 |
| Titel |
Variability of moisture recycling using a precipitationshed framework |
| VerfasserIn |
P. W. Keys, E. A. Barnes, R. J. van der Ent, L. J. Gordon |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 10 ; Nr. 18, no. 10 (2014-10-07), S.3937-3950 |
| Datensatznummer |
250120489
|
| Publikation (Nr.) |
 copernicus.org/hess-18-3937-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Recent research has revealed that upwind land-use changes can significantly
influence downwind precipitation. The precipitationshed (the upwind ocean and
land surface that contributes evaporation to a specific location's
precipitation) may provide a boundary for coordination and governance of
these upwind–downwind water linkages. We aim to quantify the variability of
the precipitationshed boundary to determine whether there are persistent and
significant sources of evaporation for a given region's precipitation. We
identify the precipitationsheds for three regions (i.e., western Sahel,
northern China, and La Plata) by tracking atmospheric moisture with a
numerical water transport model (Water Accounting Model-2layers, or WAM-2layers) using gridded fields from both
the ERA-Interim (European Reanalysis Interim) and MERRA (Modern-Era Retrospective Analysis for
Research and Applications) reanalyses. Precipitationshed variability is
examined first by diagnosing the persistence of the evaporation contribution
and second with an analysis of the spatial variability of the evaporation
contribution. The analysis leads to three key conclusions: (1) a core
precipitationshed exists; (2) most of the variance in the precipitationshed
is explained by a pulsing of more or less evaporation from the core
precipitationshed; and (3) the reanalysis data sets agree reasonably well,
although the degree of agreement is regionally dependent. Given that much of
the growing-season evaporation arises from within a core precipitationshed
that is largely persistent in time, we conclude that the precipitationshed
can potentially provide a useful boundary for governing land-use change on
downwind precipitation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|