Arctic sea ice retreat fuels boreal forest advance
成果类型：
Article
署名作者：
Dial, Roman J.; Maher, Colin T.; Hewitt, Rebecca E.; Wockenfuss, Amy M.; Wong, Russell E.; Crawford, Daniel J.; Zietlow, Madeline G.; Sullivan, Patrick F.
署名单位：
Alaska Pacific University; University of Alaska System; University of Alaska Anchorage; Northern Arizona University; United States Department of Agriculture (USDA); United States Forest Service; Amherst College; University of Alaska System; University of Alaska Anchorage
刊物名称：
SCIENCE
ISSN/ISSBN：
0036-8996
DOI：
10.1126/science.adh2339
发表日期：
2024-02-23
页码：
877-884
关键词：
摘要：
Climate-induced northward advance of boreal forest is expected to lessen albedo, alter carbon stocks, and replace tundra, but where and when this advance will occur remains largely unknown. Using data from 19 sites across 22 degrees of longitude along the tree line of northern Alaska, we show a stronger temporal correlation of tree ring growth with open water uncovered by retreating Arctic sea ice than with air temperature. Spatially, our results suggest that tree growth, recruitment, and range expansion are causally linked to open water through associated warmer temperatures, deeper snowpacks, and improved nutrient availability. We apply a meta-analysis to 82 circumarctic sites, finding that proportionally more tree lines have advanced where proximal to ongoing sea ice loss. Taken together, these findings underpin how and where changing sea ice conditions facilitate high-latitude forest advance.