Carbon Sequestration and Sediment Accretion in San Francisco Bay Tidal Wetlands     

John C. Callaway  Evyan L. Borgnis  R. Eugene Turner  Charles S. Milan 《Estuaries and Coasts》2012,35(5):1163-1181

Tidal wetlands play an important role with respect to climate change because of both their sensitivity to sea-level rise and their ability to sequester carbon dioxide from the atmosphere. Policy-based interest in carbon sequestration has increased recently, and wetland restoration projects have potential for carbon credits through soil carbon sequestration. We measured sediment accretion, mineral and organic matter accumulation, and carbon sequestration rates using ¹³⁷Cs and ²¹⁰Pb downcore distributions at six natural tidal wetlands in the San Francisco Bay Estuary. The accretion rates were, in general, 0.2?C0.5?cm?year^?1, indicating that local wetlands are keeping pace with recent rates of sea-level rise. Mineral accumulation rates were higher in salt marshes and at low-marsh stations within individual sites. The average carbon sequestration rate based on ²¹⁰Pb dating was 79?g?C?m^?2?year^?1, with slightly higher rates based on ¹³⁷Cs dating. There was little difference in the sequestration rates among sites or across stations within sites, indicating that a single carbon sequestration rate could be used for crediting tidal wetland restoration projects within the Estuary.  相似文献   

The Siberian Craton and its evolution in terms of the Rodinia hypothesis     

Dmitry Gladkochub Sergei Pisarevsky Tatiana Donskaya Lev Natapov Anatoliy Mazukabzov Arkadiy Stanevich Eugene Sklyarov 《《幕》》2006,29(3):169-174

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Use of archaeology to date liquefaction features and seismic events in the New Madrid seismic zone,Central United States     

Martitia P. Tuttle  Robert H. Lafferty  Margaret J. Guccione  Eugene S. Schweig  Neal Lopinot  Robert F. Cande  Kathleen Dyer-Williams  Marion Haynes 《Geoarchaeology》1996,11(6):451-480

Prehistoric earthquake-induced liquefaction features occur in association with Native American occupation horizons in the New Madrid seismic zone. Age control of these liquefaction features, including sand-blow deposits, sand-blow craters, and sand dikes, can be accomplished by extensive sampling and flotation processing of datable materials as well as archaeobotanical analysis of associated archaeological horizons and pits. This approach increases both the amount of carbon for radiocarbon dating and the precision dating of artifact assemblages. Using this approach, we dated liquefaction features at four sites northwest of Blytheville, Arkansas, and found that at least one significant earthquake occurred in the New Madrid seismic zone between A.D. 1180 and 1400, probably about A.D. 1300 ± 100 yr. In addition, we found three buried sand blows that formed between 3340 B.C. and A.D. 780. In this region where very large to great earthquakes appear to be closely timed, archaeology is helping to develop a paleoearthquake chronology for the New Madrid seismic zone. © 1996 John Wiley & Sons, Inc.  相似文献