 |
| Titel |
High-Resolution Geoid-Derived Groundwater Storage Changes in Alaska, U.S.A. and Yukon Territory, Canada, from 1999 through 2009 with Comparison to GRACE |
| VerfasserIn |
Reginald Muskett |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250032793
|
|
|
|
|
|
| Zusammenfassung |
| Permafrost and talik (earth material within permafrost whose temperature is above the
freezing point of water) in Arctic watersheds have significant effects on surface and
groundwater hydrology. We investigate water equivalent mass changes in Alaska, U.S.A. and
western Yukon Territory, Canada, using high-resolution geoid models to derive net water
equivalent changes from 1999 through 2009 and GRACE monthly water equivalent
changes, snow water equivalent and watershed runoff from August 2002 through
December 2008. High-resolution geoid difference-derived water equivalent mass
changes show increases in groundwater storage in the northern Arctic coastal plain of
2.95 ± 1.97 km3/a (area-average 2.83 ± 1.89 cm/a) and decreases in groundwater
storage in the Yukon River watershed of 7.06 ± 1.04 km3/a (area-average 0.78 ±
0.11 cm/a) from 1999 through 2009. This compares well with GRACE-derived
water equivalent mass changes indicating the Arctic coastal plain groundwater
storage (including wetland bog, thaw pond and lake) gain of 1.15 ± 0.65 km3/a
(area-average 1.10 ± 0.62 cm/a), and Yukon River watershed groundwater storage loss of
7.44 ± 3.76 km3/a (area-average 0.79 ± 0.40 cm/a) from August 2002 through
December 2008. We hypothesize these changes are linked to the development of new
predominately closed- and possibly open-taliks in the continuous permafrost zone under
thaw lakes with increases of thaw bogs, ponds and lakes and new predominately
open-taliks and reduction of permafrost extent in the discontinuous and sporadic
zones with decreases of thaw bogs, ponds and lakes of Alaska and western Yukon. |
|
|
|
|
|
|