A 25,000-Year Tropical Climate History from Bolivian Ice Cores

Thompson, Lonnie G.; Davis, M. E.; Mosley‐Thompson, Ellen; Sowers, Todd; Henderson, Keith; Zagorodnov, V.; Lin, Ping-Nan; Mikhalenko, Vladimir; Campen, R. Kramer; Bolzan, John F.; Cole‐Dai, Jihong; Francou, Bernard

doi:10.1126/science.282.5395.1858

Cited by 731 publications

(506 citation statements)

References 37 publications

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“…[40] These results presented here have a bearing on the interpretation of the stable isotope ratios in tropical ice cores [e.g., Thompson et al, 1995Thompson et al, , 1998]. Interpretations of changes in stable isotope ratios of ice cores have assumed that the oceanic source vapors were in near isotopic equilibrium with the sea surface .…”

Section: Discussionmentioning

confidence: 99%

Stable isotopic composition of water vapor in the tropics

et al. 2004

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Section: Discussionmentioning

confidence: 99%

Stable isotopic composition of water vapor in the tropics

et al. 2004

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“…However, as the ice records (e.g. Dansgaard et al, 1993;Thompson et al, 1998) and ocean records (e.g. Bond et al, 1993;Friedrich et al, 2001) have demonstrated, Pleistocene temperatures were far from constant.…”

Section: Discussionmentioning

confidence: 99%

Amazonian paleoecological histories: one hill, three watersheds

Bush

Oliveira

Colinvaux

et al. 2004

Palaeogeography, Palaeoclimatology, Palaeoecology

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Data from the Hill of Six Lakes, in the northwestern Brazilian Amazon region, provide three records of paleoclimatic and vegetation change in lowland Amazonia that span the last 170,000 years. Three lakes, Verde, Pata and Dragäo, which occupy separate watersheds on the hill, provide the most detailed image yet obtained of ice-age conditions in lowland Amazonia. Welldated sedimentary records for fossil palynological, charcoal, cation, and pigment, data are presented.The data indicate the continuous presence of mesic forest throughout the last ice age. Oscillations of lake level are recorded and the lowstands are attributed to reduced precipitation inputs to systems delicately balanced between water loss (leakage through the floor of the basin) and gain (precipitation). Gross stratigraphy, algal remains, and paleochemistry suggest that the stands of high and low lake level were cyclic, apparently correlating precessional orbital variation. Times of lake lowstand coincide with wet season (December-January-February, DJF) insolation minima. The strongest of eight lowstand cycles occurred ca. 35,000 to 27,000 cal BP.Even during lowstand episodes, pollen is well preserved and provides a clear signal of uninterrupted forest cover. The principal lowland elements are continuously present in the record, suggesting the long-term (Quaternary) availability of the lowland forest biome in this region. However, during the late Pleistocene the forest changed in composition with the expansion or invasion of montane floral elements creating communities of the mesic forest biome without modem analogs. While precipitation cycles were causing lake levels to rise and fall, the principal influence on vegetation appears to have been cooling. In the late Pleistocene, the population expansion of montane elements at lower elevations is consistent with a cooling of 4-5 °C.

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“…For several regions of the globe, including the tropics, it is now clear that the transition to modern climate following the last glacial maximum was punctuated by a number of rapid and substantial climatic oscillations (Alley et al, 1993;Gasse and Vancampo, 1994;Thompson et al, 1998). In contrast, relatively little is known about how the tropical ocean responded to the deglaciation because few high resolution records are available from these regions (Hughen et al, 1996).…”

Section: Post-glacial Tropical Sstsmentioning

confidence: 99%

New views of tropical paleoclimates from corals

Gagan

Ayliffe

Beck

et al. 2000

Quaternary Science Reviews

453

287

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Corals o!er a rich archive of past climate variability in tropical ocean regions where instrumental data are limited and where our knowledge of multi-decadal climate sensitivity is incomplete. In the eastern equatorial Paci"c, coral isotopic records track variations in ENSO-related changes in sea-surface temperature; further west, corals record variability in sea-surface temperature and rainfall that accompanies zonal displacement of the Indonesian Low during ENSO events. These multi-century records reveal previously unrecognised ENSO variability on time scales of decades to centuries. Outside the ENSO-sensitive equatorial Paci"c, long-term trends towards recent warmer/wetter conditions suggest the tropics respond to global forcings. New coral paleothermometers indicate that surface-ocean temperatures in the tropical southwestern Paci"c were depressed by 4}63C during the Younger Dryas climatic event and rose episodically during the next 4000 yr. High temporal-resolution measurements of Sr/Ca and O in corals provide information about the surface-ocean hydrologic balance and can resolve the seasonal balance between precipitation and evaporation. Radiocarbon measurements in corals, coupled with ocean circulation models, may be used to reconstruct near-surface ocean circulation, past mixing rates, and the distribution of fossil fuel CO in the upper ocean. Most recently, seasonal to interannual variations in the radiocarbon of corals from the equatorial Paci"c have been linked to the redistribution of surface waters associated with the ENSO.

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A 25,000-Year Tropical Climate History from Bolivian Ice Cores

Cited by 731 publications

References 37 publications

Stable isotopic composition of water vapor in the tropics

Stable isotopic composition of water vapor in the tropics

Amazonian paleoecological histories: one hill, three watersheds

New views of tropical paleoclimates from corals

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