Download or read book Reconstruction of the Recent Paleoenvironment of Pamlico Sound North Carolina Using Foraminifera Stable Isotopes delta 13C delta 15N and Radionuclide Data written by Irene Johanna Abbene and published by . This book was released on 2004 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Paleoenvironmental Change in Pamlico Sound North Carolina written by Candace A. Grand Pre and published by . This book was released on 2006 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reconstructing the Paleoenvironment of the Great Salt Pond on Block Island Rhode Island written by Alana Bartolai and published by . This book was released on 2009 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two sediment cores were collected from the Great Salt Pond on Block Island, Rhode Island, and reflect climatic and geomorphic changes over the past ~1750 years. Radiocarbon dating and mercury analysis provides a basal age of 1740 years BP on GSP3 and mercury analysis dates GSP2 back to ~130 years BP. Sand layers in GSP3 likely represents storm deposits indicating instantaneous deposits, however, these sand layers remain in our age model since they could not be correlated to GSP2. These two cores allow paleoclimatic data from stable isotopes to be compared to global climate changes as well as local signal of environmental impacts on the Great Salt Pond. Shifts in oxygen isotope ratios in core GSP3 are contemporaneous with the Little Ice Age and Medieval Warm Period that occur 150-550 years BP and 1100-700 years BP respectively. [delta]18O values during these time periods reach their largest values, of 1.35%, and their lowest values of -.11% indicating a cooler overall climate. [delta]18O values in core GSP2 reflect precipitation events on a local time scale, which reflect salinity changes in the pond. Salinity oscillations were found to correlate with historical and archeological evidence for the opening of the oceanic breach from the Great Salt Pond to the Atlantic Ocean. [delta]13C values in both cores show a decrease towards the present indicating a decrease in the ponds productivity. Declined percent oxygen saturation levels derived from anthropogenic eutrophication, with declined percent oxygen saturation levels derived [delta]13C values show a similar decrease towards the present, indicating possible anthropogenic eutrophication. The declines in percent oxygen saturation occur in the past 100 years and the more recent 40 years, reaching values as low as 40% saturation. This time period correlates with tourism booms on Block Island. The paleoenvironment of the Great Salt Pond has been impacted by local climatic events such as precipitation as well as the effect of human settlements on the island.
Download or read book A Seismic Stratigraphic Synthesis of the Quaternary Geologic Framework of the Pamlico Sound North Carolina written by Michael David Buckner and published by . This book was released on 2006 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Pliocene Ross Sea Paleoclimate and a New Application of the Diatom Oxygen Isotope Proxy written by Hal W. Hackett and published by . This book was released on 2016 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxygen isotope measurements ([delta]18O) provide valuable insight into climate conditions. These data are advantageous as paleoclimate proxies, but records are sparse in high latitude waters, where calcareous microfossils are poorly preserved in marine sediments. Over glacial timescales, high latitude regions likely have the widest variability in terms of the [delta]18O values of marine waters; therefore, the paucity of data in these regions greatly hinders our ability to reconstruct global climatic and environmental change. This research is motivated to investigate Southern Ocean diatoms as a way to begin filling the gap in our knowledge. Diatoms are a cosmopolitan group of siliceous phytoplankton with characteristic ecological affinities. Diatom silica is increasingly being analyzed as a [delta]18O archive, and has the potential to provide comparable data to [delta]18O variations recorded by benthic foraminifera, but to date, studies have focused on Holocene sediments. This thesis presents oxygen isotope values from Early Pliocene Ross Sea diatoms, assessment of purification procedures, and implications for paleoclimate and the history of the West Antarctic Ice Sheet. ANDRILL AND-1B is a 13 Ma record from the Antarctic Geologic Drilling Project in the Ross Sea, which provides Lower to Mid Pliocene diatomite units. The context provided by age models and paleoenvironmental studies, along with more geologically recent Southern Ocean diatom [delta]18O measurements, make AND-1B an ideal dataset for further exploring the use of diatom [delta]18O values as a record of changes in salinity and temperature in high latitude seawater. Samples were purified; geochemically and mineralogically assessed using x-ray diffraction (e.g. identification of amorphous opal-A vs. mineral contamination) and x-ray fluorescence (e.g. elemental quantification of clay contamination); then analyzed for [delta]18O values using a step-wise fluorination (SWF) -- CO2 laser heating technique and a Thermo MAT 253 isotope ratio mass spectrometer. Correction methods based on different assumptions place constraints on true diatom [delta]18O values, with margins of error dependent on final sample purity. The results are intermediate between Holocene Antarctic diatom [delta]18O studies, indicating that diatom [delta]18O values can remain largely or entirely unaltered for at least 4.5 Ma. Interpreting these values through the current paleotemperature model, with the contingent paleoenvironmental constraints afforded by AND-1B, suggests water [delta]18O values offset about -10% relative to today's ocean. Stacked benthic foraminifera [delta]18O values for the Pliocene suggest an ocean average less than 1% different than the present; therefore, this points to a strong component of glacial water in a warmer, fresher Pliocene Ross Sea.
Download or read book Paleoclimate Paleoventilation and Paleomagnetism as Recorded in a 17kyr Marine Sediment Record from the SE Alaska Margin written by Maureen Helen Davies and published by . This book was released on 2011 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deglacial behavior of the sub-Arctic North Pacific is poorly constrained, with many published records suffering from limited age control due to extensive post- depositional biogenic carbonate dissolution. Potential alternative dating methods could include the correlation of stable-isotopic and/or paleomagnetic secular variation records to an independently-dated regional template, however no such template currently exists. Cores EW0408-85JC (59°33.32'N, 144°9.21'W, 682 m water depth) and EW0408-79JC (59°33.32'N, 144°9.21'W, 682 m water depth) are located above the carbonate compensation depth on the Gulf of Alaska margin, affording an opportunity to inter- compare stable-isotopic and paleomagnetic variability from a single location, as well as to place observations of Northeast Pacific paleoclimate and paleomagnetic secular variation in a global context via an independent radiocarbon-based chronology. We evaluate three possible age models for core EW0408-85JC and their implications for North Pacific stable isotopic and paleoventilation behavior. These include calibrated planktonic and benthic foraminiferal radiocarbon dates, assuming constant reservoir ages, as well as a correlation of planktonic [delta]18O in foraminifera to [delta]18O in a layer-counted Greenland ice core (NGRIP). We conclude that the calibrated planktonic dates provide the most accurate chronology. Benthic foraminiferal radiocarbon dates evaluated on this age model indicate that intermediate-depth ventilation ages at the site increased to>2,670 ± 180 during Termination 1, implying reduced ventilation relative to the Holocene average of 1,740 ± 210 yr. The shift to lower ventilation ages occurs at ~10,500 cal ybp, coeval with the flooding of Beringia and the opening of the Bering Strait, suggesting that flooded shelves and net export of low- salinity surface waters enhanced ventilation of the North Pacific. Oxygen isotope data from planktonic and benthic foraminifera, interpreted on this age model, document surface freshening by 16,650 ± 170 cal ybp, likely due to freshwater input from retreating regional glaciers. A sharp transition to laminated hemipelagic sedimentation at 14,790 ± 380 cal ybp is coincident with abrupt warming and/or freshening of the surface ocean (i.e. additional [delta]18O reduction of 0.9 [per mil]), essentially coincident with the Bolling Interstade of Northern Europe and Greenland. Cooling and/or higher salinities returned during the Allerod interval, coeval with the Antarctic Cold Reversal and continuing until 11,740 ± 200 cal ybp, when the onset of warming coincides with the end of the Younger Dryas. This may indicate convolved Northern and Southern drivers of climate variability in the North Pacific. Two laminated opal-rich intervals record episodes of high productivity are observed from 14,790 ± 380 to 12,990 ± 190 cal ybp, and from 11,160 ± 130 to 10,750 ± 220 cal ybp. These events likely correlate to similar observations elsewhere on the margins of the North Pacific, and may be driven my remobilization of iron from newly inundated continental shelves during episodes of rapid sea-level rise. High-resolution paleomagnetic secular variation (PSV) records from the Gulf of Alaska constrain regional field behavior and provide information on larger scale geomagnetic dynamics. Both cores studied (EW0408-79JC and 85JC) preserve a generally strong and relatively stable (MAD
Download or read book The Leatherback Turtle written by James R. Spotila and published by JHU Press. This book was released on 2015-10-30 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most comprehensive book ever written on leatherback sea turtles. Weighing as much as 2,000 pounds and reaching lengths of over seven feet, leatherback turtles are the world’s largest reptile. These unusual sea turtles have a thick, pliable shell that helps them to withstand great depths—they can swim more than one thousand meters below the surface in search of food. And what food source sustains these goliaths? Their diet consists almost exclusively of jellyfish, a meal they crisscross the oceans to find. Leatherbacks have been declining in recent decades, and some predict they will be gone by the end of this century. Why? Because of two primary factors: human redevelopment of nesting beaches and commercial fishing. There are only twenty-nine index beaches in the world where these turtles nest, and there is immense pressure to develop most of them into homes or resorts. At the same time, longline and gill net fisheries continue to overwhelm waters frequented by leatherbacks. In The Leatherback Turtle, James R. Spotila and Pilar Santidrián Tomillo bring together the world’s leading experts to produce a volume that reveals the biology of the leatherback while putting a spotlight on the conservation problems and solutions related to the species. The book leaves us with options: embark on the conservation strategy laid out within its pages and save one of nature’s most splendid creations, or watch yet another magnificent species disappear.
Download or read book So Excellent a Fishe written by Archie Carr and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published: New York: Scribner, for the American Museum of Natural History, c1967.
Download or read book Saving Sea Turtles written by James R. Spotila and published by . This book was released on 2011-04-18 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: In April 2007, eleven leatherback turtles captured the imagination of the public worldwide as they “raced” from Costa Rica toward the Galápagos Islands. Known as the Great Turtle Race, this event tracked these critically endangered sea turtles, drawing attention to their fragile status and generating data on the turtles vital to efforts to study and protect them. But the Great Turtle Race is just one of many tools marine conservationists use to inform people about the status, biology, and lives of the seven sea turtle species. Due to human actions, once-plentiful sea turtle population levels plummeted throughout much of the twentieth century, stabilizing somewhat only after Archie Carr and Jacques Cousteau popularized their plight. With Saving Sea Turtles, award-winning author James R. Spotila picks up where Carr and Cousteau left off, going inside the modern-day conservation movement to tell the tales of today’s sea turtle conservationists. He provides a complete overview of sea turtle biology and life cycles, discusses the human and natural world threats they face, and examines the new methods and technologies humans are using to save them. Throughout, Spotila dots the narrative with stories of real-life heroes who risk life and limb to understand, track, and conserve sea turtles across the globe. Spotila has been at the forefront of sea turtle research and conservation for decades. His inspirational story of dedicated individuals, creative endeavors, and adventure reveals what is being done and what else we must do in order to ensure that these fascinating animals continue swimming in the oceans.
Download or read book New Perspectives on Rio Grande Rift Basins From Tectonics to Groundwater written by Mark R. Hudson and published by Geological Society of America. This book was released on 2013-01-01 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Extending from Colorado, USA, on the north to the state of Chihuahua, Mexico, on the south, the Rio Grande rift divides the Colorado Plateau on the west from the interior of the North American craton on the east. This volume focuses on the Rio Grande rift's upper crustal basins and is organized geographically with study areas progressing from north to south. Nineteen chapters cover a variety of topics, including sedimentation history, rift basin geometries and the influence of older structure on rift basin evolution, faulting and strain transfer within and among basins, relations of magmatism to rift tectonism, and basin hydrogeology"--Provided by publisher.
Download or read book Loggerhead Sea Turtles written by Alan B. Bolten and published by National Geographic Books. This book was released on 2022-03-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sea turtles have been the focus of research and intense conservation efforts for decades and the Loggerhead Sea Turtle, currently listed as a threatened species, is arguably one of the best studied of the seven species. Loggerhead Sea Turtles brings together, for the first time, international experts to synthesize the knowledge of Loggerhead biology and conservation and sets the stage for future ecological, biological, and conservation research. Highly detailed coverage includes diet, growth, nesting, migration, habitat selection, and conservation.
Download or read book Marine Red Algae of the Hawaiian Islands written by Isabella Aiona Abbott and published by . This book was released on 1999 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Taxonomy of Economic Seaweeds written by Isabella Aiona Abbott and published by . This book was released on 1988 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wetland Carbon and Environmental Management written by Ken W. Krauss and published by John Wiley & Sons. This book was released on 2021-11-23 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores how the management of wetlands can influence carbon storage and fluxes. Wetlands are vital natural assets, including their ability to take-up atmospheric carbon and restrict subsequent carbon loss to facilitate long-term storage. They can be deliberately managed to provide a natural solution to mitigate climate change, as well as to help offset direct losses of wetlands from various land-use changes and natural drivers. Wetland Carbon and Environmental Management presents a collection of wetland research studies from around the world to demonstrate how environmental management can improve carbon sequestration while enhancing wetland health and function. Volume highlights include: Overview of carbon storage in the landscape Introduction to wetland management practices Comparisons of natural, managed, and converted wetlands Impact of wetland management on carbon storage or loss Techniques for scientific assessment of wetland carbon processes Case studies covering tropical, coastal, inland, and northern wetlands Primer for carbon offset trading programs and how wetlands might contribute The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity.Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.
Download or read book Seaweeds of New Zealand written by Nancy Mary Adams and published by . This book was released on 1994 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large and attractively produced reference book and the only comprehensive book on its subject. Intended for both amateur naturalists and professional botanists. Illustrated with the author's water-colours and including details of microscopic cell structure. The book has an introduction on distribution, ecology, collection and study of seaweeds in New Zealand, full references, glossary and index. The author is a former curator of algae at the (now) Museum of New Zealand.
Download or read book Field Volcanology written by Michael P. Poland and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Don Swanson has adopted a detailed, field-oriented approach to studying problems of great volcanologic importance across a range of compositions and scales. This volume emphasizes the role of field volcanology as a window into better understanding volcanic processes, past and present, and highlights those places and processes where Swanson's insights have been particularly impactful"--
Download or read book Atmospheric Rivers written by F. Martin Ralph and published by Springer Nature. This book was released on 2020-07-10 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the standard reference based on roughly 20 years of research on atmospheric rivers, emphasizing progress made on key research and applications questions and remaining knowledge gaps. The book presents the history of atmospheric-rivers research, the current state of scientific knowledge, tools, and policy-relevant (science-informed) problems that lend themselves to real-world application of the research—and how the topic fits into larger national and global contexts. This book is written by a global team of authors who have conducted and published the majority of critical research on atmospheric rivers over the past years. The book is intended to benefit practitioners in the fields of meteorology, hydrology and related disciplines, including students as well as senior researchers.
