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近年来雅鲁藏布江流域气候、冰川波动及河流水资源变化研究
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摘要
本研究以气象数据(主要为气温、降水)、基础地理数据、中国冰川信息系统数据库(1:10万)、DEM数据、遥感影像数据及前人研究结果为基础,运用GIS空间插值技术、气象统计方法及R/S分析法,对雅鲁藏布江流域近30年来气候(着眼于降水和气温指标)时空变化特征及未来变化趋势进行了研究;综合运用RS、GIS技术,获取了流域不同朝向上冰川面积分布、冰川面积随高度带分布状况统计结果,定量分析了典型冰川年内季节性变化及近几十年变化状况,并结合前人研究结果统计分析了整个流域内冰川变化状况;在上述研究结果及前人研究基础上,对雅鲁藏布江流域气候变化背景下,冰川及河流水资源响应状况进行了探索分析。研究主要得出以下结论:
     (1)1978—2009年间,流域范围内多年平均降水大致趋势为由西至东逐步增加,年平均降水量以7.935mm/10a的速度缓慢增加.流域多年平均气温大致由河源至下游逐渐升高,河谷腹地至流域边界处逐渐降低,并出现了以拉萨、乃东为中心的局部高温带;近32年流域年平均气温增加2.2℃,增加幅度达到0.489℃/10a(通过了99%的显著性检验),高于全球及全国增温速率。近10年间,流域平均降水以-139mm/10a的速度显著减少,气温则以1.14℃/10a的速度增加,整个流域气候呈现暖干趋势。利用R/S分析法预测得知,流域年降水量可能出现短时间的减少波动,但未来较长一段时间内,流域降水及气温仍将保持增加趋势,流域气候呈现暖湿化趋势。
     (2)不同朝向上的冰川面积从大到小依次为北、东北、东、南、西北、东南、西南、西,偏北向、偏西向冰川分布高度范围分别小于偏南向、偏东向;流域内冰川分布的高度范围大约为4600m左右,最大面积高度区间为5300-5500m。以编号50258A0023的冰川为研究对象,其消融期主要集中在5、6月份至10月份左右,积累期主要集中在11月份至次年的4、5月份。1976—1988年期间,流域东部21座大型海洋性冰川出现退缩现象,总面积从1434.4km2减少到1283.4km2,退缩年平均速率为0.810%·a-1;1988—2005年,这批大型冰川呈现出相反的波动状况,总面积从1283.4km2增加到1416.5km2,冰川前进年平均速率为0.576%·a-1;但总的看来,在1976-2005年30年间,这21座大型冰川总面积减少了17.9km2,占1976年冰川总面积的1.25%,冰川呈现不显著的退缩。对本文及前人研究结果进行总结,发现近几十年流域内冰川普遍呈现退缩趋势,仅少数冰川呈现前进状态。
     (3)以21座大型海洋性冰川为例,对气候变化背景下冰川的响应进行分析,得出:气温升高虽导致这些冰川的退缩,但降水的增加削弱或者抵消了气温升高带来的不利影响,这种气候变化状况可能是导致这些大型冰川在1976-2005年间前进退缩状况均不显著的主要原因。冰川面积变化受正积温、降水二者影响,三者之间有必然的响应关系,然而流域内各地域间响应关系具有一定差异性;某些冰川群对降水的敏感性高于气温。
     (4)依据流域多年水量平衡的假定,雅鲁藏布江流域河川径流量受气候(气温、降水、积雪,蒸发)、冰川变化波动的影响而呈现阶段性的变化。近几十年来在气温升高、降水增加、积雪量增加、蒸发减少的大背景下下,流域河川径流量响应气候、冰川变化呈现增加趋势。
Taking the best use of meteorological data (mainly the temperature and precipitation observation data), basic geographic information, dataset of China glacier information system (1:100000), digital elevation model (DEM), remote sensing images collected in the Yarlung Zangbo River basin in association with the reference of the relevant achievements obtained in the past by pioneer studies in the region, comprehensive and systematic studies concerning with spatial and temporal variation characteristics of climate (focus on rainfall and temperature index) and their future tendency over the Yarlung Zangbo river basin during the past30years were conducted by means of the GIS spatial interpolation techniques, meteorological statistics method and R/S analysis...etc. First of all, by using RS and GIS techniques, the orientational and the altitudinal distribution of glacier areas in the Yarlung Zangbo River basin were comprehensively analyzed, and the seasonal fluctuation and interannual variation of typical glaciers were quantitatively studied. In combination of the research results concerning with glacier fluctuations and glacier inventory materials, the glacier variations related to equivabrium line fluctuations, glacier area and volume changes in long term as well as the long term climatic spatial and temporal variations were studied. Based on the above research results and the previous studies, the responses of glaciers and river water resources to the climate change in the Yarlung Zangbo river basin were systematically studied. The main conclusions obtained through this study can be summarized as follows:
     (1) From1978to2009, precipitation within the watershed roughly increased from west to east, and the basin scale averaged precipitation insignificantly increased at the speed of7.935mm/10a. Annual mean temperature increased gradually from the river source area to down-streams and from the basin boundary to hinterland with an exception for a local high-temperature zone emerged over the Lhasa city and the Naidong area. In32years from1978 to2009, annual mean temperature increased about2.2℃with the increase rate of0.489℃/10a (through99%significance test), which is obviously higher than the reported global temperature increase rate as well as for whole China. Over the past10years, the basin scale averaged precipitation notably reduced with a speed of-139mm/10a, while the temperature tended to increase with a speed of1.14℃/10a, which implies the whole watershed tended to be much warm and dry in the recent decade. In addition, according to the R/S analyses, Hurst index of the32years (from1978to2009) predicted that air temperature and precipitation would increase in some period in the future, and the climate over the basin would tend to be much warm and wet.
     (2) The distribution of glacier areas in the Yarlung Zangbo River basin from large to small is found orientated in order northeast, north, south, east, northwest, southeast and southwest, west. The altitudinal range in the partial north and west are respectively smaller than in the partial south and east. The altitudinal distribution of the glacier in the basin is about4600m, and the altitudinal interval between5300and5500m has the biggest glacier area developed. Taking No.5O258A0023glacier as a typical example, the glacier ablation period mainly concentrated from May、June to October while the accumulated phase mainly taken place from November to next year's April、May. From1976to1988,21large maritime glaciers in the eastern river basin retreated, and the total glacier areas shrunk from1434.4km2to1283.4km2, with the annual diminution rate of0.810%. But from1988to2005, this group of large glaciers exhibited the reverse fluctuation trend with glacier areas increased from1283.4km2to1416.5km2in total at the annual rise rate of0.810%. On the whole, however, from1976to2005, the area of21large maritime glaciers reduced17.9km2, accounting for1.25%of the total area of glaciers in1976, so glacier appeared no significant retreat. Summarizing the results of previous studies and my research results, we can find out that most glaciers in the basin tended to slight retreat in general.
     (3) Taking21maritime glaciers as example, of climate change, the response of glaciers to climate change was analyzed. The conclusion is as following. Though the increasing temperature over the Yarlung Zangbo river basin tended to result in these glaciers retreat in general, but the increase of precipitation over the same period weaken or even offset the negative influence of the rising temperature. Increasing temperature plus increasing precipitation may be the main reason accounts for the glacier changes in the studied basin exhibited non-significant progress or retreat from1976to2005. Glacier change is influenced by accumulative temperature, precipitation, and there is inevitable response relationship among these three factors, which is found different in diverse regions. Some glaciers have been found changed more sensitive to the precipitation than to temperature.
     (4) According to the water balance equation of the Yarlung Zangbo river basin, its river runoff is affected by climate (temperature, precipitation, snow, and evaporation) and glacier change. For decades in the background of the rising temperature, the increasing precipitation and snow and decreasing evaporation over the basin, river runoff presented the increasing trend to response the climate and glacier changes.
引文
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