collapse

133 readers
35 users here now

Placeholder for time being, moving from lemm.ee

founded 1 month ago
MODERATORS
1
2
3
4
 
 

One of the few stable glaciers in a warming world, Perito Moreno, in Santa Cruz province, Argentina, is now undergoing a possibly irreversible retreat, scientists say.

Over the past seven years, it has lost 1.92 sq km (0.74 sq miles) of ice cover and its thickness is decreasing by up to 8 metres (26 ft) a year.

For decades, Perito Moreno defied the global trend of glacial retreat, maintaining an exceptional balance between snow accumulation and melting. Its dramatic calving events, when massive blocks of ice crashed into Lago Argentino, became a symbol of natural wonder, drawing millions of visitors to southern Patagonia.

Is this disaster tourism emblamatic of human stupidity ? I see people saying they want to go to the Great Barrier Reef before it's conplelty fucked. Seems every year now there's some story in Greece and 1000s of tourists being evacuated becase of some wildfire or other. I see instead of visiting Portugal, Spain or Greece people are considering tourism in Norway etc,

Between pollution and GHG's destroying rhe biosphere, we make a place horrible, then move on and do the same thing, what is wrong with our species anon's ?

5
6
7
 
 

Abstract

Detecting tree cover is crucial for sustainable land management and climate mitigation. Here we develop an automatic detection algorithm using high-resolution satellite data (<5 m) to map pan-tropical tree cover (2015–2022), enabling identification and change analysis for previously undetected tree cover (PUTC). Our findings reveal that neglecting PUTC represents 17.31 ± 1.78% of the total pan-tropical tree cover. Tree cover net decreased by 61.05 ± 2.36 Mha in both forested areas (63.93%) and non-forested areas (36.07%) between 2015 and 2022. Intense changes in tree cover are primarily observed in regions with PUTC, where the World Cover dataset with a resolution of 10 m often fails to accurately detect tree cover. We also conduct a sensitivity analysis to quantify the contributions f climate factors and anthropogenic impacts (including human activities and land use cover change) to tree cover dynamics. Our findings indicate that 43.98% of tree cover gain is linked to increased precipitation, while 56.03% of tree cover loss is associated with anthropogenic impacts. These findings highlight the need to include undetected tree cover in strategies combating degradation, climate change, and promoting sustainability. Fine-scale mapping can improve biogeochemical cycles modeling and vegetation-climate interactions, improving global change understanding.

8
4
The Crisis Report - 112 (richardcrim.substack.com)
submitted 19 hours ago by eleitl@lemmy.zip to c/collapse@lemmy.zip
9
10
11
12
13
14
 
 
15
16
17
18
19
20
21
22
4
#306: Henry’s paradox (surplusenergyeconomics.wordpress.com)
submitted 4 days ago by eleitl@lemmy.zip to c/collapse@lemmy.zip
23
 
 

Abstract

Antarctic ice shelves play a pivotal role in global sea-level regulation, yet their sensitivity to temperature variations, freeze-thaw cycles, and biotic factors such as snow algae remains under-explored. This study addresses the critical question: how do snow algae influence the melting dynamics of Antarctic ice shelves under changing climatic conditions? To answer this question, the study applies time-lag adjusted Pearson correlation and Granger causality tests to high-resolution Sentinel-1 and Sentinel-2 time-series data in Google Earth Engine. The findings demonstrate that algae biomass influences subsequent melting, underscoring snow algae’s pivotal role in accelerating the melting of Antarctic ice shelves. This research emphasizes the need to integrate biotic factors in models of polar ice dynamics and climate change projections. The study also provides a workflow for snow algae and snowmelt analysis at high resolution over large areas, contributing to a deeper understanding of snowmelt and global sea-level rise.

Keywords: Snowmelt, Snow algae, Antarctic ice shelf, Big earth data, SAR, MSI

Subject terms: Cryospheric science, Environmental impact, Scientific data

24
 
 

Things have really changed … The entire system of research and higher education in the United States is really under attack.”

It was a glimpse of the “historic” moment the world was facing, said Éric Berton, the university’s president. “More than 80 years ago, as France was under occupation and repression, America welcomed exiled researchers, offering them a helping hand and allowing them to keep science alive,” he said. “And now, in a sad reversal of history, some American scientists have arrived in France in search of a space for freedom, thought and research.”

People are moving, for sure,” said Lee. “A lot of top people have already moved to China. And China is laying out the red carpet. If people are getting an offer from Canada, people are moving to Canada.”

25
view more: next ›