Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins
An atmospheric general circulation model simulation for 1948-1997 of the water budgets for the MacKenzie, Mississippi and Amazon River basins is presented. In addition to the water budget, we include passive tracers to identify the geographic sources of water for the basins, and the analysis focuses...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20050136630 2023-05-15T17:09:41+02:00 Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins Chern, Jiun-Dar Bosilovich, Michael G. Unclassified, Unlimited, Publicly available [2005] application/pdf http://hdl.handle.net/2060/20050136630 unknown Document ID: 20050136630 http://hdl.handle.net/2060/20050136630 No Copyright CASI Meteorology and Climatology 2005 ftnasantrs 2018-06-09T23:01:24Z An atmospheric general circulation model simulation for 1948-1997 of the water budgets for the MacKenzie, Mississippi and Amazon River basins is presented. In addition to the water budget, we include passive tracers to identify the geographic sources of water for the basins, and the analysis focuses on the mechanisms contributing to precipitation recycling in each basin. While each basin s precipitation recycling has a strong dependency on evaporation during the mean annual cycle, the interannual variability of the recycling shows important relationships with the atmospheric circulation. The MacKenzie River basin has only a weak interannual dependency on evaporation, where the variations in zonal moisture transport from the Pacific Ocean can affect the basin water cycle. On the other hand, the Mississippi River basin has strong interannual dependencies on evaporation. While the precipitation recycling weakens with increased low level jet intensity, the evaporation variations exert stronger influence in providing water vapor for convective precipitation at the convective cloud base. High precipitation recycling is also found to be partly connected to warm SSTs in the tropical Pacific Ocean. The Amazon River basin evaporation exhibits small interannual variations, so that the interannual variations of precipitation recycling are related to atmospheric moisture transport from the tropical south Atlantic Ocean. Increasing SSTs over the 50-year period are causing increased easterly transport across the basin. As moisture transport increases, the Amazon precipitation recycling decreases (without real time varying vegetation changes). In addition, precipitation recycling from a bulk diagnostic method is compared to the passive tracer method used in the analysis. While the mean values are different, the interannual variations are comparable between each method. The methods also exhibit similar relationships to the terms of the basin scale water budgets. Other/Unknown Material Mackenzie river South Atlantic Ocean NASA Technical Reports Server (NTRS) Mackenzie River Pacific |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Chern, Jiun-Dar Bosilovich, Michael G. Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins |
topic_facet |
Meteorology and Climatology |
description |
An atmospheric general circulation model simulation for 1948-1997 of the water budgets for the MacKenzie, Mississippi and Amazon River basins is presented. In addition to the water budget, we include passive tracers to identify the geographic sources of water for the basins, and the analysis focuses on the mechanisms contributing to precipitation recycling in each basin. While each basin s precipitation recycling has a strong dependency on evaporation during the mean annual cycle, the interannual variability of the recycling shows important relationships with the atmospheric circulation. The MacKenzie River basin has only a weak interannual dependency on evaporation, where the variations in zonal moisture transport from the Pacific Ocean can affect the basin water cycle. On the other hand, the Mississippi River basin has strong interannual dependencies on evaporation. While the precipitation recycling weakens with increased low level jet intensity, the evaporation variations exert stronger influence in providing water vapor for convective precipitation at the convective cloud base. High precipitation recycling is also found to be partly connected to warm SSTs in the tropical Pacific Ocean. The Amazon River basin evaporation exhibits small interannual variations, so that the interannual variations of precipitation recycling are related to atmospheric moisture transport from the tropical south Atlantic Ocean. Increasing SSTs over the 50-year period are causing increased easterly transport across the basin. As moisture transport increases, the Amazon precipitation recycling decreases (without real time varying vegetation changes). In addition, precipitation recycling from a bulk diagnostic method is compared to the passive tracer method used in the analysis. While the mean values are different, the interannual variations are comparable between each method. The methods also exhibit similar relationships to the terms of the basin scale water budgets. |
author |
Chern, Jiun-Dar Bosilovich, Michael G. |
author_facet |
Chern, Jiun-Dar Bosilovich, Michael G. |
author_sort |
Chern, Jiun-Dar |
title |
Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins |
title_short |
Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins |
title_full |
Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins |
title_fullStr |
Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins |
title_full_unstemmed |
Simulation of Water Sources and Precipitation Recycling for the MacKenzie, Mississippi and Amazon River Basins |
title_sort |
simulation of water sources and precipitation recycling for the mackenzie, mississippi and amazon river basins |
publishDate |
2005 |
url |
http://hdl.handle.net/2060/20050136630 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Mackenzie River Pacific |
geographic_facet |
Mackenzie River Pacific |
genre |
Mackenzie river South Atlantic Ocean |
genre_facet |
Mackenzie river South Atlantic Ocean |
op_source |
CASI |
op_relation |
Document ID: 20050136630 http://hdl.handle.net/2060/20050136630 |
op_rights |
No Copyright |
_version_ |
1766065838654226432 |