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Climate change has already impacted about half of Indian Ocean basin

Published

5 years ago

2020/08/25

Sahan Weerasooriya

File photo of people wading through flood water in a Colombo suburb

Half of world’s oceans already affected by climate change

The world’s oceans have turned into a veritable sponge for our emissions, and new climate models suggest we’ve soaked them right through, said a report published by the Science Alert news service yesterday.

Since the 1950s, our planet’s vast bodies of water have absorbed roughly 93 percent of the energy entering the climate system, and while most of that heating has been observed near the ocean surface, rising temperatures are now permeating even the deepest parts, ScienceAlert reported.

The report filed from Tehran said: Real-world data on the deep ocean is hard to come by, but a new estimate, based on recent measurements and nearly a dozen climate models, suggests climate change has already impacted up to about half (20 to 55 percent) of the Atlantic, Pacific, and Indian Ocean basins.

What’s more, in just six decades, these human-induced changes in temperature and salinity could very well spread to 80 percent of the world’s oceans.

“We were interested in whether the levels of temperatures and salt were great enough to overcome natural variability in these deeper areas,” explains climate scientist Yona Silvy from Sorbonne University in France. “That is, if they had risen or fallen higher than they ever would during the normal peaks and troughs.”

Using temperature and salinity measurements from the deep ocean and plugging these into 11 current climate models, the team simulated ocean and atmospheric circulation over the years, with and without the contribution of human emissions.

During the second half of the 20th century, Silvy and her colleagues found human-induced warming was responsible for most observed ocean changes – “statistically” and “unambiguously” different from what would occur naturally. Because heat and salt impact ocean density and circulation, this could have widespread implications.

“This affects global ocean circulation, sea level rise, and poses a threat to human societies and ecosystems,” says Silvy.

Most of the time, heat and salt from the surface of the ocean are transported relatively slowly to the ocean’s interior, which means that many of the deepest parts experience a lag in human-induced changes.

Some deeper areas, however, circulate quicker, and thus respond faster to our emissions.

In the new model, for instance, the Southern Ocean, which is relatively well-ventilated, experienced human-induced changes quite quickly, showing up as early as the 1980s.

Meanwhile, in the Northern Hemisphere, oceans took a little longer to respond, with most changes calculated to appear sometime between 2010 and 2040.

Together, by 2020, the model shows somewhere between 20 percent and 55 percent of the world’s oceans had been altered by anthropogenic climate change.

By mid-century, these changes could make up 50 to 60 percent of the world’s oceans, and by 2080, 55 to 80 percent.

“This work suggests that a large portion of the observed change patterns in the ocean interior is human-induced and will continue to intensify with continuing CO2 emissions,” the authors write.

Plus, even if emissions are slowed, the lag in ocean circulation means we are locked in to a certain amount of change going forwards.

We still don’t fully understand the relationship between deeper changes to salt and heat and surface warming, or how these changes impact ocean circulation. It requires far more investigation, especially in the Southern Hemisphere where deep ocean data is few and far between, but investigate it we must.

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Warning for deep depression over South-east Bay of Bengal Sea area

Published

5 hours ago

2026/01/8

Priyan

Deep depression Track. [Source: RSMC]

Warning for deep depression over South-east Bay of Bengal Sea area.
Issued by the Natural Hazards Early Warning Centre, Department of Meteorology at 10.30 a.m. on 08 January 2026 for the period until 10.30 a.m. 09 January 2026

The depression in the Bay of Bengal to the southeast of Sri Lanka has intensified into a deep depression and is centered near latitude 5.4°N and longitude 85.3°E, about 420 km southeast of Pottuvil at 05.30 a.m. today (08th). The above system is currently (10:00 a.m.) located about 300 km southeast of Pottuvil.

It is very likely to move west-northwestwards across the southwest Bay of Bengal and cross the Sri Lanka coast between Hambantota and Kalmunai between 5.30 p.m. to 11.30 p.m. on Friday [9th January 2026].

Hence, showery, and windy condition over the island, particularly in the Northern, NorthCentral, Eastern, Uva and Central provinces is expected to enhance from today (08th).

For the Land area:

DAMAGE EXPECTED:
• Damage to huts, temporary shelters and light structures
• Destroy the roof tops/ sheets etc.
• Damage to power and communication lines.
• Breaking of tree branches and uprooting of large avenue trees.
• Damage to paddy crops, banana, papaya trees and orchards.
• Damage to harbor yachts
• Flash flood
• Sea water inundation in low lying areas in the near coast.

Action suggested for the Land area:
• Coastal hutment dwellers are advised to move to safer places. Other people in the affected areas to remain indoors.
• People living in hilly areas (particularly landslide prone areas) and low lying areas in river basins are requested to be vigilant.
• Drivers and people using roads in the hilly areas are requested to be vigilant.
• Beware of fallen trees and power lines.
• Avoid using wired telephones and connected electric appliances during thunderstorms.
• General public is requested to be vigilant regarding impending extreme weather situation.
• For emergency assistance contact the local disaster management authorities.
• Requested to be attentive about future advisories issued by the Department of Meteorology in this regard.

Latest News

Showers above 100 mm are likely at some places in the Eastern and Uva provinces and showers about 50-75 mm in other areas

Published

10 hours ago

2026/01/8

Priyan

WEATHER FORECAST FOR 08 JANUARY 2026
Issued at 05.30 a.m. on 08 January 2026 by the Department of Meteorology

The depression over the Bay of Bengal, located to the southeast of Sri Lanka, was centered near latitude 5.3°N and longitude 86.0°E, about 490 km southeast of Pottuvil, at 11:30 p.m. yesterday (07). It is expected to move west-northwestwards and towards the eastern coast of the island during next 24 hours. This system is likely to intensify further into a deep depression during the next 12 hours.

Cloudy skies can be expected over most parts of the island.
Showers or thundershowers will occur at times in the Northern, North-central, Eastern, Uva, Central and Southern provinces. Showers or thundershowers may occur at several places elsewhere in the Island after 1.00 p.m. Heavy showers above 100 mm are likely at some places in the Eastern and Uva provinces. Fairly Heavy showers about (50 – 75) mm are likely at some places in the other areas of the island.

Strong winds about (50-60) kmph can be expected at times over the Eastern slopes of the central hills, the Northern, North-central, North-western and Eastern provinces and in Hambantota, Gampaha, Colombo and Monaragala districts.

The general public is kindly requested to take adequate precautions to minimize damages caused by temporary localized strong winds and lightning during thundershowers.

News

Easter Sunday attacks: Govt. says wife of Katuwapitiya Church bomber alive

Published

11 hours ago

2026/01/8

Sahan Weerasooriya

Sara Jasmine

Minister of Public Security Ananda Wijepala told Parliament yesterday that information uncovered during ongoing investigations indicated that Pulasthini Mahendran, also known as Sara Jasmine, linked to the 2019 Easter Sunday terror attacks, was not dead.

Responding to a question raised by Opposition MP Mujibur Rahuman, the Minister said there was no confirmation that Sara Jasmine was currently in India, despite speculation to that effect. He added that investigators suspected she may have fled the country and stressed that further inquiries were underway to establish her whereabouts.

“If necessary, the government will take steps to obtain a warrant,” Wijepala said, noting that legal action related to the Easter attacks had already been initiated, based on available evidence.

Minister Wijepala said the new government had launched an thorough probe to determine whether a political or other conspiracy had been behind the attacks that killed more than 270 people in 2019. However, he declined to disclose certain details in Parliament, citing the risk of hampering investigations.

Sara Jasmine, Mohammed Hashtun, who bombed St. Sebastian’s Church, in Katuwapitiya, in 2019, was long presumed to have died in a suicide blast in Sainthamaruthu, days after the attacks. Wijepala said attempts by previous administrations to establish her death had failed, with recent reports indicating that DNA tests conducted at the time were inconclusive.

During the debate, MP Rahuman recalled that senior figures, including then-Opposition MP Nalinda Jayatissa, had previously claimed Sara Jasmine was in India. He questioned why authorities had not sought an open warrant for her arrest whether the issue had been raised in talks with Indian officials.

Wijepala, responding on behalf of Deputy Minister of Defence Arun Jayasekara, said the government would not hesitate to pursue legal action, including warrants, if necessary.

By Saman Indrajith