【摘要】：重力衛(wèi)星GRACE(gravity recovery and climate experiment)監(jiān)測斯堪的納維亞半島陸地水儲量變化會受到冰川均衡調(diào)整(GIA)信號的嚴重影響。首先根據(jù)該地區(qū)絕對重力和GPS并址觀測數(shù)據(jù)計算了GIA重力和垂直位移的實測線性比值,利用該比值和GPS網(wǎng)觀測的垂直位移速度場得到了GIA重力。然后,對GRACE觀測的重力變化速率進行GIA重力改正,進而可分離陸地水儲量變化趨勢,避免了使用GIA模型所帶來的巨大不確定性,并根據(jù)觀測數(shù)據(jù)完整估計了所得結(jié)果的不確定性。最后與水文模型作對比分析。結(jié)果表明,實測的GIA重力-垂直位移線性比值為0.148±0.020μGal/mm(1Gal=10-2 m/s2),該結(jié)果檢驗了Wahr的理論近似值且與北美實測的結(jié)果非常接近。2003年1月至2011年3月期間,斯堪的納維亞半島陸地水儲量存在明顯的增加趨勢,信號的主體位于半島南端的維納恩湖附近,總的水量增加速率為4.6±2.1km3/a,數(shù)據(jù)觀測期間的累積增加水量為38±17km3。研究結(jié)果與WGHM水文模型的結(jié)果有較好的一致性,相關(guān)系數(shù)達到0.69,而與GLDAS水文模型的相關(guān)性略小。
[Abstract]:Gravity recovery and Climate Experiment (GRACE) monitoring Scandinavian land water reserve changes can be severely affected by glacial equilibrium adjustment (GIA) signals. First, the measured linear ratio of GIA gravity and vertical displacement is calculated based on the absolute gravity and GPS observation data in the area, and the ratio is used with the GPS network. The GIA gravity is obtained from the observed vertical displacement velocity field. Then, the gravity change rate observed by GRACE is corrected by GIA gravity, and the change trend of terrestrial water reserves can be separated, thus avoiding the enormous uncertainties caused by the use of GIA model, and the uncertainty of the result is estimated completely according to the observed data. Finally, the results are compared with the hydrological model. The results show that the measured GIA gravity-vertical displacement linear ratio is 0.148+0.020 ugal/m m (1Gal=10-2 m/s2), which verifies the theoretical approximation of Wahr and is very close to the measured results in North America. The main body is located near Lake Venant at the southern end of the peninsula. The total water increment rate is 4.6+2.1 km 3/a. The cumulative water increment during the data observation period is 38+17 km 3.
【作者單位】： 地殼運動監(jiān)測工程研究中心;中國科學(xué)院測量與地球物理研究所大地測量與地球動力學(xué)國家重點實驗室;
【基金】：地震科技星火計劃(XH15057) 國家自然科學(xué)基金(41204013;41274026) 國家973計劃(2012CB957703)~~
【分類號】：P22;P332

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