11AM AST Sep 5: Tropical Depression 13 forms in the Central Atlantic, forecast to become a powerful hurricane by the end of the week. Interests in the Leeward Islands should monitor the progress of this system at hurricanes.gov

National Hurricane Center

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Scientists have long assumed that #NationalParks help conserve #wildlife and protect biodiversity... But is that truly the case? 🌳 🐆

A new study from the @umontana in collaboration with international researchers answers this question ⬇️ buff.ly/3sqHJTB

Red List of Ecosystems

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Tropical Depression Thirteen has formed in the Atlantic.

This system is likely to become a hurricane over the next several days.

CIRA

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Today's event at the #AfricaClimateSummit23 with @bankimooncentre:

'#ClimateFinance for Adaptation in Agriculture & Food Security in Africa'

Highlighted urgency to multiply finance flows, towards inclusive climate adaptation efforts in agrifood systems, to achieve Zero Hunger

FAO Climate Change & Biodiversity

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Today is #WorldAmazonDay! It is home to about 10% of the planet's known species and more than 40 million people. Not only is the Amazon vital for people and wildlife, but it also helps stabilize the local and global climate and stores 150-200 billion tons of carbon.

World Wildlife Fund

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What are #NaturebasedSolutions and what global challenges can they help with?

Learn more ➡️ shorturl.at/wyzAV

IUCN

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RT @ForestPeoplesP: This #AmazonDay, we look at how the @NacionWampis in #Peru are conserving and caring for their lands. #IndigenousPeoples and #LocalCommunities play a key role in conserving the #AmazonRainforest.

Find out more in this short film: localbiodiversityoutlooks.ne… @UNBiodiversity

UN Biodiversity

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RT @NOAANCEI: Was this the hottest summer on record? What was the weather like on my birthday? You've got questions, ACIS has answers! Check out how #RCCACIS came to be and learn about the features it provides. bit.ly/ACIS_RegionalClimateC… #RCC40th

NOAA Climate.gov

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RT @UNESCO: .@UNESCO #WorldHeritage sites are home to up to 1/3 of the remaining elephants, tigers & pandas globally! These sites work to safeguard the lives of these communities. For some species on the brink of extinction these sites are the last line of defence. on.unesco.org/biodiversityco…

UN Biodiversity

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RT @MathaiWanjira: Some great outcomes we’ve seen from @WRIAfrica today at #ACS23

🤝 Africa-Europe partnership for green investment

🌳 $23m for locally led restoration in the Rift Valley & the Rusizi Basin from @BezosEarthFund

🔧 Sharing solutions to finance African led adaptation #AFR100

WRI Climate

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RT @AniDasguptaWRI: Africa is charting a bold path to provide solutions for the global climate crisis.

The @AfClimateSummit is a pivotal moment to set a vision for low carbon green growth and spur climate action throughout the continent and the world.

See what to watch: bit.ly/44s7hgk

WRI Climate

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Scientists assess the impacts of a warming ocean
With global average sea surface temperatures at record highs, ocean scientists associated with the WMO co-sponsored World Climate Research Programme have made a collective assessment of recent global trends and what may be expected in the future. This includes an observed basin-wide warming of the ocean and an increase in marine heatwaves.

Marine heatwaves occur when ocean temperatures in a given region are well above average for an extended period of time. Warmer ocean temperatures impact the marine environment and associated ecosystems, and ocean heat can also fuel developing tropical cyclones.

What’s behind the widespread extent of recent marine heatwaves?

Global monthly-mean ocean temperatures are currently at an all-time high relative to temperatures since the start of the instrumental record and potentially extending even further into the past, with 27% of the global ocean experiencing a marine heatwave as of August 15, 20231. The World Meteorological Organization recently announced that El Niño conditions have developed for the first time in seven years. Tropical Pacific surface temperatures are warmer during El Niño years as upper ocean heat content is redistributed from west to east across the Pacific, explaining the intense warming developing in the eastern equatorial Pacific. Besides the tropical Pacific, a recent study has shown that the most widespread marine heatwaves have occurred during major El Niño events. A region particularly affected by El Niño is the Northeast Pacific, which is also currently undergoing extremely warm conditions.

Other compelling reasons could explain recent warming in other regions. For example, the North Atlantic has experienced a sequence of marine heatwaves extending from the tropics to mid-latitudes. This warming pattern is consistent with the negative phase of the North Atlantic Oscillation, a natural pattern of atmospheric variability that can impact surface winds and influence ocean temperatures. The North Atlantic Oscillation was strongly negative from mid-April to mid-May 2023 and most of July, consistent with the observed Atlantic warming pattern. During this negative phase, less Saharan dust is blown over the tropical Atlantic Ocean, allowing more sunlight to reach the surface and warm the ocean. It is possible that there are additional local drivers of ocean warming. However, more data and research are needed to definitively identify the specific mechanisms of current marine heatwaves in different regions.

In addition to mechanisms related to natural variability of the climate system, we know that about 90% of the excess heat associated with global warming has been absorbed by the ocean, causing the global ocean surface temperature to increase by about 0.9°C since pre-industrial times. This long-term warming manifests as an intensification and persistence of ocean temperature extremes, by exacerbating the impact of internal climate variations like El Niño and the North Atlantic Oscillation. Therefore, it is very likely that climate change has contributed to the intensity and widespread coverage of current marine heatwaves.

How long will these m[...]

arine heatwaves last?

Long-range seasonal forecasts and experimental marine heatwave forecasts predict continuing widespread warming over the coming months. Regionally, the latter forecasts indicate that marine heatwaves in the tropical Atlantic have a 50-80% chance of persisting into boreal winter 2023, although confidence in these forecasts generally decreases with increasing lead time. Additionally, models predict an elevated risk of marine heatwave conditions along the US west coast in boreal spring 2024 as the current El Niño continues to strengthen, since events usually peak in austral summer. See the full report for a breakdown of additional regions.

Impacts

Each year, marine heatwaves impact marine ecosystems around the globe, resulting in billions of US dollars in damages to marine ecosystems and to industries such as fisheries or tourism. During summer, marine heatwaves cause heat stress on a large variety of marine species including foundation species like seagrass, kelp and corals, with El Niño marine heatwave conditions particularly impactful on these species globally. For example, coral reefs off the Florida Keys have experienced an unprecedented level of coral bleaching this year. Aside from ecosystems, ocean heat is an important fuel source for developing tropical cyclones. Marine heatwaves in the tropical Indian Ocean contribute to rapidly intensifying cyclones and fluctuations in the monsoon rainfall. Extreme warming in the tropical Atlantic could contribute to stronger storms, although the influence of El Niño on upper-level winds may counteract the effect of the warm surface temperatures.

Due to ongoing global warming in response to unabated greenhouse gas emissions, instances of extreme ocean warming are projected to further increase in frequency, duration, and intensity. If dramatic mitigation and adaptation efforts do not occur, then each increment of future warming may lead to severe impacts on biodiversity, structure and function of marine ecosystems.

This assessment was made by the Marine Heatwaves in the Global Ocean Research Focus of the Climate and Ocean Variability, Predictability and Change (CLIVAR) Core Project of the World Climate Research Programme. The goal of the Research Focus is to achieve a better understanding of marine heat waves globally, including detection, surface and subsurface characteristics, mechanisms, connection with climate change and biogeochemical extremes, in order to increase preparedness and promote efficient adaptation planning, while contributing to the training of the next generation of scientists and providing input to observational programs.

Contact: Prof. Regina Rodrigues, regina.rodrigues@ufsc.br
Language
English

Featured Media

WCRP: ocean scientists assess marine heatwaves

Type of news

News

Publish Date

Tuesday, September 5, 2023 - 17:30

Tags

Oceans

Climate change

Editorial Section

CPA

Contact

CNullis

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The new@IPBES #InvasiveAlienSpecies report is a vital tool in reaching#KMGBF Target 6, paving the way to#BuildBackBiodiversity . Congratulations to#IPBES10 and thanks to the authors.
We did it! #IPBES10 🎉👏

📢@IPBES #InvasiveAlienSpecies Report has been approved by our 143 member States ‼️

🔍Get ready to discover the main insights!

Stay tuned for the Media launch: 4 Sep 📣⤵️

bit.ly/IASWebcast-ipbes

UN Biodiversity

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Yesterday, a massive#SaharanDust storm hit western Europe.

As shown in this 9-hour#TimelapseTuesday imagery from Europe's#Meteosat9 satellite, the dust cloud moved northward from Africa, blanketing the skies of Spain and France, before reaching the Atlantic Ocean.nitter.salastil.com/NOAASatellites/s…

NOAA Satellites

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Sep 5: AL95 became T.D. Thirteen this morning and is forecast to become a major hurricane by this weekend. Current peak seas are 9 ft within 180 nm N of the center, but expected to build to 12 ft by this evening. Mariners should monitor this system and updates to the forecast.nitter.salastil.com/NHC_TAFB/status/…

NHC_TAFB

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Erratic weather patterns increasingly keep farmers up at night.

In Zambia, once predictable farming cycles have become a gamble.

Farmers like Lesi, however, are beating the challenges.#AfricaClimateWeek ow.ly/LwVM50PHzGw

UNDP Climate

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What new@NASAEarth science datasets were released in August 2023? Find out in the September NASA Earth Science Data Roundup highlighting some of the latest data and product releases from NASA's data archive centers.go.nasa.gov/3qZNRl9 #OpenScience

NASAEarthdata

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Celebrate the Cartagena Protocol's 20th anniversary with us! 🎉#20YearsBiosafety

💻 Join our expert webinar at 7am EDT for key insights and upcoming collaborations.

🚨 Register by Sept 10:zoom.us/webinar/register/WN_…

💡Details:bch.cbd.int/protocol/20thann…

UN Biodiversity

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