Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle
[1] A first analysis of new daily discharge data for 111 northern rivers from 1936–1999 and 1958–1989 finds an overall pattern of increasing minimum daily flows (or ‘‘low flows’’) throughout Russia. These increases are generally more abundant than are increases in mean flow and appear to drive much...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.484.999 2023-05-15T15:07:35+02:00 Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle Laurence C. Smith Tamlin M. Pavelsky Glen M. Macdonald Er I. Shiklomanov Richard B. Lammers The Pennsylvania State University CiteSeerX Archives 2007 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.999 http://www.sscnet.ucla.edu/geog/downloads/297/292.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.999 http://www.sscnet.ucla.edu/geog/downloads/297/292.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.sscnet.ucla.edu/geog/downloads/297/292.pdf text 2007 ftciteseerx 2016-01-08T08:08:08Z [1] A first analysis of new daily discharge data for 111 northern rivers from 1936–1999 and 1958–1989 finds an overall pattern of increasing minimum daily flows (or ‘‘low flows’’) throughout Russia. These increases are generally more abundant than are increases in mean flow and appear to drive much of the overall rise in mean flow observed here and in previous studies. Minimum flow decreases have also occurred but are less abundant. The minimum flow increases are found in summer as well as winter and in nonpermafrost as well as permafrost terrain. No robust spatial contrasts are found between the European Russia, Ob’, Yenisey, and Lena/eastern Siberia sectors. A subset of 12 unusually long discharge records from 1935–2002, concentrated in south central Russia, suggests that recent minimum flow increases since 1985 are largely unprecedented in the instrumental record, at least for this small group of stations. If minimum flows are presumed sensitive to groundwater and unsaturated zone inputs to river discharge, then the data suggest a broad-scale mobilization of such water sources in the late 20th century. We speculate that reduced intensity of seasonal ground freezing, together with precipitation increases, might drive much of the well documented but poorly understood increases in river discharge to the Arctic Ocean. Text Arctic Arctic Ocean permafrost Siberia Unknown Arctic Arctic Ocean Yenisey ENVELOPE(82.680,82.680,71.828,71.828) |
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English |
description |
[1] A first analysis of new daily discharge data for 111 northern rivers from 1936–1999 and 1958–1989 finds an overall pattern of increasing minimum daily flows (or ‘‘low flows’’) throughout Russia. These increases are generally more abundant than are increases in mean flow and appear to drive much of the overall rise in mean flow observed here and in previous studies. Minimum flow decreases have also occurred but are less abundant. The minimum flow increases are found in summer as well as winter and in nonpermafrost as well as permafrost terrain. No robust spatial contrasts are found between the European Russia, Ob’, Yenisey, and Lena/eastern Siberia sectors. A subset of 12 unusually long discharge records from 1935–2002, concentrated in south central Russia, suggests that recent minimum flow increases since 1985 are largely unprecedented in the instrumental record, at least for this small group of stations. If minimum flows are presumed sensitive to groundwater and unsaturated zone inputs to river discharge, then the data suggest a broad-scale mobilization of such water sources in the late 20th century. We speculate that reduced intensity of seasonal ground freezing, together with precipitation increases, might drive much of the well documented but poorly understood increases in river discharge to the Arctic Ocean. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Laurence C. Smith Tamlin M. Pavelsky Glen M. Macdonald Er I. Shiklomanov Richard B. Lammers |
spellingShingle |
Laurence C. Smith Tamlin M. Pavelsky Glen M. Macdonald Er I. Shiklomanov Richard B. Lammers Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle |
author_facet |
Laurence C. Smith Tamlin M. Pavelsky Glen M. Macdonald Er I. Shiklomanov Richard B. Lammers |
author_sort |
Laurence C. Smith |
title |
Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle |
title_short |
Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle |
title_full |
Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle |
title_fullStr |
Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle |
title_full_unstemmed |
Rising Minimum Daily Flows in Northern Eurasian Rivers: A Growing Influence of Groundwater in the High-Latitude Hydrologic Cycle |
title_sort |
rising minimum daily flows in northern eurasian rivers: a growing influence of groundwater in the high-latitude hydrologic cycle |
publishDate |
2007 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.999 http://www.sscnet.ucla.edu/geog/downloads/297/292.pdf |
long_lat |
ENVELOPE(82.680,82.680,71.828,71.828) |
geographic |
Arctic Arctic Ocean Yenisey |
geographic_facet |
Arctic Arctic Ocean Yenisey |
genre |
Arctic Arctic Ocean permafrost Siberia |
genre_facet |
Arctic Arctic Ocean permafrost Siberia |
op_source |
http://www.sscnet.ucla.edu/geog/downloads/297/292.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.999 http://www.sscnet.ucla.edu/geog/downloads/297/292.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766339056478715904 |