Evaluation of remotely sensed rainfall products over Central Africa

[en] An intercomparison of seven gridded rainfall products incorporating satellite data (ARC, CHIRPS, CMORPH, PERSIANN, TAPEER, TARCAT, TMPA) is carried out over Central Africa, by evaluating them against three observed datasets: (a) the WaTFor database, consisting of 293 (monthly records) and 154 (daily records) rain-gauge stations collected from global datasets, national meteorological services and monitoring projects, (b) the WorldClim v2 gridded database, and (c) a set of stations expanded from the FAOCLIM network, these two latter sets describing climate normals. All products fairly well reproduce the mean rainfall regimes and the spatial patterns of mean annual rainfall, although with some discrepancies in the east–west gradient. A systematic positive bias is found in the CMORPH product. Despite its lower spatial resolution, TAPEER shows reasonable skills.When considering daily rainfall amounts, TMPA shows best skills, followed by CMORPH, but over the central part of the Democratic Republic of the Congo, TARCAT is amongst the best products. Skills ranking is however different at the interannual time-scale, with CHIRPS and TMPAperforming best, though PERSIANN has comparable skills when only fully independent stations are used as reference. A preliminary study of Southern Hemisphere dry season variability, from the example of Kinshasa, shows that it is a difficult variable to capture with satellite-based rainfall products. Users should still be careful when using any product in the most data-sparse regions, especially for trend assessment.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Camberlin, Pierre

Barraud, Geoffrey

Bigot, Sylvain

Dewitte, Olivier

Makanzu Imwangana, Fils

Maki Mateso, Jean-Claude

Martiny, Nadège

Monsieurs, Elise ; Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)

Moron, Vincent

Pellarin, Thierry

More authors (3 more)

Language :

English

Title :

Evaluation of remotely sensed rainfall products over Central Africa

Publication date :

11 April 2019

Journal title :

Quarterly Journal of the Royal Meteorological Society

ISSN :

0035-9009

eISSN :

1477-870X

Publisher :

Wiley-Blackwell, United States

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 08 May 2019

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Bibliography

Adler, R.F., Gu, G. and Huffman, G.J. (2012) Estimating climatological bias errors for the Global Precipitation Climatology Project (GPCP). Journal of Applied Meteorology and Climatology, 51(1), 84–99.
Ashouri, H., Hsu, K.L., Sorooshian, S., Braithwaite, D.K., Knapp, K.R., Cecil, L.D., Nelson, B.R. and Prat, O.P. (2015) PERSIANN-CDR: daily precipitation climate data record from multisatellite observations for hydrological and climate studies. Bulletin of the American Meteorological Society, 96(1), 69–83.
Awange, J.L., Ferreira, V.G., Forootan, E., Khandu, Andam-Akorful, S.A., Agutu, N.O. and He, X.F. (2016) Uncertainties in remotely sensed precipitation data over Africa. International Journal of Climatology, 36, 303–323. https://doi.org/10.1002/joc.4346.
Beighley, R.E., Ray, R.L., He, Y., Lee, H., Schaller, L., Andreadis, K.M., Durand, M., Alsdorf, D.E. and Shum, C.K. (2011) Comparing satellite derived precipitation datasets using the Hillslope River Routing (HRR) model in the Congo River basin. Hydrological Processes, 25, 3216–3229.
Bigot, S., Camberlin, P., Moron, V. and Richard, Y. (1997) Structures spatiales de la variabilité des précipitations en Afrique: une transition climatique à la fin des années 1960? Comptes Rendus de l'Académie des Sciences, 324, 181–188.
Boisier, J.P., Ciais, P., Ducharne, A. and Guimberteau, M. (2015) Projected strengthening of Amazonian dry season by constrained climate model simulations. Nature Climate Change, 5(7), 656–660.
Bombardi, R.J., Moron, V. and Goodnight, J.S. (2019) Detection, variability, and predictability of monsoon onset and withdrawal dates: a review. Climate Dynamics, in press.
Buarque, D.C., de Paiva, R.C.D., Clarke, R.T. and Mendes, C.A.B. (2011) A comparison of Amazon rainfall characteristics derived from TRMM, CMORPH and the Brazilian national raingauge network. Journal of Geophysical Research, 116, D19105. https://doi.org/10.1029/2011JD016060.
Bultot, F. (1971) Atlas climatique du bassin Congolais. Les composantes du bilan d'eau, Vol. 2. Brussels: Institut National pour l'Étude Agronomique du Congo, p. 25.
Camberlin, P., Castel, T., Richard, Y. and Williamson, D. (2011) Montagnes d'Afrique Tropicale: marqueurs de la variabilité climatique ou isolats climatiques? Proceedings, 24th Conference of the Association Internationale de Climatologie, Climat montagnard et risques, 6–11 September 2011, Rovereto, Italy: AIC / Università di Ferrara, pp. 129–134. https://hal.archives-ouvertes.fr/hal-00625600.
Camberlin, P. and Diop, M. (2003) Application of daily rainfall principal component analysis to the assessment of the rainy season characteristics in Senegal. Climate Research, 23(2), 159–169.
Camberlin, P., Janicot, S. and Poccard, I. (2001) Seasonality and atmospheric dynamics of the teleconnection between African rainfall and tropical ocean surface temperature: Atlantic vs. ENSO. International Journal of Climatology, 21, 973–1005.
Chambon, P., Jobard, I., Roca, R. and Viltard, N. (2013) An investigation of the error budget of tropical rainfall accumulation derived from merged passive microwave and infrared satellite measurements. Quarterly Journal of the Royal Meteorological Society, 139(673), 879–893.
Cohen Liechti, T., Matos, G.D.S.C., Pedro, J., Boillat, J.L. and Schleiss, A. (2012) Comparison and evaluation of satellite derived precipitation products for hydrological modeling of the Zambezi River basin. Hydrology and Earth System Sciences, 16, 489–500.
Dembélé, M. and Zwart, S.J. (2016) Evaluation and comparison of satellite-based rainfall products in Burkina Faso, West Africa. International Journal of Remote Sensing, 37(17), 3995–4014.
Dezfuli, A.K. (2017) Climate of Western and Central Equatorial Africa. Oxford Research Encyclopedia of Climate Science. Available at: http://climatescience.oxfordre.com [Accessed 23rd January 2019].
Diem, J.E., Hartter, J., Ryan, S.J. and Palace, M.W. (2014) Validation of satellite rainfall products for western Uganda. Journal of Hydrometeorology, 15, 2030–2038. https://doi.org/10.1175/JHM-D-13-0193.1.
Diem, J.E., Konecky, B.L., Salerno, J. and Hartter, J. (2019) Is equatorial Africa getting wetter or drier? Insights from an evaluation of long-term, satellite-based rainfall estimates for western Uganda. International Journal of Climatology. https://doi.org/10.1002/joc.6023.
Dinku, T., Funk, C., Peterson, P., Maidment, R., Tadesse, T., Gadain, H. and Ceccato, P. (2018) Validation of the CHIRPS satellite rainfall estimates over eastern Africa. Quarterly Journal of the Royal Meteorological Society, 144(S1), 292–312. https://doi.org/10.1002/qj.3244.
Dunning, C.M., Black, E.C. and Allan, R.P. (2016) The onset and cessation of seasonal rainfall over Africa. Journal of Geophysical Research: Atmospheres, 121(19), 11405–11424.
Ebert, E.E. (2007) Methods for verifying satellite precipitation estimates. In: Levizzani, V, Bauer, P. and Turk, F.J. (Eds.) Measuring Precipitation from Space: EURAINSAT and the Future. Dordrecht: Springer, pp. 345–356.
Engel, T., Fink, A.H., Knippertz, P., Pante, G. and Bliefernicht, J. (2017) Extreme precipitation in the west African cities of Dakar and Ouagadougou: atmospheric dynamics and implications for flood risk assessments. Journal of Hydrometeorology, 18(11), 2937–2957.
FAO. (2001) FAOCLIM 2.0 A World-Wide Agroclimatic Database. Rome: Food and Agriculture Organization of the United Nations. Available at: http://www.fao.org/nr/climpag/pub/en1102_en.asp [Accessed 25 April 2019].
Fick, S.E. and Hijmans, R.J. (2017) WorldClim 2: new 1-km spatial resolution climate surfaces for global land areas. International Journal of Climatology, 37(12), 4302–4315.
Fu, R., Yin, L., Li, W., Arias, P.A., Dickinson, R.E., Huang, L., Chakraborty, S., Fernandes, K., Liebmann, B., Fisher, R. and Myneni, R.B. (2013) Increased dry-season length over southern Amazonia in recent decades and its implication for future climate projection. Proceedings of the National Academy of Sciences, 110(45), 18110–18115.
Funk, C., Peterson, P., Landsfeld, M., Pedreros, D., Verdin, J., Shukla, S., Husak, G., Rowland, J., Harrison, L., Hoell, A. and Michaelsen, J. (2015) The climate hazards infrared precipitation with stations – a new environmental record for monitoring extremes. Scientific Data, 2, 150066.
Gosset, M., Alcoba, M., Roca, R., Cloché, S. and Urbani, G. (2018) Evaluation of TAPEER daily estimates and other GPM-era products against dense gauge networks in West Africa, analysing ground reference uncertainty. Quarterly Journal of the Royal Meteorological Society, 144(S1), 255–269. https://doi.org/10.1002/qj.3335.
Gosset, M., Viarre, J., Quantin, G. and Alcoba, M. (2013) Evaluation of several rainfall products used for hydrological applications over West Africa using two high-resolution gauge networks. Quarterly Journal of the Royal Meteorological Society, 139, 923–940.
Habib, E., ElSaadani, M. and Haile, A.T. (2012) Climatology-focused evaluation of CMORPH and TMPA satellite rainfall products over the Nile Basin. Journal of Applied Meteorology and Climatology, 51, 2105–2121.
Heaney, A., Little, E., Ng, S. and Shaman, J. (2016) Meteorological variability and infectious disease in Central Africa: a review of meteorological data quality. Annals of the New York Academy of Sciences, 1382(1), 31–43.
Hua, W., Zhou, L., Chen, H., Nicholson, S.E., Raghavendra, A. and Jiang, Y. (2016) Possible causes of the central equatorial African long-term drought. Environmental Research Letters, 11(12), 124002.
Huffman, G.J., Bolvin, D.T., Braithwaite, D., Hsu, K., Joyce, R., Xie, P. and Yoo, S.H. (2015) NASA global precipitation measurement (GPM) integrated multi-satellite retrievals for GPM (IMERG). Algorithm theoretical basis document, version 4, NASA, pp 30.
Huffman, G.J., Bolvin, D.T., Nelkin, E.J., Wolff, D.B., Adler, R.F., Gu, G., Hong, Y., Bowman, K.P. and Stocker, E.F. (2007) The TRMM multisatellite precipitation analysis (TMPA): quasi-global, multiyear, combined-sensor precipitation estimates at fine scales. Journal of Hydrometeorology, 8(1), 38–55.
Jackson, B., Nicholson, S.E. and Klotter, D. (2009) Mesoscale convective systems over western equatorial Africa and their relationship to large-scale circulation. Monthly Weather Review, 137(4), 1272–1294.
Joyce, R.J., Janowiak, J.E., Arkin, P.A. and Xie, P. (2004) CMORPH: a method that produces global precipitation estimates from passive microwave and infrared data at high spatial and temporal resolution. Journal of Hydrometeorology, 5(3), 487–503.
Kodama, Y.M., Katsumata, M., Mori, S., Satoh, S., Hirose, Y. and Ueda, H. (2009) Climatology of warm rain and associated latent heating derived from TRMM PR observations. Journal of Climate, 22(18), 4908–4929.
Kubota, T., Shige, S., Hashizume, H., Aonashi, K., Takahashi, N., Seto, S., Hirose, M., Takayabu, Y.N., Ushio, T., Nakagawa, K., Iwanami, K., Kachi, M. and Okamoto, K. (2007) Global precipitation map using satellite-borne microwave radiometers by the GSMaP project: production and validation. IEEE Transactions on Geoscience and Remote Sensing, 45(7), 2259–2275.
Lewis, S.L., Lopez-Gonzalez, G., Sonké, B., Affum-Baffoe, K., Baker, T.R., Ojo, L.O., Phillips, O.L., Reitsma, J.M., White, L., Comiskey, J.A. and Ewango, C.E. (2009) Increasing carbon storage in intact African tropical forests. Nature, 457(7232), 1003–1006.
Liebmann, B. and Marengo, J. (2001) Interannual variability of the rainy season and rainfall in the Brazilian Amazon Basin. Journal of Climate, 14(22), 4308–4318.
Lott, N., Vose, R., Del Greco, S.A., Ross, T., Worley, S. and Comeaux, J. (2008). The integrated surface database: partnerships and progress, in Proceedings of 88th AMS Annual Meeting, 20–24 January 2008, New Orleans, LA. American Meteorological Society, pp. 1–3.
Love, T.B., Kumar, V., Xie, P.P. and Thiaw, W. (2004). A 20-year daily Africa precipitation climatology using satellite and gauge data. Preprints, 14th Conference on Applied Climatology, Seattle, WA: American Meteorological Society, pp. 5.4.
Maidment, R.I., Allan, R.P. and Black, E. (2015) Recent observed and simulated changes in precipitation over Africa. Geophysical Research Letters, 42(19), 8155–8164.
Maidment, R.I., Grimes, D., Allan, R.P., Tarnavsky, E., Stringer, M., Hewison, T., Roebeling, R. and Black, E. (2014) The 30 year TAMSAT African Rainfall Climatology And Time series (TARCAT) data set. Journal of Geophysical Research: Atmospheres, 119(18), 10619–10644.
Maidment, R.I., Grimes, D., Black, E., Tarnavsky, E., Young, M., Greatrex, H., Allan, R.P., Stein, T., Nkonde, E., Senkunda, S. and Alcántara, E.M.U. (2017) A new, long-term daily satellite-based rainfall dataset for operational monitoring in Africa. Scientific Data, 4, 170063.
Maidment, R.I., Grimes, D.I., Allan, R.P., Greatrex, H., Rojas, O. and Leo, O. (2012) Evaluation of satellite-based and model re-analysis rainfall estimates for Uganda. Meteorological Applications, 20(3), 308–317.
Makanzu, I.F., Ozer, P. and Moyersons, J. (2014) Caractéristiques des pluies et ravinement dans la ville de Kinshasa de 1961 à 2010. Liège: Colloque International La Géographie Physique et les Risques Naturels. Available at: http://orbi.ulg.ac.be/handle/2268/169520 [Accessed 25 April 2019].
Malhi, Y., Adu-Bredu, S., Asare, R.A., Lewis, S.L. and Mayaux, P. (2013) African rainforests: past, present and future. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, 368, 20120312. https://doi.org/10.1098/rstb.2012.0312.
Maloba Makanga, J.D. (2009) Réseaux de mesures météorologiques au Gabon: pour quelle évaluation des changements climatiques? Annales de l'Université Omar Bongo, 14, 22.
Maussion, F., Scherer, D., Mölg, T., Collier, E., Curio, J. and Finkelnburg, R. (2014) Precipitation seasonality and variability over the Tibetan plateau as resolved by the high Asia reanalysis. Journal of Climate, 27, 1910–1927. https://doi.org/10.1175/JCLI-D-13-00282.1.
McCollum, J.R., Gruber, A. and Ba, M.B. (2000) Discrepancy between gauges and satellite estimates of rainfall in equatorial Africa. Journal of Applied Meteorology, 39(5), 666–679.
Menne, M.J., Durre, I., Vose, R.S., Gleason, B.E. and Houston, T.G. (2012) An overview of the global historical climatology network-daily database. Journal of Atmospheric and Oceanic Technology, 29(7), 897–910.
Monsieurs, E., Kirschbaum, D.B., Tan, J., Maki Mateso, J.C., Jacobs, L., Plisnier, P.D., Thiery, W., Umutoni, A., Musoni, D., Mugaruka Bibentyo, T., Ganza, G.B., Ilombe, G., Bagalwa, L., Kankurize, C., Michellier, C., Stanley, T., Kervyn, F., Kervyn, M., Demoulin, A. and Dewitte, O. (2018) Evaluating TMPA rainfall over the sparsely gauged East African rift. Journal of Hydrometeorology, 19(9), 1507–1528.
Munzimi, Y., Hansen, M., Adusei, B. and Senay, G. (2015) Characterizing Congo Basin rainfall and climate using TRMM satellite data and limited raingauge ground observations. Journal of Applied Meteorology and Climatology, 54, 541–556.
Ndjendolé, S. and Pérard, J. (2003) Estimation et spatialisation des durées de retour des fortes pluies en Centrafrique. Publications de l'Association Internationale de Climatologie, 15, 319–325.
Negrón Juárez, R.I., Li, W., Fu, R., Fernandes, K. and de Oliveira Cardoso, A. (2009) Comparison of precipitation datasets over the tropical south American and African continents. Journal of Hydrometeorology, 10(1), 289–299.
Nicholson, S.E. and Dezfuli, A.K. (2013) The relationship of rainfall variability in western equatorial Africa to the tropical oceans and atmospheric circulation. Part I: The boreal spring. Journal of Climate, 26(1), 45–65.
Nicholson, S.E., Klotter, D., Dezfuli, A.K. and Zhou, L. (2018) New rainfall datasets for the Congo Basin and surrounding regions. Journal of Hydrometeorology, 19, 1379–1396.
Novella, N.S. and Thiaw, W.M. (2013) African rainfall climatology version 2 for famine early warning systems. Journal of Applied Meteorology and Climatology, 52(3), 588–606.
Ouédraogo, D.Y., Fayolle, A., Gourlet-Fleury, S., Mortier, F., Freycon, V., Fauvet, N., Rabaud, S., Cornu, G., Bénédet, F., Gillet, J.F., Oslisly, R., Doucet, J.L., Lejeune, P. and Favier, C. (2016) The determinants of tropical forest deciduousness: disentangling the effects of rainfall and geology in Central Africa. Journal of Ecology, 104(4), 924–935.
Pellarin, T., Louvet, S., Gruhier, C., Quantin, G. and Legout, C. (2013) A simple and effective method for correcting soil moisture and precipitation estimates using AMSR-E measurements. Remote Sensing of Environment, 136, 28–36.
Peterson, T.C. and Vose, R.S. (1997) An overview of the global historical climatology network temperature database. Bulletin of the American Meteorological Society, 78, 2837–2849.
Pombo, S., de Oliveira, R.P. and Mendes, A. (2015) Validation of remote-sensing precipitation products for Angola. Meteorological Applications, 22(3), 395–409.
Roca, R., Chambon, P., Jobard, I., Kirstetter, P.E., Gosset, M. and Bergès, J.C. (2010) Comparing satellite and surface rainfall products over West Africa at meteorologically relevant scales during the AMMA campaign using error estimates. Journal of Applied Meteorology and Climatology, 49(4), 715–731.
Roca, R., Taburet, N., Lorant, E., Chambon, P., Alcoba, M., Brogniez, H., Cloché, H., Dufour, C., Gosset, M. and Guilloteau, C. (2018) Quantifying the contribution of the Megha-Tropiques mission to the estimation of daily accumulated rainfall in the Tropics. Quarterly Journal of the Royal Meteorological Society, 144(S1), 49–63. https://doi.org/10.1002/qj.3327.
Saatchi, S.S., Harris, N.L., Brown, S., Lefsky, M., Mitchard, E.T.A., Salas, W., Zutta, B.R., Buermann, W., Lewis, S.L., Hagen, S., Petrova, S., White, L., Silman, M. and Morel, A. (2011) Benchmark map of forest carbon stocks in tropical regions across three continents. Proceedings of the National Academy of Sciences, 108(24), 9899–9904.
Sahani, M., Moeyersons, J., Vandecasteele, I., Trefois, P. and Ozer, P. (2012) Evolution des caractéristiques pluviométriques dans la zone urbaine de Butembo (RDC) de 1957 à 2010. Geo-Eco-Trop: Revue Internationale de Géologie, de Géographie et d'Ecologie Tropicales, 36, 121–136.
Samba, G., Maloba Makanga, J.D. and Mbayi, R. (1999) Les saisons des pluies sur les plateaux Batéké et le plateau des Cataractes. Publications de l'Association Internationale de Climatologie, 12, 190–197.
Samba, G. and Nganga, D. (2012) Rainfall variability in Congo-Brazzaville: 1932–2007. International Journal of Climatology, 32(6), 854–873.
Scheel, M.L.M., Rohrer, M., Huggel, C., Santos Villar, D., Silvestre, E. and Huffman, G.J. (2011) Evaluation of TRMM multi-satellite precipitation analysis (TMPA) performance in the Central Andes region and its dependency on spatial and temporal resolution. Hydrology and Earth System Sciences, 15(8), 2649–2663.
Schumacher, C. and Houze, R.A., Jr. (2003) Stratiform rain in the Tropics as seen by the TRMM precipitation radar. Journal of Climate, 16(11), 1739–1756.
Serrat-Capdevila, A., Merino, M., Valdes, J.B. and Durcik, M. (2016) Evaluation of the performance of three satellite precipitation products over Africa. Remote Sensing, 8(10), 836.
Sylla, M.B., Giorgi, F., Coppola, E. and Mariotti, L. (2013) Uncertainties in daily rainfall over Africa: assessment of gridded observation products and evaluation of a regional climate model simulation. International Journal of Climatology, 33, 1805–1817. https://doi.org/10.1002/joc.3551.
Tang, G., Behrangi, A., Long, D., Li, C. and Hong, Y. (2018) Accounting for spatiotemporal errors of gauges: a critical step to evaluate gridded precipitation products. Journal of Hydrology, 559, 294–306.
Tesfamariam, B.G., Melgani, F. and Gessesse, B. (2019) Rainfall retrieval and drought monitoring skill of satellite rainfall estimates in the Ethiopian Rift Valley Lakes Basin. Journal of Applied Remote Sensing, 13(1), 014522. https://doi.org/10.1117/1.JRS.13.014522.
Thiemig, V., Rojas, R., Zambrano-Bigiarini, M., Levizzani, V. and De Roo, A. (2012) Validation of satellite-based precipitation products over sparsely gauged African River basins. Journal of Hydrometeorology, 13, 1760–1783. https://doi.org/10.1175/JHM-D-12-032.1.
Toté, C., Patricio, D., Boogaard, H., van der Wijngaart, R., Tarnavsky, E. and Funk, C. (2015) Evaluation of satellite rainfall estimates for drought and flood monitoring in Mozambique. Remote Sensing, 7(2), 1758–1776.
Verhegghen, A., Mayaux, P., Wasseige, C.D. and Defourny, P. (2012) Mapping Congo Basin vegetation types from 300 m and 1 km multi-sensor time series for carbon stocks and forest areas estimation. Biogeosciences, 9(12), 5061–5079.
Vondou, D.A. and Haensler, A. (2017) Evaluation of simulations with the regional climate model REMO over Central Africa and the effect of increased spatial resolution. International Journal of Climatology, 37(S1), 741–760.
Ward, E., Buytaert, W., Peaver, L. and Wheater, H. (2011) Evaluation of precipitation products over complex mountainous terrain: a water resources perspective. Advances in Water Resources, 34(10), 1222–1231.
Washington, R., James, R., Pearce, H., Pokam, W.M. and Moufouma-Okia, W. (2013) Congo Basin rainfall climatology: can we believe the climate models? Philosophical Transactions of the Royal Society B: Biological Sciences, 368(1625), 20120296.
Wehbe, Y., Ghebreyesus, D., Temimi, M., Milewski, A. and Al Mandous, A. (2017) Assessment of the consistency among global precipitation products over the United Arab Emirates. Journal of Hydrology: Regional Studies, 12, 122–135.
Wilks, D.S. (2011) Statistical Methods in the Atmospheric Sciences. San Diego, CA: Academic Press.
World Meteorological Organization (2009). Handbook on CLIMAT and CLIMAT TEMP Reporting. WMO/TD-No. 1188, Geneva.
Xie, P. and Arkin, P.A. (1997) Global precipitation: a 17-year monthly analysis based on gauge observations, satellite estimates, and numerical model outputs. Bulletin of the American Meteorological Society, 78, 2539–2558.
Zhou, L., Tian, Y., Myneni, R.B., Ciais, P., Saatchi, S., Liu, Y., Piao, S., Chen, H., Vermote, E., Song, C. and Hwang, T. (2014) Widespread decline of Congo rainforest greenness in the past decade. Nature, 509(7498), 86–90.