Global Biogeochemical Cycles

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Spatial and seasonal variations of Q10 determined by soil respiration measurements at a Sierra Nevadan Forest
Global Biogeochemical Cycles - Tập 15 Số 3 - Trang 687-696 - 2001
Ming Xu, Ye Qi
We examined the spatial and seasonal variation of Q10 as an indicator of the temperature sensitivity of soil respiration based on field measurements at a young ponderosa pine plantation in the Sierra Nevada Mountains in California. We measured soil CO2 efflux and soil temperature and moisture in two 20 m × 20 m plots from...... hiện toàn bộ
Integration of MODIS land and atmosphere products with a coupled-process model to estimate gross primary productivity and evapotranspiration from 1 km to global scales
Global Biogeochemical Cycles - Tập 25 Số 4 - Trang n/a-n/a - 2011
Youngryel Ryu, Dennis Baldocchi, Hideki Kobayashi, Catharine van Ingen, Jie Li, T. A. Black, Jason Beringer, Eva van Gorsel, Alexander Knohl, B. E. Law, Olivier Roupsard
Challenges of modeling depth‐integrated marine primary productivity over multiple decades: A case study at BATS and HOT
Global Biogeochemical Cycles - Tập 24 Số 3 - 2010
Vincent S. Saba, Marjorie A. M. Friedrichs, Mary‐Elena Carr, David Antoine, Robert A. Armstrong, Ichio Asanuma, Olivier Aumont, Nicholas R. Bates, Michael J. Behrenfeld, Val Bennington, Laurent Bopp, Jorn Bruggeman, Erik T. Buitenhuis, Matthew J. Church, Áurea Maria Ciotti, Scott C. Doney, Mark Dowell, John P. Dunne, Stephanie Dutkiewicz, Watson W. Gregg, Nicolas Hoepffner, Kimberly J.W. Hyde, Joji Ishizaka, Takahiko Kameda, David M. Karl, Ivan D. Lima, Michael W. Lomas, John Marra, Galen A. McKinley, Frédéric Mélin, J. Keith Moore, André Morel, John E. O’Reilly, Barış Salihoğlu, Michele Scardi, Tim Smyth, Shilin Tang, Jerry Tjiputra, Julia Uitz, Marcello Vichi, Kirk Waters, Toby K. Westberry, Andrew Yool
The performance of 36 models (22 ocean color models and 14 biogeochemical ocean circulation models (BOGCMs)) that estimate depth‐integrated marine net primary productivity (NPP) was assessed by comparing their output to in situ 14C data at the Bermuda Atlantic Time series Study (BATS) and the Hawaii Ocean Time series (HOT) over nearly two decades. Specifically, skill w...... hiện toàn bộ
The CAFE model: A net production model for global ocean phytoplankton
Global Biogeochemical Cycles - Tập 30 Số 12 - Trang 1756-1777 - 2016
Greg M. Silsbe, Michael J. Behrenfeld, Kimberly H. Halsey, Allen J. Milligan, Toby K. Westberry
AbstractThe Carbon, Absorption, and Fluorescence Euphotic‐resolving (CAFE) net primary production model is an adaptable framework for advancing global ocean productivity assessments by exploiting state‐of‐the‐art satellite ocean color analyses and addressing key physiological and ecological attributes of phytoplankton. Here we present the first implementation of th...... hiện toàn bộ
Trace elements in the North Atlantic troposphere: Shipboard results of precipitation and aerosols
Global Biogeochemical Cycles - Tập 4 Số 4 - Trang 431-443 - 1990
Thomas M. Church, Alain Véron, Clair C. Patterson, Dorothy M. Settle, Yigal Erel, H. R. Maring, A. Russell Flegal
Samples for trace metals in precipitation (rain, snow, and fog) and total aerosols were collected at sea as part of the GCE/CASE/WATOX expedition during August and September 1988 in the greater North Atlantic between Bermuda, Iceland, the Azores, and Barbados. The samples were collected using ultra‐clean equipment and methods for the analysis of the trace elements Al, Fe, Mn, Zn, Cu, Ni, C...... hiện toàn bộ
Solute Production and Transport Processes in Chinese Monsoonal Rivers: Implications for Global Climate Change
Global Biogeochemical Cycles - Tập 34 Số 9 - 2020
Jun Zhong, Si‐Liang Li, Daniel E. Ibarra, Hu Ding, Cong‐Qiang Liu
AbstractThe negative feedback between chemical weathering and climate is hypothesized to act as an important control on modulating atmospheric CO2 over geologic timescales, affecting the evolution of Earth's climate over the history of Earth. Here, we investigated solute production processes by analyzing concentration‐discharge, denoted here as...... hiện toàn bộ
Holocene atmospheric CO2 increase as viewed from the seafloor
Global Biogeochemical Cycles - Tập 17 Số 2 - 2003
Wallace S. Broecker, Elizabeth Clark
Three scenarios have been proposed to explain the 20‐ppm post‐8000 BP rise in atmospheric CO2 content. Indermühle et al. [1999] call on a climate‐induced decrease in terrestrial biomass. W. F. Ruddiman (personal communication, 2002) calls on an anthropogenically induced decrease in terrestrial biomass. hiện toàn bộ
A global ocean carbon climatology: Results from Global Data Analysis Project (GLODAP)
Global Biogeochemical Cycles - Tập 18 Số 4 - 2004
Robert M. Key, Alex Kozyr, C. Sabine, Kitack Lee, Rik Wanninkhof, John L. Bullister, Richard A. Feely, Frank J. Millero, Calvin W. Mordy, Tianji Peng
During the 1990s, ocean sampling expeditions were carried out as part of the World Ocean Circulation Experiment (WOCE), the Joint Global Ocean Flux Study (JGOFS), and the Ocean Atmosphere Carbon Exchange Study (OACES). Subsequently, a group of U.S. scientists synthesized the data into easily usable and readily available products. This collaboration is known as the Global Ocean Data Analysi...... hiện toàn bộ
Coupled nitrogen and oxygen isotope measurements of nitrate along the eastern North Pacific margin
Global Biogeochemical Cycles - Tập 19 Số 4 - 2005
Daniel M. Sigman, Julie Granger, Peter J. DiFiore, Moritz F. Lehmann, Ruby Ho, Greg Cane, Alexander van Geen
Water column depth profiles along the North Pacific margin from Point Conception to the tip of Baja California indicate elevation of nitrate (NO3−) 15N/14N and 18O/16O associated with denitrification in the oxygen‐deficient thermocline waters of the eastern tropical...... hiện toàn bộ
Mercury isotope compositions across North American forests
Global Biogeochemical Cycles - Tập 30 Số 10 - Trang 1475-1492 - 2016
Wang Zheng, Daniel Obrist, Dominique Weis, Bridget A. Bergquist
AbstractForest biomass and soils represent some of the largest reservoirs of actively cycling mercury (Hg) on Earth, but many uncertainties exist regarding the source and fate of Hg in forest ecosystems. We systematically characterized stable isotope compositions of Hg in foliage, litter, and mineral soil horizons across 10 forest sites in the contiguous United Sta...... hiện toàn bộ
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