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Acquisition probability differences in cloud coverage of the available Landsat observations over mainland southeast asia from 1986 to 2015

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International Journal of Digital Earth 2018年第5期11卷 437-450页

作者： Peng Li Zhiming Feng Chiwei Xiao Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijingPeople’s Republic of China College of Resources and Environment University of Chinese Academy of SciencesBeijingPeople’s Republic of China

Landsat data are the longest available records that consistently document global ***,the extent and degree of cloud coverage typically determine its usability,especially in the *** this study,scene-based metadata from the *** Survey Landsat inventories,ten-day,monthly,seasonal,and annual acquisition probabilities(AP)of targeted images at various cloud coverage thresholds(10%to 100%)were statistically analyzed using available Landsat TM,ETM+,and OLI observations over mainland southeast asia(MSEA)from 1986 to *** significant results were ***,the cumulative average acquisition probability of available Landsat observations over MSEA at the 30%cloud cover(CC)threshold was approximately 41.05%.Second,monthly and ten-day level probability statistics for the 30%CC threshold coincide with the temporal distribution of the dry and rainy *** demonstrates that Landsat images acquired during the dry season satisfy the requirements needed for land cover ***,differences in acquisition probabilities at the 30%CC threshold are different between the western and eastern regions of ***,the ability of TM,ETM+,and OLI to acquire high-quality imagery has gradually enhanced over time,especially during the dry season,along with consequently larger probabilities at lower CC thresholds.

关键词： Landsat cloud coverage(CC) acquisition probability(AP) mainland southeast asia land cover and land use changes

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Evaluation of six gauge-based gridded climate products for analyzing long-term historical precipitation patterns across the Lancang-Mekong River Basin

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Geography and Sustainability 2022年第1期3卷 85-103页

作者： Masoud Irannezhad Junguo Liu School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

Freshwater plays a vital role in global sustainability by improving human lives and protecting *** the Lancang-Mekong River Basin(LMRB),sustainable development is principally dependent upon precipitation that predominantly controls freshwater resources availability required for both life and livelihood of~70 million ***,this study comprehensively analyzed long-term historical precipitation patterns(in terms of trends,variability,and links to climate teleconnections)throughout the LMRB as well as its upper(Lancang River Basin,LRB)and lower(Mekong River Basin,MRB)parts employing six gauge-based gridded climate products:asian Precipitation Highly-Resolved Observational Data Integration Towards Evaluation of Water Resources(APHRODITE),Climate Prediction Center(CPC),Climate Research Unit(CRU),Global Precipitation Climatology Center(GPCC),Precipitation Reconstruction over Land(PRECL),and University of Delaware(UDEL).Accordingly,annual and seasonal(dry and wet)precipitation time series were calculated for three study periods:century-long outlook(1901-2010),mid-past(1951-2010),and recent decades(1981-2010).However,the role of climate teleconnections in precipitation variability over the LMRB was only identified during their available temporal coverages:mid-past and recent *** results generally showed that:(i)both annual and seasonal precipitation increased across all three basins in 1981-2010;(ii)wet and dry seasons got drier and wetter,respectively,in all basins in 1951-2010;(iii)all such changes were fundamentally attributed to increases in precipitation variability on both annual and seasonal scales over time;(iv)these variations were most strongly associated with the Pacific Decadal Oscillation(PDO),Atlantic Multi-decadal Oscillation(AMO)and East Pacific/North Pacific(EP/NP)pattern in the LMRB and the MRB during 1951-2010,but with the North Sea-Caspian Pattern(NCP)and the Southern Annular Mode(SAM)in the LRB;(v)such relationships got stronger in 1

关键词： Climate change Gauge-based precipitation datasets mainland southeast asia Oceanic-atmospheric circulation patterns Spatio-temporal trend analysis

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