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Monumental architecture at Aguada Fenix and the rise of Maya civilization 期刊论文
NATURE, 2020
作者:  Bedding, Timothy R.;  Murphy, Simon J.;  Hey, Daniel R.;  Huber, Daniel;  Li, Tanda;  Smalley, Barry;  Stello, Dennis;  White, Timothy R.;  Ball, Warrick H.;  Chaplin, William J.;  Colman, Isabel L.;  Fuller, Jim;  Gaidos, Eric;  Harbeck, Daniel R.;  Hermes, J. J.;  Holdsworth, Daniel L.;  Li, Gang;  Li, Yaguang;  Mann, Andrew W.;  Reese, Daniel R.;  Sekaran, Sanjay;  Yu, Jie;  Antoci, Victoria;  Bergmann, Christoph;  Brown, Timothy M.;  Howard, Andrew W.;  Ireland, Michael J.;  Isaacson, Howard;  Jenkins, Jon M.;  Kjeldsen, Hans;  McCully, Curtis;  Rabus, Markus;  Rains, Adam D.;  Ricker, George R.;  Tinney, Christopher G.;  Vanderspek, Roland K.
收藏  |  浏览/下载:30/0  |  提交时间:2020/07/03

Archaeologists have traditionally thought that the development of Maya civilization was gradual, assuming that small villages began to emerge during the Middle Preclassic period (1000-350 bc  dates are calibrated throughout) along with the use of ceramics and the adoption of sedentism(1). Recent finds of early ceremonial complexes are beginning to challenge this model. Here we describe an airborne lidar survey and excavations of the previously unknown site of Aguada Fenix (Tabasco, Mexico) with an artificial plateau, which measures 1,400 m in length and 10 to 15 m in height and has 9 causeways radiating out from it. We dated this construction to between 1000 and 800 bc using a Bayesian analysis of radiocarbon dates. To our knowledge, this is the oldest monumental construction ever found in the Maya area and the largest in the entire pre-Hispanic history of the region. Although the site exhibits some similarities to the earlier Olmec centre of San Lorenzo, the community of Aguada Fenix probably did not have marked social inequality comparable to that of San Lorenzo. Aguada Fenix and other ceremonial complexes of the same period suggest the importance of communal work in the initial development of Maya civilization.


Lidar survey of the Maya lowlands uncovers the monumental site of Aguada Fenix, which dates to around 1000-800 bc and points to the role of communal construction in the development of Maya civilization.


  
Unprecedented Atmospheric Ammonia Concentrations Detected in the High Arctic From the 2017 Canadian Wildfires 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2019, 124 (14) : 8178-8202
作者:  Lutsch, Erik;  Strong, Kimberly;  Jones, Dylan B. A.;  Ortega, Ivan;  Hannigan, James W.;  Dammers, Enrico;  Shephard, Mark W.;  Morris, Eleanor;  Murphy, Killian;  Evans, Mathew J.;  Parrington, Mark;  Whitburn, Simon;  Van Damme, Martin;  Clarisse, Lieven;  Coheur, Pierre-Francois;  Clerbaux, Cathy;  Crofts, Betty;  Martin, Randall, V;  Pierce, Jeffrey R.;  Fisher, Jenny A.
收藏  |  浏览/下载:10/0  |  提交时间:2019/11/27
ammonia  Arctic  FTIR  NDACC  PEARL  wildfires  
Large-Amplitude Mountain Waves in the Mesosphere Accompanying Weak Cross-Mountain Flow During DEEPWAVE Research Flight RF22 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2018, 123 (18) : 9992-10022
作者:  Fritts, David C.;  Vosper, Simon B.;  Williams, Bifford P.;  Bossert, Katrina;  Plane, John M. C.;  Taylor, Michael J.;  Pautet, P. -Dominique;  Eckermann, Stephen D.;  Kruse, Christopher G.;  Smith, Ronald B.;  Doernbrack, Andreas;  Rapp, Markus;  Mixa, Tyler;  Reid, Iain M.;  Murphy, Damian J.
收藏  |  浏览/下载:5/0  |  提交时间:2019/04/09
mountain waves  deep gravity wave propagation  gravity wave breaking  mountain wave momentum fluxes