---TITLE: Glacier Respiration and Microbial Biomass

---AUTHORS:
-Jeffrey M. Welker
-JMW at Natural Resource Ecology Laboratory, Colorado State University, Fort 
Collins, CO 80523-1499.  Phone: 970-491-1796; Fax: 970-491-1965; Email: 
jwelker@nrel.colostate.edu

---DATA SET OVERVIEW:
-Soil microbial biomass and soil CO2 efflux were measured in terrestrial 
ecosystems immediately adjacent (<0.10m) to the Greenland Ice Sheet near Thule, 
Greenland (76°N, 68°W) in July 1997, and in ecosystems adjacent (<0.10 m) to 
the Twin Glacier on Ellesmere Island near Alexandra Fiord, Nunavut, Canada 
(78°N, 75°W) in July 1999 and periodically throughout the summer in 2000.  CO2 
efflux and microbial biomass were measured in sites that had just become 
ice-free during the current year, and in sites that had been free of ice for 
10, 20, 40, and ~5000 years at Alexandria Fiord and ice-free for ~40 and ~400 
years at Thule, Greenland.

---DATA COLLECTION and PROCESSING:
-Soil CO2 efflux was measured with an infrared gas analyzer (PP Systems, EGM-1) 
and a soil respiration chamber.  Soil microbial biomass carbon was determined 
in the laboratory using chloroform fumigation extraction methods.  About ~25 g 
of soil (0-10 cm) was collected for laboratory determination of soil microbial 
biomass adjacent to the locations where CO2 efflux was quantified.

---DATA FORMAT:
-Space delimited ASCII
- Data are space delimited ASCII and are mean values of the raw data.  Columns 
are SITE (Alexandra Fiord or Thule), YEAR (number of years that the site has 
been free of the overlying glacier), RESPIRATION (g/m2/d), StdErr-R (1 standard 
error of the mean respiration data), MicroBio (microbial biomass C - mg/g dry 
soil), and StdErr-M (1 standard error of the mean microbial biomass data).
-Data version 1.0 (11 March 2002), Preliminary

---REFERENCES:
-For more information regarding this data set, see the forthcoming article in 
EOS entitled "Previously ice entombed high arctic ecosystems have active 
microbes that are releasing CO2" by JM Welker, JT Fahnestock, GHR Henry, KW 
O'Dea, and RE Piper.