Zobrazeno 1 - 10
of 254
pro vyhledávání: '"C. H. Lear"'
Publikováno v:
Biogeosciences, Vol 21, Pp 1213-1233 (2024)
Electron backscatter diffraction (EBSD) analysis enables a unique perspective of the internal microstructure of foraminiferal calcite. Specifically, EBSD provides crystallographic data from within the test, highlighting the highly organised “mesocr
Externí odkaz:
https://doaj.org/article/0f9df6242a824c6e9d667929dd9c6306
Autor:
N. Wunderling, A. S. von der Heydt, Y. Aksenov, S. Barker, R. Bastiaansen, V. Brovkin, M. Brunetti, V. Couplet, T. Kleinen, C. H. Lear, J. Lohmann, R. M. Roman-Cuesta, S. Sinet, D. Swingedouw, R. Winkelmann, P. Anand, J. Barichivich, S. Bathiany, M. Baudena, J. T. Bruun, C. M. Chiessi, H. K. Coxall, D. Docquier, J. F. Donges, S. K. J. Falkena, A. K. Klose, D. Obura, J. Rocha, S. Rynders, N. J. Steinert, M. Willeit
Publikováno v:
Earth System Dynamics, Vol 15, Pp 41-74 (2024)
Climate tipping elements are large-scale subsystems of the Earth that may transgress critical thresholds (tipping points) under ongoing global warming, with substantial impacts on the biosphere and human societies. Frequently studied examples of such
Externí odkaz:
https://doaj.org/article/2177790fd48f48adb242aee001aaa060
Publikováno v:
Journal of Micropalaeontology, Vol 41, Pp 107-127 (2022)
Muricate planktonic foraminifera comprise an extinct clade that was diverse and abundant in the Paleogene oceans and are widely used in palaeoclimate research as geochemical proxy carriers for the upper oceans. Their characteristic wall texture has s
Externí odkaz:
https://doaj.org/article/ea4e7458e66449fcb4868bb4caf82150
Autor:
D. J. Lunt, F. Bragg, W.-L. Chan, D. K. Hutchinson, J.-B. Ladant, P. Morozova, I. Niezgodzki, S. Steinig, Z. Zhang, J. Zhu, A. Abe-Ouchi, E. Anagnostou, A. M. de Boer, H. K. Coxall, Y. Donnadieu, G. Foster, G. N. Inglis, G. Knorr, P. M. Langebroek, C. H. Lear, G. Lohmann, C. J. Poulsen, P. Sepulchre, J. E. Tierney, P. J. Valdes, E. M. Volodin, T. Dunkley Jones, C. J. Hollis, M. Huber, B. L. Otto-Bliesner
Publikováno v:
Climate of the Past, Vol 17, Pp 203-227 (2021)
We present results from an ensemble of eight climate models, each of which has carried out simulations of the early Eocene climate optimum (EECO, ∼ 50 million years ago). These simulations have been carried out in the framework of the Deep-Time Mod
Externí odkaz:
https://doaj.org/article/7b6841f438e54b4f9d2617c7b44cdd2b
Autor:
D. K. Hutchinson, H. K. Coxall, D. J. Lunt, M. Steinthorsdottir, A. M. de Boer, M. Baatsen, A. von der Heydt, M. Huber, A. T. Kennedy-Asser, L. Kunzmann, J.-B. Ladant, C. H. Lear, K. Moraweck, P. N. Pearson, E. Piga, M. J. Pound, U. Salzmann, H. D. Scher, W. P. Sijp, K. K. Śliwińska, P. A. Wilson, Z. Zhang
Publikováno v:
Climate of the Past, Vol 17, Pp 269-315 (2021)
The Eocene–Oligocene transition (EOT) was a climate shift from a largely ice-free greenhouse world to an icehouse climate, involving the first major glaciation of Antarctica and global cooling occurring ∼34 million years ago (Ma) and lasting ∼7
Externí odkaz:
https://doaj.org/article/7b4ca81a6eb84d0a8275a4fd2dba06c9
Autor:
K. M. Edgar, S. M. Bohaty, H. K. Coxall, P. R. Bown, S. J. Batenburg, C. H. Lear, P. N. Pearson
Publikováno v:
Journal of Micropalaeontology, Vol 39, Pp 117-138 (2020)
The Middle Eocene Climatic Optimum (MECO) at ca. 40 Ma is one of the largest of the transient Eocene global warming events. However, it is relatively poorly known from tropical settings since few sites span the entirety of the MECO event and/or hos
Externí odkaz:
https://doaj.org/article/b929c6a493784df581e1030837149426
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-11 (2020)
In this study, the authors use planktic foraminiferal data to reconstruct ocean carbonate chemistry and temperature from 16.5 to 11 Ma from a size in the tropical eastern Indian Ocean to look at the causes of the Monterey Excursion (ME). They find a
Externí odkaz:
https://doaj.org/article/684b2b4c502749d680eb8805e70e12ea
Publikováno v:
Climate of the Past, Vol 16, Pp 65-78 (2020)
Paleoclimatic and paleoenvironmental reconstructions are fundamentally uncertain because no proxy is a direct record of a single environmental variable of interest; all proxies are indirect and sensitive to multiple forcing factors. One productive ap
Externí odkaz:
https://doaj.org/article/f301078f4bc14980b6c4f74746c75c35
Autor:
C. J. Hollis, T. Dunkley Jones, E. Anagnostou, P. K. Bijl, M. J. Cramwinckel, Y. Cui, G. R. Dickens, K. M. Edgar, Y. Eley, D. Evans, G. L. Foster, J. Frieling, G. N. Inglis, E. M. Kennedy, R. Kozdon, V. Lauretano, C. H. Lear, K. Littler, L. Lourens, A. N. Meckler, B. D. A. Naafs, H. Pälike, R. D. Pancost, P. N. Pearson, U. Röhl, D. L. Royer, U. Salzmann, B. A. Schubert, H. Seebeck, A. Sluijs, R. P. Speijer, P. Stassen, J. Tierney, A. Tripati, B. Wade, T. Westerhold, C. Witkowski, J. C. Zachos, Y. G. Zhang, M. Huber, D. J. Lunt
Publikováno v:
Geoscientific Model Development, Vol 12, Pp 3149-3206 (2019)
The early Eocene (56 to 48 million years ago) is inferred to have been the most recent time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean temperatures were also substantially warmer than those of the present day. As suc
Externí odkaz:
https://doaj.org/article/2c9cbda7c2704c4da455998fb6fc0496
Autor:
H. Detlef, S. T. Belt, S. M. Sosdian, L. Smik, C. H. Lear, I. R. Hall, P. Cabedo-Sanz, K. Husum, S. Kender
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-11 (2018)
Modelling studies propose sea ice to be one of the underlying mechanisms for the Mid-Pleistocene transition. Here, the authors show Mid-Pleistocene subarctic North Pacific sea ice dynamics based on biomarkers and biogenic opal accumulation rates, sup
Externí odkaz:
https://doaj.org/article/2dbe8013d3a1495a81a89ceea3f47533