Southern Ocean storms cause outgassing of carbon dioxide

Storms over the waters around Antarctica drive an outgassing of carbon dioxide into the atmosphere, according to a new international study with researchers from the University of Gothenburg. The research group used advanced ocean robots for the study, which provides a better understanding of climate change and can lead to better global climate models.

The world's southernmost ocean, the Southern Ocean that surrounds Antarctica, plays an important role in the global climate because its waters contain large amounts of carbon dioxide. A new international study, in which researchers from the University of Gothenburg participated, has examined the complex processes driving air-sea fluxes of gasses, such as carbon dioxide.

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Fears for Great Barrier Reef as scientists discover first signs of bleaching

Coral on the Great Barrier Reef is showing early signs of bleaching, which has experts concerned as the Sunshine State is staring down the barrel of a long, hot summer.

A team of research scientists have documented pale and fully-bleached coral — which occurs when symbiotic algae inside hard coral is expelled — off the coast of Magnetic Island in Far North Queensland on Sunday.

They're concerned, as this could be the first signs of a "widespread" die-off at the World Heritage site.

If it proves true it would be the sixth mass bleaching event on the reef since 1998.

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Shift work helps marine microbes share scarce ocean resources

Though they may be small, microorganisms are the most abundant form of life in the ocean. Marine microbes are responsible for making roughly half of the organic carbon that's usable by life. Many marine microbes live near the surface, depending on energy from the sun for photosynthesis. Yet between the low supply of and high competition for some key nutrients, like nitrogen, in the open ocean, scientists have puzzled over the vast diversity of microbial species found there. Researchers from the University of Washington, in collaboration with researchers from 12 other institutions, show that time of day is key, according to a study published Jan. 20 in Nature Ecology & Evolution.

https://phys.org/

Announcement: GlobalHAB. 2021. Guidelines for the Study of Climate Change Effects on HABs.Paris, UNESCO-IOC/SCOR. M. Wells et al. (eds.) (IOC Manuals and Guides no 88). Editorial Board: Wells, M.L., Burford, M., Kremp, A., Montresor, M. and Pitcher, G.C.

HAB science today is founded on studies dealing with a great diversity of topics and harmful organisms, using a variety of continuously evolving experimental methods and approaches.

The major aim of these GlobalHAB guidelines cosponsored by SCOR, IOC UNESCO, PICES and ICES,  is to communicate standardized strategies, tools, and protocols to assist researchers studying how climate change drivers may increase or decrease future HAB prevalence in aquatic ecosystems.

These guidelines represent a first step that will help inform HAB scientists, students, and researchers entering the field, as well as scientists seeking to incorporate HAB studies into existing and developing ocean and freshwater observing systems.

http://dx.doi.org/10.25607/OBP-1692 and https://oceanexpert.org/document/29762

 

 

Satellites show 'mega-iceberg' released 152 billion tons of fresh water into ocean as it scraped past South Georgia

152 billion tons of fresh water—equivalent to 20 times the volume of Loch Ness or 61 million Olympic-sized swimming pools, entered the seas around the sub-Antarctic island of South Georgia when the megaberg A68A melted over three months in 2020/2021, according to a new study.

In July 2017, the A68A iceberg snapped off the Larsen-C Ice Shelf on the Antarctic Peninsula and began its epic 3.5-year, 4,000-km journey across the Southern Ocean. At 5719 square kilometers in extent—one-quarter the size of Wales—it was the biggest iceberg on Earth when it formed and the sixth largest on record. Around Christmas 2020, the berg received widespread attention as it drifted worryingly close to South Georgia, raising concerns it could harm the island's fragile ecosystem.

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China seeks to expand strategic ties with African Indian Ocean states

The inclusion of the Comoros Islands on the itinerary of Chinese foreign minister Wang Yi’s latest Africa visit highlights the heightened importance that Beijing places on the Indian Ocean states of the continent, which have often sought India’s assistance as the net security provider in the region.

Last year, Wang went to the Seychelles and after Comoros, he will head to the Maldives and Sri Lanka — in India’s neighbourhood in the Southern Indian Ocean Region.

China increasing ..

Read more at:https://economictimes.indiatimes.com/