A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core
The 110,000‐year record of ammonium concentrations from the Greenland Ice Sheet Project 2 (GISP2) ice core provides the basis for an analysis of terrestrial biological production and atmospheric circulation patterns involved in the transport of biologically produced ammonium to the Greenland atmosph...
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ftuninhampshire:oai:scholars.unh.edu:faculty_pubs-1348 2023-05-15T16:25:09+02:00 A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core Meeker, L. David Mayewski, Paul A. Twickler, Mark S. Whitlow, Sallie I. Meese, Debra A. 1997-11-30T08:00:00Z application/pdf https://scholars.unh.edu/faculty_pubs/349 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1348&context=faculty_pubs unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/faculty_pubs/349 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1348&context=faculty_pubs ©1997. American Geophysical Union. All Rights Reserved. Faculty Publications text 1997 ftuninhampshire 2023-01-30T21:49:54Z The 110,000‐year record of ammonium concentrations from the Greenland Ice Sheet Project 2 (GISP2) ice core provides the basis for an analysis of terrestrial biological production and atmospheric circulation patterns involved in the transport of biologically produced ammonium to the Greenland atmosphere. The directly measured concentration series was selected for analysis, rather than that of estimated ammonium flux, after a detailed analysis of the relationship among ice core glaciochemical concentrations and a high‐resolution simultaneous record of snow accumulation from the GISP2 core. Analysis of the ammonium concentration series shows that maxima in background levels of ammonium in the Greenland atmosphere are strongly related to and synchronous with summer forcing associated with the precessional cycle of insolation. Minima in background levels, on the other hand, are delayed relative to minima in summer insolation at those times when ice volume is significant. The duration of these delays are similar in magnitude (≈6000 years) to other paleoclimatic responses to changes in ice volume. Decadal and centennial scale variation about background levels of ammonium concentration exhibit two modes of behavior when compared to a record of polar atmospheric circulation intensity. During warmer periods ammonium transport to Greenland is similar to present patterns. Under coldest conditions the low levels of ammonium transported to Greenland are the result of extreme southerly excursions of the predominantly zonal polar circulation. The rapid transitions (≈200 years) between these two climatic conditions appear to be associated with a critical volume or extent of the continental ice sheets. Text Greenland Greenland Ice Sheet Project ice core Ice Sheet University of New Hampshire: Scholars Repository Greenland |
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University of New Hampshire: Scholars Repository |
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ftuninhampshire |
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description |
The 110,000‐year record of ammonium concentrations from the Greenland Ice Sheet Project 2 (GISP2) ice core provides the basis for an analysis of terrestrial biological production and atmospheric circulation patterns involved in the transport of biologically produced ammonium to the Greenland atmosphere. The directly measured concentration series was selected for analysis, rather than that of estimated ammonium flux, after a detailed analysis of the relationship among ice core glaciochemical concentrations and a high‐resolution simultaneous record of snow accumulation from the GISP2 core. Analysis of the ammonium concentration series shows that maxima in background levels of ammonium in the Greenland atmosphere are strongly related to and synchronous with summer forcing associated with the precessional cycle of insolation. Minima in background levels, on the other hand, are delayed relative to minima in summer insolation at those times when ice volume is significant. The duration of these delays are similar in magnitude (≈6000 years) to other paleoclimatic responses to changes in ice volume. Decadal and centennial scale variation about background levels of ammonium concentration exhibit two modes of behavior when compared to a record of polar atmospheric circulation intensity. During warmer periods ammonium transport to Greenland is similar to present patterns. Under coldest conditions the low levels of ammonium transported to Greenland are the result of extreme southerly excursions of the predominantly zonal polar circulation. The rapid transitions (≈200 years) between these two climatic conditions appear to be associated with a critical volume or extent of the continental ice sheets. |
format |
Text |
author |
Meeker, L. David Mayewski, Paul A. Twickler, Mark S. Whitlow, Sallie I. Meese, Debra A. |
spellingShingle |
Meeker, L. David Mayewski, Paul A. Twickler, Mark S. Whitlow, Sallie I. Meese, Debra A. A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core |
author_facet |
Meeker, L. David Mayewski, Paul A. Twickler, Mark S. Whitlow, Sallie I. Meese, Debra A. |
author_sort |
Meeker, L. David |
title |
A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core |
title_short |
A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core |
title_full |
A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core |
title_fullStr |
A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core |
title_full_unstemmed |
A 110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the Greenland Ice Sheet Project Ice Core |
title_sort |
110,000‐year history of change in continental biogenic emissions and related atmospheric circulation inferred from the greenland ice sheet project ice core |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
1997 |
url |
https://scholars.unh.edu/faculty_pubs/349 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1348&context=faculty_pubs |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland Ice Sheet Project ice core Ice Sheet |
genre_facet |
Greenland Greenland Ice Sheet Project ice core Ice Sheet |
op_source |
Faculty Publications |
op_relation |
https://scholars.unh.edu/faculty_pubs/349 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1348&context=faculty_pubs |
op_rights |
©1997. American Geophysical Union. All Rights Reserved. |
_version_ |
1766013839358296064 |