-sea interactions, affect the atmospheric dynamics already at the weather scales, and the atmosphere can quickly transfer anomalies towards remote areas, as in the case of diabatic heating along frontal zones. Atmospheric rivers originating over oceanic surfaces affect the formation of synoptic systems in the mid-latitudes and trigger climate extremes. Careful understanding of these mechanisms is crucial, especially regarding the assessment and predictability of extreme events, and the capability to discern the impacts of anthropogenic climate change on the variability of the climate system. We welcome all contributions on the interactions between the oceanic and atmospheric circulation. These include investigations of atmosphere – ocean dynamics and thermodynamics at hemispheric and regional scales, including the role of sea-ice, and both weather and climate timescales. We also encourage submissions that address and compare different methodologies, e.g. detection of dominant patterns or weather regimes, dimensionality reduction involving traditional techniques such as PCA and EOFs, or new methods such as random forest or other AI-based algorithms. Model intercomparisons, and evaluations of past and future climate projections, are also welcome.

Summary statement of two recent workshops on the topic of ice interventions / glacial geoengineering can be found here: https://lnkd.in/d8Uq2cX5 I am very skeptical, in particular given the insentive now for big investments into engineering solutions, the lack of scientific knowledge, and the lack of understanding of the consequences. Not to mention the belief in this as a solution to the climate crisis - risking urgent climate action and emission reductions. Question now is how should the scientific community engage in a meaningful and constructive way? See also todays The International Glaciological Society webinar and discussion with Doug MacAyeal.

A landslide in remote Greenland caused a mega-tsunami, generating vibrations throughout Earth for nine days, according to an international team co-led by Dr Stephen Hicks (UCL Earth Sciences) with Dr Kristian Svennevig (GEUS). Watch this captivating video by Dr Hicks to understand the magnitude of this event: https://lnkd.in/ezvsJ8Zz Find out more about this climate change-induced phenomenon: https://lnkd.in/efedKTMx #EarthScience #UCLResearch #ClimateChange

One min Read: Study reveals acceleration in Pacific upper-ocean circulation over past 30 years, impacting global weather patterns A critical ocean layer for El Niño–Southern Oscillation (ENSO) dynamics. A study published on October 31, 2024, in the Journal of Geophysical Research: Oceans shows that the equatorial Pacific's upper-ocean circulation has accelerated over the past 30 years due to stronger atmospheric winds. This has led to faster, shallower currents and may affect global climate patterns, especially El Niño and La Niña events. Led by Franz Philip Tuchen at the University of Miami, the research combines three decades of ocean and atmospheric data, revealing a 20% increase in westward currents and a significant acceleration of poleward currents. The equatorial thermocline has steepened, potentially reducing ENSO amplitude and favoring more frequent central Pacific El Niño events. These findings could improve climate models and enhance predictions for regions affected by ENSO, like the U.S. Source: https://lnkd.in/dBJh6PU9 #OceanCirculation #ElNino #LaNina #ClimateChange #EquatorialPacific #ENSO #ClimateScience #GeophysicalResearch #Oceanography #GlobalWarming #PacificCurrents #AtmosphericWinds #ClimateModels #EnvironmentalScience

❄ New research shows how the Southern Annual Mode's (SAM) influence on surface melt varies across East Antarctica due to its effect on local weather conditions, such as temperature, snowfall, wind speed, and cloud cover. The study, led by PhD candidate Dominic Saunderson and published in Geophysical Research Letters, could help improve future projections of East Antarctica's contribution to sea level rise. 🌊 It shows in Wilkes Land that a negative SAM corresponds to warmer air temperatures 🌡 , heating the surface and leading to more melting. However, in Dronning Maud Land, a negative SAM is associated with less snowfall 🌨 and, therefore, darker surfaces ◼ , which absorb more sunlight ☀ and cause more surface melt. The paper, published in Geophysical Research Letters, was co-authored by Monash University-based SAEF researchers Prof Andrew Mackintosh, Dr Felicity McCormack, and Dr Richard Selwyn Jones. Read more: https://lnkd.in/gpZJ5F84 #SouthernAnnularMode #SAM #Antarctica #surfacemelt #EastAntarctica #climatemodelling

Check out our recent publication about synoptic mechanisms controlling fog and low clouds frequency across the Chilean coast. Highlights • Fog and low clouds's behaviour show an asymmetric spatiotemporal variability. • Thermal inversion is the main mechanism controlling fog and low clouds's variability. • El Nino has a stronger influence than La Nina in fog and low clouds's variability. • Fog and low clouds's presence are likely to increase due to climate change. Free access up to August 4th, 2024 https://lnkd.in/e-i5z-de

NOAA oceanographer Tim Boyer (Ph.D. '24, atmospheric and oceanic science) tracks subsurface ocean changes important to Earth's climate and serves as co-editor for the State of the Climate, one of the most comprehensive reports on the Earth's physical environment. “What I learned [at the University of Maryland] really helped me to understand the big picture, so I could edit any section of the State of the Climate—atmospheric, land or ocean—and see how it all fit together," Tim said. go.umd.edu/boyer #StateOfTheClimate #NOAA #Climate #Oceanography #PhD #ScienceTerp #UMD Atmospheric and Oceanic Science @ UMD, NOAA: National Oceanic & Atmospheric Administration