Project Title

Antarctica as a model system for responses of terrestrial carbon balance to warming

Summary

Event Number:
B-086-P
NSF / OPP Award 1947562

Program Director:
Dr. William Ambrose

ASC POC/Implementer:
David Rivera / Jamee Johnson

Principal Investigator(s)

Dr. Natasja van Gestel
natasja.van-gestel@ttu.edu
Texas Tech University

Project Web Site:
https://www.nvangestel.com/antarctica

Location

Supporting Stations: Palmer Station
Research Locations: Palmer Station Backyard and Litchfield Island

Description

This study will investigate carbon transformation processes and the microbial communities that are responsible for such transformations in soils of the Antarctic Peninsula. Researchers will examine net ecosystem carbon balance among soils with different exposure ages that have been uncovered by retreating glaciers. Researchers will identify individual members of the soil microbial community that are active versus those that are not active. This will create a better understanding of the fundamental processes of community succession in the Antarctic environment and whether continued warming could lead to community shifts in the active portion of the communities.

The overarching objective of this project is to link warming-induced shifts in ecosystem carbon balance in Antarctic terrestrial ecosystems to plant and microbial responses to warming. Specific goals are to determine 1) How carbon balance shifts in response to warming along a plant productivity gradient; 2) Whether a shift in this balance is related to stronger responses in carbon update or losses; and 3) The mechanisms responsible for these responses.

Field Season Overview

Two people will deploy to Palmer Station from early December to mid-March. A third person will join in mid-February and remain until mid-March. The team will set up 40 plots in the glacier forefield behind Palmer Station and on Litchfield Island. They will install 20 open-top chambers (OTC) and 20 control plots along a productivity gradient (five at each productivity level). At each plot the team will insert stainless steel collars and environmental probes. OTCs will be deployed as soon as possible after snowmelt (early December) and will be removed at the end of the growing season (mid-March). The environmental probes and steel collars will remain in the field for the duration of the project.

Deploying Team Members