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Antarctic ice sheets capable of much faster melting than we thought

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Antarctic ice sheets capable of much faster melting than we thought

Studying patterns of wave-like ridges on the Antarctic seafloor, scientists from the Scott Polar Research Institute at the University of Cambridge found that some 12,000 years ago, ice retreated at speeds in excess of 10 kilometers (6.2 miles) a year — far more rapid than today’s retreat rates, which are calculated using satellite data.

Researchers warn that, should climate change carry on weakening ice shelves in coming decades, we could soon see similar levels of ice retreat — more than were thought possible — with huge implications for global sea levels.

Though sea ice conditions stopped the team from retrieving images of the legendary wreck, they were able to map the seafloor near to the Larsen Ice Shelf, east of the Antarctic Peninsula.

The Larsen Ice Shelf originally covered an area of 33,000 square miles, but has shrunk dramatically as air temperatures warmed in the second half of the 20th century.

Sections of the shelf have disintegrated and broken away, and in 2017 around 12% of the remaining lower middle section of the shelf broke away as a single massive iceberg, measuring some 2,240 square miles.

Using autonomous underwater vehicles (AUV) operating about 60 meters (197 feet) above the seabed, researchers studied ridges on the seafloor, which had been created by ice squeezing sediment on the sea bed as it moved and began to float.

“We saw these absolutely beautiful delicate patterns of backstepping sets of very small ridges spaced about 20 to 25 meters apart and about half a meter high,” Julian Dowdeswell, director of the Scott Polar Research Institute, told CNN.

By examining the footprint of the ice sheet and sets of ridges on the seafloor, the team was able to find new evidence of past ice retreats, published in Science journal Thursday, which were faster than those observed in even the most sensitive part of Antarctica today.

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“We now know that the ice is capable of retreating at speeds far higher than what we see today. Should climate change continue to weaken the ice shelves in the coming decades, we could see similar rates of retreat, with profound implications for global sea level rise,” Dowdeswell added in a statement.

A recent study by NASA showed that Antarctica and Greenland’s ice sheets lost 118 gigatons and 200 gigatons of ice on average per year, which caused the sea level to rise by about half an inch between 2003 and 2019.
This giant glacier in Antarctica is melting, and it could raise sea levels by 5 feet, scientists say

Warmer summer temperatures are chiefly to blame for this ice loss, according to NASA. The warm temperatures have melted ice from the surface of the glaciers and ice sheets.

Experts say this new study shows that, given the speed at which the ice retreated in the past, the future rate of change and ice retreat could be significantly greater than previously thought.

“What the geological record is showing is rates of change can be significantly faster than the fastest rates that we’ve observed in the satellite record, which of course means that ice can in principle be decanted back into the ocean faster than we thought — with implications for sea level rise,” Dowdeswell told CNN.

He explained that knowing how fast the ice shelves are capable of melting is important when looking at how models project the polar ice cap melting in future decades — and how much sea levels might rise.

Before, if models predicted high rates of melt, experts may be inclined to believe this was not possible, Dowdeswell said. “But now we can say it has happened, and therefore it is possible.”

Experts have warned that over the next three decades, hundreds of millions of people worldwide are at risk of losing their homes as entire cities sink under rising seas.
Scientists have warned that the planet’s warming is accelerating melting in glaciers and ice sheets from Greenland to Antarctica, and that sea levels will likely rise more than previously projected by the end of this century.

Experts have said that sea level rise is likely to exceed three feet by 2100 if carbon emissions continue to increase, and many of the 680 million people around the world living in low-lying coastal areas will experience annual flooding events by 2050.

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CNN’s Jessie Yeung, Drew Kann and Mallika Kallingal contributed to this report.

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Laporan Pertandingan Terbaru – Inggris vs Pakistan 7th T20I 2022

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Melemparkan pakistan Dia memilih untuk melawan Inggris

Babar Azam memenangkan undian dan memilih untuk mengejar di T20I ketujuh dan terakhir dari seri melawan Inggris. Dengan tim yang saat ini terikat 3-3, pertandingan ketiga di Lahore akan menjadi penentu.

Pakistan membuat tiga perubahan pada XI yang dikalahkan secara komprehensif pada Jumat malam, dengan Mohammad Rizwan dan Haris Rauf – pencetak gol terbanyak dan pencetak gawang di kedua sisi – keduanya dipanggil kembali. Mohammad Hasnain juga masuk, Mohammad Haris, Amir Jamal dan Shahnawaz Dahani duduk di luar.

Inggris membawa kembali Chris Woakes untuk menggantikan Richard Gleeson untuk penampilan keduanya dalam seri, tetapi Mark Wood secara resmi “keluar dari bahaya” menjelang Piala Dunia T20 di Australia. Moeen Ali terus menjadi kapten tim, sementara Jos Buttler masih menunggu waktu yang tepat untuk kembali dari cedera betis.

Pakistan: 1 Babar Azam (Kapten), 2 Mohammad Rizwan (VK), 3 Shaan Masood, 4 Haider Ali, 5 Iftikhar Ahmed, 6 Asif Ali, 7 Mohammad Nawaz, 8 Shatab Khan, 9 Mohammad Hasnain, 10 Mohammad Wasim, 11 Haris Roop

Inggris: 1 Phil Salt (minggu), 2 Alex Hales, 3 David Malone, 4 Ben Duckett, 5 Harry Brook, 6 Moeen Ali (kapt), 7 Sam Curran, 8 Chris Woakes, 9 David Willey, 10 Adil Rashid, 11 Reece Tapley

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Cated!! 3-16 Oktober Operasi Zebra Samrat, Pericut Target Belangaran

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Rathahan-Terhitung 3-16 Oktober 2022, Kepolician Resort Minahasa Tenkara Akan Mengeler Operasi Zebra Samrat. Operasi ini sedianya menerketkan operasi baghi ​​penkendra belangar lalulintas.

Kabolres Minahasa Tengara, AKPP Feri Sidorus Mengungabkan Belangaran Yang Pagal Didintak Melipudi Belangaran Lalulintas Kelungappan Kenderan Hinga Benkemudi Yang Didak Menkindahkan Keslamadan Lalulintas.

“Dermasuk nandiniya kendran tengan knalbot berbisik, kendran melawan arus, melebihi patas kesepathan sambai benghemudi yang didapati menkhonsumsi minuman karas,” ujar Feri.

(Marfel Bandaleke)

Perigood Target Operasi Zebra Samrat 2022 :

– Bengamudi Kendaran Permotor Yang Mengunagan Ponsel.
– Bengamudi Kendran Permotor Yang Masih Tipawa Umur.
– Pengendara R2 berboncengan lebih dari 1 orang.
– Bengamudi Yang Didak Mengunagan Helm Tan Safety Belt.
– Mengemudigan kendran permotor dalam pengaru alkohol.
– Bengamudi Yang Melavan Arus Lalin.
– Bengemudi Ranmore Yang Melebihi Badas Geshepatan.
– kelangapan kenderan tengan mengunagan gnal pat prong / pising don kenderan tidak mengunagan flat nomore / tnkb.

Jumlah: Polres Minahasa Tenkara.



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Kemendikbud tekankan pentingnya vaksinasi booster bagi lansia

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Jakarta (Antara) – Kementerian Koordinator Bidang Pembangunan Manusia dan Kebudayaan menyoroti pentingnya dosis ketiga atau dosis booster pertama bagi lansia untuk memberikan perlindungan optimal terhadap COVID-19.

“Vaksin booster sangat diperlukan bagi lansia dan kelompok rentan lainnya, termasuk mereka yang memiliki penyakit penyerta,” kata Agus Suprapto, Deputi Bidang Peningkatan Kualitas dan Pengembangan Kependudukan Kementerian Kesehatan, saat dihubungi di Jakarta, Kamis.

Menurut Suprado, vaksin booster dinilai perlu untuk menekan angka rawat inap dan mencegah korban mengalami gejala yang parah.

“Meskipun jumlah kasus COVID-19 sudah mulai terkendali, namun tetap perlu menerapkan protokol kesehatan dan vaksinasi, termasuk untuk lansia,” tegasnya.

Dia menegaskan, pemerintah akan terus mengimbau masyarakat untuk mendukung upaya pemerintah meningkatkan cakupan vaksin booster.

“Masyarakat dapat berperan aktif dengan berinisiatif mengunjungi puskesmas terdekat atau stand vaksinasi bagi yang belum mendapatkan dosis booster,” ujarnya.

Selain itu, sosialisasi tentang manfaat dosis vaksinasi booster terus digencarkan untuk meningkatkan kesadaran dan pemahaman masyarakat akan pentingnya vaksinasi.

Sementara itu, Ketua Umum Ikatan Dokter dan Spesialis Kependudukan Indonesia (IPADI) Sutipio Alimoso mengimbau agar sosialisasi lebih intensif terkait penerapan vaksin COVID-19 dan protokol kesehatan kepada lansia.

“Tujuannya untuk meningkatkan pemahaman dan kesadaran lansia tentang protokol kesehatan dan pentingnya vaksin COVID-19 untuk mencegah penyebaran COVID-19,” ujarnya.

Ia menegaskan, jika lansia sehat, aktif dan produktif, mereka bisa menjadi bonus demografi kedua yang berkontribusi positif bagi kesejahteraan masyarakat.

Sebagai bagian dari upaya peningkatan imunitas masyarakat, pemerintah Indonesia mencanangkan program vaksinasi nasional pada 13 Januari 2021 dengan target 234.666.020 WNI.

Menurut data yang diberikan Gugus Tugas COVID-19, per 29 September 2022, 204.556.520 orang Indonesia menerima dosis vaksin pertama, 171.161.526 menerima dosis kedua, 63.466.363 menerima dosis ketiga, dosis pertama atau 6080. telah menerima dosis keempat atau booster kedua. (IN)

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