Depletion of atmospheric nitrate and chloride as a consequence of the Toba volcanic eruption

被引：12

作者：

Yang, Q ^{[1
]}

Mayewski, PA ^{[1
]}

Zielinski, GA ^{[1
]}

Twickler, M ^{[1
]}

Taylor, KC ^{[1
]}

机构：

[1] UNIV NEVADA, DESERT RES INST, RENO, NV 89506 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 1996年 / 23卷 / 18期

关键词：

D O I：

10.1029/96GL02201

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Continuous measurements of SO42- and electrical 4 conductivity (ECM) along the GISP2 ice core record the Toba mega-eruption at a depth 2590.95 to 2091.25 m (71,000+/-5000 years ago). Major chemical species were analyzed at a resolution of 1 cm per sample for this section. An similar to 6-year long period with extremely high volcanic SO42- coincident with a 94% depletion of nitrate acid 63% depletion of chloride is observed at the depth of the Toba horizon. Such a reduction of chloride in a volcanic layer preserved in an ice core has not been observed in any previous studies. The nearly complete depletion of nitrate (to 5 ppb) encountered at the Toba level is the lowest value in the entire similar to 250,000 years of the GISP2 ice core record. We propose possible mechanisms to explain the depletion of nitrate and chloride resulting from this mega-eruption.

引用

页码：2513 / 2516

页数：4

共 33 条

[1] DENITRIFICATION MECHANISM OF THE POLAR WINTER STRATOSPHERE BY MAJOR VOLCANIC-ERUPTIONS [J].