Analyses of the relationship between drought occurrences and their causal factors in Tigray Region, Northern Ethiopia

References

• Abraha, M. E. 2013. Assessment of drought early warning in Ethiopia: A comparison of WRSI by surface energy balance and soil water balance. M.Sc. Thesis, University of Twente, Netherlands.
   Google Scholar
• Anyamba, A. and Tucker, C. J. 2005. Analyses of Sahelian vegetation dynamics using NOAA-AVHRR NDVI data from 1981–2003. J. Arid Environ. 63, 596–614. doi:10.1016/j.jaridenv.2005.03.007
   Google Scholar
• Appelhans, T. and Nauss, T. 2016. Spatial patterns of sea surface temperature influences on East African precipitation as revealed by empirical orthogonal teleconnections. Front. Earth Sci. 4, 1–8.
   Google Scholar
• Atlas, R., Wolfson, N. and Terry, J. 1993. The effect of SST and soil moisture anomalies on GLA model simulations of the 1988 U.S. summer drought. J. Climate 6, 2034–2048. doi:10.1175/1520-0442(1993)006<2034:TEOSAS>2.0.CO;2
   Google Scholar
• Audu, M. O., Isikwue, B. C. and Eweh, J. E. 2014. Estimation of seasonal and annual albedo of the earth’s atmosphere over Kano, Nigeria. IOSR J. Appl. Phys. 6, 56–62.
   Google Scholar
• Ayoade, J. O. 2008. Techniques in Climatology. Stirling-Horden Publishers Ltd., Ibadan.
   Google Scholar
• Banzon, V., Smith, T. M., Mike Chin, T., Liu, C. and Hankins, W. 2016. A long-term record of blended satellite and in situ sea-surface temperature for climate monitoring, modelling and environmental studies. Earth Syst. Sci. Data 8, 165–176. doi:10.5194/essd-8-165-2016
   Google Scholar
• Barnston, A. G., Chelliah, M. and Goldenberg, S. B. 1997. Documentation of a highly ENSO-related SST région in thé equatorial Pacific. Atm-Ocean 35, 367–383.
   Google Scholar
• Belay, K. T., Van Rompaey, A., Poesen, J., Van Bruyssel, S., Deckers, J. and co-authors. 2015. Spatial analyses of land cover changes in eastern Tigray (Ethiopia) from 1965 to 2007: are there signs of a forest transition? Land Degrad. Develop. 26, 680–689. doi:10.1002/ldr.2275
   Google Scholar
• Benas, N. and Chrysoulakis, N. 2014. Estimation of land surface albedo time series and trends based on MODIS data. In: Proceedings of Remote Sensing for Agriculture, Ecosystems, and Hydrology XVI, 9239, 92390Q.
   Google Scholar
• Biswas, M., Mukhopadhyay, M. and Ghosh, A. K. 2014. A distribution-free two-sample run test applicable to high-dimensional data. Biomet 101, 913–926. doi:10.1093/biomet/asu045
   Google Scholar
• Bojinski, S., Verstraete, M., Peterson, T. C., Richter, C., Simmons, A. and co-authors. 2014. The concept of essential climate variables in support of climate research, applications, and policy. Bull. Amer. Meteor. Soc. 95, 1431–1443. doi:10.1175/BAMS-D-13-00047.1
   Google Scholar
• Bounoua, L., Collatz, G. J., Los, S. O., Sellers, P. J., Dazlich, D. A. and co-authors. 2000. Sensitivity of climate to changes in NDVI. J. Climate 13, 2277–2292. doi:10.1175/1520-0442(2000)013<2277:SOCTCI>2.0.CO;2
   Google Scholar
• Bunge, L. and Clarke, A. J. 2009. A verified estimation of the El Ninõ index Ninõ-3.4 since 1877. J. Climate 22, 3979–3992. doi:10.1175/2009JCLI2724.1
   Google Scholar
• Cane, M. A., Clement, A. C., Kaplan, A., Kushnir, Y., Pozdnyakov, D. and co-authors. 1997. Twentieth-century sea surface temperature trends. Science 275, 957–960. doi:10.1126/science.275.5302.957
   Google Scholar
• Cardinal, D., Gaillardet, J., Hughes, H. J., Opfergelt, S. and André, L. 2010. Contrasting silicon isotope signatures in rivers from the congo basin and the specific behaviour of organic-rich waters. Geophys. Res. Lett. 37, 1–6.
   Google Scholar
• Chaidez, V., Dreano, D., Agusti, S., Duarte, C. M. and Hoteit, I. 2017. Decadal trends in Red Sea maximum surface temperature. Sci. Rep. 7, 1–8.
   Google Scholar
• Charney, J., Stone, P. H. and Quirk, W. J. 1975. Drought in the Sahara: a biogeophysical feedback mechanism. Science 187, 434–435. doi:10.1126/science.187.4175.434
   Google Scholar
• Charney, J., Quirk, W. J., Chow, S. and Kornfield, J. 1977. A comparative study of the effects of albedo change on drought in semi-arid regions. J. Atmos. Sci. 34, 1366–1385. doi:10.1175/1520-0469(1977)034<1366:ACSOTE>2.0.CO;2
   Google Scholar
• Chowdhury, M. R. 2003. The El Niño-Southern Oscillation (ENSO) and seasonal flooding - Bangladesh. Theor. Appl. Clim. 76, 105–124. doi:10.1007/s00704-003-0001-z
   Google Scholar
• Chuai, X. W., Huang, X. J., Wang, W. J. and Bao, G. 2013. NDVI, temperature and precipitation changes and their relationships with different vegetation types during 1998-2007 in Inner Mongolia, China. Int. J. Climatol. 33, 1696–1706. doi:10.1002/joc.3543
   Google Scholar
• Climate Prediction Center. 2005. Climate Prediction Center - Southern Oscillation Index. Online at: https://www.cpc.ncep.noaa.gov/products/analyses_monitoring/ensocycle/soi.shtml
   Google Scholar
• Coakley, J. A. 2003. Reflectance and albedo, surface. In: Encyclopedia of Atmospheric Sciences. 2nd ed. Elsevier, New York, pp. 1914–1923.
   Google Scholar
• Courel, M. F., Kandel, R. S. and Rasool, S. I. 1984. Surface albedo and the Sahel drought. Nature 307, 528–531. doi:10.1038/307528a0
   Google Scholar
• De Ridder, K. 1998. The impact of vegetation cover on sahelian drought persistence. Bound. Meteorol. 88, 307–321. doi:10.1023/A:1001106728514
   Google Scholar
• Deo, R. C., Syktus, J. I., McAlpine, C. A., Lawrence, P. J., McGowan, H. A. and co-authors. 2009. Impact of historical land cover change on daily indices of climate extremes including droughts in eastern Australia. Geophys. Res. Lett 36, 1–5.
   Google Scholar
• Deser, C., Phillips, A. S. and Alexander, M. A. 2010. Twentieth century tropical sea surface temperature trends revisited. Geophys. Res. Lett. 37, 1–6.
   Google Scholar
• Dobos, E. 2011. Albedo. In Encyclopedia of Soil Science. 2nd ed. Springer, Berlin.
   Google Scholar
• Edwards, D. C. and McKee, T. B. 1997. Characteristics of 20th century drought in the United States at multiple time scales. M.Sc. Thesis. Colorado State University, Fort Collins, Colorado.
   Google Scholar
• El Kenawy, A. M., McCabe, M. F., Vicente-Serrano, S. M., López-Moreno, J. I. and Robaa, S. M. 2016. Changes in the frequency and severity of hydrological droughts over Ethiopia from 1960 to 2013. Cuad. Invest. Geog. 42, 145–166.
   Google Scholar
• Eso, M., Kuning, M., Green, H., Ueranantasun, A. and Chuai-Aree, S. 2016. The Southern Oscillation Index as a random walk. Walailak J. Sci. Tech. 13, 317–327.
   Google Scholar
• Evans, J. P., Meng, X. and McCabe, M. F. 2017. Land surface albedo and vegetation feedbacks enhanced the millennium drought in south-east Australia. Hydrol. Earth Syst. Sci. 21, 409–422. doi:10.5194/hess-21-409-2017
   Google Scholar
• Feng, S., Oglesby, R. J., Rowe, C. M., Loope, D. B. and Hu, Q. 2008. Atlantic and Pacific SST influences of medieval drought in North America simulated by the Community Atmospheric Model. J. Geophys. Res. Atmo. 113, 1–14.
   Google Scholar
• Fensham, R. J., Fairfax, R. J. and Archer, S. R. 2005. Rainfall, land use and woody vegetation cover change in semi-arid Australian savanna. J. Ecology 93, 596–606. doi:10.1111/j.1365-2745.2005.00998.x
   Google Scholar
• Fuller, D. O. and Ottke, C. 2002. Land cover, rainfall and land-surface albedo in West Africa. Clim. Change 54, 181–204. doi:10.1023/A:1015730900622
   Google Scholar
• Gebrehiwot, T., van der Veen, A. and Maathuis, B. 2011. Spatial and temporal assessment of drought in the Northern highlands of Ethiopia. Int. J. Appl. Earth Obs. Geoinf 13, 309–321. doi:10.1016/j.jag.2010.12.002
   Google Scholar
• Gergis, J. L. and Fowler, A. M. 2005. Classification of synchronous oceanic and atmospheric El Niño-Southern Oscillation (ENSO) events for palaeoclimate reconstruction. Int. J. Climatol. 25, 1541–1565. doi:10.1002/joc.1202
   Google Scholar
• Gul, M., Kotak, Y., Muneer, T. and Ivanova, S. 2018. Enhancement of albedo for solar energy gain with particular emphasis on overcast skies. Energies 11, 2881. doi:10.3390/en11112881
   Google Scholar
• Harris, I. C. and Jones, P. D. 2017. Climatic Research Unit (CRU) Time-Series (TS) version 4.01 of high-resolution gridded data of month-by-month variation in climate (Jan. 1901- Dec. 2016). Centre for Environmental Data Analysis.
   Google Scholar
• Henderson-Sellers, A. and Hughes, N. A. 1982. Albedo and its importance in climate theory. Progr. Phys. Geog. 6, 1–44. doi:10.1177/030913338200600101
   Google Scholar
• Herrmann, S. M., Anyamba, A. and Tucker, C. J. 2005. Recent trends in vegetation dynamics in the African Sahel and their relationship to climate. Global Environ. Change 15, 394–404. doi:10.1016/j.gloenvcha.2005.08.004
   Google Scholar
• Hoell, A. and Funk, C. 2013. The ENSO-related West Pacific Sea surface temperature gradient. J. Climate 26, 9545–9562. doi:10.1175/JCLI-D-12-00344.1
   Google Scholar
• Hoerling, M. and Kumar, A. 2003. The perfect ocean for drought. Science 299, 691–694. doi:10.1126/science.1079053
   Google Scholar
• Hu, B., Lucht, W., Strahler, A. H., Barker Schaaf, C. and Smith, M. 2000. Surface albedos and angle-corrected NDVI from AVHRR observations of South America. Rem.Sens. Environ. 71, 119–132. doi:10.1016/S0034-4257(99)00050-4
   Google Scholar
• Interstate Technology Regulatory Council. 2013. Groundwater statistics and monitoring compliance - statistical tools for the project life cycle - Guidance document.
   Google Scholar
• Janicot, S., Moron, V. and Fontaine, B. 1996. Sahel droughts and Enso dynamics. Geophys. Res. Lett. 23, 515–518. doi:10.1029/96GL00246
   Google Scholar
• Juszak, I., Erb, A. M., Maximov, T. C. and Schaepman-Strub, G. 2014. Arctic shrub effects on NDVI, summer albedo and soil shading. Rem. Sens. Environ. 153, 79–89. doi:10.1016/j.rse.2014.07.021
   Google Scholar
• Kidwell, A., Han, L., Jo, Y. H. and Yan, X. H. 2017. Decadal Western Pacific warm pool variability: a centroid and heat content study. Scient. Reports 7, 1–9.
   Google Scholar
• Kiros, A. 2014. GIS and RS based assessment of area exclosure and vegetation cover change in KoraroTabia, HawzenWoreda. Ph.D. Thesis. Mekelle University.
   Google Scholar
• Knaff, J. A. and Landsea, C. W. 1997. An El Niño–Southern Oscillation Climatology and Persistence (CLIPER) forecasting scheme. Wea. Forecasting 12, 633–652. doi:10.1175/1520-0434(1997)012<0633:AENOSO>2.0.CO;2
   Google Scholar
• Konnen, G. P., Jones, P. D., Kaltofen, M. H. and Allan, R. J. 1998. Pre-1866 extensions of the Southern Oscillation Index using early Indonesian and Tahitian meteorological readings. J. Climate 11, 2325–2339. doi:10.1175/1520-0442(1998)011<2325:PEOTSO>2.0.CO;2
   Google Scholar
• Kravitz, B., Rasch, P. J., Wang, H., Robock, A., Gabriel, C. and co-authors. 2018. The climate effects of increasing ocean albedo: an idealized representation of solar geoengineering. Atmos. Chem. Phys. 18, 13097–13113. doi:10.5194/acp-18-13097-2018
   Google Scholar
• Laux, P., Nguyen, P. N. B., Cullmann, J. and Kunstmann, H. 2017. Impacts of land-use/land-cover change and climate change on the regional climate in the central vietnam. In: Land Use and Climate Change Interactions in Central Vietnam (eds. A. Nauditt and L. Ribbe). Springer, Singapore, pp. 143–151.
   Google Scholar
• Levitus, S., Antonov, J. I., Boyer, T. P. and Stephens, C. 2000. Warming of the World Ocean. Science 287, 2225–2229. doi:10.1126/science.287.5461.2225
   Google Scholar
• Li, Z. and Guo, X. 2012. Detecting Climate effects on vegetation in northern mixed prairie using NOAA AVHRR 1-km time-series NDVI data. Rem. Sens. 4, 120–134. doi:10.3390/rs4010120
   Google Scholar
• Lin, Z. and Li, Y. 2012. Remote influence of the tropical Atlantic on the variability and trend in North West Australia summer rainfall. J. Climate 25, 2408–2420. doi:10.1175/JCLI-D-11-00020.1
   Google Scholar
• Liu, W. T. and Kogan, F. N. 1996. Monitoring regional drought using the vegetation condition index. Int. J. Rem. Sens. 17, 2761–2782. doi:10.1080/01431169608949106
   Google Scholar
• Lofgren, B. M. 1995. Surface albedo–climate feedback simulated using two-way coupling. J. Climate 8, 2543–2562. doi:10.1175/1520-0442(1995)008<2543:SAFSUT>2.0.CO;2
   Google Scholar
• Lu, J. 2009. The dynamics of the Indian Ocean sea surface temperature forcing of Sahel drought. Clim. Dyn. 33, 445–460. doi:10.1007/s00382-009-0596-6
   Google Scholar
• Lu, J. and Delworth, T. L. 2005. Oceanic forcing of the late 20th century Sahel drought. Geophys. Res. Lett. 32, 1–5.
   Google Scholar
• Lweendo, M., Lu, B., Wang, M., Zhang, H. and Xu, W. 2017. Characterization of droughts in humid subtropical region, Upper Kafue River Basin (Southern Africa). Water 9, 242. doi:10.3390/w9040242
   Google Scholar
• Mahmood, R., Pielke, R. A., Hubbard, K. G., Niyogi, D., Dirmeyer, P. A. and co-authors. 2014. Land cover changes and their biogeophysical effects on climate. Int. J. Climatol. 34, 929–953. doi:10.1002/joc.3736
   Google Scholar
• McLean, J. D., De Freitas, C. R. and Carter, R. M. 2009. Influence of the Southern Oscillation on tropospheric temperature. J. Geophys. Res. Atmos. 114, 1–8.
   Google Scholar
• Michelle, L., Tippett, M. K. and Barnston, A. G. 2015. Characterizing ENSO coupled variability and its impact on North American seasonal precipitation and temperature. J. Climate 28, 4231–4245.
   Google Scholar
• Mitchell, T. D. and Jones, P. D. 2005. An improved method of constructing a database of monthly climate observations and associated high-resolution grids. Int. J. Climatol. 25, 693–712. doi:10.1002/joc.1181
   Google Scholar
• Munro, R. N., Deckers, J., Haile, M., Grove, A. T., Poesen, J. and co-authors. 2008. Soil landscapes, land cover change and erosion features of the Central Plateau region of Tigrai, Ethiopia: photo-monitoring with an interval of 30 years. Catena 75, 55–64. doi:10.1016/j.catena.2008.04.009
   Google Scholar
• Mutai, C. C. and Ward, M. N. 2000. East African rainfall and the tropical circulation/convection on intraseasonal to interannual timescales. J. Climate 13, 3915–3939. doi:10.1175/1520-0442(2000)013<3915:EARATT>2.0.CO;2
   Google Scholar
• Nandkeolyar, N., Raman, M., Kiran, G. S. and Ajai, 2013. Comparative analyses of sea surface temperature pattern in the Eastern and Western Gulfs of Arabian Sea and the Red Sea in recent past using satellite data. Int. J. Oceanog. 2013, 1–16. doi:10.1155/2013/501602
   Google Scholar
• Nega, B., Adenew, B. and Gebre Sellasie, S. 2003. Current land policy issues in Ethiopia. Ethiopian Economic Policy Research Institute - Eldis, pp. 103–124.
   Google Scholar
• Ning, T., Liu, W., Lin, W. and Song, X. 2015. NDVI variation and its responses to climate change on the Northern Loess Plateau of China from 1998 to 2012. Adv. Meteorol. 2015, 1–10. doi:10.1155/2015/725427
   Google Scholar
• Nobre, P. and Srukla, J. 1996. Variations of sea surface temperature, wind stress, and rainfall over the Tropical Atlantic and South America. J. Climate 9, 2464–2479. doi:10.1175/1520-0442(1996)009<2464:VOSSTW>2.0.CO;2
   Google Scholar
• Norton, C. C., Mosher, F. R. and Hinton, B. 2002. An investigation of surface albedo variations during the recent sahel drought. J. Appl. Meteor. 18, 1252–1262.
   Google Scholar
• Nury, A. H. and Hasan, K. 2016. Analyses of drought in northwestern Bangladesh using standardized precipitation index and its relation to southern oscillation index. Environ. Engin. Res. 21, 58–68. doi:10.4491/eer.2015.115
   Google Scholar
• Nyssen, J., Poesen, J., Haile, M., Moeyersons, J., Deckers, J. and co-authors. 2009. Effects of land use and land cover on sheet and rill erosion rates in the Tigray highlands, Ethiopia. Zeit. Fur. Geo. 53, 171–197. doi:10.1127/0372-8854/2009/0053-0171
   Google Scholar
• Pant, G. B. and Parthasarathy, S. B. 1981. Some aspects of an association between the southern oscillation and Indian summer monsoon. Arch. Met. Geoph. Biocl, Ser. B. 29, 245–252. doi:10.1007/BF02263246
   Google Scholar
• Peters, A. J., Walter-Shea, E. A., Ji, L., Viña, A., Hayes, M. J. and co-authors. 2002. Drought monitoring with NDVI-based standardized vegetation index. Photogram. Engin. Rem. Sens. 68, 71–75.
   Google Scholar
• Pielke, R. A., Marland, G., Betts, R. A., Chase, T. N., Eastman, J. L. and co-authors. 2002. The influence of land-use change and landscape dynamics on the climate system: relevance to climate-change policy beyond the radiative effect of greenhouse gases. Phil. Trans. R. Soc. London. Ser. A.: Math. Phys. Engin. Sci. 360, 1705–1719. doi:10.1098/rsta.2002.1027
   Google Scholar
• Raitsos, D. E., Hoteit, I., Prihartato, P. K., Chronis, T., Triantafyllou, G. and co-authors. 2011. Abrupt warming of the Red Sea. Geophys. Res. Lett. 38, n/a–n/a.
   Google Scholar
• Rajagopalan, B., Cook, E., Lall, U. and Ray, B. K. 2000. Spatiotemporal variability of ENSO and SST teleconnections to summer drought over the United States during the twentieth century. J. Climate 13, 4244–4255. doi:10.1175/1520-0442(2000)013<4244:SVOEAS>2.0.CO;2
   Google Scholar
• Rasmussen, K., Fog, B. and Madsen, J. E. 2001. Desertification in reverse? Observations from northern Burkina Faso. Glob. Environ. Change 11, 271–282. doi:10.1016/S0959-3780(01)00005-X
   Google Scholar
• Reynolds, R. W., Rayner, N. A., Smith, T. M., Stokes, D. C., Wang, W. and co-authors. 2002. An improved in situ and satellite SST analyses. J. Climate 15, 1609–1625. doi:10.1175/1520-0442(2002)015<1609:AIISAS>2.0.CO;2
   Google Scholar
• Reynolds, R. W., Smith, T. M., Liu, C., Chelton, D. B., Casey, K. S. and co-authors. 2007. Daily high-resolution-blended analyses for sea surface temperature. J. Climate 20, 5473–5496. doi:10.1175/2007JCLI1824.1
   Google Scholar
• Segele, Z., Leslie, L. and Tarhule, A. 2015. Sensitivity of horn of Africa rainfall to regional sea surface temperature forcing. Climate 3, 365–390. doi:10.3390/cli3020365
   Google Scholar
• Sentian, J. and Kong, S. K. 2015. The effect of land cover changes on surface temperature and precipitation in the Southeast Asia region. Adv. Sci. Lett. 21, 181–184. doi:10.1166/asl.2015.5849
   Google Scholar
• Sertel, E., Ormeci, C. and Robock, A. 2011. Modelling land cover change impact on the summer climate of the Marmara Region, Turkey. IJGW 3, 194–202. doi:10.1504/IJGW.2011.038379
   Google Scholar
• Servain, J. 1991. Simple climatic indices for the tropical Atlantic Ocean and some applications. J. Geophys. Res. 96, 15137–15146. doi:10.1029/91JC01046
   Google Scholar
• Shanko, D. and Camberlin, P. 1998. The effects of the Southwest Indian Ocean tropical cyclones on Ethiopian drought. Int. J. Climatol. 18, 1373–1388. doi:10.1002/(SICI)1097-0088(1998100)18:12<1373::AID-JOC313>3.0.CO;2-K
   Google Scholar
• Singh, R. P., Roy, S. and Kogan, F. 2003. Vegetation and temperature condition indices from NOAA AVHRR data for drought monitoring over India. Int. J. Rem. Sens. 24, 4393–4402. doi:10.1080/0143116031000084323
   Google Scholar
• Soden, B. J., Lau, N.-C. and Klein, S. A. 1999. Remote sea surface temperature variations during ENSO: evidence for a tropical atmospheric bridge. J. Climate 12, 917–932.
   Google Scholar
• Stagge, J. and Tallaksen, L. 2014. Standardized precipitation-evapotranspiration index (SPEI): Sensitivity to potential evapotranspiration model and parameters. In: Proceedings of FRIEND-Water 2014, Montpellier, France, pp. 367–373.
   Google Scholar
• Suppiah, R. 2004. Trends in the southern oscillation phenomenon and Australian rainfall and changes in their relationships. Int. J. Climatol. 24, 269–290. doi:10.1002/joc.1001
   Google Scholar
• Svoboda, M., Hayes, M. and Wood, D. 2012. Standardized Precipitation Index User Guide. World Meteorological Organization, Geneva, Switzerland.
   Google Scholar
• Teka, K., Van Rompaey, A. and Poesen, J. 2013. Assessing the role of policies on land use change and agricultural development since 1960s in northern Ethiopia. Land Use Policy 30, 944–951. doi:10.1016/j.landusepol.2012.07.005
   Google Scholar
• Tesfay, G. 2006. Agriculture, Resources Management and Institutions: a socio-economic analyses of households in Tigray, Ethiopia. PhD Thesis, Wageningen University, Wageningen.
   Google Scholar
• Tilahun, A., Islam, Z., Behaylu, A., Kassa, G. and Abere, M. 2015. Application of GIS and Remote Sensing for Land Use and Land Cover Change in Kilite Awulalo, Tigray Ethiopia. G- J. Environ. Sci. Technol. 2, 60–65.
   Google Scholar
• Trenberth, K. E. 1997. The Definition of El Niño. Bull. Amer. Meteor. Soc. 78, 2771–2777. doi:10.1175/1520-0477(1997)078<2771:TDOENO>2.0.CO;2
   Google Scholar
• Trenberth, K. E. 2019. The Climate Data Guide: Nino SST Indices (Nino 1 + 2, 3, 3.4, 4; ONI and TNI). Online at: https://climatedataguide.ucar.edu/climate-data/nino-sst-indices-nino-12-3-34-4-oni-and-tni
   Google Scholar
• Trenberth, K. E. and Caron, J. M. 2000. The southern oscillation revisited: sea level pressures, surface temperatures, and precipitation. J. Climate 13, 4358–4365. doi:10.1175/1520-0442(2000)013<4358:TSORSL>2.0.CO;2
   Google Scholar
• Ummenhofer, C. C., Sen Gupta, A., England, M. H. and Reason, C. J. C. 2009. Contributions of Indian Ocean Sea surface temperatures to enhanced East African rainfall. J. Climate 22, 993–1013. doi:10.1175/2008JCLI2493.1
   Google Scholar
• Vicente-Serrano, S. M., Beguería, S. and López-Moreno, J. I. 2010. A multiscalar drought index sensitive to global warming: the standardized precipitation evapotranspiration index. J. Climate 23, 1696–1718. doi:10.1175/2009JCLI2909.1
   Google Scholar
• Wan, Z., Wang, P. and Li, X. 2004. Using MODIS Land Surface Temperature and Normalized Difference Vegetation Index products for monitoring drought in the southern Great Plains, USA. Int. J. Rem. Sens. 25, 61–72. doi:10.1080/0143116031000115328
   Google Scholar
• Wang, Y. 2003. Nonparametric tests for randomness. ECE 461, 1–11.
   Google Scholar
• WMO and GCOS. 2015. Status of the global observing system for climate. No. GCOS-195.
   Google Scholar
• Yan, H., Sun, L., Wang, Y., Huang, W., Qiu, S. and co-authors. 2011. A record of the Southern Oscillation Index for the past 2,000 years from precipitation proxies. Nat. Geosci. 4, 611–614. doi:10.1038/ngeo1231
   Google Scholar
• Yuan, X., Li, L., Chen, X. and Shi, H. 2015. Effects of Precipitation Intensity and Temperature on NDVI-Based Grass Change over Northern China during the Period from 1982 to 2011. Rem. Sens 7, 10164–10183. doi:10.3390/rs70810164
   Google Scholar
• Zhang, Y. and Liang, S. 2018. Impacts of land cover transitions on surface temperature in China based on satellite observations. Environ. Res. Lett. 13, 024010. doi:10.1088/1748-9326/aa9e93
   Google Scholar
• Zolina, O., Dufour, A., Gulev, S. K. and S, G. 2017. Regional hydrological cycle over the Red Sea in ERA-Interim. J. Hydrometeor. 18, 65–83.
   Google Scholar