Extended Gap Between Snowmelt and Greenup Increases Dust Storm Occurrence

Area of Science:

• Earth and Environmental Sciences
• Climate Science
• Ecology

Background:

• Climate change significantly impacts spring phenology and snowmelt timing globally.
• The period between snowmelt end date (SED) and start of growing season (SOS), known as the SED-SOS gap, has been understudied.
• Understanding the SED-SOS gap is crucial for assessing climate change consequences.

Purpose of the Study:

• To investigate temporal trends in the SED-SOS gap across the Northern Hemisphere using satellite and ground-based data.
• To analyze the factors contributing to SED-SOS gap changes in different geographical regions.
• To assess the ecological and societal impacts of an extended SED-SOS gap.

Main Methods:

• Utilized satellite-derived and ground-based data for SED and SOS from 2001 to 2019.
• Analyzed temporal trends in the SED-SOS gap across the Northern Hemisphere.
• Conducted a case study in Inner Mongolia to examine the link between SED-SOS gap and dust storm occurrence.

Main Results:

• The SED-SOS gap has been extending at an average rate of -0.10 days yr⁻¹, with approximately 50% of regions showing this trend.
• High-latitude and high-altitude regions exhibit narrowing SED-SOS gaps, while mid-latitude regions show extending gaps.
• An extended SED-SOS gap in Inner Mongolia was linked to increased dust storm frequency due to enhanced soil erosion.

Conclusions:

• The SED-SOS gap is a critical, underappreciated aspect of climate change impacts.
• Regional variations in SED-SOS gap trends necessitate tailored monitoring and adaptation strategies.
• Monitoring the SED-SOS gap is vital for predicting and mitigating risks to ecosystems and human well-being under future climate change.