BACKGROUND LEVELS OF HCOO^-, CH_3SO_3^-, NO_3^-, SO_4^<2-> AND NH_4^+ IN ICE CORES FROM INLAND GREENLAND

• Main Authors: オサダ カズオ /, Kazuo OSADA, Chester C. LANGWAY
• Format: Report
• Language: English
• Published: ABSTRACT 1994
• Subjects: Greenland; Ice Sheet; Polar meteorology and glaciology; Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3855; http://id.nii.ac.jp/1291/00003855/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3855&item_no=1&attribute_id=18&file_no=1

Concentration levels of the organic acids HCOO^- and CH_3SO_3^-, inorganic acids NO_3^- and excess SO_4^<2-> and ammonium were measured in pre-1900 AD ice layers from seven geographically dispersed inland sites in Greenland. Average multiple-year background concentration levels are calculated for each ion at each site from laboratory measurements of continuous core samples representing from 4 to 10 years of snow accumulation (32 to 80 individual measurements) from various time intervals. The HCOO^- concentration level increases from 6 ng/g in the northern most cold site to 36 ng/g in the southern most warm site; CH_3SO_3^- increases from 0.9 ng/g to 2.8 ng/g; NO_3^- decreases from 83 ng/g to 37 ng/g; excess SO_4^<2-> decreases from 43 ng/g to 19 ng/g, all with variability. The distribution of the NH_4^+ ion shows a nearly constant level at about 6 ng/g for all sites except Dye-2 where it reaches 10 ng/g. The deposition patterns for HCOO^- and NH_4^+ on the ice sheet suggest that major contributions arrive from sources originating from the southwest of Greenland.