Category:Ocean Science
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2023
Earth's Oceans Are Warming -- With Profound Impacts on Life
Ninety percent of global warming is now estimated to be occurring in the ocean... the consequences are rippling through earth's watery eco-systems....
The effects of ocean warming include sea level rise due to thermal expansion, coral bleaching, accelerated melting of Earthβs major ice sheets, intensified hurricanes, and changes in ocean health and biochemistry delivering destruction and extinction
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- Via UNEP | https://nbfn.no/into-the-blue-kelp/
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Improved Quantification of the Rate of Ocean Warming
July 15, 2022
Read full article at Journal of Climate, Published Online
Abstract
The increased concentrations of greenhouse gases in the atmosphere create an increase in Earthβs thermal energy, which is mainly stored in the ocean. Quantification of the rate of increase in ocean heat content (OHC) is vital for understanding the current and future climate of Earth. Linear trend lines have been frequently used to quantify long-term rates of change, but are inappropriate because they cannot capture nonlinearity in trends, have large start- and end-point sensitivity, and the assumption of linearity is nonphysical. Here observed and model-based linear regressions with higher-order polynomial (quadratic), piecewise linear, and locally weighted scatterplot smoothing (LOWESS) are compared. Piecewise linear and LOWESS perform best in depicting multidecadal trends. It is shown that linear rates are valid for up to about 15-yr segments (i.e., it is valid to compute linear rates within a 15-yr time window). Using the recommended methods, ocean warming for the upper 2000 m increases from about 0 to 0.06 Β± 0.08 W mβ2 for 1958β73 to 0.58 Β± 0.08 W mβ2 for 2003β18, indicating an acceleration of ocean warming that happens in all four ocean basins and from near the sea surface to 2000 m. There is consistency between multimodel-mean historically forced climate models and observations, which implies that the contribution of internal variability is small for global 0β2000 m OHC. Notable increases of OHC in the upper ocean (i.e., 0β300 m) after about 1980 and the deeper ocean (300β2000 m) after the late 1980s are also evident. This study suggests alternative methods to those currently used to estimate ocean warming rates to provide a more accurate quantification of long-term Earthβs energy changes.
Significance Statement
Quantifying long-term rates of change is needed to understand the time evolution of ocean warming and to assess the changing ocean and Earthβs energy budgets. Linear trend lines have been frequently used but cannot capture nonlinearity in trends, and have large start- and end-point sensitivity. Based on an analysis of the statistical features of ocean heat content time series, this study proposes two alternative methods to quantify the rates of change, including piecewise linear fit and LOWESS. Robust increases in warming for the upper 2000 m detected through observational records and climate models from 1958 to 2020, indicate a robust acceleration of ocean warming. Slow penetration of heat from the upper ocean into the deeper ocean is also evident.
Abstract-Significance Statement made available via Fair Use
Full article Β© 2022 American Meteorological Society
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Report for a Sustainable Ocean Economy
Ocean Solutions that Benefit People, Nature and the Economy
The raw numbers are sobering: ocean waters have absorbed 93 percent of the excess heat caused by greenhouse gas [GHG] emissions and sea surface temperatures have increased by 0.7Β°C since 1900. New analysis confirms that 2019 was the warmest year on record for ocean temperature, and saw the largest single-year increase of the decade. The 12 years with lowest Arctic sea ice extent all happened in the past dozen years140, and 2017 marked the lowest Antarctic sea ice extent on record.
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Science on the Seas (SOS)
The 'Tiny Little Ones'
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Microplastic Pollution Across World Oceans
'Ginormous' Disaster in the Making
"Plastic Particles may outnumber zooplankton, which underpin marine life and regulate climate"
Microplastics have entered the food chain in rivers, with birds found to be consuming hundreds of particles a day via the aquatic insects on which they feed.
Microplastic pollution has contaminated the whole planet, from Arctic snow and mountain soils to many rivers and the deepest oceans. It is also being consumed and inhaled by people, and the health impacts are as yet unknown.
Research published in the last month in the Journal of 'Environmental Pollution' has found microplastics in greater quantities than ever before on the seabed and suggested that hundreds of thousands of tonnes of microplastics could be blowing ashore on the ocean breeze every year...
The Rise of the Jellyfish
Invasion across the oceans of the world
After roaming the oceans for more than a half billion years, jellyfish may finally be poised to overtake Earth's largest bodies of water. A combination of pollution and warming is fostering a perfect environment for the alien-looking creatures to rule the seas.
Thousands of species fall under the jellyfish umbrella, similar only in their basic body composition and tendency in undergoing sudden population booms. Some scientists use the term βgelatinous zooplanktonβ... Jellyfish may finally be poised to overtake Earth's largest bodies of water.
'Jellymageddon': Can we stop the rise of the jellyfish?
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Seagrass: A 'Secret Weapon' Against Global Heating
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Molecular Understanding of Ocean Warming
Peter G. Brewer
July 2019
A grand challenge for ocean chemists in the years ahead lies in the need to tackle the chemical consequences of ocean warming with the same rigor and intensity that has been brought to bear on the physical chemistry of ocean acidification...
The ocean absorbs some 93% of all greenhouse gasβgenerated heat, and ocean warming is already creating observable impacts on marine life. To make reliable projections for the future, we cannot rely on Ptolemyβlike rules, built as something to match field observations, to apply in the years to come. Instead, we will need to apply the laws of chemical physics to calculate and predict the changes that ocean warming will have on the physical properties of sea water and the associated impacts on marine life. This includes treating water as a fluid with defined temperatureβand pressureβdependent chemical structures.
Sea water is 96.5% water, and some 78β85% of water in the oceans has a form with a much higher molecular weight than the water molecule that typically comes to mind, with a single oxygen and two hydrogens. These varied structures are now directly relatable to the high heat capacity of water, why the speed of sound is faster in warmer water, and the viscosity of sea water that provides constraints on microbial motion. Microbial activity is a key driver to the amount of oxygen in different parts of the ocean, and if their activity is affected by increased warmth, it seems quite possible that large regions may exist with no oxygen at all. Marine life responds strongly to changing oxygen status. This is because both warmer waters can hold less oxygen, and because warming drives higher rates of microbial growth.
Marine fisheries, and the great majority of all marine species, are already responding to these forces and are migrating toward cooler waters near the poles. Using known laws of science to connect chemistry, physics, and ocean warming would allow the ocean sciences to proceed on firmer footing and to improve future projections of the impact of ocean warming. The ocean is now experiencing the twinned invasions of heat and fossil fuel carbon dioxide that drive up its acid level. It is the combined impact of these two great waves, both resulting from our use of fossil fuels, that will be critical...
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Seaweed, not just seaweed but a 'Sea of Seaweed'
Warming oceans produce abundant 'weed'
Satellites tracking 'the weed'
- Satellites in Space Spot Largest Seaweed Bloom on Earth
The great Atlantic Sargassum belt
Floating mats of Sargassum seaweed in the center of the North Atlantic were first reported by Christopher Columbus in the 15th century. These mats, although abundant, have until recently been limited and discontinuous. However, Wang et al. report that, since 2011, the mats have increased in density and aerial extent to generate a 8850-kilometer-long belt that extends from West Africa to the Caribbean Sea and Gulf of Mexico. This represents the world's largest macroalgal bloom. Such recurrent blooms may become the new normal.
Seaweed, seaweed everywhere
Millions of tonnes of floating Sargassum seaweed in coastal waters smother fragile seagrass habitats, suffocate coral reefs and harm fisheries. And once washed ashore on Mexican and Caribbean beaches, this foul-smelling, rotting seaweed goes on to devastate the tourist industry, prevent turtles from nesting and damage coastal ecosystems, while releasing hydrogen sulphide and other toxic gases as it decomposes.
Seaweed blooms are exacerbated by fertilisers washing into the ocean, as well as by warming sea temperatures. βSargassum blooms on the Atlantic gyre [tidal current] have got much worse in recent years partly due to increasing intensive agriculture discharging fertiliser into the sea via rivers such as the Mississippi and Amazon,β says Prof Mike Allen, of the University of Exeter and Plymouth Marine Laboratory. βFertiliser makes the seaweed grow faster and this influx of biomass just shouldnβt be there in that abundance β itβs out of control.β
Sargassum: The biggest seaweed bloom in the world
Sargasso Sea (video) from the Smithsonian Channel
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Monitoring Earth's Oceans from Space
- Will the new availability of sophisticated, satellite-based technologies, coupled with the democratization of online data about the health of our environment, help ensure that these positive advancements live up to their potential to protect the oceans?
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"What percentage of the Earth is covered by oceans?"'
71% -- Via http://www.noaa.gov/oceans-coasts
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Phytoplankton & Photosynthesis
Plankton: The Ocean Food Chain & Atmospheric Oxygen
"Tiny Blue Green"
- More than Meets the Eye
"A single kind of blue-green algae in the ocean produces the oxygen in one of every five breaths we take"
- ~ from "The World Is Blue: How Our Fate and the Oceanβs Are One" by Sylvia Earle
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Impacts of Ocean Warming /AGU Science - Geophysics
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Visit:
www.tinybluegreen.com @GreenPolicy360
Seventy percent of the Earth's surface is ocean and here, in myriad life forms, "tiny blue-green" organisms are essential to preserving life on the planet.
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Join in Planet Scientists, do some difference-making Citizen Science
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Sea-Level Rise
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Mapping & Tracking
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Open Science Access to Ocean Research
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Global Impacts of Ocean Acidification and Warming
- To gather a more comprehensive understanding of the condition of global reef ecosystems, we need a way to assess and monitor them on a large geographic scale.
- The Reefscape project aims to improve our understanding of the condition of coral reefs worldwide, while simultaneously developing spectral libraries needed to advance the development of a new satellite mission.
- New satellites, such as those from Planet (formerly Planet Labs), are, as of 2017, able to capture near-daily imagery of coral reefs worldwide. Planetβs high-resolution imagery of reef locations provides new imaging, science and understanding of the composition and extent of shallow, horizontally oriented reefs.
Reefs and Coral, sentinel species
Coral reefs in peril as ocean environment is transformed
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Ocean Research Missions - http://schmidtocean.org/
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Subcategories
This category has the following 21 subcategories, out of 21 total.
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Pages in category "Ocean Science"
The following 99 pages are in this category, out of 99 total.
A
C
- Carbon Brief
- Citizen Science
- Climate Change - Global Warming Keyword-Terms
- Climate Change Denier Talking Points -- and Rebuttals
- Climate Change Summit Paris
- Climate Desk
- Climate Law Blog @Columbia Law School
- Climate migration
- Climate News
- Climate News Events Archive ... 1970 to Today
- Climate Plans Enforcement - Resources
- Copernicus EU
E
- Earth and Space, Politics
- Earth at Night
- Earth from NASA
- Earth Imaging-New Space
- Earth Right Now
- Earth Science
- Earth Science Eco-Fields
- Earth Science Research from Space
- Earth Science Vital Signs
- EarthTime
- Ecolivia
- Environmental agreements
- Environmental movement
- Environmental protection
- Environmental Rules Rolled Back
- ESA Living Planet Announcement - May 2022
- Ethics and Climate Change
- European Union Green Deal - Fit for 55
- Extinction
- ExxonMobil and US House Science Committee v US Attorneys General and Environmental Groups
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- Glasgow Climate Summit - Pledges, Promises, Declarations - What's Next Up
- Global Climate Action Summit
- Global Fishing Watch
- Global warming
- Google Earth
- GP360 NewPages
- Green Marketing
- Green Stories of the Day
- Green Stories of the Day - GreenPolicy360 Archive
- GreenPolicy360 Archive Highlights 2013
- GreenPolicy360 Archive Highlights 2014
- GreenPolicy360 Archive Highlights 2015
- GreenPolicy360 Archive Highlights 2016
- GreenPolicy360 Archive Highlights 2017
- GreenPolicy360 Archive Highlights 2018
- GreenPolicy360 Archive Highlights 2019
- GreenPolicy360 Archive Highlights 2020
- GreenPolicy360 Archive Highlights 2023
- GreenPolicy360 Highlights
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Media in category "Ocean Science"
The following 200 files are in this category, out of 846 total.
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