Groundwater storage changes in arctic permafrost watersheds from GRACE and in situ measurements
Groundwater storage changes in arctic permafrost watersheds from GRACE and in situ measurements
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DOI：
10.1088/1748-9326/4/4/045009
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发表时间：
2009-10-01
影响因子：
6.7
通讯作者：
Romanovsky, Vladimir E.
中科院分区：
文献类型：
--
作者：
Muskett, Reginald R.;Romanovsky, Vladimir E.
北极永久冻土区构成了冰冻圈的最大区域。重力恢复和气候实验（GRACE）任务的观测提供了对永久冻土区水团变化的更深入了解。我们研究了GRACE月时间序列、特殊扫描微波成像仪（SSM/I）的雪水当量、先进微波扫描辐射计（AMSR-E）的植被含水量和土壤湿度，以及Lena、叶尼塞、Ob’和Mackenzie流域的原位流量。GRACE水当量质量变化响应冬季积雪的质量加载和春夏径流的质量卸载。从GRACE到径流的长期趋势比较表明，勒拿河和叶尼塞河流域的地下水储量增加，麦肯齐河流域的地下水储量减少，Ob'流域的地下水储量保持不变。我们假设地下水储量的变化与连续多年冻土带的封闭和开放的发育以及流域断续多年冻土带的横向减少有关。
The Arctic permafrost regions make up the largest area component of the cryosphere. Observations from the Gravity Recovery and Climate Experiment (GRACE) mission offer to provide a greater understanding of changes in water mass within permafrost regions. We investigate a GRACE monthly time series, snow water equivalent from the special scanning microwave imager (SSM/I), vegetation water content and soil moisture from the advanced microwave scanning radiometer for the Earth observation system (AMSR-E) and in situ discharge of the Lena, Yenisei, Ob', and Mackenzie watersheds. The GRACE water equivalent mass change responded to mass loading by snow accumulation in winter and mass unloading by runoff in spring-summer. Comparison of secular trends from GRACE to runoff suggests groundwater storage increased in the Lena and Yenisei watersheds, decreased in the Mackenzie watershed, and was unchanged in the Ob' watershed. We hypothesize that the groundwater storage changes are linked to the development of closed-and open-talik in the continuous permafrost zone and the decrease of permafrost lateral extent in the discontinuous permafrost zone of the watersheds.