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Earth on the Brink: New Climate Projections Detail Future Risks for Many People Worldwide

August 12, 2023
in Science
Earth on the Brink: New Climate Projections Detail Future Risks for Many People Worldwide
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Burnt Earth Global Warming Climate Change

Extreme weather events are worsening globally, with a study by BAERI and NASA detailing how these conditions will intensify as the Earth’s temperature rises. Using the NEX-GDDP dataset, the research offers insights on climate impacts like heat stress and fire weather, urging local leaders to develop targeted climate plans using this data.

A recent study, built to enable local action, highlights the severe climate impacts resulting from a 2°C temperature rise.

This summer, the headlines have been dominated with reports of extreme weather: from raging wildfires in Canada to perilous floods in India, Japan, and the Eastern US; intense heat waves have scorched Spain, China, the US, and Mexico, culminating in the hottest day ever recorded on our planet.

A recent study conducted by scientists at the Bay Area Environmental Research Institute (BAERI) and NASA Ames Research Center provides a thorough examination of how these extreme events will worsen as our planet’s temperature creeps upwards, and where these events are more likely to clash and combine in ways that significantly impact people’s lives and livelihoods.

The study uses a publicly available NASA dataset, the NASA Earth eXchange – Global Daily Downscaled Projections (NEX-GDDP), that can “zoom in” on projected changes to a local scale, allowing any community in the world to start preparing today.

The study looked at a world where warming exceeds two degrees Celsius compared to pre-industrial times. It focused on the geographic patterns of projected changes to key climate variables, including changes to air temperature, precipitation, relative humidity, solar radiation, and wind speed. Two degrees of warming is widely considered to be a critical threshold above which Earth will witness the dangerous and cascading effects of human-generated climate change. According to the study, two degrees of warming is expected to occur sometime in the 2040s, though variation exists across projections from different climate models.

Projected Mean Air Temperature

Projected mean air temperature changes in the 2040s with respect to the baseline period (1950-1979) when the Earth will likely reach 2°C of global warming compared to pre-industrial levels. Credit: Taejin Park

Climate variables don’t act in isolation. “We wanted to study how these individual climate variables are projected to change and what their combined impacts could mean for people around the world. The changes in one variable can compound the effects of another. We need to look at them together to understand the real impact on human lives,” said Taejin Park, a researcher at BAERI and the first author on the paper.

The researchers paid special attention to two climate impact indicators: the first is heat stress or the combined effects of temperature and humidity on the human body. They found most regions of the world will experience higher heat stress in the 2040s compared to the 1950–1979 baseline, while equatorial countries will suffer more from a greater number of days considered extreme (e.g., a month of additional extreme heat stress days for countries in Eastern Africa).

The study also examined fire weather, another climate impact indicator. It showed a global increase in extreme fire weather, which is measured by combining the variables of temperature, rainfall, humidity, wind, and more into a fire weather index, or FWI. The researchers noted exceptional fire weather increases in the Amazon (+4.3 FWI), central and western North America (+3.3 FWI), and the Mediterranean (+3.7 FWI).

Projected Precipitation Changes

Projected precipitation changes in the 2040s with respect to the baseline period (1950-1979) when the Earth will likely reach 2°C of global warming compared to pre-industrial levels. Credit: Taejin Park

“The escalating impacts of all the climate extremes studied could cause significant damage to communities and economies from fires, floods, landslides, and crop failures that may result,” said Ramakrishna Nemani, senior scientist at BAERI and co-author of the study. Floods and droughts in particular are likely to become “more frequent, more intense, longer, or all three.”

Creating Unique Climate Insights Using Big Data

The NEX-GDDP dataset used for this research provides global, daily climate projections out to the year 2100. To create this dataset, the team took projections generated by the world’s leading climate models and used advanced statistical techniques to “downscale” them, a process that significantly improves spatial resolution.

Raw climate model projections give global, daily results for areas of about 120 by 120 miles (200 by 200 kilometers). The NEX-GDDP dataset zooms in to about 15 by 15 miles (25 by 25 kilometers), a resolution that could help leaders develop targeted climate adaptation and mitigation plans.

Downscaling processes often merge daily projections into monthly averages, but keeping the day-to-day data is important for capturing extreme events. If merged into a monthly average, Park explained, a few days projected to be dangerously hot and humid could get lost in the numbers, concealing the risk for human lives.

The conclusions of the study indicate the urgent need for decision-makers to understand the compounding climate impacts projected for their regions. The uniquely regional scale of the NEX-GDDP data can help local leaders develop climate adaptation and mitigation plans specific to their communities. “Data holds value only when it guides action, and the true value of NEX-GDDP is in its potential to drive positive change at a meaningful scale globally,” said Bridget Thrasher who led the development of NEX-GDDP data and is co-author of the study. The team is keen to make their data accessible to global communities and local decision-makers to enable positive real-world changes.

Reference: “What Does Global Land Climate Look Like at 2°C Warming?” by Taejin Park, Hirofumi Hashimoto, Weile Wang, Bridget Thrasher, Andrew R. Michaelis, Tsengdar Lee, Ian G. Brosnan and Ramakrishna R. Nemani, 20 December 2022, Earth’s Future.
DOI: 10.1029/2022EF003330

As of today, you can download the study’s fire weather data here—heat stress and other indicators will be available soon—and the authors are currently working to incorporate all of the study’s data into NASA’s interactive Earth Information Center.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/earth-on-the-brink-new-climate-projections-detail-future-risks-for-many-people-worldwide/

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