Alaskan Permafrost Groundwater Storage Changes Derived from GRACE and Ground Measurements

作者：Muskett Reginald R^*; Romanovsky Vladimir E

来源：Remote Sensing, 2011, 3(2): 378-397.

DOI：10.3390/rs3020378

• permafrost
• Talik
• climate change
• groundwater changes
• Alaska
• GRACE

The Arctic is in transition from climate-driven thawing of permafrost. We investigate satellite-derived water equivalent mass changes, snow water equivalent with in situ measurements of runoff and ground-survey derived geoid models from 1999 through 2009. The Alaskan Arctic coastal plain groundwater storage (including wetland bog, thaw pond and lake) is increasing by 1.15 +/- 0.65 km(3)/a (area-average 1.10 +/- 0.62 cm/a), and Yukon River watershed groundwater storage is decreasing by 7.44 +/- 3.76 km(3)/a (area-average 0.79 +/- 0.40 cm/a). Geoid changes show increases within the Arctic coastal region and decreases within the Yukon River watershed. We hypothesize these changes are linked to the development of new predominately closed-and possibly open-talik in the continuous permafrost zone under large thaw lakes with increases of lakes and new predominately open-talik and reduction of permafrost extent in the discontinuous and sporadic zones with decreases of thaw lakes.

• 出版日期2011-2