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Millennial-scale hydroclimate control of tropical soil carbon storage 期刊论文
NATURE, 2020, 581 (7806) : 63-+
作者:  Lam, Tommy Tsan-Yuk;  Jia, Na;  Zhang, Ya-Wei;  Shum, Marcus Ho-Hin;  Jiang, Jia-Fu;  Zhu, Hua-Chen;  Tong, Yi-Gang;  Shi, Yong-Xia;  Ni, Xue-Bing;  Liao, Yun-Shi;  Li, Wen-Juan;  Jiang, Bao-Gui;  Wei, Wei;  Yuan, Ting-Ting;  Zheng, Kui;  Cui, Xiao-Ming;  Li, Jie;  Pei, Guang-Qian
收藏  |  浏览/下载:25/0  |  提交时间:2020/05/13

Over the past 18,000 years, the residence time and amount of soil carbon stored in the Ganges-Brahmaputra basin have been controlled by the intensity of Indian Summer Monsoon rainfall, with greater carbon destabilization during wetter, warmer conditions.


The storage of organic carbon in the terrestrial biosphere directly affects atmospheric concentrations of carbon dioxide over a wide range of timescales. Within the terrestrial biosphere, the magnitude of carbon storage can vary in response to environmental perturbations such as changing temperature or hydroclimate(1), potentially generating feedback on the atmospheric inventory of carbon dioxide. Although temperature controls the storage of soil organic carbon at mid and high latitudes(2,3), hydroclimate may be the dominant driver of soil carbon persistence in the tropics(4,5)  however, the sensitivity of tropical soil carbon turnover to large-scale hydroclimate variability remains poorly understood. Here we show that changes in Indian Summer Monsoon rainfall have controlled the residence time of soil carbon in the Ganges-Brahmaputra basin over the past 18,000 years. Comparison of radiocarbon ages of bulk organic carbon and terrestrial higher-plant biomarkers with co-located palaeohydrological records(6) reveals a negative relationship between monsoon rainfall and soil organic carbon stocks on a millennial timescale. Across the deglaciation period, a depletion of basin-wide soil carbon stocks was triggered by increasing rainfall and associated enhanced soil respiration rates. Our results suggest that future hydroclimate changes in tropical regions are likely to accelerate soil carbon destabilization, further increasing atmospheric carbon dioxide concentrations.


  
Sediment routing from shelf to basin floor in the Quaternary Golo System of Eastern Corsica, France, western Mediterranean Sea 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (5-6) : 1217-1234
作者:  Sweet, Michael L.;  Gaillot, Gwladys T.;  Jouet, Gwenael;  Rittenour, Tammy M.;  Toucanne, Samuel;  Marsset, Tania;  Blum, Michael D.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Oceanic forcing of penultimate deglacial and last interglacial sea-level rise 期刊论文
NATURE, 2020, 577 (7792) : 660-+
作者:  Rizal, Yan;  Westaway, Kira E.;  Zaim, Yahdi;  van den Bergh, Gerrit D.;  Bettis, E. Arthur, III;  Morwood, Michael J.;  Huffman, O. Frank;  Grun, Rainer;  Joannes-Boyau, Renaud;  Bailey, Richard M.;  Sidarto;  Westaway, Michael C.;  Kurniawan, Iwan;  Moore, Mark W.;  Storey, Michael;  Aziz, Fachroel;  Suminto;  Zhao, Jian-xin;  Aswan;  Sipola, Maija E.;  Larick, Roy;  Zonneveld, John-Paul;  Scott, Robert;  Putt, Shelby;  Ciochon, Russell L.
收藏  |  浏览/下载:21/0  |  提交时间:2020/05/13

Sea-level histories during the two most recent deglacial-interglacial intervals show substantial differences(1-3) despite both periods undergoing similar changes in global mean temperature(4,5) and forcing from greenhouse gases(6). Although the last interglaciation (LIG) experienced stronger boreal summer insolation forcing than the present interglaciation(7), understanding why LIG global mean sea level may have been six to nine metres higher than today has proven particularly challenging(2). Extensive areas of polar ice sheets were grounded below sea level during both glacial and interglacial periods, with grounding lines and fringing ice shelves extending onto continental shelves(8). This suggests that oceanic forcing by subsurface warming may also have contributed to ice-sheet loss(9-12) analogous to ongoing changes in the Antarctic(13,14) and Greenland(15) ice sheets. Such forcing would have been especially effective during glacial periods, when the Atlantic Meridional Overturning Circulation (AMOC) experienced large variations on millennial timescales(16), with a reduction of the AMOC causing subsurface warming throughout much of the Atlantic basin(9,12,17). Here we show that greater subsurface warming induced by the longer period of reduced AMOC during the penultimate deglaciation can explain the more-rapid sea-level rise compared with the last deglaciation. This greater forcing also contributed to excess loss from the Greenland and Antarctic ice sheets during the LIG, causing global mean sea level to rise at least four metres above modern levels. When accounting for the combined influences of penultimate and LIG deglaciation on glacial isostatic adjustment, this excess loss of polar ice during the LIG can explain much of the relative sea level recorded by fossil coral reefs and speleothems at intermediate- and far-field sites.


  
Global ocean heat content in the Last Interglacial 期刊论文
NATURE GEOSCIENCE, 2020, 13 (1)
作者:  Shackleton, S.;  Baggenstos, D.;  Menking, J. A.;  Dyonisius, M. N.;  Bereiter, B.;  Bauska, T. K.;  Rhodes, R. H.;  Brook, E. J.;  Petrenko, V. V.;  McConnell, J. R.;  Kellerhals, T.;  Haberli, M.;  Schmitt, J.;  Fischer, H.;  Severinghaus, J. P.
收藏  |  浏览/下载:5/0  |  提交时间:2020/05/13
Multiproxy lacustrine records of post-glacial environmental change from the Uinta Mountains, Utah, USA 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (1-2) : 48-64
作者:  Munroe, Jeffrey S.;  Laabs, Benjamin J. C.
收藏  |  浏览/下载:4/0  |  提交时间:2020/07/02