A Review of the Late Pleistocene-Holocene Climatic and Paleoecological Records in Tanzania
AbstractClimate change is poorly addressed in the developing countries particularly in tropical East Africa such as Tanzania. This paper aimed to reconstruct the late Pleistocene to Holocene Tanzanian climate change using proxies from terrestrial and marine environment. Although data are limited, the inferred major events were found to have a link with global events. In late Pleistocene, during the Last Glacial Maximum (LGM), Tanzania experienced aridity as the other areas in the tropics. This was followed by the humid high precipitation period, highly pronounced between 9-6 ka. Proxies indicate that the humid period was interrupted by a brief dry Younger Dryas (YD) around 13.0-11.5 ka and a cool dry event at 8.2 ka. Other remarkable events are the cool event in the mid Holocene at 5.2 ka and the global dry event at 4.0 ka. There is a general decrease in precipitation from 5 ka to present with the aridity being pronounced between 3-2 ka and 1.2-0.5 ka. Despite of relatively low precipitation in Late Holocene, wet conditions are inferred between 1.7-1.2 ka (being interrupted by remarkable episodes of aridity) and the late periods of the 19th and 20th centuries. The 20th century which is marked by increased temperature is likely to cause changes in hydrological circle leading to the increase in heavy rainfall and drought periods. Through this study, it is revealed that works are limited and concentrated in some specific areas within the country which exhibit different climatic condition. As a result, some proxies particularly from Eastern Arc Mountains show contradicting records and, in some places, interpretation is partial due to extrapolation of the proxies which are not widely distributed within a specific climate zone.
W. Dansgaard, S. Johnsen, H. C.- Nature, and undefined 1993, “Evidence for general instability of past climate from a 250-kyr ice-core record,” nature.com.
J. Petit, J. Jouzel, D. Raynaud, N. Barkov, J. B.- Nature, and undefined 1999, “Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica,” nature.com.
M. Trauth, M. Maslin, A. Deino, M. S.- Science, and undefined 2005, “Late cenozoic moisture history of East Africa,” science.sciencemag.org.
I. C.- Agenda and undefined 2007, “Climate change 2007: The physical science basis,” slvwd.com.
J. Jouzel, V. Masson-Delmotte, … O. C.-, and undefined 2007, “Orbital and millennial Antarctic climate variability over the past 800,000 years,” science.sciencemag.org.
M. Tiwari, R. R.-C. Science, and undefined 2007, “Solar variability in the past and palaeoclimate data pertaining to the southwest monsoon,” repository.ias.ac.in.
J. Tierney, J. Russell, Y. Huang, … J. D.-, and undefined 2008, “Northern hemisphere controls on tropical southeast African climate during the past 60,000 years,” science.sciencemag.org.
P. M.-O. geochemistry and undefined 1997, “Organic geochemical proxies of paleoceanographic, paleolimnologic, and paleoclimatic processes,” Elsevier.
I. Ssemmanda and A. Vincens, “Vegetation Changes and Their Climatic Implications for the Lake Victoria Region during the Late Holocene,” 2002, pp. 509–523.
A. Vincens, G. Buchet, D. Williamson, M. T.-R. of P. and, and undefined 2005, “A 23,000 yr pollen record from Lake Rukwa (8 S, SW Tanzania): new data on vegetation dynamics and climate in Central Eastern Africa,” Elsevier.
L. M. Kiage and K. Liu, “Late Quaternary paleoenvironmental changes in East Africa: a review of multiproxy evidence from palynology, lake sediments, and associated records,” Prog. Phys. Geogr., vol. 30, no. 5, pp. 633–658, Oct. 2006.
T. M. Brncic, K. J. Willis, D. J. Harris, M. W. Telfer, and R. M. Bailey, “Fire and climate change impacts on lowland forest composition in northern Congo during the last 2580 years from palaeoecological analyses of a seasonally flooded swamp,” The Holocene, vol. 19, no. 1, pp. 79–89, Jan. 2009.
M. E. Mann, “Climate Over the Past Two Millennia,” Annu. Rev. Earth Planet. Sci., vol. 35, no. 1, pp. 111–136, May 2007.
M. Mann, Z. Zhang, … M. H.-P. of the, and undefined 2008, “Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia,” Natl. Acad Sci.
K. Liu, P. C.-J. of Biogeography, and undefined 1988, “A 5200-year history of Amazon rain forest,” JSTOR.
J. Maley, P. B.-R. of P. and Palynology, and undefined 1998, “Vegetation dynamics, palaeoenvironments and climatic changes in the forests of western Cameroon during the last 28,000 years BP,” Elsevier.
H. Behling, V. Pillar, … L. O.-P., and undefined 2004, “Late Quaternary Araucaria forest, grassland (Campos), fire and climate dynamics, studied by high-resolution pollen, charcoal and multivariate analysis of the Cambará,” Elsevier.
D. B.-Q. Research and undefined 1987, “Late Holocene vegetational change in central Madagascar,” cambridge.org.
D. B.-Q. Research and undefined 1987, “Late Quaternary stratigraphic charcoal records from Madagascar,” cambridge.org.
C. Whitlock and S. H. Millspaugh, “Testing the assumptions of fire-history studies: an examination of modern charcoal accumulation in Yellowstone National Park, USA,” The Holocene, vol. 6, no. 1, pp. 7–15, Mar. 1996.
C. J. Long, C. Whitlock, P. J. Bartlein, and S. H. Millspaugh, “A 9000-year fire history from the Oregon Coast Range, based on a high-resolution charcoal study,” Can. J. For. Res., vol. 28, no. 5, pp. 774–787, May 1998.
D. P.-A. Antiquity and undefined 1989, “Phytolith Analysis: An Archaeological and Geological Perspective. Dolores R. Piperno. Academic Press, San Diego, 1988. xii + 280 pp., plates, appendix, biblio,” cambridge.org.
J. M.-Q. Research and undefined 1991, “Vegetation response to climatic change in Central Rift Valley, Kenya,” cambridge.org.
D. Piperno and D. Pearsall, “The silica bodies of tropical American grasses: morphology, taxonomy, and implications for grass systematics and fossil phytolith identification,” 1998.
F. Gasse, P. Barker, P. Gell, S. Fritz, F. C.-Q. Science, and undefined 1997, “Diatom-inferred salinity in palaeolakes: an indirect tracer of climate change,” Elsevier.
P. Barker, F. Street-Perrott, … M. L.-, and undefined 2001, “A 14,000-year oxygen isotope record from diatom silica in two alpine lakes on Mt. Kenya,” science.sciencemag.org.
J. Ortiz, T. Guilderson, J. Adkins, … M. S.-Q. science, and undefined 2000, “Abrupt onset and termination of the African Humid Period:: rapid climate responses to gradual insolation forcing,” Elsevier.
P. Barker, E. Hurrell, M. Leng, … C. W.-, and undefined 2011, “Seasonality in equatorial climate over the past 25 ky revealed by oxygen isotope records from Mount Kilimanjaro,” pubs.geoscienceworld.org.
A. Cohen, M. Talbot, … S. A.-G., and undefined 1997, “Lake level and paleoenvironmental history of Lake Tanganyika, Africa, as inferred from late Holocene and modern stromatolites,” pubs.geoscienceworld.org.
S. Alin, A. C.- Palaeogeography, undefined Palaeoclimatology, undefined Palaeoecology, and undefined 2003, “Lake-level history of Lake Tanganyika, East Africa, for the past 2500 years based on ostracode-inferred water-depth reconstruction,” Elsevier.
F. G.-Q. S. Reviews and undefined 2000, “Hydrological changes in the African tropics since the Last Glacial Maximum,” Elsevier.
U. Salzmann, “Are modern savannas degraded forests?-A Holocene pollen record from the Sudanian vagetation zone of NE Nigeria,” Veg. Hist. Archaeobot., vol. 9, no. 1, pp. 1–15, Mar. 2000.
O. Peyron, D. Jolly, R. Bonnefille, … A. V.-Q., and undefined 2000, “Climate of East Africa 6000 14C Yr BP as Inferred from Pollen Data,” cambridge.org.
M. Wooller, F. Street-Perrott, A. A.- Palaeogeography, and undefined 2000, “Late Quaternary fires and grassland palaeoecology of Mount Kenya, East Africa: evidence from charred grass cuticles in lake sediments,” Elsevier.
U. Salzmann, P. Hoelzmann, I. M.-Q. Research, and undefined 2002, “Late Quaternary climate and vegetation of the Sudanian zone of northeast Nigeria,” cambridge.org.
H. Lamb, I. Darbyshire, and D. Verschuren, “Vegetation response to rainfall variation and human impact in central Kenya during the past 1100 years,” The Holocene, vol. 13, no. 2, pp. 285–292, Feb. 2003.
I. Darbyshire, H. Lamb, and M. Umer, “Forest clearance and regrowth in northern Ethiopia during the last 3000 years,” The Holocene, vol. 13, no. 4, pp. 537–546, May 2003.
M. Talbot, T. L.-J. of Paleolimnology, and undefined 2000, “The Late Pleistocene-Holocene palaeolimnology of Lake Victoria, East Africa, based upon elemental and isotopic analyses of sedimentary organic matter,” Springer.
K. Lundblad and K. Holmgren, “Palaeoclimatological survey of stalagmites from coastal areas in tanzania,” Geogr. Ann. Ser. A, Phys. Geogr., vol. 87, no. 1, pp. 125–140, Mar. 2005.
A. M.-T. J. of Science and undefined 2006, “Stable isotope compositions of organic carbon and contents of organic carbon and nitrogen of lacustrine sediments from sub-arid northern Tanzania,” ajol.info.
C. Mumbi, R. Marchant, … H. H.-Q., and undefined 2008, “Late Quaternary vegetation reconstruction from the eastern Arc mountains, Tanzania,” cambridge.org.
P. Barker, E. Hurrell, M. Leng, … B. P.-Q. S., and undefined 2013, “Carbon cycling within an East African lake revealed by the carbon isotope composition of diatom silica: a 25-ka record from Lake Challa, Mt. Kilimanjaro,” Elsevier.
S. E. Nicholson, “Fluctuations of Rift Valley Lakes Malawi and Chilwa During Historical Times: A Synthesis of Geological, Archaeological and Historical Information,” 1998, pp. 207–231.
S. E. Nicholson, “Historical Fluctuations of Lake Victoria and Other Lakes in the Northern Rift Valley of East Africa,” 1998, pp. 7–35.
J. Tierney, J. Russell, J. Damsté, … Y. H.-Q. S., and undefined 2011, “Late Quaternary behavior of the East African monsoon and the importance of the Congo Air Boundary,” Elsevier.
D. Verschuren, J. Damsté, J. Moernaut, I. K.- Nature, and undefined 2009, “Half-precessional dynamics of monsoon rainfall near the East African Equator,” nature.com.
C. A. Scholz, T. C. Johnson, P. Cattaneo, H. Malinga, and S. Shana, “Initial Results of 1995 IDEAL Seismic Reflection Survey of Lake Victoria, Uganda and Tanzania,” 1998, pp. 47–57.
M. Abbott, B. Finney, M. E.-Q. Research, and undefined 2000, “Lake-level reconstruction and paleohydrology of Birch Lake, central Alaska, based on seismic reflection profiles and core transects,” cambridge.org.
J. Moernaut, D. Verschuren, F. Charlet, … I. K.-E. and P., and undefined 2010, “The seismic-stratigraphic record of lake-level fluctuations in Lake Challa: Hydrological stability and change in equatorial East Africa over the last 140 kyr,” Elsevier.
A. N. Muzuka and N. Nyandwi, “Lake Tanganyika Holocene Record on Variability in Precipitation in the Malagarasi Catchment Basin,” 2002, pp. 415–428.
J. Casanova, C. H.-M.- Palaeogeography, undefined Palaeoclimatology, and undefined 1992, “Late Holocene hydrological history of Lake Tanganyika, East Africa, from isotopic data on fossil stromatolites,” Elsevier.
A. S. Cohen, K.-E. Lezzar, J.-J. Tiercelin, and M. Soreghan, “New palaeogeographic and lake-level reconstructions of Lake Tanganyika: implications for tectonic, climatic and biological evolution in a rift lake,” Basin Res., vol. 9, no. 2, pp. 107–132, Jun. 1997.
A. Felton, J. Russell, A. Cohen, … M. B.-P., and undefined 2007, “Paleolimnological evidence for the onset and termination of glacial aridity from Lake Tanganyika, Tropical East Africa,” Elsevier.
S. Alin, A. C.- Paleobiology, and undefined 2004, “The live, the dead, and the very dead: taphonomic calibration of the recent record of paleoecological change in Lake Tanganyika, East Africa,” cambridge.org.
A. Cohen, K. Lezzar, J. Cole, … D. D.-J. of, and undefined 2006, “Late Holocene linkages between decade–century scale climate variability and productivity at Lake Tanganyika, Africa,” Springer.
J. Stager, C. Cocquyt, … R. B.-Q., and undefined 2009, “A late holocene paleoclimatic history of Lake Tanganyika, East Africa,” cambridge.org.
P. Barker, M. Leng, F. Gasse, Y. H.-E. and P. Science, and undefined 2007, “Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records,” Elsevier.
G. H. DeBusk, “A 37,500-year pollen record from Lake Malawi and implications for the biogeography of afromontane forests,” J. Biogeogr., vol. 25, no. 3, pp. 479–500, May 1998.
G. D. J.-R. of P. and Palynology and undefined 1997, “The distribution of pollen in the surface sediments of Lake Malawi, Africa, and the transport of pollen in large lakes,” Elsevier.
I. Castañeda, J. Werne, … T. J.-P., and undefined 2011, “Organic geochemical records from Lake Malawi (East Africa) of the last 700 years, part II: Biomarker evidence for recent changes in primary productivity,” Elsevier.
I. Castañeda, J. Werne, … T. J.-P., and undefined 2009, “Late Quaternary vegetation history of southeast Africa: the molecular isotopic record from Lake Malawi,” Elsevier.
P. Branchu, L. Bergonzini, D. Delvaux, … M. D. B.-J. of A. E., and undefined 2005, “Tectonic, climatic and hydrothermal control on sedimentation and water chemistry of northern Lake Malawi (Nyasa), Tanzania,” Elsevier.
R. Lyons, C. Scholz, … M. B.-P., and undefined 2011, “Late Quaternary stratigraphic analysis of the Lake Malawi Rift, East Africa: an integration of drill-core and seismic-reflection data,” Elsevier.
J. Stone, K. Westover, A. C.- Palaeogeography, undefined Palaeoclimatology, and undefined 2011, “Late Pleistocene paleohydrography and diatom paleoecology of the central basin of Lake Malawi, Africa,” Elsevier.
C. Scholz, M. Talbot, E. Brown, R. L.- Palaeogeography, and undefined 2011, “Lithostratigraphy, physical properties and organic matter variability in Lake Malawi drillcore sediments over the past 145,000 years,” Elsevier.
E. B.- Palaeogeography, undefined Palaeoclimatology, undefined Palaeoecology, and undefined 2011, “Lake Malawi’s response to ‘megadrought’ terminations: sedimentary records of flooding, weathering and erosion,” Elsevier.
J. Stager, D. Ryves, B. Cumming, … L. M.-J. of, and undefined 2005, “Solar variability and the levels of Lake Victoria, East Africa, during the last millenium,” Springer.
P. Barker et al., “The sensitivity of a Tanzanian crater lake to catastrophic tephra input and four millennia of climate change,” The Holocene, vol. 10, no. 3, pp. 303–310, Apr. 2000.
P. Barker, F. G.-Q. S. Reviews, and undefined 2003, “New evidence for a reduced water balance in East Africa during the Last Glacial Maximum: implication for model-data comparison,” Elsevier.
F. Thevenon et al., “A late-Holocene charcoal record from Lake Masoko, SW Tanzania: climatic and anthropologic implications,” The Holocene, vol. 13, no. 5, pp. 785–792, Jul. 2003.
A. Vincens, D. Williamson, F. Thevenon, … M. T.-P., and undefined 2003, “Pollen-based vegetation changes in southern Tanzania during the last 4200 years: climate change and/or human impact,” Elsevier.
M. Delalande, L. Bergonzini, and M. Massault, “Mbaka lakes isotopic ( 18 O and 2 H) and water balances: discussion on the used atmospheric moisture compositions,” Isotopes Environ. Health Stud., vol. 44, no. 1, pp. 71–82, Mar. 2008.
Y. Garcin, D. Williamson, M. Taieb, … A. V.-P., and undefined 2006, “Centennial to millennial changes in maar-lake deposition during the last 45,000 years in tropical Southern Africa (Lake Masoko, Tanzania),” Elsevier.
A. Muzuka, M. Ryner, K. H.-J. of A. E. Sciences, and undefined 2004, “12,000-Year, preliminary results of the stable nitrogen and carbon isotope record from the Empakai Crater lake sediments, Northern Tanzania,” Elsevier.
M. Ryner, F. Gasse, B. Rumes, D. V.- Palaeogeography, and undefined 2007, “Climatic and hydrological instability in semi-arid equatorial East Africa during the late Glacial to Holocene transition: a multi-proxy reconstruction of aquatic ecosystem,” Elsevier.
C. Hillaire-Marcel, O. Carro, J. C.-Q. Research, and undefined 1986, “14C and Th/U Dating of Pleistocene and Holocene Stromatolites from East African Paleolakes,” cambridge.org.
N. Grumet, R. Dunbar, and J. Cole, “Multisite record of climate change from Indian Ocean corals,” 2000.
H. Kayanne, H. Iijima, N. Nakamura, T. R. McClanahan, S. Behera, and T. Yamagata, “Indian Ocean Dipole index recorded in Kenyan coral annual density bands,” Geophys. Res. Lett., vol. 33, no. 19, p. L19709, Oct. 2006.
S. Romahn, A. Mackensen, J. G.-C. of the Past, and undefined 2014, “Deglacial intermediate water reorganization: new evidence from the Indian Ocean,” clim-past.net.
H. Kuhnert, H. Kuhlmann, M. Mohtadi, H. Meggers, K.-H. Baumann, and J. Pätzold, “Holocene tropical western Indian Ocean sea surface temperatures in covariation with climatic changes in the Indonesian region,” Paleoceanography, vol. 29, no. 5, pp. 423–437, May 2014.
M. Blaauw, B. van Geel, I. Kristen, … B. P.-Q. S., and undefined 2011, “High-resolution 14C dating of a 25,000-year lake-sediment record from equatorial East Africa,” Elsevier.
H. Öberg, E. Norström, M. Ryner, … K. H.-P., and undefined 2013, “Environmental variability in northern Tanzania from AD 1000 to 1800, as inferred from diatoms and pollen in Lake Duluti,” Elsevier.
P. Barker, R. Telford, F. Gasse, F. T.- Palaeogeography, and undefined 2002, “Late Pleistocene and Holocene palaeohydrology of Lake Rukwa, Tanzania, inferred from diatom analysis,” Elsevier.
L. Thompson, E. Mosley-Thompson, … M. D.-, and undefined 2002, “Kilimanjaro ice core records: evidence of Holocene climate change in tropical Africa,” science.sciencemag.org.
J. Finch, M. Leng, R. M.-Q. Research, and undefined 2009, “Late Quaternary vegetation dynamics in a biodiversity hotspot, the Uluguru Mountains of Tanzania,” cambridge.org.
S. N.-C. Change and undefined 1999, “Historical and modern fluctuations of lakes Tanganyika and Rukwa and their relationship to rainfall variability,” Springer.
D. Conway, “Extreme Rainfall Events and Lake Level Changes in East Africa: Recent Events and Historical Precedents,” 2002, pp. 63–92.
D. Verschuren, … T. J.-… of the R., and undefined 2002, “History and timing of human impact on Lake Victoria, East Africa,” rspb.royalsocietypublishing.org.
J. M.-J. of G. L. Research and undefined 2010, “Stable carbon and nitrogen isotopic signatures of organic matter sources in near-shore areas of Lake Victoria, East Africa,” Elsevier.
J. Stager, B. Cumming, L. M.-Q. research, and undefined 1997, “A high-resolution 11,400-yr diatom record from Lake Victoria, East Africa,” cambridge.org.
P. Barker, R. Telford, O. Merdaci, … D. W.-T., and undefined 2000, “The sensitivity of a Tanzanian crater lake to catastrophic tephra input and four millennia of climate change,” journals.sagepub.com.
T. Lærdal, M. R. Talbot, and J. M. Russell, “Late Quaternary Sedimentation and Climate in the Lakes Edward and George Area, Uganda — Congo,” 2002, pp. 429–470.
A. Burnett, M. Soreghan, … C. S.-P., and undefined 2011, “Tropical East African climate change and its relation to global climate: a record from Lake Tanganyika, Tropical East Africa, over the past 90+ kyr,” Elsevier.
J. FINCH, M. WOOLLER, and R. MARCHANT, “Tracing long-term tropical montane ecosystem change in the Eastern Arc Mountains of Tanzania,” J. Quat. Sci., vol. 29, no. 3, pp. 269–278, Apr. 2014.
R. Crul, “Limnology and hydrology of Lakes Tanganyika and Malawi,” 1997.
L. A. Powers, “Large temperature variability in the southern African tropics since the Last Glacial Maximum,” Geophys. Res. Lett., vol. 32, no. 8, p. L08706, 2005.
C. Scholz, A. Cohen, T. Johnson, … J. K.-P., and undefined 2011, “Scientific drilling in the Great Rift Valley: the 2005 Lake Malawi Scientific Drilling Project—an overview of the past 145,000 years of climate variability in Southern,” Elsevier.
I. Castañeda, J. Werne, T. J.- Geology, and undefined 2007, “Wet and arid phases in the southeast African tropics since the Last Glacial Maximum,” pubs.geoscienceworld.org.
Y. Garcin, A. Vincens, D. Williamson, J. Guiot, and G. Buchet, “Wet phases in tropical southern Africa during the last glacial period,” Geophys. Res. Lett., vol. 33, no. 7, p. L07703, 2006.
P. Barker, D. Williamson, F. Gasse, E. G.-Q. Research, and undefined 2003, “Climatic and volcanic forcing revealed in a 50,000-year diatom record from Lake Massoko, Tanzania,” cambridge.org.
D. M. Nelson, D. Verschuren, M. A. Urban, and F. S. Hu, “Long-term variability and rainfall control of savanna fire regimes in equatorial East Africa,” Glob. Chang. Biol., vol. 18, no. 10, pp. 3160–3170, Oct. 2012.
S. Weldeab, V. Menke, and G. Schmiedl, “The pace of East African monsoon evolution during the Holocene,” Geophys. Res. Lett., vol. 41, no. 5, pp. 1724–1732, Mar. 2014.
P. B. de Menocal, “End of the African Humid Period,” Nat. Geosci., vol. 8, no. 2, pp. 86–87, Feb. 2015.
T. Shanahan, N. McKay, … K. H.-N., and undefined 2015, “The time-transgressive termination of the African Humid Period,” nature.com.
L. Schüler, A. Hemp, and H. Behling, “Relationship between vegetation and modern pollen-rain along an elevational gradient on Kilimanjaro, Tanzania,” The Holocene, vol. 24, no. 6, pp. 702–713, Jun. 2014.
D. Barber, A. Dyke, C. Hillaire-Marcel, A. J.- Nature, and undefined 1999, “Forcing of the cold event of 8,200 years ago by catastrophic drainage of Laurentide lakes,” nature.com.
E. Rohling, H. P.- Nature, and undefined 2005, “Centennial-scale climate cooling with a sudden cold event around 8,200 years ago,” nature.com.
J. Zalasiewicz, M. W.-C. Change, and undefined 2009, “A geological history of climate change,” Elsevier.
L. Thompson, E. Mosley-Thompson, … M. D.-A. of, and undefined 2011, “A paleoclimatic perspective on the 21st-century glacier loss on Kilimanjaro, Tanzania,” cambridge.org.
S. Alin, A. C.- Palaeogeography, undefined Palaeoclimatology, undefined Palaeoecology, and undefined 2003, “Lake-level history of Lake Tanganyika, East Africa, for the past 2500 years based on ostracode-inferred water-depth reconstruction,” Elsevier.
T. Johnson, S. Barry, Y. Chan, P. W.- Geology, and undefined 2001, “Decadal record of climate variability spanning the past 700 yr in the Southern Tropics of East Africa,” pubs.geoscienceworld.org.
S. Nicholson, X. Y.-C. Change, and undefined 2001, “Rainfall conditions in equatorial East Africa during the nineteenth century as inferred from the record of Lake Victoria,” Springer.
J. Zinke, M. Pfeiffer, O. Timm, W.-C. Dullo, and G. J. A. Brummer, “Western Indian Ocean marine and terrestrial records of climate variability: a review and new concepts on land–ocean interactions since AD 1660,” Int. J. Earth Sci., vol. 98, no. 1, pp. 115–133, Feb. 2009.
J. C. Stager, D. Ryves, B. F. Cumming, L. D. Meeker, and J. Beer, “Solar variability and the levels of Lake Victoria, East Africa, during the last millenium,” J. Paleolimnol., vol. 33, no. 2, pp. 243–251, Feb. 2005.
J. Cole, R. Dunbar, T. M.- Science, and undefined 2000, “Tropical Pacific forcing of decadal SST variability in the western Indian Ocean over the past two centuries,” science.sciencemag.org.
C. Moy, G. Seltzer, D. Rodbell, D. A.- Nature, and undefined 2002, “Variability of El Niño/Southern Oscillation activity at millennial timescales during the Holocene epoch,” nature.com.
R. Kovats, M. Bouma, and A. Haines, “El Niño and Health (WHO/SDE/PHE/99.4. Task Force on Climate and Health.”
J. Huho, R. K.-I. J. of E. Science, and undefined 2014, “Understanding extreme climatic events for economic development in Kenya,” researchgate.net.
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