Century-Long Warming Trends in the Upper Water Column of Lake Tanganyika

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dc.contributor.authorKraemer, Benjamin M.
dc.contributor.authorHook, Simon J.
dc.contributor.authorHuttula, Timo H.
dc.contributor.authorKotilainen, Pekka
dc.contributor.authorO’Reilly, Catherine M.
dc.contributor.authorPeltonen, Anu
dc.contributor.authorPlisnier, Pierre D.
dc.contributor.authorSarvala, Jouko
dc.contributor.authorTamatamah, Rashid A.
dc.contributor.authorVadeboncoeur, Yvonne
dc.contributor.authorWehrli, Bernhard
dc.contributor.authorMcIntyre, Peter B.
dc.date.accessioned2016-07-08T12:34:36Z
dc.date.available2016-07-08T12:34:36Z
dc.date.issued2015
dc.description.abstractLake Tanganyika, the deepest and most voluminous lake in Africa, has warmed over the last century in response to climate change. Separate analyses of surface warming rates estimated from in situ instruments, satellites, and a paleolimnological temperature proxy (TEX86) disagree, leaving uncertainty about the thermal sensitivity of Lake Tanganyika to climate change. Here, we use a comprehensive database of in situ temperature data from the top 100 meters of the water column that span the lake’s seasonal range and lateral extent to demonstrate that long-term temperature trends in Lake Tanganyika depend strongly on depth, season, and latitude. The observed spatiotemporal variation in surface warming rates accounts for small differences between warming rate estimates from in situ instruments and satellite data. However, after accounting for spatiotemporal variation in temperature and warming rates, the TEX86 paleolimnological proxy yields lower surface temperatures (1.46 °C lower on average) and faster warming rates (by a factor of three) than in situ measurements. Based on the ecology of Thaumarchaeota (the microbes whose biomolecules are involved with generating the TEX86 proxy), we offer a reinterpretation of the TEX86 data from Lake Tanganyika as the temperature of the low-oxygen zone, rather than of the lake surface temperature as has been suggested previously. Our analyses provide a thorough accounting of spatiotemporal variation in warming rates, offering strong evidence that thermal and ecological shifts observed in this massive tropical lake over the last century are robust and in step with global climate change.en_US
dc.identifier.citationKraemer, B.M., Hook, S., Huttula, T., Kotilainen, P., O’Reilly, C.M., Peltonen, A., Plisnier, P.D., Sarvala, J., Tamatamah, R., Vadeboncoeur, Y. and Wehrli, B., 2015. Century-long warming trends in the upper water column of Lake Tanganyika. PloS one, 10(7), p.e0132490.en_US
dc.identifier.doi10.1371/journal.pone.0132490
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2961
dc.language.isoenen_US
dc.titleCentury-Long Warming Trends in the Upper Water Column of Lake Tanganyikaen_US
dc.typeJournal Article, Peer Revieweden_US
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