Remotely-sensed evapotranspiration estimates for an improved hydrological modeling of the early Holocene mega-lake Suguta, northern Kenya Rift
Remotely-sensed evapotranspiration estimates for an improved hydrological modeling of the early Holocene mega-lake Suguta, northern Kenya Rift
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遥感蒸散量估算，以改进肯尼亚北部裂谷早期全新世巨型湖苏古塔的水文模型
DOI：
10.1016/j.palaeo.2012.07.009
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Trauth
中科院分区：
文献类型：
--
作者：
Borchardt;Trauth
实际蒸散量是湖泊及其集水区水量平衡中一个重要但难以确定的因素。大多数湖泊盆地，特别是非洲偏远地区的湖泊盆地，没有可靠的蒸散数据，这些湖泊盆地已经进行了古气候重建和建模。利用TERRA卫星的14幅ASTER图像的热红外多光谱数据，估算了肯尼亚裂谷北方Suguta流域12,800 km 2的实际蒸散量。来自沉积物和古海岸线的证据表明，在非洲潮湿期（AHP，14.8至5.5 kyrs BP），这个山谷包含一个大湖泊，深280米，面积约2200平方公里，现在几乎已经消失。苏加塔盆地的蒸散量估计是使用陆地表面能量平衡算法（SEBAL）生成的。该模型所需的气候数据是从气候研究单位（英国东英吉利亚）获得的高分辨率网格数据集中提取的。结果表明，在集水区内的蒸散量（范围从450毫米/年，在盆地北部到2000毫米/年，在更高的地区）和降水量的显着的空间变化，是约20%的高层次分析法比在最近的时间。这些结果是在协议与其他估计的古降水在东非。湖泊系统的极端响应（水深比今天大280米，湖面面积为2200平方公里）仅适度增加降水说明了该地区对未来气候变化的可能敏感性。
The actual evapotranspiration is an important, but difficult to determine, element in the water balance of lakes and their catchment areas. Reliable data on evapotranspiration are not available for most lake basins for which paleoclimate reconstructions and modeling have been performed, particularly those in remote parts of Africa. We have used thermal infrared multispectral data for 14 ASTER scenes from the TERRA satellite to estimate the actual evapotranspiration in the 12,800km2catchment of the Suguta Valley, northern Kenya Rift. Evidence from sediments and paleo-shorelines indicates that, during the African Humid Period (AHP, 14.8 to 5.5kyrs BP), this valley contained a large lake, 280m deep and covering ~2200km2, which has now virtually disappeared. Evapotranspiration estimates for the Suguta Basin were generated using the Surface Energy Balance Algorithm for Land (SEBAL). Climate data required for the model were extracted from a high-resolution gridded dataset obtained from the Climatic Research Unit (East Anglia, UK). Results suggest significant spatial variations in evapotranspiration within the catchment area (ranging from 450mm/yr in the basin to the north to 2000mm/yr in more elevated areas) and precipitation that was ~20% higher during the AHP than in recent times. These results are in agreement with other estimates of paleo-precipitation in East Africa. The extreme response of the lake system (~280m greater water depth than today, and a lake surface area of 2200km2) to only moderately higher precipitation illustrates the possible sensitivity of this area to future climate change.
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DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
Philip A. Barker;Michael R. Talbot;F. Street;F. Marret;J. Scourse;E. Odada
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E. Odada
影响因子：
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作者：
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S. Hastenrath;J. Kutzbach
DOI：
--
发表时间：
2006
期刊：
--
影响因子：
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作者：
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通讯作者：
C. Conrad
影响因子：
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作者：
Olaka, Lydia A.;Odada, Eric O.;Olago, Daniel O.
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DOI：
--
发表时间：
1989
期刊：
影响因子：
--
作者：
A. Vincens
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A. Vincens