Changes in continental freshwater discharge from 1948 to 2004
A new dataset of historical monthly streamflow at the farthest downstream stations for the world’s 925 largest ocean-reaching rivers has been created for community use. Available new gauge records are added to a network of gauges that covers 80 × 10⁶ km² or 80% of global ocean-draining land areas an...
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American Meteorological Society
2009
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-955 https://doi.org/10.1175/2008JCLI2592.1 |
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ftncar:oai:drupal-site.org:articles_15260 2024-04-14T08:08:27+00:00 Changes in continental freshwater discharge from 1948 to 2004 Dai, Aiguo (author) Qian, Taotao (author) Trenberth, Kevin (author) Milliman, John (author) 2009-05-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-955 https://doi.org/10.1175/2008JCLI2592.1 en eng American Meteorological Society Journal of Climate Streamflow drought indicators across conterminous United States--10.5065/D6QR4V9X Augmented Monthly Flow Rates of World Rivers (except former Soviet Union)--10.5065/D61G0JGZ http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-955 doi:10.1175/2008JCLI2592.1 ark:/85065/d7t43v3s Copyright 2009 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. Text article 2009 ftncar https://doi.org/10.1175/2008JCLI2592.1 2024-03-21T18:00:26Z A new dataset of historical monthly streamflow at the farthest downstream stations for the world’s 925 largest ocean-reaching rivers has been created for community use. Available new gauge records are added to a network of gauges that covers 80 × 10⁶ km² or 80% of global ocean-draining land areas and accounts for about 73% of global total runoff. For most of the large rivers, the record for 1948-2004 is fairly complete. Data gaps in the records are filled through linear regression using streamflow simulated by a land surface model [Community Land Model, version 3 (CLM3)] forced with observed precipitation and other atmospheric forcings that are significantly (and often strongly) correlated with the observed streamflow for most rivers. Compared with previous studies, the new dataset has improved homogeneity and enables more reliable assessments of decadal and long-term changes in continental freshwater discharge into the oceans. The model-simulated runoff ratio over drainage areas with and without gauge records is used to estimate the contribution from the areas not monitored by the gauges in deriving the total discharge into the global oceans. Results reveal large variations in yearly streamflow for most of the world’s large rivers and for continental discharge, but only about one-third of the top 200 rivers (including the Congo, Mississippi, Yenisey, Paraná, Ganges, Columbia, Uruguay, and Niger) show statistically significant trends during 1948-2004, with the rivers having downward trends (45) outnumbering those with upward trends (19). The interannual variations are correlated with the El Niño-Southern Oscillation (ENSO) events for discharge into the Atlantic, Pacific, Indian, and global ocean as a whole. For ocean basins other than the Arctic, and for the global ocean as a whole, the discharge data show small or downward trends, which are statistically significant for the Pacific (-9.4 km³ yr⁻¹). Precipitation is a major driver for the discharge trends and large interannual-to-decadal variations. Comparisons ... Article in Journal/Newspaper Arctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic Indian Pacific Uruguay Yenisey ENVELOPE(82.680,82.680,71.828,71.828) Journal of Climate 22 10 2773 2792 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
A new dataset of historical monthly streamflow at the farthest downstream stations for the world’s 925 largest ocean-reaching rivers has been created for community use. Available new gauge records are added to a network of gauges that covers 80 × 10⁶ km² or 80% of global ocean-draining land areas and accounts for about 73% of global total runoff. For most of the large rivers, the record for 1948-2004 is fairly complete. Data gaps in the records are filled through linear regression using streamflow simulated by a land surface model [Community Land Model, version 3 (CLM3)] forced with observed precipitation and other atmospheric forcings that are significantly (and often strongly) correlated with the observed streamflow for most rivers. Compared with previous studies, the new dataset has improved homogeneity and enables more reliable assessments of decadal and long-term changes in continental freshwater discharge into the oceans. The model-simulated runoff ratio over drainage areas with and without gauge records is used to estimate the contribution from the areas not monitored by the gauges in deriving the total discharge into the global oceans. Results reveal large variations in yearly streamflow for most of the world’s large rivers and for continental discharge, but only about one-third of the top 200 rivers (including the Congo, Mississippi, Yenisey, Paraná, Ganges, Columbia, Uruguay, and Niger) show statistically significant trends during 1948-2004, with the rivers having downward trends (45) outnumbering those with upward trends (19). The interannual variations are correlated with the El Niño-Southern Oscillation (ENSO) events for discharge into the Atlantic, Pacific, Indian, and global ocean as a whole. For ocean basins other than the Arctic, and for the global ocean as a whole, the discharge data show small or downward trends, which are statistically significant for the Pacific (-9.4 km³ yr⁻¹). Precipitation is a major driver for the discharge trends and large interannual-to-decadal variations. Comparisons ... |
author2 |
Dai, Aiguo (author) Qian, Taotao (author) Trenberth, Kevin (author) Milliman, John (author) |
format |
Article in Journal/Newspaper |
title |
Changes in continental freshwater discharge from 1948 to 2004 |
spellingShingle |
Changes in continental freshwater discharge from 1948 to 2004 |
title_short |
Changes in continental freshwater discharge from 1948 to 2004 |
title_full |
Changes in continental freshwater discharge from 1948 to 2004 |
title_fullStr |
Changes in continental freshwater discharge from 1948 to 2004 |
title_full_unstemmed |
Changes in continental freshwater discharge from 1948 to 2004 |
title_sort |
changes in continental freshwater discharge from 1948 to 2004 |
publisher |
American Meteorological Society |
publishDate |
2009 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-955 https://doi.org/10.1175/2008JCLI2592.1 |
long_lat |
ENVELOPE(82.680,82.680,71.828,71.828) |
geographic |
Arctic Indian Pacific Uruguay Yenisey |
geographic_facet |
Arctic Indian Pacific Uruguay Yenisey |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Journal of Climate Streamflow drought indicators across conterminous United States--10.5065/D6QR4V9X Augmented Monthly Flow Rates of World Rivers (except former Soviet Union)--10.5065/D61G0JGZ http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-955 doi:10.1175/2008JCLI2592.1 ark:/85065/d7t43v3s |
op_rights |
Copyright 2009 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/2008JCLI2592.1 |
container_title |
Journal of Climate |
container_volume |
22 |
container_issue |
10 |
container_start_page |
2773 |
op_container_end_page |
2792 |
_version_ |
1796305888884031488 |