Intercomparison of annual precipitation indices and extremes over global land areas from in situ, space-based and reanalysis products

被引:122
作者
Alexander, Lisa, V [1 ,2 ]
Bador, Margot [1 ,2 ]
Roca, Remy [3 ]
Contractor, Steefan [4 ]
Donat, Markus G. [5 ]
Nguyen, Phuong Loan [1 ,2 ]
机构
[1] UNSW Sydney, Climate Change Res Ctr, Sydney, NSW 2052, Australia
[2] UNSW Sydney, ARC Ctr Excellence Climate Extremes, Sydney, NSW 2052, Australia
[3] Lab Etud Geophys & Oceanog Spatiales, Toulouse, France
[4] UNSW Sydney, Sch Math & Stat, Sydney, NSW 2052, Australia
[5] BSC, Carrer Jordi Girona 29-31, E-08034 Barcelona, Spain
基金
澳大利亚研究理事会;
关键词
global observations; guage-based; satellite; reanalyses; precipitation; intercomparison; GRIDDED PRECIPITATION; TEMPERATURE; RESOLUTION; SATELLITE; GAUGE; RAIN;
D O I
10.1088/1748-9326/ab79e2
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A range of in situ, satellite and reanalysis products on a common daily 1 degrees x 1 degrees latitude/longitude grid were extracted from the Frequent Rainfall Observations on Grids database to help facilitate intercomparison and analysis of precipitation extremes on a global scale. 22 products met the criteria for this analysis, namely that daily data were available over global land areas from 50 degrees S to 50 degrees N since at least 2001. From these daily gridded data, 10 annual indices that represent aspects of extreme precipitation frequency, duration and intensity were calculated. Results were analysed for individual products and also for four cluster types: (i) in situ, (ii) corrected satellite, (iii) uncorrected satellite and (iv) reanalyses. Climatologies based on a common 13-year period (2001-2013) showed substantial differences between some products. Timeseries (which ranged from 13 years to 67 years) also highlighted some substantial differences between products. A coefficient of variation showed that the in situ products were most similar to each other while reanalysis products had the largest variations. Reanalyses however agreed better with in situ observations over extra-tropical land areas compared to the satellite clusters, although reanalysis products tended to fall into 'wet' and 'dry' camps overall. Some indices were more robust than others across products with daily precipitation intensity showing the least variation between products and days above 20 mm showing the largest variation. In general, the results of this study show that global space-based precipitation products show the potential for climate scale analyses of extremes. While we recommend caution for all products dependent on their intended application, this particularly applies to reanalyses which show the most divergence across results.
引用
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页数:12
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